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#!/usr/bin/perl -w
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# Known limitations:
# - does not propagate permissions
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# - error handling has not been extensively tested
#
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use strict;
use Getopt::Std;
use File::Temp qw(tempdir);
use Data::Dumper;
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use File::Basename qw(basename dirname);
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unless ($ENV{GIT_DIR} && -r $ENV{GIT_DIR}){
die "GIT_DIR is not defined or is unreadable";
}
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our ($opt_h, $opt_P, $opt_p, $opt_v, $opt_c, $opt_f, $opt_a, $opt_m, $opt_d, $opt_u);
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getopts('uhPpvcfam:d:');
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$opt_h && usage();
die "Need at least one commit identifier!" unless @ARGV;
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my @cvs;
if ($opt_d) {
@cvs = ('cvs', '-d', $opt_d);
} else {
@cvs = ('cvs');
}
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# resolve target commit
my $commit;
$commit = pop @ARGV;
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$commit = safe_pipe_capture('git-rev-parse', '--verify', "$commit^0");
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chomp $commit;
if ($?) {
die "The commit reference $commit did not resolve!";
}
# resolve what parent we want
my $parent;
if (@ARGV) {
$parent = pop @ARGV;
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$parent = safe_pipe_capture('git-rev-parse', '--verify', "$parent^0");
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chomp $parent;
if ($?) {
die "The parent reference did not resolve!";
}
}
# find parents from the commit itself
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my @commit = safe_pipe_capture('git-cat-file', 'commit', $commit);
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my @parents;
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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 '') {
$stage = 'msg';
next;
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}
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if ($stage eq 'headers') {
if ($line =~ m/^parent (\w{40})$/) { # found a parent
push @parents, $1;
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} elsif ($line =~ m/^author (.+) \d+ [-+]\d+$/) {
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$author = $1;
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} elsif ($line =~ m/^committer (.+) \d+ [-+]\d+$/) {
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$committer = $1;
}
} else {
$msg .= $line . "\n";
unless ($title) {
$title = $line;
}
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}
}
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my $noparent = "0000000000000000000000000000000000000000";
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if ($parent) {
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my $found;
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# double check that it's a valid parent
foreach my $p (@parents) {
if ($p eq $parent) {
$found = 1;
last;
}; # found it
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}
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die "Did not find $parent in the parents for this commit!" if !$found and !$opt_P;
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} 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];
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} 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";
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}
}
$opt_v && print "Applying to CVS commit $commit from parent $parent\n";
# grab the commit message
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open(MSG, ">.msg") or die "Cannot open .msg for writing";
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if ($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: $committer\n";
}
}
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close MSG;
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if ($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";
}
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## apply non-binary changes
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# 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';
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print "Checking if patch will apply\n";
my @stat;
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open APPLY, "GIT_DIR= git-apply $context --summary --numstat<.cvsexportcommit.diff|" || die "cannot patch";
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@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,$1) if m/^ delete mode [0-7]+ (.*)$/;
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}
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map { s/^"(.*)"$/$1/g } @bfiles,@files;
map { s/\\([0-7]{3})/sprintf('%c',oct $1)/eg } @bfiles,@files;
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# check that the files are clean and up to date according to cvs
my $dirty;
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my @dirs;
foreach my $p (@afiles) {
my $path = dirname $p;
while (!-d $path and ! grep { $_ eq $path } @dirs) {
unshift @dirs, $path;
$path = dirname $path;
}
}
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# ... check dirs,
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foreach my $d (@dirs) {
if (-e $d) {
$dirty = 1;
warn "$d exists and is not a directory!\n";
}
}
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# ... 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, $f;
}
my %cvsstat;
if (@canstatusfiles) {
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if ($opt_u) {
my @updated = safe_pipe_capture(@cvs, 'update', @canstatusfiles);
print @updated;
}
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my @cvsoutput;
@cvsoutput= safe_pipe_capture(@cvs, 'status', @canstatusfiles);
my $matchcount = 0;
foreach my $l (@cvsoutput) {
chomp $l;
if ( $l =~ /^File:/ and $l =~ /Status: (.*)$/ ) {
$cvsstat{$canstatusfiles[$matchcount]} = $1;
$matchcount++;
}
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}
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}
# ... validate new files,
foreach my $f (@afiles) {
if (defined ($cvsstat{$f}) and $cvsstat{$f} ne "Unknown") {
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$dirty = 1;
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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";
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warn "Status was: $cvsstat{$f}\n";
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}
}
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# ... validate known files.
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foreach my $f (@files) {
next if grep { $_ eq $f } @afiles;
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# TODO:we need to handle removed in cvs
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unless (defined ($cvsstat{$f}) and $cvsstat{$f} eq "Up-to-date") {
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$dirty = 1;
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warn "File $f not up to date but has status '$cvsstat{$f}' in your CVS checkout!\n";
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}
}
if ($dirty) {
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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.";
}
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}
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print "Applying\n";
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`GIT_DIR= git-apply $context --summary --numstat --apply <.cvsexportcommit.diff` || die "cannot patch";
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print "Patch applied successfully. Adding new files and directories to CVS\n";
my $dirtypatch = 0;
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#
# 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;
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foreach my $d (@dirs) {
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if (system(@cvs,'add',$d)) {
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$dirtypatch = 1;
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warn "Failed to cvs add directory $d -- you may need to do it manually";
}
}
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foreach my $f (@afiles) {
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if (grep { $_ eq $f } @bfiles) {
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system(@cvs, 'add','-kb',$f);
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} else {
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system(@cvs, 'add', $f);
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}
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if ($?) {
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$dirtypatch = 1;
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warn "Failed to cvs add $f -- you may need to do it manually";
}
}
foreach my $f (@dfiles) {
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system(@cvs, 'rm', '-f', $f);
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if ($?) {
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$dirtypatch = 1;
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warn "Failed to cvs rm -f $f -- you may need to do it manually";
}
}
print "Commit to CVS\n";
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print "Patch title (first comment line): $title\n";
my @commitfiles = map { unless (m/\s/) { '\''.$_.'\''; } else { $_; }; } (@files);
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my $cmd = join(' ', @cvs)." commit -F .msg @commitfiles";
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if ($dirtypatch) {
print "NOTE: One or more hunks failed to apply cleanly.\n";
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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:";
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print "\n $cmd\n\n";
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exit(1);
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}
if ($opt_c) {
print "Autocommit\n $cmd\n";
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print safe_pipe_capture(@cvs, 'commit', '-F', '.msg', @files);
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if ($?) {
die "Exiting: The commit did not succeed";
}
print "Committed successfully to CVS\n";
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# clean up
unlink(".msg");
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} else {
print "Ready for you to commit, just run:\n\n $cmd\n";
}
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# clean up
unlink(".cvsexportcommit.diff");
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# 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);
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sub usage {
print STDERR <<END;
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Usage: GIT_DIR=/path/to/.git ${\basename $0} [-h] [-p] [-v] [-c] [-f] [-m msgprefix] [ parent ] commit
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END
exit(1);
}
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# An alternative to `command` that allows input to be passed as an array
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# 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);
}
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sub safe_pipe_capture_blob {
my $output;
if (my $pid = open my $child, '-|') {
local $/;
undef $/;
$output = (<$child>);
close $child or die join(' ',@_).": $! $?";
} else {
exec(@_) or die "$! $?"; # exec() can fail the executable can't be found
}
return $output;
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}