+       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 "$ENV{HOME}/.mrconfig";
+}
+
+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
+               "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."/".$Script;
+       };
+}
+       
+sub exitstats {
+       if (@failed) {
+               exit 1;
+       }
+       else {
+               exit 0;
+       }
+}
+
+sub main {
+       getopts();
+       init();
+
+       startingconfig();
+       loadconfig("$ENV{HOME}/.mrconfig");
+       loadconfig($ENV{MR_CONFIG});
+       #use Data::Dumper; print Dumper(\%config);
+       
+       my $action=expandaction(shift @ARGV);
+       dispatch($action);
+
+       showstats($action);
+       exitstats();