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Diffstat (limited to 'git-cvsexportcommit.perl')
| -rwxr-xr-x | git-cvsexportcommit.perl | 455 |
1 files changed, 455 insertions, 0 deletions
diff --git a/git-cvsexportcommit.perl b/git-cvsexportcommit.perl new file mode 100755 index 0000000000..39a426e067 --- /dev/null +++ b/git-cvsexportcommit.perl @@ -0,0 +1,455 @@ +#!/usr/bin/perl + +use 5.008; +use strict; +use warnings; +use Getopt::Std; +use File::Temp qw(tempdir); +use Data::Dumper; +use File::Basename qw(basename dirname); +use File::Spec; +use Git; + +our ($opt_h, $opt_P, $opt_p, $opt_v, $opt_c, $opt_f, $opt_a, $opt_m, $opt_d, $opt_u, $opt_w, $opt_W, $opt_k); + +getopts('uhPpvcfkam:d:w:W'); + +$opt_h && usage(); + +die "Need at least one commit identifier!" unless @ARGV; + +# Get git-config settings +my $repo = Git->repository(); +$opt_w = $repo->config('cvsexportcommit.cvsdir') unless defined $opt_w; + +if ($opt_w || $opt_W) { + # Remember where GIT_DIR is before changing to CVS checkout + unless ($ENV{GIT_DIR}) { + # No GIT_DIR set. Figure it out for ourselves + my $gd =`git-rev-parse --git-dir`; + chomp($gd); + $ENV{GIT_DIR} = $gd; + } + # Make sure GIT_DIR is absolute + $ENV{GIT_DIR} = File::Spec->rel2abs($ENV{GIT_DIR}); +} + +if ($opt_w) { + if (! -d $opt_w."/CVS" ) { + die "$opt_w is not a CVS checkout"; + } + chdir $opt_w or die "Cannot change to CVS checkout at $opt_w"; +} +unless ($ENV{GIT_DIR} && -r $ENV{GIT_DIR}){ + die "GIT_DIR is not defined or is unreadable"; +} + + +my @cvs; +if ($opt_d) { + @cvs = ('cvs', '-d', $opt_d); +} else { + @cvs = ('cvs'); +} + +# 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; +my $committer; +my $author; +my $stage = 'headers'; # headers, msg +my $title; +my $msg = ''; + +foreach my $line (@commit) { + chomp $line; + if ($stage eq 'headers' && $line eq '') { + $stage = 'msg'; + next; + } + + if ($stage eq 'headers') { + if ($line =~ m/^parent (\w{40})$/) { # found a parent + push @parents, $1; + } elsif ($line =~ m/^author (.+) \d+ [-+]\d+$/) { + $author = $1; + } elsif ($line =~ m/^committer (.+) \d+ [-+]\d+$/) { + $committer = $1; + } + } else { + $msg .= $line . "\n"; + unless ($title) { + $title = $line; + } + } +} + +my $noparent = "0000000000000000000000000000000000000000"; +if ($parent) { + my $found; + # double check that it's a valid parent + foreach my $p (@parents) { + if ($p eq $parent) { + $found = 1; + last; + }; # found it + } + die "Did not find $parent in the parents for this commit!" if !$found and !$opt_P; +} 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]; + } elsif (@parents == 0) { # there is no parent + $parent = $noparent; + } else { # cannot choose automatically from multiple parents + die "This commit has more than one parent -- please name the parent you want to use explicitly"; + } +} + +my $go_back_to = 0; + +if ($opt_W) { + $opt_v && print "Resetting to $parent\n"; + $go_back_to = `git symbolic-ref HEAD 2> /dev/null || + git rev-parse HEAD` || die "Could not determine current branch"; + system("git checkout -q $parent^0") && die "Could not check out $parent^0"; +} + +$opt_v && print "Applying to CVS commit $commit from parent $parent\n"; + +# grab the commit message +open(MSG, ">.msg") or die "Cannot open .msg for writing"; +if ($opt_m) { + print MSG $opt_m; +} +print MSG $msg; +if ($opt_a) { + print MSG "\n\nAuthor: $author\n"; + if ($author ne $committer) { + print MSG "Committer: $committer\n"; + } +} +close MSG; + +if ($parent eq $noparent) { + `git-diff-tree --binary -p --root $commit >.cvsexportcommit.diff`;# || die "Cannot diff"; +} else { + `git-diff-tree --binary -p $parent $commit >.cvsexportcommit.diff`;# || die "Cannot diff"; +} + +## apply non-binary changes + +# In pedantic mode require all lines of context to match. In normal +# mode, be compatible with diff/patch: assume 3 lines of context and +# require at least one line match, i.e. ignore at most 2 lines of +# context, like diff/patch do by default. +my $context = $opt_p ? '' : '-C1'; + +print "Checking if patch will apply\n"; + +my @stat; +open APPLY, "GIT_DIR= git-apply $context --summary --numstat<.cvsexportcommit.diff|" || die "cannot patch"; +@stat=<APPLY>; +close APPLY || die "Cannot patch"; +my (@bfiles,@files,@afiles,@dfiles); +chomp @stat; +foreach (@stat) { + push (@bfiles,$1) if m/^-\t-\t(.*)$/; + push (@files, $1) if m/^-\t-\t(.*)$/; + push (@files, $1) if m/^\d+\t\d+\t(.*)$/; + push (@afiles,$1) if m/^ create mode [0-7]+ (.*)$/; + push (@dfiles,$1) if m/^ delete mode [0-7]+ (.*)$/; +} +map { s/^"(.*)"$/$1/g } @bfiles,@files; +map { s/\\([0-7]{3})/sprintf('%c',oct $1)/eg } @bfiles,@files; + +# check that the files are clean and up to date according to cvs +my $dirty; +my @dirs; +foreach my $p (@afiles) { + my $path = dirname $p; + while (!-d $path and ! grep { $_ eq $path } @dirs) { + unshift @dirs, $path; + $path = dirname $path; + } +} + +# ... check dirs, +foreach my $d (@dirs) { + if (-e $d) { + $dirty = 1; + warn "$d exists and is not a directory!\n"; + } +} + +# ... query status of all files that we have a directory for and parse output of 'cvs status' to %cvsstat. +my @canstatusfiles; +foreach my $f (@files) { + my $path = dirname $f; + next if (grep { $_ eq $path } @dirs); + push @canstatusfiles, $f; +} + +my %cvsstat; +if (@canstatusfiles) { + if ($opt_u) { + my @updated = xargs_safe_pipe_capture([@cvs, 'update'], @canstatusfiles); + print @updated; + } + # "cvs status" reorders the parameters, notably when there are multiple + # arguments with the same basename. So be precise here. + + my %added = map { $_ => 1 } @afiles; + my %todo = map { $_ => 1 } @canstatusfiles; + + while (%todo) { + my @canstatusfiles2 = (); + my %fullname = (); + foreach my $name (keys %todo) { + my $basename = basename($name); + + # CVS reports files that don't exist in the current revision as + # "no file $basename" in its "status" output, so we should + # anticipate that. Totally unknown files will have a status + # "Unknown". However, if they exist in the Attic, their status + # will be "Up-to-date" (this means they were added once but have + # been removed). + $basename = "no file $basename" if $added{$basename}; + + $basename =~ s/^\s+//; + $basename =~ s/\s+$//; + + if (!exists($fullname{$basename})) { + $fullname{$basename} = $name; + push (@canstatusfiles2, $name); + delete($todo{$name}); + } + } + my @cvsoutput; + @cvsoutput = xargs_safe_pipe_capture([@cvs, 'status'], @canstatusfiles2); + foreach my $l (@cvsoutput) { + chomp $l; + next unless + my ($file, $status) = $l =~ /^File:\s+(.*\S)\s+Status: (.*)$/; + + my $fullname = $fullname{$file}; + print STDERR "Huh? Status '$status' reported for unexpected file '$file'\n" + unless defined $fullname; + + # This response means the file does not exist except in + # CVS's attic, so set the status accordingly + $status = "In-attic" + if $file =~ /^no file / + && $status eq 'Up-to-date'; + + $cvsstat{$fullname{$file}} = $status + if defined $fullname{$file}; + } + } +} + +# ... Validate that new files have the correct status +foreach my $f (@afiles) { + next unless defined(my $stat = $cvsstat{$f}); + + # This means the file has never been seen before + next if $stat eq 'Unknown'; + + # This means the file has been seen before but was removed + next if $stat eq 'In-attic'; + + $dirty = 1; + warn "File $f is already known in your CVS checkout -- perhaps it has been added by another user. Or this may indicate that it exists on a different branch. If this is the case, use -f to force the merge.\n"; + warn "Status was: $cvsstat{$f}\n"; +} + +# ... validate known files. +foreach my $f (@files) { + next if grep { $_ eq $f } @afiles; + # TODO:we need to handle removed in cvs + unless (defined ($cvsstat{$f}) and $cvsstat{$f} eq "Up-to-date") { + $dirty = 1; + warn "File $f not up to date but has status '$cvsstat{$f}' in your CVS checkout!\n"; + } + + # Depending on how your GIT tree got imported from CVS you may + # have a conflict between expanded keywords in your CVS tree and + # unexpanded keywords in the patch about to be applied. + if ($opt_k) { + my $orig_file ="$f.orig"; + rename $f, $orig_file; + open(FILTER_IN, "<$orig_file") or die "Cannot open $orig_file\n"; + open(FILTER_OUT, ">$f") or die "Cannot open $f\n"; + while (<FILTER_IN>) + { + my $line = $_; + $line =~ s/\$([A-Z][a-z]+):[^\$]+\$/\$$1\$/g; + print FILTER_OUT $line; + } + close FILTER_IN; + close FILTER_OUT; + } +} + +if ($dirty) { + if ($opt_f) { warn "The tree is not clean -- forced merge\n"; + $dirty = 0; + } else { + die "Exiting: your CVS tree is not clean for this merge."; + } +} + +print "Applying\n"; +if ($opt_W) { + system("git checkout -q $commit^0") && die "cannot patch"; +} else { + `GIT_DIR= git-apply $context --summary --numstat --apply <.cvsexportcommit.diff` || die "cannot patch"; +} + +print "Patch applied successfully. Adding new files and directories to CVS\n"; +my $dirtypatch = 0; + +# +# We have to add the directories in order otherwise we will have +# problems when we try and add the sub-directory of a directory we +# have not added yet. +# +# Luckily this is easy to deal with by sorting the directories and +# dealing with the shortest ones first. +# +@dirs = sort { length $a <=> length $b} @dirs; + +foreach my $d (@dirs) { + if (system(@cvs,'add',$d)) { + $dirtypatch = 1; + warn "Failed to cvs add directory $d -- you may need to do it manually"; + } +} + +foreach my $f (@afiles) { + if (grep { $_ eq $f } @bfiles) { + system(@cvs, 'add','-kb',$f); + } else { + system(@cvs, 'add', $f); + } + if ($?) { + $dirtypatch = 1; + warn "Failed to cvs add $f -- you may need to do it manually"; + } +} + +foreach my $f (@dfiles) { + system(@cvs, 'rm', '-f', $f); + if ($?) { + $dirtypatch = 1; + warn "Failed to cvs rm -f $f -- you may need to do it manually"; + } +} + +print "Commit to CVS\n"; +print "Patch title (first comment line): $title\n"; +my @commitfiles = map { unless (m/\s/) { '\''.$_.'\''; } else { $_; }; } (@files); +my $cmd = join(' ', @cvs)." commit -F .msg @commitfiles"; + +if ($dirtypatch) { + print "NOTE: One or more hunks failed to apply cleanly.\n"; + print "You'll need to apply the patch in .cvsexportcommit.diff manually\n"; + print "using a patch program. After applying the patch and resolving the\n"; + print "problems you may commit using:"; + print "\n cd \"$opt_w\"" if $opt_w; + print "\n $cmd\n"; + print "\n git checkout $go_back_to\n" if $go_back_to; + print "\n"; + exit(1); +} + +if ($opt_c) { + print "Autocommit\n $cmd\n"; + print xargs_safe_pipe_capture([@cvs, 'commit', '-F', '.msg'], @files); + if ($?) { + die "Exiting: The commit did not succeed"; + } + print "Committed successfully to CVS\n"; + # clean up + unlink(".msg"); +} else { + print "Ready for you to commit, just run:\n\n $cmd\n"; +} + +# clean up +unlink(".cvsexportcommit.diff"); + +if ($opt_W) { + system("git checkout $go_back_to") && die "cannot move back to $go_back_to"; + if (!($go_back_to =~ /^[0-9a-fA-F]{40}$/)) { + system("git symbolic-ref HEAD $go_back_to") && + die "cannot move back to $go_back_to"; + } +} + +# CVS version 1.11.x and 1.12.x sleeps the wrong way to ensure the timestamp +# used by CVS and the one set by subsequence file modifications are different. +# If they are not different CVS will not detect changes. +sleep(1); + +sub usage { + print STDERR <<END; +Usage: GIT_DIR=/path/to/.git git cvsexportcommit [-h] [-p] [-v] [-c] [-f] [-u] [-k] [-w cvsworkdir] [-m msgprefix] [ parent ] commit +END + exit(1); +} + +# An alternative 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); +} + +sub xargs_safe_pipe_capture { + my $MAX_ARG_LENGTH = 65536; + my $cmd = shift; + my @output; + my $output; + while(@_) { + my @args; + my $length = 0; + while(@_ && $length < $MAX_ARG_LENGTH) { + push @args, shift; + $length += length($args[$#args]); + } + if (wantarray) { + push @output, safe_pipe_capture(@$cmd, @args); + } + else { + $output .= safe_pipe_capture(@$cmd, @args); + } + } + return wantarray ? @output : $output; +} |