[PATCH] cvsimport move over to using git for each ref to read refs V3

[Andy Whitcroft <apw@xxxxxxxxxxxx>]

cvsimport: move over to using git-for-each-ref to read refs V3

cvsimport opens all of the files in $GIT_DIR/refs/heads and reads
out the sha1's in order to work out what time the last commit on
that branch was made (in CVS) thus allowing incremental updates.
However, this takes no account of hierachical refs naming producing
the following error for each directory in $GIT_DIR/refs:

  Use of uninitialized value in chomp at /usr/bin/git-cvsimport line 503.
  Use of uninitialized value in concatenation (.) or string at
					/usr/bin/git-cvsimport line 505.
  usage: git-cat-file [-t|-s|-e|-p|<type>] <sha1>

Take advantage of the new packed refs work to use the new
for-each-ref iterator to get this information.

Signed-off-by: Andy Whitcroft <apw@xxxxxxxxxxxx>
---
diff --git a/git-cvsimport.perl b/git-cvsimport.perl
index e5a00a1..92d14c3 100755
--- a/git-cvsimport.perl
+++ b/git-cvsimport.perl
@@ -495,22 +495,19 @@ unless(-d $git_dir) {
 	$tip_at_start = `git-rev-parse --verify HEAD`;
 
 	# Get the last import timestamps
-	opendir(D,"$git_dir/refs/heads");
-	while(defined(my $head = readdir(D))) {
-		next if $head =~ /^\./;
-		open(F,"$git_dir/refs/heads/$head")
-			or die "Bad head branch: $head: $!\n";
-		chomp(my $ftag = <F>);
-		close(F);
-		open(F,"git-cat-file commit $ftag |");
-		while(<F>) {
-			next unless /^author\s.*\s(\d+)\s[-+]\d{4}$/;
-			$branch_date{$head} = $1;
-			last;
-		}
-		close(F);
+	my $fmt = '($ref, $author) = (%(refname), %(author));';
+	open(H, "git-for-each-ref --perl --format='$fmt'|") or
+		die "Cannot run git-for-each-ref: $!\n";
+	while(defined(my $entry = <H>)) {
+		my ($ref, $author);
+		eval($entry) || die "cannot eval refs list: $@";
+
+		next if ($ref !~ m@^refs/heads/(.*)$@);
+		my ($head) = ($1);
+		$author =~ /^.*\s(\d+)\s[-+]\d{4}$/;
+		$branch_date{$head} = $1;
 	}
-	closedir(D);
+	close(H);
 }
 
 -d $git_dir
-
To unsubscribe from this list: send the line "unsubscribe git" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html