cvsimport: use rev-parse to support packed refs

Previously, if refs were packed, git-cvsimport would assume
that particular refs did not exist. This could lead to, for
example, overwriting previous 'origin' commits that were
packed.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/git-cvsimport.perl b/git-cvsimport.perl
index e4bc2b54f68930df217751975e32b4224f8d765c..a7a7d8f44df7b65f493d5a12fe3c7051f2c4b4a9 100755 (executable)
--- a/git-cvsimport.perl
+++ b/git-cvsimport.perl
@@ -526,18 +526,12 @@ sub is_sha1 {
        return $s =~ /^[a-f0-9]{40}$/;
 }
 
-sub get_headref ($$) {
-    my $name    = shift;
-    my $git_dir = shift;
-
-    my $f = "$git_dir/$remote/$name";
-    if (open(my $fh, $f)) {
-           chomp(my $r = <$fh>);
-           is_sha1($r) or die "Cannot get head id for $name ($r): $!";
-           return $r;
-    }
-    die "unable to open $f: $!" unless $! == POSIX::ENOENT;
-    return undef;
+sub get_headref ($) {
+       my $name = shift;
+       my $r = `git rev-parse --verify '$name' 2>/dev/null`;
+       return undef unless $? == 0;
+       chomp $r;
+       return $r;
 }
 
 -d $git_tree
@@ -697,7 +691,8 @@ my (@old,@new,@skipped,%ignorebranch);
 $ignorebranch{'#CVSPS_NO_BRANCH'} = 1;
 
 sub commit {
-       if ($branch eq $opt_o && !$index{branch} && !get_headref($branch, $git_dir)) {
+       if ($branch eq $opt_o && !$index{branch} &&
+               !get_headref("$remote/$branch")) {
            # looks like an initial commit
            # use the index primed by git-init
            $ENV{GIT_INDEX_FILE} = "$git_dir/index";
@@ -721,7 +716,7 @@ sub commit {
        update_index(@old, @new);
        @old = @new = ();
        my $tree = write_tree();
-       my $parent = get_headref($last_branch, $git_dir);
+       my $parent = get_headref("$remote/$last_branch");
        print "Parent ID " . ($parent ? $parent : "(empty)") . "\n" if $opt_v;
 
        my @commit_args;
@@ -732,7 +727,7 @@ sub commit {
        foreach my $rx (@mergerx) {
                next unless $logmsg =~ $rx && $1;
                my $mparent = $1 eq 'HEAD' ? $opt_o : $1;
-               if (my $sha1 = get_headref($mparent, $git_dir)) {
+               if (my $sha1 = get_headref("$remote/$mparent")) {
                        push @commit_args, '-p', $mparent;
                        print "Merge parent branch: $mparent\n" if $opt_v;
                }

diff --git a/t/t9600-cvsimport.sh b/t/t9600-cvsimport.sh
index 1ee06bb3863956ea5566558ef00ec18a2de357b1..3338d447c5b7b43ac274e6966ee693611f5e8056 100755 (executable)
--- a/t/t9600-cvsimport.sh
+++ b/t/t9600-cvsimport.sh
@@ -57,6 +57,8 @@ test_expect_success 'import a trivial module' '
 
 '
 
+test_expect_success 'pack refs' 'cd module-git && git gc && cd ..'
+
 test_expect_success 'update cvs module' '
 
        cd module-cvs &&