releasing version 1.08

[code/myrepos.git] / mr

diff --git a/mr b/mr
index 9a8f750a5406925cbe9afdf60deb808d5cf5097f..23178a5c2bb03e3528aceae6f366fcdeb8f8eb1c 100755 (executable)
--- a/mr
+++ b/mr
@@ -12,18 +12,186 @@ B<mr> [options] update
 
 B<mr> [options] status
 
 
 B<mr> [options] status
 

-B<mr> [options] commit -m "message"
+B<mr> [options] commit [-m "message"]
+
+B<mr> [options] record [-m "message"]
+
+B<mr> [options] push
+
+B<mr> [options] diff
+
+B<mr> [options] log
+
+B<mr> [options] run command [param ...]
+
+B<mr> [options] bootstrap url [directory]
+
+B<mr> [options] register [repository]
+
+B<mr> [options] config section ["parameter=[value]" ...]

 
 B<mr> [options] action [params ...]
 
 
 B<mr> [options] action [params ...]
 

+B<mr> [options] [online|offline]
+
+B<mr> [options] remember action [params ...]
+

 =head1 DESCRIPTION
 
 =head1 DESCRIPTION
 

-B<mr> is a Multiple Repository management tool. It allows you to register a
-set of repositories in a .mrconfig file, and then checkout, update, or
-perform other actions on all of the repositories at once.
+B<mr> is a Multiple Repository management tool. It can checkout, update, or
+perform other actions on a set of repositories as if they were one combined
+repository. It supports any combination of subversion, git, cvs, mercurial,
+bzr, darcs and fossil repositories, and support for other version
+control systems can easily be added.
+
+B<mr> cds into and operates on all registered repositories at or below your
+working directory. Or, if you are in a subdirectory of a repository that
+contains no other registered repositories, it will stay in that directory,
+and work on only that repository,
+
+B<mr> is configured by .mrconfig files, which list the repositories. It
+starts by reading the .mrconfig file in your home directory, and this can
+in turn chain load .mrconfig files from repositories. It also automatically
+looks for a .mrconfig file in the current directory, or in one of its
+parent directories.
+
+These predefined commands should be fairly familiar to users of any version
+control system:
+
+=over 4
+
+=item checkout (or co)
+
+Checks out any repositories that are not already checked out.
+
+=item update
+
+Updates each repository from its configured remote repository.
+
+If a repository isn't checked out yet, it will first check it out.
+
+=item status
+
+Displays a status report for each repository, showing what
+uncommitted changes are present in the repository.
+
+=item commit (or ci)
+
+Commits changes to each repository. (By default, changes are pushed to the
+remote repository too, when using distributed systems like git. If you
+don't like this default, you can change it in your .mrconfig, or use record
+instead.)
+
+The optional -m parameter allows specifying a commit message.
+
+=item record
+
+Records changes to the local repository, but does not push them to the
+remote repository. Only supported for distributed version control systems.
+
+The optional -m parameter allows specifying a commit message.
+
+=item push
+
+Pushes committed local changes to the remote repository. A no-op for
+centralized version control systems.
+
+=item diff
+
+Show a diff of uncommitted changes.
+
+=item log
+
+Show the commit log.
+
+=item run command [param ...]
+
+Runs the specified command in each repository.
+
+=back
+
+These commands are also available:
+
+=over 4
+
+=item bootstrap url [directory]

 
 

-Any mix of revision control systems can be used with B<mr>, and you can
-define arbitrary actions like "update", "checkout", or "commit".
+Causes mr to download the url, and use it as a .mrconfig file
+to checkout the repositories listed in it, into the specified directory.
+
+The directory will be created if it does not exist. If no directory is
+specified, the current directory will be used.
+
+If the .mrconfig file includes a repository named ".", that
+is checked out into the top of the specified directory.
+
+=item list (or ls)
+
+List the repositories that mr will act on.
+
+=item register
+
+Register an existing repository in a mrconfig file. By default, the
+repository in the current directory is registered, or you can specify a
+directory to register.
+
+The mrconfig file that is modified is chosen by either the -c option, or by
+looking for the closest known one at or in a parent of the current directory.
+
+=item config
+
+Adds, modifies, removes, or prints a value from a mrconfig file. The next
+parameter is the name of the section the value is in. To add or modify
+values, use one or more instances of "parameter=value". Use "parameter=" to
+remove a parameter. Use just "parameter" to get the value of a parameter.
+
+For example, to add (or edit) a repository in src/foo:
+
+  mr config src/foo checkout="svn co svn://example.com/foo/trunk foo"
+
+To show the command that mr uses to update the repository in src/foo:
+
+  mr config src/foo update
+
+To see the built-in library of shell functions contained in mr:
+
+  mr config DEFAULT lib
+
+The mrconfig file that is used is chosen by either the -c option, or by
+looking for the closest known one at or in a parent of the current directory.
+
+=item offline
+
+Advises mr that it is in offline mode. Any commands that fail in
+offline mode will be remembered, and retried when mr is told it's online.
+
+=item online
+
+Advices mr that it is in online mode again. Commands that failed while in
+offline mode will be re-run.
+
+=item remember
+
+Remember a command, to be run later when mr re-enters online mode. This
+implicitly puts mr into offline mode. The command can be any regular mr
+command. This is useful when you know that a command will fail due to being
+offline, and so don't want to run it right now at all, but just remember
+to run it when you go back online.
+
+=item help
+
+Displays this help.
+
+=back
+
+Actions can be abbreviated to any unambiguous substring, so
+"mr st" is equivalent to "mr status", and "mr up" is equivalent to "mr
+update"
+
+Additional parameters can be passed to most commands, and are passed on
+unchanged to the underlying version control system. This is mostly useful
+if the repositories mr will act on all use the same version control
+system.

 
 =head1 OPTIONS
 
 
 =head1 OPTIONS
 


@@ -31,280 +199,1873 @@ define arbitrary actions like "update", "checkout", or "commit".
 
 =item -d directory
 
 
 =item -d directory
 

+=item --directory directory
+

 Specifies the topmost directory that B<mr> should work in. The default is
 Specifies the topmost directory that B<mr> should work in. The default is

-the current working directory. B<mr> will operate on all registered
-repositories at or under the directory.
+the current working directory.

 
 =item -c mrconfig
 
 
 =item -c mrconfig
 

-Use the specified mrconfig file, instead of looking for on in your home
-directory.
+=item --config mrconfig
+
+Use the specified mrconfig file. The default is to use both F<~/.mrconfig>
+as well as look for a F<.mrconfig> file in the current directory, or in one
+of its parent directories.
+
+=item -f
+
+=item --force
+
+Force mr to act on repositories that would normally be skipped due to their
+configuration.

 
 =item -v
 
 
 =item -v
 

+=item --verbose
+

 Be verbose.
 
 Be verbose.
 

+=item -q
+
+=item --quiet
+
+Be quiet. This suppresses mr's usual output, as well as any output from
+commands that are run (including stderr output). If a command fails,
+the output will be shown.
+
+=item -k
+
+=item --insecure
+
+Accept untrusted SSL certificates when bootstrapping.
+
+=item -s
+
+=item --stats
+
+Expand the statistics line displayed at the end to include information
+about exactly which repositories failed and were skipped, if any.
+
+=item -i
+
+=item --interactive
+
+Interactive mode. If a repository fails to be processed, a subshell will be
+started which you can use to resolve or investigate the problem. Exit the
+subshell to continue the mr run.
+
+=item -n [number]
+
+=item --no-recurse [number]
+
+If no number if specified, just operate on the repository for the current
+directory, do not recurse into deeper repositories.
+
+If a number is specified, will recurse into repositories at most that many
+subdirectories deep. For example, with -n 2 it would recurse into ./src/foo,
+but not ./src/packages/bar.
+
+=item -j [number]
+
+=item --jobs [number]
+
+Run the specified number of jobs in parallel, or an unlimited number of jobs
+with no number specified. This can greatly speed up operations such as updates.
+It is not recommended for interactive operations.
+
+Note that running more than 10 jobs at a time is likely to run afoul of
+ssh connection limits. Running between 3 and 5 jobs at a time will yield
+a good speedup in updates without loading the machine too much.
+
+=item -t
+
+=item --trust-all
+
+Trust all mrconfig files even if they are not listed in F<~/.mrtrust>.
+Use with caution.
+
+=item -p
+
+=item --path
+
+This obsolete flag is ignored.
+

 =back
 
 =back
 

-=head1 FILES
+=head1 MRCONFIG FILES
+
+Here is an example F<.mrconfig> file:
+
+  [src]
+  checkout = svn checkout svn://svn.example.com/src/trunk src
+  chain = true
+
+  [src/linux-2.6]
+  checkout = git clone git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git &&
+       cd linux-2.6 &&
+       git checkout -b mybranch origin/master

 
 

-B<mr> is configured by .mrconfig files. It searches for .mrconfig files in
-your home directory, and in the root directory of each repository specified
-in a .mrconfig file. So you could have a ~/.mrconfig that registers a
-repository ~/src, that itself contains a ~/src/.mrconfig file, that in turn
-registers several additional repositories.
+The F<.mrconfig> file uses a variant of the INI file format. Lines
+starting with "#" are comments. Values can be continued to the
+following line by indenting the line with whitespace.

 
 

-The .mrconfig file uses a variant of the INI file format. Lines starting with
-"#" are comments. Lines ending with "\" are continued on to the next line.
-Sections specify where each repository is located, relative to the
-directory that contains the .mrconfig file.
+The C<DEFAULT> section allows setting default values for the sections that
+come after it.
+
+The C<ALIAS> section allows adding aliases for actions. Each parameter
+is an alias, and its value is the action to use.
+
+All other sections add repositories. The section header specifies the
+directory where the repository is located. This is relative to the directory
+that contains the mrconfig file, but you can also choose to use absolute
+paths. (Note that you can use environment variables in section names; they
+will be passed through the shell for expansion. For example, 
+C<[$HOSTNAME]>, or C<[${HOSTNAME}foo]>).

 
 Within a section, each parameter defines a shell command to run to handle a
 
 Within a section, each parameter defines a shell command to run to handle a

-given action. Note that these shell commands are run in a "set -e" shell
-environment, and B<mr> cds into the repository directory before running
-them, except for the "checkout" command, which is run in the parent of the
-repository directory, since the repository isn't checked out yet.
+given action. mr contains default handlers for "update", "status",
+"commit", and other standard actions.
+
+Normally you only need to specify what to do for "checkout". Here you
+specify the command to run in order to create a checkout of the repository.
+The command will be run in the parent directory, and must create the
+repository's directory. So use C<git clone>, C<svn checkout>, C<bzr branch>
+or C<bzr checkout> (for a bound branch), etc.
+
+Note that these shell commands are run in a C<set -e> shell
+environment, where any additional parameters you pass are available in
+C<$@>. All commands other than "checkout" are run inside the repository,
+though not necessarily at the top of it.
+
+The C<MR_REPO> environment variable is set to the path to the top of the
+repository. (For the "register" action, "MR_REPO" is instead set to the 
+basename of the directory that should be created when checking the
+repository out.)
+
+The C<MR_CONFIG> environment variable is set to the .mrconfig file
+that defines the repo being acted on, or, if the repo is not yet in a config
+file, the F<.mrconfig> file that should be modified to register the repo.
+
+The C<MR_ACTION> environment variable is set to the command being run
+(update, checkout, etc).
+
+A few parameters have special meanings:
+
+=over 4
+
+=item skip
+
+If the "skip" parameter is set and its command returns true, then B<mr>
+will skip acting on that repository. The command is passed the action
+name in C<$1>.
+
+Here are two examples. The first skips the repo unless
+mr is run by joey. The second uses the hours_since function
+(included in mr's built-in library) to skip updating the repo unless it's
+been at least 12 hours since the last update.
+
+  [mystuff]
+  checkout = ...
+  skip = test `whoami` != joey
+
+  [linux]
+  checkout = ...
+  skip = [ "$1" = update ] && ! hours_since "$1" 12
+ 
+Another way to use skip is for a lazy checkout. This makes mr skip
+operating on a repo unless it already exists. To enable the 
+repo, you have to explicitly check it out (using "mr --force -d foo checkout").
+
+  [foo]
+  checkout = ...
+  skip = lazy
+
+=item order
+
+The "order" parameter can be used to override the default ordering of
+repositories. The default order value is 10. Use smaller values to make
+repositories be processed earlier, and larger values to make repositories
+be processed later.
+
+Note that if a repository is located in a subdirectory of another
+repository, ordering it to be processed earlier is not recommended.
+
+=item chain
+
+If the "chain" parameter is set and its command returns true, then B<mr>
+will try to load a F<.mrconfig> file from the root of the repository.
+
+=item include
+
+If the "include" parameter is set, its command is ran, and should output
+additional mrconfig file content. The content is included as if it were
+part of the including file.
+
+Unlike all other parameters, this parameter does not need to be placed
+within a section.
+
+B<mr> ships several libraries that can be included to add support for
+additional version control type things (unison, git-svn, vcsh, git-fake-bare,
+git-subtree). To include them all, you could use:
+
+  include = cat /usr/share/mr/*
+
+See the individual files for details.
+
+=item deleted
+
+If the "deleted" parameter is set and its command returns true, then
+B<mr> will treat the repository as deleted. It won't ever actually delete
+the repository, but it will warn if it sees the repository's directory.
+This is useful when one mrconfig file is shared among multiple machines,
+to keep track of and remember to delete old repositories.
+
+=item lib
+
+The "lib" parameter can specify some shell code that will be run
+before each command, this can be a useful way to define shell
+functions for other commands to use. 
+
+Unlike most other parameters, this can be specified multiple times, in
+which case the chunks of shell code are accumulatively concatenated
+together.
+
+=item fixups
+
+If the "fixups" parameter is set, its command is run whenever a repository
+is checked out, or updated. This provides an easy way to do things
+like permissions fixups, or other tweaks to the repository content,
+whenever the repository is changed.
+
+=item VCS_action
+
+When looking for a command to run for a given action, mr first looks for
+a parameter with the same name as the action. If that is not found, it
+looks for a parameter named "VCS_action" (substituting in the name of the
+version control system and the action).
+
+Internally, mr has settings for "git_update", "svn_update", etc. To change
+the action that is performed for a given version control system, you can
+override these VCS specific actions. To add a new version control system,
+you can just add VCS specific actions for it.
+
+=item pre_ and post_
+
+If a "pre_action" parameter is set, its command is run before mr performs the
+specified action. Similarly, "post_action" parameters are run after mr
+successfully performs the specified action. For example, "pre_commit" is
+run before committing; "post_update" is run after updating.
+
+=item _append
+
+Any parameter can be suffixed with C<_append>, to add an additional value
+to the existing value of the parameter. In this way, actions 
+can be constructed accumulatively.
+
+=item VCS_test
+
+The name of the version control system is itself determined by
+running each defined "VCS_test" action, until one succeeds.
+
+=item VCS_dir_test
+
+This is a more optimised way to test for the version control system.
+Each "VCS_dir_test" action is run once, and can output lines consisting
+of the name of a VCS, and a directory to look for in the top of a repo
+to detect that VCS.
+
+=back
+
+=head1 UNTRUSTED MRCONFIG FILES
+
+Since mrconfig files can contain arbitrary shell commands, they can do
+anything. This flexibility is good, but it also allows a malicious mrconfig
+file to delete your whole home directory. Such a file might be contained
+inside a repository that your main F<~/.mrconfig> checks out. To
+avoid worries about evil commands in a mrconfig file, mr defaults to
+reading all mrconfig files other than the main F<~/.mrconfig> in untrusted
+mode. In untrusted mode, mrconfig files are limited to running only known
+safe commands (like "git clone") in a carefully checked manner.
+
+To configure mr to trust other mrconfig files, list them in F<~/.mrtrust>.
+One mrconfig file should be listed per line. Either the full pathname
+should be listed, or the pathname can start with F<~/> to specify a file
+relative to your home directory.
+
+=head1 OFFLINE LOG FILE
+
+The F<~/.mrlog> file contains commands that mr has remembered to run later,
+due to being offline. You can delete or edit this file to remove commands,
+or even to add other commands for 'mr online' to run. If the file is
+present, mr assumes it is in offline mode.
+
+=head1 EXTENSIONS
+
+mr can be extended to support things such as unison and git-svn. Some
+files providing such extensions are available in F</usr/share/mr/>. See
+the documentation in the files for details about using them.
+
+=head1 EXIT STATUS
+
+mr returns nonzero if a command failed in any of the repositories.
+
+=head1 AUTHOR
+
+Copyright 2007-2011 Joey Hess <joey@kitenet.net>

 
 

-There are two special parameters. If the "skip" parameter is set and
-its command returns nonzero, then B<mr> will skip acting on that repository.
+Licensed under the GNU GPL version 2 or higher.
+
+http://kitenet.net/~joey/code/mr/
+
+=cut
+
+use warnings;
+use strict;
+use Getopt::Long;
+use Cwd qw(getcwd abs_path);
+
+# things that can happen when mr runs a command
+use constant {
+       OK => 0,
+       FAILED => 1,
+       SKIPPED => 2,
+       ABORT => 3,
+};
+
+# configurables
+my $config_overridden=0;
+my $verbose=0;
+my $quiet=0;
+my $stats=0;
+my $force=0;
+my $insecure=0;
+my $interactive=0;
+my $max_depth;
+my $no_chdir=0;
+my $jobs=1;
+my $trust_all=0;
+my $directory=getcwd();
+
+my $HOME_MR_CONFIG = "$ENV{HOME}/.mrconfig";
+$ENV{MR_CONFIG}=find_mrconfig();
+
+# globals :-(
+my %config;
+my %configfiles;
+my %knownactions;
+my %alias;
+my (@ok, @failed, @skipped);
+
+main();
+
+sub shellquote {
+       my $i=shift;
+       $i=~s/'/'"'"'/g;
+       return "'$i'";
+}
+
+# Runs a shell command using a supplied function.
+# The lib will be included in the shell command line, and any params
+# will be available in the shell as $1, $2, etc.
+my $lastlib;
+sub runsh {
+       my ($action, $topdir, $subdir, $command, $params, $runner) = @_;
+
+       # optimisation: avoid running the shell for true and false
+       if ($command =~ /^\s*true\s*$/) {
+               $?=0;
+               return 0;
+       }
+       elsif ($command =~ /^\s*false\s*$/) {
+               $?=0;
+               return 1;
+       }
+       
+       my $quotedparams=join(" ", (map { shellquote($_) } @$params));
+       my $lib=exists $config{$topdir}{$subdir}{lib} ?
+                      $config{$topdir}{$subdir}{lib}."\n" : "";
+       if ($verbose && (! defined $lastlib || $lastlib ne $lib)) {
+               print "mr library now: >>$lib<<\n";
+               $lastlib=$lib;
+       }
+       my $shellcode="set -e;".$lib.
+               "my_sh(){ $command\n }; my_sh $quotedparams";
+       print "mr $action: running $action >>$command<<\n" if $verbose;
+       $runner->($shellcode);
+}
+
+sub runshpipe {
+       runsh @_, sub {
+               my $sh=shift;
+               my $ret=`$sh`;
+               chomp $ret;
+               return $ret;
+       };
+}
+
+my %vcs;
+my %vcs_dir_test;
+sub vcs_test {
+       my ($action, $dir, $topdir, $subdir) = @_;
+
+       if (exists $vcs{$dir}) {
+               return $vcs{$dir};
+       }
+
+       my $test="";
+       my $dir_test="";
+       foreach my $vcs_test (
+                       sort {
+                               length $a <=> length $b 
+                                         ||
+                                      $a cmp $b
+                       } grep { /_test$/ } keys %{$config{$topdir}{$subdir}}) {
+               if ($vcs_test =~ /(.*)_dir_test/) {
+                       my $vcs=$1;
+                       if (! defined $vcs_dir_test{$vcs}) {
+                               $dir_test.=$config{$topdir}{$subdir}{$vcs_test}."\n";
+                       }
+                       next;
+               }
+               my ($vcs)=$vcs_test =~ /(.*)_test/;
+               $test="my_$vcs_test() {\n$config{$topdir}{$subdir}{$vcs_test}\n}\n".$test;
+               $test.="if my_$vcs_test; then echo $vcs; fi\n";
+       }
+
+       if (length $dir_test) {
+               runsh "vcs dir test", $topdir, $subdir, $dir_test, [], sub {
+                       my $sh=shift;
+                       foreach my $line (`$sh`) {
+                               chomp $line;
+                               my ($vcs, $dir)=split(" ", $line);
+                               $vcs_dir_test{$vcs}=$dir;
+                       }
+               }
+       }
+
+       foreach my $vcs (keys %vcs_dir_test) {
+               if (-d "$ENV{MR_REPO}/$vcs_dir_test{$vcs}") {
+                       return $vcs{$dir}=$vcs;
+               }
+       }
+
+       my $vcs=runshpipe "vcs test", $topdir, $subdir, $test, [];
+       if ($vcs=~/\n/s) {
+               $vcs=~s/\n/, /g;
+               print STDERR "mr $action: found multiple possible repository types ($vcs) for ".fulldir($topdir, $subdir)."\n";
+               return undef;
+       }
+       if (! length $vcs) {
+               return $vcs{$dir}=undef;
+       }
+       else {
+               return $vcs{$dir}=$vcs;
+       }
+}
+       
+sub findcommand {
+       my ($action, $dir, $topdir, $subdir, $is_checkout) = @_;
+       
+       if (exists $config{$topdir}{$subdir}{$action}) {
+               return $config{$topdir}{$subdir}{$action};
+       }
+
+       if ($is_checkout) {
+               return undef;
+       }
+
+       my $vcs=vcs_test(@_);
+
+       if (defined $vcs && 
+           exists $config{$topdir}{$subdir}{$vcs."_".$action}) {
+               return $config{$topdir}{$subdir}{$vcs."_".$action};
+       }
+       else {
+               return undef;
+       }
+}
+
+sub fulldir {
+       my ($topdir, $subdir) = @_;
+       return $subdir =~ /^\// ? $subdir : $topdir.$subdir;
+}
+
+sub action {
+       my ($action, $dir, $topdir, $subdir, $force_checkout) = @_;
+       my $fulldir=fulldir($topdir, $subdir);
+
+       $ENV{MR_CONFIG}=$configfiles{$topdir};
+       my $is_checkout=($action eq 'checkout');
+       my $is_update=($action =~ /update/);
+
+       ($ENV{MR_REPO}=$dir) =~ s!/$!!;
+       $ENV{MR_ACTION}=$action;
+       
+       foreach my $testname ("skip", "deleted") {
+               next if $force && $testname eq "skip";
+
+               my $testcommand=findcommand($testname, $dir, $topdir, $subdir, $is_checkout);
+
+               if (defined $testcommand) {
+                       my $ret=runsh "$testname test", $topdir, $subdir,
+                               $testcommand, [$action],
+                               sub { system(shift()) };
+                       if ($ret != 0) {
+                               if (($? & 127) == 2) {
+                                       print STDERR "mr $action: interrupted\n";
+                                       return ABORT;
+                               }
+                               elsif ($? & 127) {
+                                       print STDERR "mr $action: $testname test received signal ".($? & 127)."\n";
+                                       return ABORT;
+                               }
+                       }
+                       if ($ret >> 8 == 0) {
+                               if ($testname eq "deleted") {
+                                       if (-d $dir) {
+                                               print STDERR "mr error: $dir should be deleted yet still exists\n";
+                                               return FAILED;
+                                       }
+                               }
+                               print "mr $action: skip $dir skipped\n" if $verbose;
+                               return SKIPPED;
+                       }
+               }
+       }
+
+       if ($is_checkout) {
+               if (! $force_checkout) {
+                       if (-d $dir) {
+                               print "mr $action: $dir already exists, skipping checkout\n" if $verbose;
+                               return SKIPPED;
+                       }
+       
+                       $dir=~s/^(.*)\/[^\/]+\/?$/$1/;
+               }
+       }
+       elsif ($is_update) {
+               if (! -d $dir) {
+                       return action("checkout", $dir, $topdir, $subdir);
+               }
+       }
+
+       my $command=findcommand($action, $dir, $topdir, $subdir, $is_checkout);
+
+       if ($is_checkout && ! -d $dir) {
+               print "mr $action: creating parent directory $dir\n" if $verbose;
+               system("mkdir", "-p", $dir);
+       }
+
+       if (! $no_chdir && ! chdir($dir)) {
+               print STDERR "mr $action: failed to chdir to $dir: $!\n";
+               return FAILED;
+       }
+       elsif (! defined $command) {
+               my $vcs=vcs_test(@_);
+               if (! defined $vcs) {
+                       print STDERR "mr $action: unknown repository type and no defined $action command for $fulldir\n";
+                       return FAILED;
+               }
+               else {
+                       print STDERR "mr $action: no defined action for $vcs repository $fulldir, skipping\n";
+                       return SKIPPED;
+               }
+       }
+       else {
+               my $actionmsg;
+               if (! $no_chdir) {
+                       $actionmsg="mr $action: $fulldir";
+               }
+               else {
+                       my $s=$directory;
+                       $s=~s/^\Q$fulldir\E\/?//;
+                       $actionmsg="mr $action: $fulldir (in subdir $s)";
+               }
+               print "$actionmsg\n" unless $quiet;
+
+               my $hookret=hook("pre_$action", $topdir, $subdir);
+               return $hookret if $hookret != OK;
+
+               my $ret=runsh $action, $topdir, $subdir,
+                       $command, \@ARGV, sub {
+                               my $sh=shift;
+                               if ($quiet) {
+                                       my $output = qx/$sh 2>&1/;
+                                       my $ret = $?;
+                                       if ($ret != 0) {
+                                               print "$actionmsg\n";
+                                               print STDERR $output;
+                                       }
+                                       return $ret;
+                               }
+                               else {
+                                       system($sh);
+                               }
+                       };
+               if ($ret != 0) {
+                       if (($? & 127) == 2) {
+                               print STDERR "mr $action: interrupted\n";
+                               return ABORT;
+                       }
+                       elsif ($? & 127) {
+                               print STDERR "mr $action: received signal ".($? & 127)."\n";
+                               return ABORT;
+                       }
+                       print STDERR "mr $action: failed ($ret)\n" if $verbose;
+                       if ($ret >> 8 != 0) {
+                               print STDERR "mr $action: command failed\n";
+                               if (-e "$ENV{HOME}/.mrlog" && $action ne 'remember') {
+                                       # recreate original command line to
+                                       # remember, and avoid recursing
+                                       my @orig=@ARGV;
+                                       @ARGV=('-n', $action, @orig);
+                                       action("remember", $dir, $topdir, $subdir);
+                                       @ARGV=@orig;
+                               }
+                       }
+                       elsif ($ret != 0) {
+                               print STDERR "mr $action: command died ($ret)\n";
+                       }
+                       return FAILED;
+               }
+               else {
+                       if ($is_checkout && ! -d $dir) {
+                               print STDERR "mr $action: $dir missing after checkout\n";;
+                               return FAILED;
+                       }
+
+                       my $ret=hook("post_$action", $topdir, $subdir);
+                       return $ret if $ret != OK;
+                       
+                       if (($is_checkout || $is_update)) {
+                               my $ret=hook("fixups", $topdir, $subdir);
+                               return $ret if $ret != OK;
+                       }
+                       
+                       return OK;
+               }
+       }
+}
+
+sub hook {
+       my ($hook, $topdir, $subdir) = @_;
+
+       my $command=$config{$topdir}{$subdir}{$hook};
+       return OK unless defined $command;
+       my $ret=runsh $hook, $topdir, $subdir, $command, [], sub {
+                       my $sh=shift;
+                       if ($quiet) {
+                               my $output = qx/$sh 2>&1/;
+                               my $ret = $?;
+                               if ($ret != 0) {
+                                       print STDERR $output;
+                               }
+                               return $ret;
+                       }
+                       else {
+                               system($sh);
+                       }
+               };
+       if ($ret != 0) {
+               if (($? & 127) == 2) {
+                       print STDERR "mr $hook: interrupted\n";
+                       return ABORT;
+               }
+               elsif ($? & 127) {
+                       print STDERR "mr $hook: received signal ".($? & 127)."\n";
+                       return ABORT;
+               }
+               else {
+                       return FAILED;
+               }
+       }
+
+       return OK;
+}
+
+# run actions on multiple repos, in parallel
+sub mrs {
+       my $action=shift;
+       my @repos=@_;
+
+       $| = 1;
+       my @active;
+       my @fhs;
+       my @out;
+       my $running=0;
+       while (@fhs or @repos) {
+               while ((!$jobs || $running < $jobs) && @repos) {
+                       $running++;
+                       my $repo = shift @repos;
+                       pipe(my $outfh, CHILD_STDOUT);
+                       pipe(my $errfh, CHILD_STDERR);
+                       my $pid;
+                       unless ($pid = fork) {
+                               die "mr $action: cannot fork: $!" unless defined $pid;
+                               open(STDOUT, ">&CHILD_STDOUT") || die "mr $action cannot reopen stdout: $!";
+                               open(STDERR, ">&CHILD_STDERR") || die "mr $action cannot reopen stderr: $!";
+                               close CHILD_STDOUT;
+                               close CHILD_STDERR;
+                               close $outfh;
+                               close $errfh;
+                               exit action($action, @$repo);
+                       }
+                       close CHILD_STDOUT;
+                       close CHILD_STDERR;
+                       push @active, [$pid, $repo];
+                       push @fhs, [$outfh, $errfh];
+                       push @out, ['',     ''];
+               }
+               my ($rin, $rout) = ('','');
+               my $nfound;
+               foreach my $fh (@fhs) {
+                       next unless defined $fh;
+                       vec($rin, fileno($fh->[0]), 1) = 1 if defined $fh->[0];
+                       vec($rin, fileno($fh->[1]), 1) = 1 if defined $fh->[1];
+               }
+               $nfound = select($rout=$rin, undef, undef, 1);
+               foreach my $channel (0, 1) {
+                       foreach my $i (0..$#fhs) {
+                               next unless defined $fhs[$i];
+                               my $fh = $fhs[$i][$channel];
+                               next unless defined $fh;
+                               if (vec($rout, fileno($fh), 1) == 1) {
+                                       my $r = '';
+                                       if (sysread($fh, $r, 1024) == 0) {
+                                               close($fh);
+                                               $fhs[$i][$channel] = undef;
+                                               if (! defined $fhs[$i][0] &&
+                                                   ! defined $fhs[$i][1]) {
+                                                       waitpid($active[$i][0], 0);
+                                                       print STDOUT $out[$i][0];
+                                                       print STDERR $out[$i][1];
+                                                       record($active[$i][1], $? >> 8);
+                                                       splice(@fhs, $i, 1);
+                                                       splice(@active, $i, 1);
+                                                       splice(@out, $i, 1);
+                                                       $running--;
+                                               }
+                                       }
+                                       $out[$i][$channel] .= $r;
+                               }
+                       }
+               }
+       }
+}
+
+sub record {
+       my $dir=shift()->[0];
+       my $ret=shift;
+
+       if ($ret == OK) {
+               push @ok, $dir;
+               print "\n" unless $quiet;
+       }
+       elsif ($ret == FAILED) {
+               if ($interactive) {
+                       chdir($dir) unless $no_chdir;
+                       print STDERR "mr: Starting interactive shell. Exit shell to continue.\n";
+                       system((getpwuid($<))[8], "-i");
+               }
+               push @failed, $dir;
+               print "\n" unless $quiet;
+       }
+       elsif ($ret == SKIPPED) {
+               push @skipped, $dir;
+       }
+       elsif ($ret == ABORT) {
+               exit 1;
+       }
+       else {
+               die "unknown exit status $ret";
+       }
+}
+
+sub showstats {
+       my $action=shift;
+       if (! @ok && ! @failed && ! @skipped) {
+               die "mr $action: no repositories found to work on\n";
+       }
+       print "mr $action: finished (".join("; ",
+               showstat($#ok+1, "ok", "ok"),
+               showstat($#failed+1, "failed", "failed"),
+               showstat($#skipped+1, "skipped", "skipped"),
+       ).")\n" unless $quiet;
+       if ($stats) {
+               if (@skipped) {
+                       print "mr $action: (skipped: ".join(" ", @skipped).")\n" unless $quiet;
+               }
+               if (@failed) {
+                       print STDERR "mr $action: (failed: ".join(" ", @failed).")\n";
+               }
+       }
+}
+
+sub showstat {
+       my $count=shift;
+       my $singular=shift;
+       my $plural=shift;
+       if ($count) {
+               return "$count ".($count > 1 ? $plural : $singular);
+       }
+       return;
+}
+
+# an ordered list of repos
+sub repolist {
+       my @list;
+       foreach my $topdir (sort keys %config) {
+               foreach my $subdir (sort keys %{$config{$topdir}}) {
+                       push @list, {
+                               topdir => $topdir,
+                               subdir => $subdir,
+                               order => $config{$topdir}{$subdir}{order},
+                       };
+               }
+       }
+       return sort {
+               $a->{order}  <=> $b->{order}
+                            ||
+               $a->{topdir} cmp $b->{topdir}
+                            ||
+               $a->{subdir} cmp $b->{subdir}
+       } @list;
+}
+
+sub repodir {
+       my $repo=shift;
+       my $topdir=$repo->{topdir};
+       my $subdir=$repo->{subdir};
+       my $ret=($subdir =~/^\//) ? $subdir : $topdir.$subdir;
+       $ret=~s/\/\.$//;
+       return $ret;
+}

 
 

-The "default" section allows setting up default handlers for each action,
-and is overridden by the contents of other sections. mr contains default
-handlers for the "update", "status", and "commit" actions, so normally
-you only need to specify what to do for "checkout".
+# Figure out which repos to act on.  Returns a list of array refs
+# in the format:
+#
+#   [ "$full_repo_path/", "$mr_config_path/", $section_header ]
+sub selectrepos {
+       my @repos;
+       foreach my $repo (repolist()) {
+               my $topdir=$repo->{topdir};
+               my $subdir=$repo->{subdir};

 
 

-For example:
+               next if $subdir eq 'DEFAULT';
+               my $dir=repodir($repo);
+               my $d=$directory;
+               $dir.="/" unless $dir=~/\/$/;
+               $d.="/" unless $d=~/\/$/;
+               next if $dir ne $d && $dir !~ /^\Q$d\E/;
+               if (defined $max_depth) {
+                       my @a=split('/', $dir);
+                       my @b=split('/', $d);
+                       do { } while (@a && @b && shift(@a) eq shift(@b));
+                       next if @a > $max_depth || @b > $max_depth;
+               }
+               push @repos, [$dir, $topdir, $subdir];
+       }
+       if (! @repos) {
+               # fallback to find a leaf repo
+               foreach my $repo (reverse repolist()) {
+                       my $topdir=$repo->{topdir};
+                       my $subdir=$repo->{subdir};
+                       
+                       next if $subdir eq 'DEFAULT';
+                       my $dir=repodir($repo);
+                       my $d=$directory;
+                       $dir.="/" unless $dir=~/\/$/;
+                       $d.="/" unless $d=~/\/$/;
+                       if ($d=~/^\Q$dir\E/) {
+                               push @repos, [$dir, $topdir, $subdir];
+                               last;
+                       }
+               }
+               $no_chdir=1;
+       }
+       return @repos;
+}

 
 

-  [src]
-  checkout = svn co svn://svn.example.com/src/trunk src
+sub expandenv {
+       my $val=shift;
+       

 
 

-  [src/linux-2.6]
-  # only check this out on kodama
-  skip = test $(hostname) != kodama
-  checkout = git clone git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
+       if ($val=~/\$/) {
+               $val=`echo "$val"`;
+               chomp $val;
+       }
+       
+       return $val;
+}

 
 

-=head1 AUTHOR
+my %trusted;
+sub is_trusted_config {
+       my $config=shift; # must be abs_pathed already

 
 

-Copyright 2007 Joey Hess <joey@kitenet.net>
+       # We always trust ~/.mrconfig.
+       return 1 if $config eq abs_path($HOME_MR_CONFIG);

 
 

-Licensed under the GNU GPL version 2 or higher.
+       return 1 if $trust_all;

 
 

-http://kitenet.net/~joey/code/mr/
+       my $trustfile=$ENV{HOME}."/.mrtrust";

 
 

-=cut
+       if (! %trusted) {
+               $trusted{$HOME_MR_CONFIG}=1;
+               if (open (TRUST, "<", $trustfile)) {
+                       while (<TRUST>) {
+                               chomp;
+                               s/^~\//$ENV{HOME}\//;
+                               $trusted{abs_path($_)}=1;
+                       }
+                       close TRUST;
+               }
+       }

 
 

-use warnings;
-use strict;
-use Getopt::Long;
-use Cwd qw(getcwd abs_path);
+       return $trusted{$config};
+}

 
 

-my $directory=getcwd();
-my $config="$ENV{HOME}/.mrconfig";
-my $verbose=0;
-my %config;

 
 

-Getopt::Long::Configure("no_permute");
-my $result=GetOptions(
-       "d=s" => sub { $directory=abs_path($_[1]) },
-       "c=s" => \$config,
-       "v" => \$verbose,
-);
-if (! $result || @ARGV < 1) {
-       die("Usage: mr [-d directory] action [params ...]\n");
-}
-my $action=shift @ARGV;
-
-loadconfig(\*DATA);
-loadconfig($config);
-#use Data::Dumper;
-#print Dumper(\%config);
-
-my (@failures, @successes, @skipped);
-my $first=1;
-foreach my $topdir (sort keys %config) {
-       foreach my $subdir (sort keys %{$config{$topdir}}) {
-               next if $subdir eq 'default';
-               
-               my $dir=$topdir.$subdir;
+sub is_trusted_repo {
+       my $repo=shift;
+       
+       # Tightly limit what is allowed in a repo name.
+       # No ../, no absolute paths, and no unusual filenames
+       # that might try to escape to the shell.
+       return $repo =~ /^[-_.+\/A-Za-z0-9]+$/ &&
+              $repo !~ /\.\./ && $repo !~ /^\//;
+}

 
 

-               if (defined $directory &&
-                   $dir !~ /^\Q$directory\E\//) {
-                       print "mr $action: $dir skipped per -d parameter ($directory)\n" if $verbose;
-                       push @skipped, $dir;
-                       next;
+sub is_trusted_checkout {
+       my $command=shift;
+       
+       # To determine if the command is safe, compare it with the
+       # *_trusted_checkout config settings. Those settings are
+       # templates for allowed commands, so make sure that each word
+       # of the command matches the corresponding word of the template.
+       
+       my @words;
+       foreach my $word (split(' ', $command)) {
+               # strip quoting
+               if ($word=~/^'(.*)'$/) {
+                       $word=$1;
+               }
+               elsif ($word=~/^"(.*)"$/) {
+                       $word=$1;

                }
 
                }
 

-               print "\n" unless $first;
-               $first=0;
+               push @words, $word;
+       }

 
 

-               if (exists $config{$topdir}{$subdir}{skip}) {
-                       my $ret=system($config{$topdir}{$subdir}{skip});
-                       if ($ret >> 8 == 0) {
-                               print "mr $action: $dir skipped per config file\n" if $verbose;
-                               push @skipped, $dir;
-                               next;
-                       }
-               }
+       foreach my $key (grep { /_trusted_checkout$/ }
+                        keys %{$config{''}{DEFAULT}}) {
+               my @twords=split(' ', $config{''}{DEFAULT}{$key});
+               next if @words > @twords;

 
 

-               if ($action eq 'checkout') {
-                       if (-e $dir) {
-                               print "mr $action: $dir already exists, skipping checkout\n";
-                               push @skipped, $dir;
-                               next;
+               my $match=1;
+               my $url;
+               for (my $c=0; $c < @twords && $match; $c++) {
+                       if ($twords[$c] eq '$url') {
+                               # Match all the typical characters found in
+                               # urls, plus @ which svn can use. Note
+                               # that the "url" might also be a local
+                               # directory.
+                               $match=(
+                                       defined $words[$c] &&
+                                       $words[$c] =~ /^[-_.+:@\/A-Za-z0-9]+$/
+                               );
+                               $url=$words[$c];

                        }
                        }

-                       $dir=~s/^(.*)\/[^\/]+\/?$/$1/;
-               }
-               if (! chdir($dir)) {
-                       print STDERR "mr $action: failed to chdir to $dir: $!\n";
-                       push @skipped, $dir;
-               }
-               elsif (! exists $config{$topdir}{$subdir}{$action}) {
-                       print STDERR "mr $action: no defined $action command for $topdir$subdir, skipping\n";
-                       push @skipped, $dir;
-               }
-               else {
-                       print "mr $action: in $dir\n";
-                       my $command="set -e; my_action(){ $config{$topdir}{$subdir}{$action} ; }; my_action @ARGV";
-                       my $ret=system($command);
-                       if ($ret != 0) {
-                               print STDERR "mr $action: failed to run: $command\n" if $verbose;
-                               push @failures, $topdir.$subdir;
-                               if ($ret >> 8 != 0) {
-                                       print STDERR "mr $action: command failed\n";
-                               }
-                               elsif ($ret != 0) {
-                                       print STDERR "mr $action: command died ($ret)\n";
+                       elsif ($twords[$c] eq '$repo') {
+                               # If a repo is not specified, assume it
+                               # will be the last path component of the
+                               # url, or something derived from it, and
+                               # check that.
+                               if (! defined $words[$c] && defined $url) {
+                                       ($words[$c])=$url=~/\/([^\/]+)\/?$/;

                                }
                                }

+
+                               $match=(
+                                       defined $words[$c] &&
+                                       is_trusted_repo($words[$c])
+                               );
+                       }
+                       elsif (defined $words[$c] && $words[$c]=~/^($twords[$c])$/) {
+                               $match=1;

                        }
                        else {
                        }
                        else {

-                               push @successes, $dir;
+                               $match=0;

                        }
                }
                        }
                }

+               return 1 if $match;

        }
        }

-}

 
 

-sub showstat {
-       my $count=shift;
-       my $singular=shift;
-       my $plural=shift;
-       if ($count) {
-               return "$count ".($count > 1 ? $plural : $singular);
-       }
-       return;
+       return 0;

 }
 }

-print "\nmr $action: finished (".join("; ",
-       showstat($#successes+1, "success", "successes"),
-       showstat($#failures+1, "failure", "failures"),
-       showstat($#skipped+1, "skipped", "skipped"),
-).")\n";
-exit @failures ? 1 : 0;

 
 my %loaded;
 sub loadconfig {
        my $f=shift;
 
 my %loaded;
 sub loadconfig {
        my $f=shift;

+       my $dir=shift;
+       my $bootstrap_url=shift;

 
        my @toload;
 
        my $in;
 
        my @toload;
 
        my $in;

-       my $dir;
+       my $trusted;

        if (ref $f eq 'GLOB') {
        if (ref $f eq 'GLOB') {

-               $in=$f; 

                $dir="";
                $dir="";

+               $in=$f;
+               $trusted=1;

        }
        else {
        }
        else {

-               # $f might be a symlink

                my $absf=abs_path($f);
                if ($loaded{$absf}) {
                        return;
                }
                $loaded{$absf}=1;
 
                my $absf=abs_path($f);
                if ($loaded{$absf}) {
                        return;
                }
                $loaded{$absf}=1;
 

-               print "mr: loading config $f\n" if $verbose;
-               open($in, "<", $f) || die "mr: open $f: $!\n";
-               ($dir)=$f=~/^(.*\/)[^\/]+$/;
+               $trusted=is_trusted_config($absf);
+
+               if (! defined $dir) {
+                       ($dir)=$f=~/^(.*\/)[^\/]+$/;
+                       if (! defined $dir) {
+                               $dir=".";
+                       }
+               }
+

                $dir=abs_path($dir)."/";
                $dir=abs_path($dir)."/";

+               
+               if (! exists $configfiles{$dir}) {
+                       $configfiles{$dir}=$f;
+               }

 
                # copy in defaults from first parent
                my $parent=$dir;
 
                # copy in defaults from first parent
                my $parent=$dir;

-               while ($parent=~s/^(.*)\/[^\/]+\/?$/$1/) {
+               while ($parent=~s/^(.*\/)[^\/]+\/?$/$1/) {
+                       if ($parent eq '/') {
+                               $parent="";
+                       }

                        if (exists $config{$parent} &&
                        if (exists $config{$parent} &&

-                           exists $config{$parent}{default}) {
-                               $config{$dir}{default}={ %{$config{$parent}{default}} };
+                           exists $config{$parent}{DEFAULT}) {
+                               $config{$dir}{DEFAULT}={ %{$config{$parent}{DEFAULT}} };

                                last;
                        }
                }
                                last;
                        }
                }

+               
+               if (! -e $f) {
+                       return;
+               }
+
+               print "mr: loading config $f\n" if $verbose;
+               open($in, "<", $f) || die "mr: open $f: $!\n";

        }
        }

+       my @lines=<$in>;
+       close $in unless ref $f eq 'GLOB';

 
        my $section;
 
        my $section;

-       while (<$in>) {
-               chomp;
+
+       # Keep track of the current line in the config file;
+       # when a file is included track the current line from the include.
+       my $lineno=0;
+       my $included=undef;
+
+       my $line;
+       my $nextline = sub {
+               if ($included) {
+                       $included--;
+               }
+               else {
+                       $included=undef;
+                       $lineno++;
+               }
+               $line=shift @lines;
+               chomp $line;
+               return $line;
+       };
+       my $lineerror = sub {
+               my $msg=shift;
+               if (defined $included) {
+                       die "mr: $msg at $f line $lineno, included line: $line\n";
+               }
+               else {
+                       die "mr: $msg at $f line $lineno\n";
+               }
+       };
+       my $trusterror = sub {
+               my $msg=shift;
+               my ($err, $file, $lineno, $url)=@_;
+       
+               if (defined $bootstrap_url) {
+                       die "mr: $err in untrusted $bootstrap_url line $lineno\n".
+                               "(To trust this url, --trust-all can be used; but please use caution;\n".
+                               "this can allow arbitrary code execution!)\n";
+               }
+               else {
+                       die "mr: $err in untrusted $file line $lineno\n".
+                               "(To trust this file, list it in ~/.mrtrust.)\n";
+               }
+       };
+
+       while (@lines) {
+               $_=$nextline->();
+
+               if (! $trusted && /[[:cntrl:]]/) {
+                       $trusterror->("illegal control character");
+               }
+

                next if /^\s*\#/ || /^\s*$/;
                next if /^\s*\#/ || /^\s*$/;

-               if (/^\s*\[([^\]]*)\]\s*$/) {
+               if (/^\[([^\]]*)\]\s*$/) {

                        $section=$1;
                        $section=$1;

-                       if (length $dir && $section ne "default" &&
-                           -e $dir.$section."/.mrconfig") {
-                               push @toload, $dir.$section."/.mrconfig";
-                       }
+
+                       if (! $trusted) {
+                               if (! is_trusted_repo($section) ||
+                                   $section eq 'ALIAS' ||
+                                   $section eq 'DEFAULT') {
+                                       $trusterror->("illegal section \"[$section]\"");
+                               }
+                       }
+                       $section=expandenv($section) if $trusted;
+                       if ($section ne 'ALIAS' &&
+                           ! exists $config{$dir}{$section} &&
+                           exists $config{$dir}{DEFAULT}) {
+                               # copy in defaults
+                               $config{$dir}{$section}={ %{$config{$dir}{DEFAULT}} };
+                       }

                }
                }

-               elsif (/^\s*(\w+)\s*=\s*(.*)/) {
+               elsif (/^(\w+)\s*=\s*(.*)/) {

                        my $parameter=$1;
                        my $value=$2;
 
                        my $parameter=$1;
                        my $value=$2;
 

-                       # continuation line
-                       while ($value=~/(.*)\\$/) {
-                               $value=$1.<$in>;
+                       # continued value
+                       while (@lines && $lines[0]=~/^\s(.+)/) {
+                               $value.="\n$1";

                                chomp $value;
                                chomp $value;

+                               $nextline->();
+                       }
+
+                       if (! $trusted) {
+                               # Untrusted files can only contain a few
+                               # settings in specific known-safe formats.
+                               if ($parameter eq 'checkout') {
+                                       if (! is_trusted_checkout($value)) {
+                                               $trusterror->("illegal checkout command \"$value\"");
+                                       }
+                               }
+                               elsif ($parameter eq 'order') {
+                                       # not interpreted as a command, so
+                                       # safe.
+                               }
+                               elsif ($value eq 'true' || $value eq 'false') {
+                                       # skip=true , deleted=true etc are
+                                       # safe.
+                               }
+                               else {
+                                       $trusterror->("illegal setting \"$parameter=$value\"");
+                               }
+                       }
+
+                       if ($parameter eq "include") {
+                               print "mr: including output of \"$value\"\n" if $verbose;
+                               my @inc=`$value`;
+                               if ($?) {
+                                       print STDERR "mr: include command exited nonzero ($?)\n";
+                               }
+                               $included += @inc;
+                               unshift @lines, @inc;
+                               next;

                        }
 
                        if (! defined $section) {
                        }
 
                        if (! defined $section) {

-                               die "$f line $.: parameter ($parameter) not in section\n";
+                               $lineerror->("parameter ($parameter) not in section");

                        }
                        }

-                       if (! exists $config{$dir}{$section} &&
-                             exists $config{$dir}{default}) {
-                               # copy in defaults
-                               $config{$dir}{$section}={ %{$config{$dir}{default}} };
+                       if ($section eq 'ALIAS') {
+                               $alias{$parameter}=$value;
+                       }
+                       elsif ($parameter eq 'lib' or $parameter =~ s/_append$//) {
+                               $config{$dir}{$section}{$parameter}.="\n".$value."\n";
+                       }
+                       else {
+                               $config{$dir}{$section}{$parameter}=$value;
+                               if ($parameter =~ /.*_(.*)/) {
+                                       $knownactions{$1}=1;
+                               }
+                               else {
+                                       $knownactions{$parameter}=1;
+                               }
+                               if ($parameter eq 'chain' &&
+                                   length $dir && $section ne "DEFAULT") {
+                                       my $chaindir="$section";
+                                       if ($chaindir !~ m!^/!) {
+                                               $chaindir=$dir.$chaindir;
+                                       }
+                                       if (-e "$chaindir/.mrconfig") {
+                                               my $ret=system($value);
+                                               if ($ret != 0) {
+                                                       if (($? & 127) == 2) {
+                                                               print STDERR "mr: chain test interrupted\n";
+                                                               exit 2;
+                                                       }
+                                                       elsif ($? & 127) {
+                                                               print STDERR "mr: chain test received signal ".($? & 127)."\n";
+                                                       }
+                                               }
+                                               else {
+                                                       push @toload, ["$chaindir/.mrconfig", $chaindir];
+                                               }
+                                       }
+                               }

                        }
                        }

-                       $config{$dir}{$section}{$parameter}=$value;

                }
                else {
                }
                else {

-                               die "$f line $.: parse error\n";
+                       $lineerror->("parse error");

                }
        }
                }
        }

-       close $in;

 
 

-       foreach (@toload) {
-               loadconfig($_);
+       foreach my $c (@toload) {
+               loadconfig(@$c);

        }
 }
 
        }
 }
 

-__DATA__
-# Some useful actions that mr knows about by default.
+sub startingconfig {
+       %alias=%config=%configfiles=%knownactions=%loaded=();
+       my $datapos=tell(DATA);
+       loadconfig(\*DATA);
+       seek(DATA,$datapos,0); # rewind
+}
+
+sub modifyconfig {
+       my $f=shift;
+       # the section to modify or add
+       my $targetsection=shift;
+       # fields to change in the section
+       # To remove a field, set its value to "".
+       my %changefields=@_;
+
+       my @lines;
+       my @out;
+
+       if (-e $f) {
+               open(my $in, "<", $f) || die "mr: open $f: $!\n";
+               @lines=<$in>;
+               close $in;
+       }
+
+       my $formatfield=sub {
+               my $field=shift;
+               my @value=split(/\n/, shift);
+
+               return "$field = ".shift(@value)."\n".
+                       join("", map { "\t$_\n" } @value);
+       };
+       my $addfields=sub {
+               my @blanks;
+               while ($out[$#out] =~ /^\s*$/) {
+                       unshift @blanks, pop @out;
+               }
+               foreach my $field (sort keys %changefields) {
+                       if (length $changefields{$field}) {
+                               push @out, "$field = $changefields{$field}\n";
+                               delete $changefields{$field};
+                       }
+               }
+               push @out, @blanks;
+       };
+
+       my $section;
+       while (@lines) {
+               $_=shift(@lines);
+
+               if (/^\s*\#/ || /^\s*$/) {
+                       push @out, $_;
+               }
+               elsif (/^\[([^\]]*)\]\s*$/) {
+                       if (defined $section && 
+                           $section eq $targetsection) {
+                               $addfields->();
+                       }
+
+                       $section=expandenv($1);
+
+                       push @out, $_;
+               }
+               elsif (/^(\w+)\s*=\s(.*)/) {
+                       my $parameter=$1;
+                       my $value=$2;
+
+                       # continued value
+                       while (@lines && $lines[0]=~/^\s(.+)/) {
+                               shift(@lines);
+                               $value.="\n$1";
+                               chomp $value;
+                       }
+
+                       if ($section eq $targetsection) {
+                               if (exists $changefields{$parameter}) {
+                                       if (length $changefields{$parameter}) {
+                                               $value=$changefields{$parameter};
+                                       }
+                                       delete $changefields{$parameter};
+                               }
+                       }
+
+                       push @out, $formatfield->($parameter, $value);
+               }
+       }
+
+       if (defined $section && 
+           $section eq $targetsection) {
+               $addfields->();
+       }
+       elsif (%changefields) {
+               push @out, "\n[$targetsection]\n";
+               foreach my $field (sort keys %changefields) {
+                       if (length $changefields{$field}) {
+                               push @out, $formatfield->($field, $changefields{$field});
+                       }
+               }
+       }
+
+       open(my $out, ">", $f) || die "mr: write $f: $!\n";
+       print $out @out;
+       close $out;     
+}
+
+sub dispatch {
+       my $action=shift;
+
+       # actions that do not operate on all repos
+       if ($action eq 'help') {
+               help(@ARGV);
+       }
+       elsif ($action eq 'config') {
+               config(@ARGV);
+       }
+       elsif ($action eq 'register') {
+               register(@ARGV);
+       }
+       elsif ($action eq 'bootstrap') {
+               bootstrap();
+       }
+       elsif ($action eq 'remember' ||
+              $action eq 'offline' ||
+              $action eq 'online') {
+               my @repos=selectrepos;
+               action($action, @{$repos[0]}) if @repos;
+               exit 0;
+       }
+
+       if (!$jobs || $jobs > 1) {
+               mrs($action, selectrepos());
+       }
+       else {
+               foreach my $repo (selectrepos()) {
+                       record($repo, action($action, @$repo));
+               }
+       }
+}
+
+sub help {
+       exec($config{''}{DEFAULT}{help}) || die "exec: $!";
+}
+
+sub config {
+       if (@_ < 2) {
+               die "mr config: not enough parameters\n";
+       }
+       my $section=shift;
+       if ($section=~/^\//) {
+               # try to convert to a path relative to the config file
+               my ($dir)=$ENV{MR_CONFIG}=~/^(.*\/)[^\/]+$/;
+               $dir=abs_path($dir);
+               $dir.="/" unless $dir=~/\/$/;
+               if ($section=~/^\Q$dir\E(.*)/) {
+                       $section=$1;
+               }
+       }
+       my %changefields;
+       foreach (@_) {
+               if (/^([^=]+)=(.*)$/) {
+                       $changefields{$1}=$2;
+               }
+               else {
+                       my $found=0;
+                       foreach my $topdir (sort keys %config) {
+                               if (exists $config{$topdir}{$section} &&
+                                   exists $config{$topdir}{$section}{$_}) {
+                                       print $config{$topdir}{$section}{$_}."\n";
+                                       $found=1;
+                                       last if $section eq 'DEFAULT';
+                               }
+                       }
+                       if (! $found) {
+                               die "mr config: $section $_ not set\n";
+                       }
+               }
+       }
+       modifyconfig($ENV{MR_CONFIG}, $section, %changefields) if %changefields;
+       exit 0;
+}
+
+sub register {
+       if ($config_overridden) {
+               # Find the directory that the specified config file is
+               # located in.
+               ($directory)=abs_path($ENV{MR_CONFIG})=~/^(.*\/)[^\/]+$/;
+       }
+       else {
+               # Find the closest known mrconfig file to the current
+               # directory.
+               $directory.="/" unless $directory=~/\/$/;
+               my $foundconfig=0;
+               foreach my $topdir (reverse sort keys %config) {
+                       next unless length $topdir;
+                       if ($directory=~/^\Q$topdir\E/) {
+                               $ENV{MR_CONFIG}=$configfiles{$topdir};
+                               $directory=$topdir;
+                               $foundconfig=1;
+                               last;
+                       }
+               }
+               if (! $foundconfig) {
+                       $directory=""; # no config file, use builtin
+               }
+       }
+       if (@ARGV) {
+               my $subdir=shift @ARGV;
+               if (! chdir($subdir)) {
+                       print STDERR "mr register: failed to chdir to $subdir: $!\n";
+               }
+       }
+
+       $ENV{MR_REPO}=getcwd();
+       my $command=findcommand("register", $ENV{MR_REPO}, $directory, 'DEFAULT', 0);
+       if (! defined $command) {
+               die "mr register: unknown repository type\n";
+       }
+
+       $ENV{MR_REPO}=~s/.*\/(.*)/$1/;
+       $command="set -e; ".$config{$directory}{DEFAULT}{lib}."\n".
+               "my_action(){ $command\n }; my_action ".
+               join(" ", map { s/\\/\\\\/g; s/"/\"/g; '"'.$_.'"' } @ARGV);
+       print "mr register: running >>$command<<\n" if $verbose;
+       exec($command) || die "exec: $!";
+}
+
+sub bootstrap {
+       my $url=shift @ARGV;
+       my $dir=shift @ARGV || ".";
+       
+       if (! defined $url || ! length $url) {
+               die "mr: bootstrap requires url\n";
+       }
+       
+       # Download the config file to a temporary location.
+       eval q{use File::Temp};
+       die $@ if $@;
+       my $tmpconfig=File::Temp->new();
+       my @curlargs = ("curl", "-A", "mr", "-L", "-s", $url, "-o", $tmpconfig);
+       push(@curlargs, "-k") if $insecure;
+       my $curlstatus = system(@curlargs);
+       die "mr bootstrap: invalid SSL certificate for $url (consider -k)\n" if $curlstatus >> 8 == 60;
+       die "mr bootstrap: download of $url failed\n" if $curlstatus != 0;
+
+       if (! -e $dir) {
+               system("mkdir", "-p", $dir);
+       }
+       chdir($dir) || die "chdir $dir: $!";
+
+       # Special case to handle checkout of the "." repo, which 
+       # would normally be skipped.
+       my $topdir=abs_path(".")."/";
+       my @repo=($topdir, $topdir, ".");
+       loadconfig($tmpconfig, $topdir, $url);
+       record(\@repo, action("checkout", @repo, 1))
+               if exists $config{$topdir}{"."}{"checkout"};
+
+       if (-e ".mrconfig") {
+               print STDERR "mr bootstrap: .mrconfig file already exists, not overwriting with $url\n";
+       }
+       else {
+               eval q{use File::Copy};
+               die $@ if $@;
+               move($tmpconfig, ".mrconfig") || die "rename: $!";
+       }
+
+       # Reload the config file (in case we got a different version)
+       # and checkout everything else.
+       startingconfig();
+       loadconfig(".mrconfig");
+       dispatch("checkout");
+       @skipped=grep { abs_path($_) ne abs_path($topdir) } @skipped;
+       showstats("bootstrap");
+       exitstats();
+}
+
+# alias expansion and command stemming
+sub expandaction {
+       my $action=shift;
+       if (exists $alias{$action}) {
+               $action=$alias{$action};
+       }
+       if (! exists $knownactions{$action}) {
+               my @matches = grep { /^\Q$action\E/ }
+                       keys %knownactions, keys %alias;
+               if (@matches == 1) {
+                       $action=$matches[0];
+               }
+               elsif (@matches == 0) {
+                       die "mr: unknown action \"$action\" (known actions: ".
+                               join(", ", sort keys %knownactions).")\n";
+               }
+               else {
+                       die "mr: ambiguous action \"$action\" (matches: ".
+                               join(", ", @matches).")\n";
+               }
+       }
+       return $action;
+}
+
+sub find_mrconfig {
+       my $dir=getcwd();
+       while (length $dir) {
+               if (-e "$dir/.mrconfig") {
+                       return "$dir/.mrconfig";
+               }
+               $dir=~s/\/[^\/]*$//;
+       }
+       return $HOME_MR_CONFIG;
+}
+
+sub getopts {
+       my @saved=@ARGV;
+       Getopt::Long::Configure("bundling", "no_permute");
+       my $result=GetOptions(
+               "d|directory=s" => sub { $directory=abs_path($_[1]) },
+               "c|config=s" => sub { $ENV{MR_CONFIG}=$_[1]; $config_overridden=1 },
+               "p|path" => sub { }, # now default, ignore
+               "f|force" => \$force,
+               "v|verbose" => \$verbose,
+               "q|quiet" => \$quiet,
+               "s|stats" => \$stats,
+               "k|insecure" => \$insecure,
+               "i|interactive" => \$interactive,
+               "n|no-recurse:i" => \$max_depth,
+               "j|jobs:i" => \$jobs,
+               "t|trust-all" => \$trust_all,
+       );
+       if (! $result || @ARGV < 1) {
+               die("Usage: mr [options] action [params ...]\n".
+                   "(Use mr help for man page.)\n");
+       }
+       
+       $ENV{MR_SWITCHES}="";
+       foreach my $option (@saved) {
+               last if $option eq $ARGV[0];
+               $ENV{MR_SWITCHES}.="$option ";
+       }
+}
+
+sub init {
+       $SIG{INT}=sub {
+               print STDERR "mr: interrupted\n";
+               exit 2;
+       };
+       
+       # This can happen if it's run in a directory that was removed
+       # or other strangeness.
+       if (! defined $directory) {
+               die("mr: failed to determine working directory\n");
+       }
+       # Make sure MR_CONFIG is an absolute path, but don't use abs_path since
+       # the config file might be a symlink to elsewhere, and the directory it's
+       # in is significant.
+       if ($ENV{MR_CONFIG} !~ /^\//) {
+               $ENV{MR_CONFIG}=getcwd()."/".$ENV{MR_CONFIG};
+       }
+       # Try to set MR_PATH to the path to the program.
+       eval {
+               use FindBin qw($Bin $Script);
+               $ENV{MR_PATH}=$Bin."/".$Script;
+       };
+}
+       
+sub exitstats {
+       if (@failed) {
+               exit 1;
+       }
+       else {
+               exit 0;
+       }
+}
+
+sub main {
+       getopts();
+       init();
+
+       startingconfig();
+       loadconfig($HOME_MR_CONFIG);
+       loadconfig($ENV{MR_CONFIG});
+       #use Data::Dumper; print Dumper(\%config);
+       
+       my $action=expandaction(shift @ARGV);
+       dispatch($action);
+
+       showstats($action);
+       exitstats();
+}
+
+# Finally, some useful actions that mr knows about by default.

 # These can be overridden in ~/.mrconfig.
 # These can be overridden in ~/.mrconfig.

-[default]
-update = \
-       if [ -d .svn ]; then \
-               svn update; \
-       elif [ -d .git ]; then \
-               git pull origin master; \
-       else \
-               echo "mr update: unknown RCS"; \
-               exit 1; \
+__DATA__
+[ALIAS]
+co = checkout
+ci = commit
+ls = list
+
+[DEFAULT]
+order = 10
+lib =
+       error() {
+               echo "mr: $@" >&2
+               exit 1
+       }
+       warning() {
+               echo "mr (warning): $@" >&2
+       }
+       info() {
+               echo "mr: $@" >&2
+       }
+       hours_since() {
+               if [ -z "$1" ] || [ -z "$2" ]; then
+                       error "mr: usage: hours_since action num"
+               fi
+               for dir in .git .svn .bzr CVS .hg _darcs _FOSSIL_; do
+                       if [ -e "$MR_REPO/$dir" ]; then
+                               flagfile="$MR_REPO/$dir/.mr_last$1"
+                               break
+                       fi
+               done
+               if [ -z "$flagfile" ]; then
+                       error "cannot determine flag filename"
+               fi
+               delta=`perl -wle 'print -f shift() ? int((-M _) * 24) : 9999' "$flagfile"`
+               if [ "$delta" -lt "$2" ]; then
+                       return 1
+               else
+                       touch "$flagfile"
+                       return 0
+               fi
+       }
+       is_bzr_checkout() {
+               LANG=C bzr info | egrep -q '^Checkout'
+       }
+       lazy() {
+               if [ -d "$MR_REPO" ]; then
+                       return 1
+               else
+                       return 0
+               fi
+       }
+
+svn_dir_test = echo svn .svn
+git_dir_test = echo git .git
+bzr_dir_test = echo bzr .bzr
+cvs_dir_test = echo cvs CVS
+hg_dir_test  = echo hg .hg
+darcs_dir_test = echo darcs _darcs
+fossil_test = test -f "$MR_REPO"/_FOSSIL_
+git_bare_test =
+       test -d "$MR_REPO"/refs/heads && test -d "$MR_REPO"/refs/tags &&
+       test -d "$MR_REPO"/objects && test -f "$MR_REPO"/config &&
+       test "`GIT_CONFIG="$MR_REPO"/config git config --get core.bare`" = true
+
+svn_update = svn update "$@"
+git_update = git pull "$@"
+bzr_update = 
+       if is_bzr_checkout; then
+               bzr update "$@"
+       else
+               bzr merge --pull "$@"
+       fi
+cvs_update = cvs update "$@"
+hg_update  = hg pull "$@" && hg update "$@"
+darcs_update = darcs pull -a "$@"
+fossil_update = fossil pull "$@"
+
+svn_status = svn status "$@"
+git_status = git status -s "$@" || true
+bzr_status = bzr status --short "$@"
+cvs_status = cvs status "$@"
+hg_status  = hg status "$@"
+darcs_status = darcs whatsnew -ls "$@" || true
+fossil_status = fossil changes "$@"
+
+svn_commit = svn commit "$@"
+git_commit = git commit -a "$@" && git push --all
+bzr_commit = 
+       if is_bzr_checkout; then
+               bzr commit "$@"
+       else
+               bzr commit "$@" && bzr push
+       fi
+cvs_commit = cvs commit "$@"
+hg_commit  = hg commit -m "$@" && hg push
+darcs_commit = darcs record -a -m "$@" && darcs push -a
+fossil_commit = fossil commit "$@"
+
+git_record = git commit -a "$@"
+bzr_record =
+       if is_bzr_checkout; then
+               bzr commit --local "$@"
+       else
+               bzr commit "$@"

        fi
        fi

-status = \
-       if [ -d .svn ]; then \
-               svn status; \
-       elif [ -d .git ]; then \
-               git status || true; \
-       else \
-               echo "mr status: unknown RCS"; \
-               exit 1; \
+hg_record  = hg commit -m "$@"
+darcs_record = darcs record -a -m "$@"
+fossil_record = fossil commit "$@"
+
+svn_push = :
+git_push = git push "$@"
+bzr_push = bzr push "$@"
+cvs_push = :
+hg_push = hg push "$@"
+darcs_push = darcs push -a "$@"
+fossil_push = fossil push "$@"
+
+svn_diff = svn diff "$@"
+git_diff = git diff "$@"
+bzr_diff = bzr diff "$@"
+cvs_diff = cvs diff "$@"
+hg_diff  = hg diff "$@"
+darcs_diff = darcs diff -u "$@"
+fossil_diff = fossil diff "$@"
+
+svn_log = svn log "$@"
+git_log = git log "$@"
+bzr_log = bzr log "$@"
+cvs_log = cvs log "$@"
+hg_log  = hg log "$@"
+darcs_log = darcs changes "$@"
+git_bare_log = git log "$@"
+fossil_log = fossil timeline "$@"
+
+run = "$@"
+
+svn_register =
+       url=`LC_ALL=C svn info . | grep -i '^URL:' | cut -d ' ' -f 2`
+       if [ -z "$url" ]; then
+               error "cannot determine svn url"
+       fi
+       echo "Registering svn url: $url in $MR_CONFIG"
+       mr -c "$MR_CONFIG" config "`pwd`" checkout="svn co '$url' '$MR_REPO'"
+git_register = 
+       url="`LC_ALL=C git config --get remote.origin.url`" || true
+       if [ -z "$url" ]; then
+               error "cannot determine git url"
+       fi
+       echo "Registering git url: $url in $MR_CONFIG"
+       mr -c "$MR_CONFIG" config "`pwd`" checkout="git clone '$url' '$MR_REPO'"
+bzr_register =
+       url="`LC_ALL=C bzr info . | egrep -i 'checkout of branch|parent branch' | awk '{print $NF}'`"
+       if [ -z "$url" ]; then
+               error "cannot determine bzr url"
+       fi
+       echo "Registering bzr url: $url in $MR_CONFIG"
+       mr -c "$MR_CONFIG" config "`pwd`" checkout="bzr branch '$url' '$MR_REPO'"
+cvs_register =
+       repo=`cat CVS/Repository`
+       root=`cat CVS/Root`
+       if [ -z "$root" ]; then
+               error "cannot determine cvs root"
+               fi
+       echo "Registering cvs repository $repo at root $root"
+       mr -c "$MR_CONFIG" config "`pwd`" checkout="cvs -d '$root' co -d '$MR_REPO' '$repo'"
+hg_register = 
+       url=`hg showconfig paths.default`
+       echo "Registering mercurial repo url: $url in $MR_CONFIG"
+       mr -c "$MR_CONFIG" config "`pwd`" checkout="hg clone '$url' '$MR_REPO'"
+darcs_register = 
+       url=`cat _darcs/prefs/defaultrepo`
+       echo "Registering darcs repository $url in $MR_CONFIG"
+       mr -c "$MR_CONFIG" config "`pwd`" checkout="darcs get '$url' '$MR_REPO'"
+git_bare_register = 
+       url="`LC_ALL=C GIT_CONFIG=config git config --get remote.origin.url`" || true
+       if [ -z "$url" ]; then
+               error "cannot determine git url"

        fi
        fi

-commit = \
-       if [ -d .svn ]; then \
-               svn commit "$@"; \
-       elif [ -d .git ]; then \
-               git commit -a "$@"; \
-       else \
-               echo "mr commit: unknown RCS"; \
-               exit 1; \
+       echo "Registering git url: $url in $MR_CONFIG"
+       mr -c "$MR_CONFIG" config "`pwd`" checkout="git clone --bare '$url' '$MR_REPO'"
+fossil_register =
+       url=`fossil remote-url`
+       repo=`fossil info | grep repository | sed -e 's/repository:*.//g' -e 's/ //g'`
+       echo "Registering fossil repository $url in $MR_CONFIG"
+       mr -c "$MR_CONFIG" config "`pwd`" checkout="mkdir -p '$MR_REPO' && cd '$MR_REPO' && fossil open '$repo'"
+
+svn_trusted_checkout = svn co $url $repo
+svn_alt_trusted_checkout = svn checkout $url $repo
+git_trusted_checkout = git clone $url $repo
+bzr_trusted_checkout = bzr checkout|clone|branch|get $url $repo
+# cvs: too hard
+hg_trusted_checkout = hg clone $url $repo
+darcs_trusted_checkout = darcs get $url $repo
+git_bare_trusted_checkout = git clone --bare $url $repo
+# fossil: messy to do
+
+
+help =
+       case `uname -s` in
+               SunOS)
+               SHOWMANFILE="man -f"
+               ;;
+               Darwin)
+               SHOWMANFILE="man"
+               ;;
+               *)
+               SHOWMANFILE="man -l"
+               ;;
+       esac
+       if [ ! -e "$MR_PATH" ]; then
+               error "cannot find program path"
+       fi
+       tmp=$(mktemp -t mr.XXXXXXXXXX) || error "mktemp failed"
+       trap "rm -f $tmp" exit
+       pod2man -c mr "$MR_PATH" > "$tmp" || error "pod2man failed"
+       $SHOWMANFILE "$tmp" || error "man failed"
+list = true
+config = 
+bootstrap = 
+
+online =
+       if [ -s ~/.mrlog ]; then
+               info "running offline commands"
+               mv -f ~/.mrlog ~/.mrlog.old
+               if ! sh -e ~/.mrlog.old; then
+                       error "offline command failed; left in ~/.mrlog.old"
+               fi
+               rm -f ~/.mrlog.old
+       else
+               info "no offline commands to run"
+       fi
+offline =
+       umask 077
+       touch ~/.mrlog
+       info "offline mode enabled"
+remember =
+       info "remembering command: 'mr $@'"
+       command="mr -d '$(pwd)' $MR_SWITCHES"
+       for w in "$@"; do
+               command="$command '$w'"
+       done
+       if [ ! -e ~/.mrlog ] || ! grep -q -F "$command" ~/.mrlog; then
+               echo "$command" >> ~/.mrlog

        fi
        fi

+
+ed = echo "A horse is a horse, of course, of course.."
+T = echo "I pity the fool."
+right = echo "Not found."
+
+# vim:sw=8:sts=0:ts=8:noet
+# Local variables:
+# indent-tabs-mode: t
+# cperl-indent-level: 8
+# End: