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https://github.com/git/git
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![Robin Rosenberg](/assets/img/avatar_default.png)
Signed-off-by: Robin Rosenberg <robin.rosenberg@dewire.com> Signed-off-by: Junio C Hamano <junkio@cox.net>
315 lines
8.2 KiB
Perl
Executable file
315 lines
8.2 KiB
Perl
Executable file
#!/usr/bin/perl -w
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# Known limitations:
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# - cannot add or remove binary files
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# - does not propagate permissions
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# - tells "ready for commit" even when things could not be completed
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# (eg addition of a binary file)
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use strict;
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use Getopt::Std;
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use File::Temp qw(tempdir);
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use Data::Dumper;
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use File::Basename qw(basename dirname);
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unless ($ENV{GIT_DIR} && -r $ENV{GIT_DIR}){
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die "GIT_DIR is not defined or is unreadable";
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}
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our ($opt_h, $opt_p, $opt_v, $opt_c, $opt_f, $opt_a, $opt_m );
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getopts('hpvcfam:');
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$opt_h && usage();
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die "Need at least one commit identifier!" unless @ARGV;
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# setup a tempdir
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our ($tmpdir, $tmpdirname) = tempdir('git-cvsapplycommit-XXXXXX',
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TMPDIR => 1,
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CLEANUP => 1);
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# resolve target commit
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my $commit;
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$commit = pop @ARGV;
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$commit = safe_pipe_capture('git-rev-parse', '--verify', "$commit^0");
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chomp $commit;
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if ($?) {
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die "The commit reference $commit did not resolve!";
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}
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# resolve what parent we want
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my $parent;
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if (@ARGV) {
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$parent = pop @ARGV;
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$parent = safe_pipe_capture('git-rev-parse', '--verify', "$parent^0");
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chomp $parent;
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if ($?) {
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die "The parent reference did not resolve!";
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}
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}
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# 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;
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my $author;
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my $stage = 'headers'; # headers, msg
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my $title;
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my $msg = '';
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foreach my $line (@commit) {
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chomp $line;
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if ($stage eq 'headers' && $line eq '') {
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$stage = 'msg';
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next;
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}
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if ($stage eq 'headers') {
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if ($line =~ m/^parent (\w{40})$/) { # found a parent
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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 = $1;
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}
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} else {
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$msg .= $line . "\n";
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unless ($title) {
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$title = $line;
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}
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}
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}
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if ($parent) {
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my $found;
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# double check that it's a valid parent
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foreach my $p (@parents) {
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if ($p eq $parent) {
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$found = 1;
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last;
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}; # found it
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}
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die "Did not find $parent in the parents for this commit!" if !$found;
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} else { # we don't have a parent from the cmdline...
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if (@parents == 1) { # it's safe to get it from the commit
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$parent = $parents[0];
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} else { # or perhaps not!
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die "This commit has more than one parent -- please name the parent you want to use explicitly";
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}
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}
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$opt_v && print "Applying to CVS commit $commit from parent $parent\n";
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# grab the commit message
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open(MSG, ">.msg") or die "Cannot open .msg for writing";
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if ($opt_m) {
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print MSG $opt_m;
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}
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print MSG $msg;
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if ($opt_a) {
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print MSG "\n\nAuthor: $author\n";
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if ($author ne $committer) {
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print MSG "Committer: $committer\n";
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}
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}
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close MSG;
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my (@afiles, @dfiles, @mfiles, @dirs);
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my @files = safe_pipe_capture('git-diff-tree', '-r', $parent, $commit);
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#print @files;
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$? && die "Error in git-diff-tree";
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foreach my $f (@files) {
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chomp $f;
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my @fields = split(m!\s+!, $f);
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if ($fields[4] eq 'A') {
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my $path = $fields[5];
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push @afiles, $path;
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# add any needed parent directories
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$path = dirname $path;
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while (!-d $path and ! grep { $_ eq $path } @dirs) {
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unshift @dirs, $path;
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$path = dirname $path;
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}
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}
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if ($fields[4] eq 'M') {
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push @mfiles, $fields[5];
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}
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if ($fields[4] eq 'D') {
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push @dfiles, $fields[5];
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}
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}
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$opt_v && print "The commit affects:\n ";
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$opt_v && print join ("\n ", @afiles,@mfiles,@dfiles) . "\n\n";
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undef @files; # don't need it anymore
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# check that the files are clean and up to date according to cvs
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my $dirty;
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foreach my $d (@dirs) {
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if (-e $d) {
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$dirty = 1;
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warn "$d exists and is not a directory!\n";
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}
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}
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foreach my $f (@afiles) {
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# This should return only one value
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my @status = grep(m/^File/, safe_pipe_capture('cvs', '-q', 'status' ,$f));
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if (@status > 1) { warn 'Strange! cvs status returned more than one line?'};
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if (-d dirname $f and $status[0] !~ m/Status: Unknown$/
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and $status[0] !~ m/^File: no file /) {
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$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: $status[0]\n";
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}
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}
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foreach my $f (@mfiles, @dfiles) {
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# TODO:we need to handle removed in cvs
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my @status = grep(m/^File/, safe_pipe_capture('cvs', '-q', 'status' ,$f));
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if (@status > 1) { warn 'Strange! cvs status returned more than one line?'};
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unless ($status[0] =~ m/Status: Up-to-date$/) {
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$dirty = 1;
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warn "File $f not up to date in your CVS checkout!\n";
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}
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}
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if ($dirty) {
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if ($opt_f) { warn "The tree is not clean -- forced merge\n";
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$dirty = 0;
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} else {
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die "Exiting: your CVS tree is not clean for this merge.";
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}
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}
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###
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### NOTE: if you are planning to die() past this point
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### you MUST call cleanupcvs(@files) before die()
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###
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print "Creating new directories\n";
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foreach my $d (@dirs) {
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unless (mkdir $d) {
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warn "Could not mkdir $d: $!";
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$dirty = 1;
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}
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`cvs add $d`;
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if ($?) {
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$dirty = 1;
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warn "Failed to cvs add directory $d -- you may need to do it manually";
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}
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}
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print "'Patching' binary files\n";
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my @bfiles = grep(m/^Binary/, safe_pipe_capture('git-diff-tree', '-p', $parent, $commit));
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@bfiles = map { chomp } @bfiles;
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foreach my $f (@bfiles) {
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# check that the file in cvs matches the "old" file
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# extract the file to $tmpdir and compare with cmp
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my $tree = safe_pipe_capture('git-rev-parse', "$parent^{tree}");
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chomp $tree;
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my $blob = `git-ls-tree $tree "$f" | cut -f 1 | cut -d ' ' -f 3`;
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chomp $blob;
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`git-cat-file blob $blob > $tmpdir/blob`;
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if (system('cmp', '-s', $f, "$tmpdir/blob")) {
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warn "Binary file $f in CVS does not match parent.\n";
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$dirty = 1;
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next;
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}
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# replace with the new file
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`git-cat-file blob $blob > $f`;
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# TODO: something smart with file modes
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}
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if ($dirty) {
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cleanupcvs(@files);
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die "Exiting: Binary files in CVS do not match parent";
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}
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## apply non-binary changes
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my $fuzz = $opt_p ? 0 : 2;
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print "Patching non-binary files\n";
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print `(git-diff-tree -p $parent -p $commit | patch -p1 -F $fuzz ) 2>&1`;
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my $dirtypatch = 0;
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if (($? >> 8) == 2) {
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cleanupcvs(@files);
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die "Exiting: Patch reported serious trouble -- you will have to apply this patch manually";
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} elsif (($? >> 8) == 1) { # some hunks failed to apply
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$dirtypatch = 1;
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}
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foreach my $f (@afiles) {
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system('cvs', 'add', $f);
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if ($?) {
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$dirty = 1;
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warn "Failed to cvs add $f -- you may need to do it manually";
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}
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}
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foreach my $f (@dfiles) {
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system('cvs', 'rm', '-f', $f);
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if ($?) {
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$dirty = 1;
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warn "Failed to cvs rm -f $f -- you may need to do it manually";
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}
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}
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print "Commit to CVS\n";
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print "Patch: $title\n";
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my $commitfiles = join(' ', @afiles, @mfiles, @dfiles);
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my $cmd = "cvs commit -F .msg $commitfiles";
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if ($dirtypatch) {
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print "NOTE: One or more hunks failed to apply cleanly.\n";
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print "Resolve the conflicts and then commit using:\n";
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print "\n $cmd\n\n";
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exit(1);
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}
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if ($opt_c) {
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print "Autocommit\n $cmd\n";
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print safe_pipe_capture('cvs', 'commit', '-F', '.msg', @afiles, @mfiles, @dfiles);
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if ($?) {
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cleanupcvs(@files);
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die "Exiting: The commit did not succeed";
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}
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print "Committed successfully to CVS\n";
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} else {
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print "Ready for you to commit, just run:\n\n $cmd\n";
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}
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sub usage {
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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
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exit(1);
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}
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# ensure cvs is clean before we die
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sub cleanupcvs {
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my @files = @_;
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foreach my $f (@files) {
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system('cvs', '-q', 'update', '-C', $f);
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if ($?) {
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warn "Warning! Failed to cleanup state of $f\n";
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}
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}
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}
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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
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# if the exec returns non-zero we die
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sub safe_pipe_capture {
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my @output;
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if (my $pid = open my $child, '-|') {
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@output = (<$child>);
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close $child or die join(' ',@_).": $! $?";
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} else {
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exec(@_) or die "$! $?"; # exec() can fail the executable can't be found
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}
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return wantarray ? @output : join('',@output);
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}
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