#!/usr/bin/perl -w
# Known limitations:
-# - cannot add or remove binary files
# - does not propagate permissions
-# - tells "ready for commit" even when things could not be completed
-# (eg addition of a binary file)
+# - error handling has not been extensively tested
+#
use strict;
use Getopt::Std;
die "GIT_DIR is not defined or is unreadable";
}
-our ($opt_h, $opt_p, $opt_v, $opt_c, $opt_f, $opt_m );
+our ($opt_h, $opt_P, $opt_p, $opt_v, $opt_c, $opt_f, $opt_a, $opt_m, $opt_d, $opt_u);
-getopts('hpvcfm:');
+getopts('uhPpvcfam:d:');
$opt_h && usage();
die "Need at least one commit identifier!" unless @ARGV;
+my @cvs;
+if ($opt_d) {
+ @cvs = ('cvs', '-d', $opt_d);
+} else {
+ @cvs = ('cvs');
+}
+
# setup a tempdir
our ($tmpdir, $tmpdirname) = tempdir('git-cvsapplycommit-XXXXXX',
TMPDIR => 1,
CLEANUP => 1);
-print Dumper(@ARGV);
# resolve target commit
my $commit;
$commit = pop @ARGV;
# 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;
+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 '') {
+ $stage = 'msg';
+ next;
}
- if ($p =~ m/^parent (\w{40})$/) { # found a parent
- push @parents, $1;
+
+ if ($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) {
- my $found;
if ($p eq $parent) {
$found = 1;
last;
}; # found it
- die "Did not find $parent in the parents for this commit!";
}
+ 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];
- } else { # or perhaps not!
- die "This commit has more than one parent -- please name the parent you want to use explicitly";
+ } 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";
}
}
# grab the commit message
open(MSG, ">.msg") or die "Cannot open .msg for writing";
-print MSG $opt_m;
+if ($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;
-`git-cat-file commit $commit | sed -e '1,/^\$/d' >> .msg`;
-$? && die "Error extracting the commit message";
+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";
+}
-my (@afiles, @dfiles, @mfiles, @dirs);
-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') {
- my $path = $fields[5];
- push @afiles, $path;
- # add any needed parent directories
- $path = dirname $path;
- while (!-d $path and ! grep { $_ eq $path } @dirs) {
- unshift @dirs, $path;
- $path = dirname $path;
- }
- }
- if ($fields[4] eq 'M') {
- push @mfiles, $fields[5];
- }
- if ($fields[4] eq 'R') {
- push @dfiles, $fields[5];
- }
+## 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 --binary --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,$1) if m/^ delete mode [0-7]+ (.*)$/;
}
-$opt_v && print "The commit affects:\n ";
-$opt_v && print join ("\n ", @afiles,@mfiles,@dfiles) . "\n\n";
-undef @files; # don't need it anymore
+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 = safe_pipe_capture(@cvs, 'update', @canstatusfiles);
+ print @updated;
+ }
+ 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++;
+ }
+ }
+}
+
+# ... validate new files,
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?'};
- if (-d dirname $f and $status[0] !~ m/Status: Unknown$/
- and $status[0] !~ m/^File: no file /) {
- $dirty = 1;
+ if (defined ($cvsstat{$f}) and $cvsstat{$f} ne "Unknown") {
+ $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: $status\n";
+ warn "Status was: $cvsstat{$f}\n";
}
}
-foreach my $f (@mfiles, @dfiles) {
+# ... validate known files.
+foreach my $f (@files) {
+ next if grep { $_ eq $f } @afiles;
# TODO:we need to handle removed in cvs
- my @status = grep(m/^File/, safe_pipe_capture('cvs', '-q', 'status' ,$f));
- if (@status > 1) { warn 'Strange! cvs status returned more than one line?'};
- unless ($status[0] =~ m/Status: Up-to-date$/) {
+ unless (defined ($cvsstat{$f}) and $cvsstat{$f} eq "Up-to-date") {
$dirty = 1;
- warn "File $f not up to date in your CVS checkout!\n";
+ warn "File $f not up to date but has status '$cvsstat{$f}' in your CVS checkout!\n";
}
}
if ($dirty) {
}
}
-###
-### NOTE: if you are planning to die() past this point
-### you MUST call cleanupcvs(@files) before die()
-###
+print "Applying\n";
+`GIT_DIR= git-apply $context --binary --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;
-print "Creating new directories\n";
foreach my $d (@dirs) {
- unless (mkdir $d) {
- warn "Could not mkdir $d: $!";
- $dirty = 1;
- }
- `cvs add $d`;
- if ($?) {
- $dirty = 1;
+ if (system(@cvs,'add',$d)) {
+ $dirtypatch = 1;
warn "Failed to cvs add directory $d -- you may need to do it manually";
}
}
-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', '-s', $f, "$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 (grep { $_ eq $f } @bfiles) {
+ system(@cvs, 'add','-kb',$f);
+ } else {
+ system(@cvs, 'add', $f);
+ }
if ($?) {
- $dirty = 1;
+ $dirtypatch = 1;
warn "Failed to cvs add $f -- you may need to do it manually";
}
}
foreach my $f (@dfiles) {
- system('cvs', 'rm', '-f', $f);
+ system(@cvs, 'rm', '-f', $f);
if ($?) {
- $dirty = 1;
+ $dirtypatch = 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";
+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 "Resolve the conflicts and then commit using:\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 $cmd\n\n";
exit(1);
}
-
if ($opt_c) {
print "Autocommit\n $cmd\n";
- print safe_pipe_capture('cvs', 'commit', '-F', '.msg', @afiles, @mfiles, @dfiles);
+ print safe_pipe_capture(@cvs, 'commit', '-F', '.msg', @files);
if ($?) {
- cleanupcvs(@files);
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");
+
+# 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 ${\basename $0} [-h] [-p] [-v] [-c] [-f] [-m msgprefix] [ parent ] commit
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
+# 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 {
}
return wantarray ? @output : join('',@output);
}
+
+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;
+}