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Diffstat (limited to 'git-cvsexportcommit.perl')
| -rwxr-xr-x | git-cvsexportcommit.perl | 246 |
1 files changed, 246 insertions, 0 deletions
diff --git a/git-cvsexportcommit.perl b/git-cvsexportcommit.perl new file mode 100755 index 0000000..7b3a3d3 --- /dev/null +++ b/git-cvsexportcommit.perl @@ -0,0 +1,246 @@ +#!/usr/bin/perl -w + +use strict; +use Getopt::Std; +use File::Temp qw(tempdir); +use Data::Dumper; +use File::Basename qw(basename); + +unless ($ENV{GIT_DIR} && -r $ENV{GIT_DIR}){ + die "GIT_DIR is not defined or is unreadable"; +} + +our ($opt_h, $opt_p, $opt_v, $opt_c ); + +getopts('hpvc'); + +$opt_h && usage(); + +die "Need at least one commit identifier!" unless @ARGV; + +# setup a tempdir +our ($tmpdir, $tmpdirname) = tempdir('git-cvsapplycommit-XXXXXX', + TMPDIR => 1, + CLEANUP => 1); + +print Dumper(@ARGV); +# resolve target commit +my $commit; +$commit = pop @ARGV; +$commit = safe_pipe_capture('git-rev-parse', '--verify', "$commit^0"); +chomp $commit; +if ($?) { + die "The commit reference $commit did not resolve!"; +} + +# resolve what parent we want +my $parent; +if (@ARGV) { + $parent = pop @ARGV; + $parent = safe_pipe_capture('git-rev-parse', '--verify', "$parent^0"); + chomp $parent; + if ($?) { + die "The parent reference did not resolve!"; + } +} + +# find parents from the commit itself +my @commit = safe_pipe_capture('git-cat-file', 'commit', $commit); +my @parents; +foreach my $p (@commit) { + if ($p =~ m/^$/) { # end of commit headers, we're done + last; + } + if ($p =~ m/^parent (\w{40})$/) { # found a parent + push @parents, $1; + } +} + +if ($parent) { + # double check that it's a valid parent + foreach my $p (@parents) { + my $found; + if ($p eq $parent) { + $found = 1; + last; + }; # found it + die "Did not find $parent in the parents for this commit!"; + } +} else { # we don't have a parent from the cmdline... + if (@parents == 1) { # it's safe to get it from the commit + $parent = $parents[0]; + } else { # or perhaps not! + die "This commit has more than one parent -- please name the parent you want to use explicitly"; + } +} + +$opt_v && print "Applying to CVS commit $commit from parent $parent\n"; + +# grab the commit message +`git-cat-file commit $commit | sed -e '1,/^\$/d' > .msg`; +$? && die "Error extracting the commit message"; + +my (@afiles, @dfiles, @mfiles); +my @files = safe_pipe_capture('git-diff-tree', '-r', $parent, $commit); +print @files; +$? && die "Error in git-diff-tree"; +foreach my $f (@files) { + chomp $f; + my @fields = split(m!\s+!, $f); + if ($fields[4] eq 'A') { + push @afiles, $fields[5]; + } + if ($fields[4] eq 'M') { + push @mfiles, $fields[5]; + } + if ($fields[4] eq 'R') { + push @dfiles, $fields[5]; + } +} +$opt_v && print "The commit affects:\n "; +$opt_v && print join ("\n ", @afiles,@mfiles,@dfiles) . "\n\n"; +undef @files; # don't need it anymore + +# check that the files are clean and up to date according to cvs +my $dirty; +foreach my $f (@afiles) { + # This should return only one value + my @status = grep(m/^File/, safe_pipe_capture('cvs', '-q', 'status' ,$f)); + if (@status > 1) { warn 'Strange! cvs status returned more than one line?'}; + unless ($status[0] =~ m/Status: Unknown$/) { + $dirty = 1; + warn "File $f is already known in your CVS checkout!\n"; + } +} +foreach my $f (@mfiles, @dfiles) { + # TODO:we need to handle removed in cvs + my @status = grep(m/^File/, safe_pipe_capture('cvs', '-q', 'status' ,$f)); + if (@status > 1) { warn 'Strange! cvs status returned more than one line?'}; + unless ($status[0] =~ m/Status: Up-to-date$/) { + $dirty = 1; + warn "File $f not up to date in your CVS checkout!\n"; + } +} +if ($dirty) { + die "Exiting: your CVS tree is not clean for this merge."; +} + +### +### NOTE: if you are planning to die() past this point +### you MUST call cleanupcvs(@files) before die() +### + + +print "'Patching' binary files\n"; + +my @bfiles = grep(m/^Binary/, safe_pipe_capture('git-diff-tree', '-p', $parent, $commit)); +@bfiles = map { chomp } @bfiles; +foreach my $f (@bfiles) { + # check that the file in cvs matches the "old" file + # extract the file to $tmpdir and comparre with cmp + my $tree = safe_pipe_capture('git-rev-parse', "$parent^{tree}"); + chomp $tree; + my $blob = `git-ls-tree $tree "$f" | cut -f 1 | cut -d ' ' -f 3`; + chomp $blob; + `git-cat-file blob $blob > $tmpdir/blob`; + if (system('cmp', '-q', $f, "$tmpdir/blob")) { + warn "Binary file $f in CVS does not match parent.\n"; + $dirty = 1; + next; + } + + # replace with the new file + `git-cat-file blob $blob > $f`; + + # TODO: something smart with file modes + +} +if ($dirty) { + cleanupcvs(@files); + die "Exiting: Binary files in CVS do not match parent"; +} + +## apply non-binary changes +my $fuzz = $opt_p ? 0 : 2; + +print "Patching non-binary files\n"; +print `(git-diff-tree -p $parent -p $commit | patch -p1 -F $fuzz ) 2>&1`; + +my $dirtypatch = 0; +if (($? >> 8) == 2) { + cleanupcvs(@files); + die "Exiting: Patch reported serious trouble -- you will have to apply this patch manually"; +} elsif (($? >> 8) == 1) { # some hunks failed to apply + $dirtypatch = 1; +} + +foreach my $f (@afiles) { + system('cvs', 'add', $f); + if ($?) { + $dirty = 1; + warn "Failed to cvs add $f -- you may need to do it manually"; + } +} + +foreach my $f (@dfiles) { + system('cvs', 'rm', '-f', $f); + if ($?) { + $dirty = 1; + warn "Failed to cvs rm -f $f -- you may need to do it manually"; + } +} + +print "Commit to CVS\n"; +my $commitfiles = join(' ', @afiles, @mfiles, @dfiles); +my $cmd = "cvs commit -F .msg $commitfiles"; + +if ($dirtypatch) { + print "NOTE: One or more hunks failed to apply cleanly.\n"; + print "Resolve the conflicts and then commit using:\n"; + print "\n $cmd\n\n"; + exit(1); +} + + +if ($opt_c) { + print "Autocommit\n $cmd\n"; + print safe_pipe_capture('cvs', 'commit', '-F', '.msg', @afiles, @mfiles, @dfiles); + if ($?) { + cleanupcvs(@files); + die "Exiting: The commit did not succeed"; + } + print "Committed successfully to CVS\n"; +} else { + print "Ready for you to commit, just run:\n\n $cmd\n"; +} +sub usage { + print STDERR <<END; +Usage: GIT_DIR=/path/to/.git ${\basename $0} [-h] [-p] [-v] [-c] [ parent ] commit +END + exit(1); +} + +# ensure cvs is clean before we die +sub cleanupcvs { + my @files = @_; + foreach my $f (@files) { + system('cvs', '-q', 'update', '-C', $f); + if ($?) { + warn "Warning! Failed to cleanup state of $f\n"; + } + } +} + +# An alterative to `command` that allows input to be passed as an array +# to work around shell problems with weird characters in arguments +# if the exec returns non-zero we die +sub safe_pipe_capture { + my @output; + if (my $pid = open my $child, '-|') { + @output = (<$child>); + close $child or die join(' ',@_).": $! $?"; + } else { + exec(@_) or die "$! $?"; # exec() can fail the executable can't be found + } + return wantarray ? @output : join('',@output); +} |