git-svn: Add 'find-rev' command

This patch adds a new 'find-rev' command to git-svn that lets you easily
translate between SVN revision numbers and git tree-ish.

Signed-off-by: Adam Roben <aroben@apple.com>
Acked-by: Eric Wong <normalperson@yhbt.net>
Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/Documentation/git-svn.txt b/Documentation/git-svn.txt
index a35b9de3bfde036391b0ac869bf927361d3d4c67..62d7ef8be4ef7d8f9f7c200db0e50bb732f5385e 100644 (file)
--- a/Documentation/git-svn.txt
+++ b/Documentation/git-svn.txt
@@ -161,8 +161,9 @@ Any other arguments are passed directly to `git log'
 --
 'find-rev'::
        When given an SVN revision number of the form 'rN', returns the
-       corresponding git commit hash.  When given a tree-ish, returns the
-       corresponding SVN revision number.
+       corresponding git commit hash (this can optionally be followed by a
+       tree-ish to specify which branch should be searched).  When given a
+       tree-ish, returns the corresponding SVN revision number.
 
 'set-tree'::
        You should consider using 'dcommit' instead of this command.

diff --git a/git-svn.perl b/git-svn.perl
index 6f509f85e45beb03ff9030ce76d36dbd23aefaee..6657e100fbbc3bd83e805b2440b1a7b61780c5f4 100755 (executable)
--- a/git-svn.perl
+++ b/git-svn.perl
@@ -434,17 +434,16 @@ sub cmd_find_rev {
        my $revision_or_hash = shift;
        my $result;
        if ($revision_or_hash =~ /^r\d+$/) {
-               my $desired_revision = substr($revision_or_hash, 1);
-               my ($fh, $ctx) = command_output_pipe('rev-list', 'HEAD');
-               while (my $hash = <$fh>) {
-                       chomp($hash);
-                       my (undef, $rev, undef) = cmt_metadata($hash);
-                       if ($rev && $rev eq $desired_revision) {
-                               $result = $hash;
-                               last;
-                       }
+               my $head = shift;
+               $head ||= 'HEAD';
+               my @refs;
+               my (undef, undef, undef, $gs) = working_head_info($head, \@refs);
+               unless ($gs) {
+                       die "Unable to determine upstream SVN information from ",
+                           "$head history\n";
                }
-               command_close_pipe($fh, $ctx);
+               my $desired_revision = substr($revision_or_hash, 1);
+               $result = $gs->rev_db_get($desired_revision);
        } else {
                my (undef, $rev, undef) = cmt_metadata($revision_or_hash);
                $result = $rev;