[thirdparty/git.git] / git-cvsexportcommit.perl

#!/usr/bin/perl -w

# Known limitations:
# - does not propagate permissions
# - tells "ready for commit" even when things could not be completed
#   (not sure this is true anymore, more testing is needed)
# - does not handle whitespace in pathnames at all.

use strict;
use Getopt::Std;
use File::Temp qw(tempdir);
use Data::Dumper;
use File::Basename qw(basename dirname);

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, $opt_f, $opt_a, $opt_m );

getopts('hpvcfam:');

$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);

# 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;
	}
    }
}

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;
} 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
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;

my (@afiles, @dfiles, @mfiles, @dirs);
my %amodes;
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];
	$amodes{$path} = $fields[1];
	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 'D') {
	push @dfiles, $fields[5];
    }
}
my (@binfiles, @abfiles, @dbfiles, @bfiles, @mbfiles);
@binfiles = grep m/^Binary files/, safe_pipe_capture('git-diff-tree', '-p', $parent, $commit);
map { chomp } @binfiles;
@abfiles = grep s/^Binary files \/dev\/null and b\/(.*) differ$/$1/, @binfiles;
@dbfiles = grep s/^Binary files a\/(.*) and \/dev\/null differ$/$1/, @binfiles;
@mbfiles = grep s/^Binary files a\/(.*) and b\/(.*) differ$/$1/, @binfiles;
push @bfiles, @abfiles;
push @bfiles, @dbfiles;
push @bfiles, @mbfiles;
push @mfiles, @mbfiles;

$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 $d (@dirs) {
    if (-e $d) {
	$dirty = 1;
	warn "$d exists and is not a directory!\n";
    }
}
foreach my $f (@afiles) {
    # This should return only one value
    if ($f =~ m,(.*)/[^/]*$,) {
	my $p = $1;
	next if (grep { $_ eq $p } @dirs);
    }
    my @status = grep(m/^File/,  safe_pipe_capture('cvs', '-q', 'status' ,$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;
	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[0]\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) {
    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.";
    }
}

###
### NOTE: if you are planning to die() past this point
###       you MUST call cleanupcvs(@files) before die()
###


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;
	warn "Failed to cvs add directory $d -- you may need to do it manually";
    }
}

print "'Patching' binary files\n";

foreach my $f (@bfiles) {
    # check that the file in cvs matches the "old" file
    # extract the file to $tmpdir and compare with cmp
    if (not(grep { $_ eq $f } @afiles)) {
        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";
	    if (not $opt_f) {
	        $dirty = 1;
		next;
	    }
        }
    }
    if (not(grep { $_ eq $f } @dfiles)) {
	my $tree = safe_pipe_capture('git-rev-parse', "$commit^{tree}");
	chomp $tree;
	my $blob = `git-ls-tree $tree "$f" | cut -f 1 | cut -d ' ' -f 3`;
	chomp $blob;
	# 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";

if (scalar(@afiles)+scalar(@dfiles)+scalar(@mfiles) != scalar(@bfiles)) {
    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 $f (@afiles) {
    set_new_file_permissions($f, $amodes{$f});
    if (grep { $_ eq $f } @bfiles) {
      system('cvs', 'add','-kb',$f);
    } else {
      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";
print "Patch: $title\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] [-f] [-m msgprefix] [ 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 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);
}

# For any file we want to add to cvs, we must first set its permissions
# properly, *before* the "cvs add ..." command.  Otherwise, it is impossible
# to change the permission of the file in the CVS repository using only cvs
# commands.  This should be fixed in cvs-1.12.14.
sub set_new_file_permissions {
    my ($file, $perm) = @_;
    chmod oct($perm), $file
      or die "failed to set permissions of \"$file\": $!\n";
}
Commit	Line	Data
5e0306ad ML	1	#!/usr/bin/perl -w
5e0306ad ML	2
0d71b31a	3	# Known limitations:
0d71b31a YD	4	# - does not propagate permissions
0d71b31a YD	5	# - tells "ready for commit" even when things could not be completed
fe142b3a RR	6	# (not sure this is true anymore, more testing is needed)
fe142b3a RR	7	# - does not handle whitespace in pathnames at all.
0d71b31a	8
5e0306ad ML	9	use strict;
	10	use Getopt::Std;
	11	use File::Temp qw(tempdir);
	12	use Data::Dumper;
3f0f756b	13	use File::Basename qw(basename dirname);
5e0306ad ML	14
	15	unless ($ENV{GIT_DIR} && -r $ENV{GIT_DIR}){
	16	die "GIT_DIR is not defined or is unreadable";
	17	}
	18
1b91abe3	19	our ($opt_h, $opt_p, $opt_v, $opt_c, $opt_f, $opt_a, $opt_m );
5e0306ad	20
1b91abe3	21	getopts('hpvcfam:');
5e0306ad ML	22
	23	$opt_h && usage();
	24
	25	die "Need at least one commit identifier!" unless @ARGV;
	26
	27	# setup a tempdir
	28	our ($tmpdir, $tmpdirname) = tempdir('git-cvsapplycommit-XXXXXX',
	29	TMPDIR => 1,
	30	CLEANUP => 1);
	31
5e0306ad ML	32	# resolve target commit
	33	my $commit;
	34	$commit = pop @ARGV;
d41df15e	35	$commit = safe_pipe_capture('git-rev-parse', '--verify', "$commit^0");
5e0306ad ML	36	chomp $commit;
	37	if ($?) {
	38	die "The commit reference $commit did not resolve!";
	39	}
	40
	41	# resolve what parent we want
	42	my $parent;
	43	if (@ARGV) {
	44	$parent = pop @ARGV;
d41df15e	45	$parent = safe_pipe_capture('git-rev-parse', '--verify', "$parent^0");
5e0306ad ML	46	chomp $parent;
	47	if ($?) {
	48	die "The parent reference did not resolve!";
	49	}
	50	}
	51
	52	# find parents from the commit itself
d41df15e	53	my @commit = safe_pipe_capture('git-cat-file', 'commit', $commit);
5e0306ad	54	my @parents;
1b91abe3 ML	55	my $committer;
	56	my $author;
	57	my $stage = 'headers'; # headers, msg
	58	my $title;
	59	my $msg = '';
	60
	61	foreach my $line (@commit) {
	62	chomp $line;
	63	if ($stage eq 'headers' && $line eq '') {
	64	$stage = 'msg';
	65	next;
5e0306ad	66	}
1b91abe3 ML	67
	68	if ($stage eq 'headers') {
	69	if ($line =~ m/^parent (\w{40})$/) { # found a parent
	70	push @parents, $1;
fe142b3a	71	} elsif ($line =~ m/^author (.+) \d+ [-+]\d+$/) {
1b91abe3	72	$author = $1;
fe142b3a	73	} elsif ($line =~ m/^committer (.+) \d+ [-+]\d+$/) {
1b91abe3 ML	74	$committer = $1;
	75	}
	76	} else {
	77	$msg .= $line . "\n";
	78	unless ($title) {
	79	$title = $line;
	80	}
5e0306ad ML	81	}
	82	}
	83
	84	if ($parent) {
135a522e	85	my $found;
5e0306ad ML	86	# double check that it's a valid parent
5e0306ad ML	87	foreach my $p (@parents) {
5e0306ad ML	88	if ($p eq $parent) {
	89	$found = 1;
	90	last;
	91	}; # found it
e09f5d7b	92	}
135a522e	93	die "Did not find $parent in the parents for this commit!" if !$found;
5e0306ad ML	94	} else { # we don't have a parent from the cmdline...
	95	if (@parents == 1) { # it's safe to get it from the commit
	96	$parent = $parents[0];
	97	} else { # or perhaps not!
	98	die "This commit has more than one parent -- please name the parent you want to use explicitly";
	99	}
	100	}
	101
	102	$opt_v && print "Applying to CVS commit $commit from parent $parent\n";
	103
	104	# grab the commit message
992793c8	105	open(MSG, ">.msg") or die "Cannot open .msg for writing";
1b91abe3 ML	106	if ($opt_m) {
	107	print MSG $opt_m;
	108	}
	109	print MSG $msg;
	110	if ($opt_a) {
	111	print MSG "\n\nAuthor: $author\n";
	112	if ($author ne $committer) {
	113	print MSG "Committer: $committer\n";
	114	}
	115	}
992793c8 ML	116	close MSG;
992793c8 ML	117
3f0f756b	118	my (@afiles, @dfiles, @mfiles, @dirs);
7c0f7028	119	my %amodes;
d41df15e	120	my @files = safe_pipe_capture('git-diff-tree', '-r', $parent, $commit);
992793c8	121	#print @files;
5e0306ad ML	122	$? && die "Error in git-diff-tree";
	123	foreach my $f (@files) {
	124	chomp $f;
d41df15e	125	my @fields = split(m!\s+!, $f);
5e0306ad	126	if ($fields[4] eq 'A') {
3f0f756b	127	my $path = $fields[5];
7c0f7028	128	$amodes{$path} = $fields[1];
3f0f756b YD	129	push @afiles, $path;
	130	# add any needed parent directories
	131	$path = dirname $path;
	132	while (!-d $path and ! grep { $_ eq $path } @dirs) {
	133	unshift @dirs, $path;
	134	$path = dirname $path;
	135	}
5e0306ad ML	136	}
	137	if ($fields[4] eq 'M') {
	138	push @mfiles, $fields[5];
	139	}
21ff2bdb	140	if ($fields[4] eq 'D') {
5e0306ad ML	141	push @dfiles, $fields[5];
	142	}
	143	}
fe142b3a RR	144	my (@binfiles, @abfiles, @dbfiles, @bfiles, @mbfiles);
	145	@binfiles = grep m/^Binary files/, safe_pipe_capture('git-diff-tree', '-p', $parent, $commit);
	146	map { chomp } @binfiles;
	147	@abfiles = grep s/^Binary files \/dev\/null and b\/(.*) differ$/$1/, @binfiles;
	148	@dbfiles = grep s/^Binary files a\/(.*) and \/dev\/null differ$/$1/, @binfiles;
	149	@mbfiles = grep s/^Binary files a\/(.) and b\/(.) differ$/$1/, @binfiles;
	150	push @bfiles, @abfiles;
	151	push @bfiles, @dbfiles;
	152	push @bfiles, @mbfiles;
	153	push @mfiles, @mbfiles;
	154
5e0306ad ML	155	$opt_v && print "The commit affects:\n ";
	156	$opt_v && print join ("\n ", @afiles,@mfiles,@dfiles) . "\n\n";
	157	undef @files; # don't need it anymore
	158
	159	# check that the files are clean and up to date according to cvs
	160	my $dirty;
3f0f756b YD	161	foreach my $d (@dirs) {
	162	if (-e $d) {
	163	$dirty = 1;
	164	warn "$d exists and is not a directory!\n";
	165	}
	166	}
576cfc86	167	foreach my $f (@afiles) {
d41df15e	168	# This should return only one value
fe142b3a RR	169	if ($f =~ m,(.)/[^/]$,) {
	170	my $p = $1;
	171	next if (grep { $_ eq $p } @dirs);
	172	}
d41df15e ML	173	my @status = grep(m/^File/, safe_pipe_capture('cvs', '-q', 'status' ,$f));
d41df15e ML	174	if (@status > 1) { warn 'Strange! cvs status returned more than one line?'};
3f0f756b YD	175	if (-d dirname $f and $status[0] !~ m/Status: Unknown$/
3f0f756b YD	176	and $status[0] !~ m/^File: no file /) {
d41df15e	177	$dirty = 1;
992793c8	178	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";
e9687515	179	warn "Status was: $status[0]\n";
576cfc86 YD	180	}
576cfc86 YD	181	}
fe142b3a	182
576cfc86 YD	183	foreach my $f (@mfiles, @dfiles) {
576cfc86 YD	184	# TODO:we need to handle removed in cvs
d41df15e ML	185	my @status = grep(m/^File/, safe_pipe_capture('cvs', '-q', 'status' ,$f));
	186	if (@status > 1) { warn 'Strange! cvs status returned more than one line?'};
	187	unless ($status[0] =~ m/Status: Up-to-date$/) {
5e0306ad ML	188	$dirty = 1;
	189	warn "File $f not up to date in your CVS checkout!\n";
	190	}
	191	}
	192	if ($dirty) {
992793c8 ML	193	if ($opt_f) { warn "The tree is not clean -- forced merge\n";
	194	$dirty = 0;
	195	} else {
	196	die "Exiting: your CVS tree is not clean for this merge.";
	197	}
5e0306ad ML	198	}
	199
	200	###
	201	### NOTE: if you are planning to die() past this point
	202	### you MUST call cleanupcvs(@files) before die()
	203	###
	204
	205
3f0f756b YD	206	print "Creating new directories\n";
	207	foreach my $d (@dirs) {
	208	unless (mkdir $d) {
	209	warn "Could not mkdir $d: $!";
	210	$dirty = 1;
	211	}
	212	`cvs add $d`;
	213	if ($?) {
	214	$dirty = 1;
	215	warn "Failed to cvs add directory $d -- you may need to do it manually";
	216	}
	217	}
	218
5e0306ad ML	219	print "'Patching' binary files\n";
5e0306ad ML	220
5e0306ad ML	221	foreach my $f (@bfiles) {
5e0306ad ML	222	# check that the file in cvs matches the "old" file
82e5a82f	223	# extract the file to $tmpdir and compare with cmp
fe142b3a RR	224	if (not(grep { $_ eq $f } @afiles)) {
	225	my $tree = safe_pipe_capture('git-rev-parse', "$parent^{tree}");
	226	chomp $tree;
	227	my $blob = `git-ls-tree $tree "$f" \| cut -f 1 \| cut -d ' ' -f 3`;
	228	chomp $blob;
	229	`git-cat-file blob $blob > $tmpdir/blob`;
	230	if (system('cmp', '-s', $f, "$tmpdir/blob")) {
	231	warn "Binary file $f in CVS does not match parent.\n";
	232	if (not $opt_f) {
	233	$dirty = 1;
	234	next;
	235	}
	236	}
	237	}
	238	if (not(grep { $_ eq $f } @dfiles)) {
	239	my $tree = safe_pipe_capture('git-rev-parse', "$commit^{tree}");
	240	chomp $tree;
	241	my $blob = `git-ls-tree $tree "$f" \| cut -f 1 \| cut -d ' ' -f 3`;
	242	chomp $blob;
	243	# replace with the new file
	244	`git-cat-file blob $blob > $f`;
5e0306ad	245	}
5e0306ad ML	246
	247	# TODO: something smart with file modes
	248
	249	}
	250	if ($dirty) {
	251	cleanupcvs(@files);
	252	die "Exiting: Binary files in CVS do not match parent";
	253	}
	254
	255	## apply non-binary changes
	256	my $fuzz = $opt_p ? 0 : 2;
	257
	258	print "Patching non-binary files\n";
fe142b3a RR	259
	260	if (scalar(@afiles)+scalar(@dfiles)+scalar(@mfiles) != scalar(@bfiles)) {
	261	print `(git-diff-tree -p $parent -p $commit \| patch -p1 -F $fuzz ) 2>&1`;
	262	}
5e0306ad ML	263
	264	my $dirtypatch = 0;
	265	if (($? >> 8) == 2) {
	266	cleanupcvs(@files);
	267	die "Exiting: Patch reported serious trouble -- you will have to apply this patch manually";
	268	} elsif (($? >> 8) == 1) { # some hunks failed to apply
	269	$dirtypatch = 1;
	270	}
	271
	272	foreach my $f (@afiles) {
7c0f7028	273	set_new_file_permissions($f, $amodes{$f});
fe142b3a RR	274	if (grep { $_ eq $f } @bfiles) {
	275	system('cvs', 'add','-kb',$f);
	276	} else {
	277	system('cvs', 'add', $f);
	278	}
5e0306ad ML	279	if ($?) {
	280	$dirty = 1;
	281	warn "Failed to cvs add $f -- you may need to do it manually";
	282	}
	283	}
	284
	285	foreach my $f (@dfiles) {
d41df15e	286	system('cvs', 'rm', '-f', $f);
5e0306ad ML	287	if ($?) {
	288	$dirty = 1;
	289	warn "Failed to cvs rm -f $f -- you may need to do it manually";
	290	}
	291	}
	292
	293	print "Commit to CVS\n";
1b91abe3	294	print "Patch: $title\n";
5e0306ad ML	295	my $commitfiles = join(' ', @afiles, @mfiles, @dfiles);
	296	my $cmd = "cvs commit -F .msg $commitfiles";
	297
	298	if ($dirtypatch) {
	299	print "NOTE: One or more hunks failed to apply cleanly.\n";
27dedf0c	300	print "Resolve the conflicts and then commit using:\n";
5e0306ad	301	print "\n $cmd\n\n";
27dedf0c	302	exit(1);
5e0306ad ML	303	}
	304
	305
	306	if ($opt_c) {
	307	print "Autocommit\n $cmd\n";
d41df15e	308	print safe_pipe_capture('cvs', 'commit', '-F', '.msg', @afiles, @mfiles, @dfiles);
5e0306ad ML	309	if ($?) {
	310	cleanupcvs(@files);
	311	die "Exiting: The commit did not succeed";
	312	}
	313	print "Committed successfully to CVS\n";
	314	} else {
	315	print "Ready for you to commit, just run:\n\n $cmd\n";
	316	}
	317	sub usage {
	318	print STDERR <<END;
992793c8	319	Usage: GIT_DIR=/path/to/.git ${\basename $0} [-h] [-p] [-v] [-c] [-f] [-m msgprefix] [ parent ] commit
5e0306ad ML	320	END
	321	exit(1);
	322	}
	323
	324	# ensure cvs is clean before we die
	325	sub cleanupcvs {
	326	my @files = @_;
	327	foreach my $f (@files) {
d41df15e	328	system('cvs', '-q', 'update', '-C', $f);
5e0306ad ML	329	if ($?) {
	330	warn "Warning! Failed to cleanup state of $f\n";
	331	}
	332	}
	333	}
	334
82e5a82f	335	# An alternative to `command` that allows input to be passed as an array
d41df15e ML	336	# to work around shell problems with weird characters in arguments
	337	# if the exec returns non-zero we die
	338	sub safe_pipe_capture {
	339	my @output;
	340	if (my $pid = open my $child, '-\|') {
	341	@output = (<$child>);
	342	close $child or die join(' ',@_).": $! $?";
	343	} else {
	344	exec(@_) or die "$! $?"; # exec() can fail the executable can't be found
	345	}
	346	return wantarray ? @output : join('',@output);
	347	}
7c0f7028 JM	348
	349	# For any file we want to add to cvs, we must first set its permissions
	350	# properly, before the "cvs add ..." command. Otherwise, it is impossible
	351	# to change the permission of the file in the CVS repository using only cvs
	352	# commands. This should be fixed in cvs-1.12.14.
	353	sub set_new_file_permissions {
	354	my ($file, $perm) = @_;
	355	chmod oct($perm), $file
	356	or die "failed to set permissions of \"$file\": $!\n";
	357	}