bootstrap: document stdin

[code/myrepos.git] / mr

diff --git a/mr b/mr
index 8601aeb422df35262239d308b18e6189b8037e6c..dba54cc63142a63e1a497db380f67e82bb3565b4 100755 (executable)
--- a/mr
+++ b/mr
@@ -28,7 +28,7 @@ B<mr> [options] grep pattern
 
 B<mr> [options] run command [param ...]
 
-B<mr> [options] bootstrap url [directory]
+B<mr> [options] bootstrap src [directory]
 
 B<mr> [options] register [repository]
 
@@ -130,17 +130,39 @@ These commands are also available:
 
 =over 4
 
-=item bootstrap url [directory]
+=item bootstrap src [directory]
 
-Causes mr to download the url, and use it as a .mrconfig file to checkout
-the repositories listed in it, into the specified directory.
+Causes mr to retrieve the source C<src> and use it as a .mrconfig file to
+checkout the repositories listed in it, into the specified directory.
 
-To use scp to download, the url may have the form ssh://[user@]host:file
+B<mr> understands several types of sources:
+
+=over 4
+
+=item URL for curl
+
+C<src> may be an URL understood by B<curl>.
+
+=item copy via ssh
+
+To use B<scp> to download, the C<src> may have the form
+C<ssh://[user@]host:file>.
+
+=item local file
+
+You can retrieve the config file by other means and pass its B<path> as C<src>.
+
+=item standard input
+
+If source C<src> consists in a single dash C<->, config file is read from
+standard input.
+
+=back
 
 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
+As a special case, if source C<src> includes a repository named ".", that
 is checked out into the top of the specified directory.
 
 =item list (or ls)
@@ -1223,7 +1245,7 @@ my %loaded;
 sub loadconfig {
        my $f=shift;
        my $dir=shift;
-       my $bootstrap_url=shift;
+       my $bootstrap_src=shift;
 
        my @toload;
 
@@ -1311,8 +1333,8 @@ sub loadconfig {
        my $trusterror = sub {
                my $msg=shift;
        
-               if (defined $bootstrap_url) {
-                       die "mr: $msg in untrusted $bootstrap_url line $lineno\n".
+               if (defined $bootstrap_src) {
+                       die "mr: $msg in untrusted $bootstrap_src line $lineno\n".
                                "(To trust this url, --trust-all can be used; but please use caution;\n".
                                "this can allow arbitrary code execution!)\n";
                }
@@ -1672,37 +1694,41 @@ sub bootstrap {
        eval q{use File::Copy};
        die $@ if $@;
 
-       my $url=shift @ARGV;
+       my $src=shift @ARGV;
        my $dir=shift @ARGV || ".";
        
-       if (! defined $url || ! length $url) {
-               die "mr: bootstrap requires url\n";
+       if (! defined $src || ! length $src) {
+               die "mr: bootstrap requires source\n";
        }
 
        # Retrieve config file.
        eval q{use File::Temp};
        die $@ if $@;
        my $tmpconfig=File::Temp->new();
-       if ($url =~ m!^[\w\d]+://!) {
+       if ($src =~ m!^[\w\d]+://!) {
                # Download the config file to a temporary location.
                my @downloader;
-               if ($url =~ m!^ssh://(.*)!) {
+               if ($src =~ m!^ssh://(.*)!) {
                        @downloader = ("scp", $1, $tmpconfig);
                }
                else {
-                       @downloader = ("curl", "-A", "mr", "-L", "-s", $url, "-o", $tmpconfig);
+                       @downloader = ("curl", "-A", "mr", "-L", "-s", $src, "-o", $tmpconfig);
                        push(@downloader, "-k") if $insecure;
                }
                my $status = system(@downloader);
-               die "mr bootstrap: invalid SSL certificate for $url (consider -k)\n"
+               die "mr bootstrap: invalid SSL certificate for $src (consider -k)\n"
                        if $downloader[0] eq 'curl' && $status >> 8 == 60;
-               die "mr bootstrap: download of $url failed\n" if $status != 0;
+               die "mr bootstrap: download of $src failed\n" if $status != 0;
+       }
+       elsif ($src eq '-') {
+               # Config file is read from stdin.
+               copy(\*STDIN, $tmpconfig) || die "stdin: $!";
        }
        else {
                # Config file is local.
-               die "mr bootstrap: cannot read file '$url'"
-                       unless -r $url;
-               copy($url, $tmpconfig) || die "copy: $!";
+               die "mr bootstrap: cannot read file '$src'"
+                       unless -r $src;
+               copy($src, $tmpconfig) || die "copy: $!";
        }
 
        # Sanity check on destination directory.
@@ -1715,12 +1741,12 @@ sub bootstrap {
        # would normally be skipped.
        my $topdir=abs_path(".")."/";
        my @repo=($topdir, $topdir, ".");
-       loadconfig($tmpconfig, $topdir, $url);
+       loadconfig($tmpconfig, $topdir, $src);
        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";
+               print STDERR "mr bootstrap: .mrconfig file already exists, not overwriting with $src\n";
        }
        else {
                move($tmpconfig, ".mrconfig") || die "rename: $!";