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executable file 247 lines (213 sloc) 6.635 kb
#!/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);
}
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