pack-objects --unpacked=<existing pack> option.

Incremental repack without -a essentially boils down to:

	rev-list --objects --unpacked --all |
        pack-objects $new_pack

which picks up all loose objects that are still live and creates
a new pack.

This implements --unpacked=<existing pack> option to tell the
revision walking machinery to pretend as if objects in such a
pack are unpacked for the purpose of object listing.  With this,
we could say:

	rev-list --objects --unpacked=$active_pack --all |
	pack-objects $new_pack

instead, to mean "all live loose objects but pretend as if
objects that are in this pack are also unpacked".  The newly
created pack would be perfect for updating $active_pack by
replacing it.

Since pack-objects now knows how to do the rev-list's work
itself internally, you can also write the above example by:

	pack-objects --unpacked=$active_pack --all $new_pack </dev/null

Signed-off-by: Junio C Hamano <junkio@cox.net>

1 files changed, 5 insertions, 1 deletions

diff --git a/revision.h b/revision.h
index c1f71afe6f..a5c35d05cb 100644
--- a/revision.h
+++ b/revision.h
@@ -38,7 +38,7 @@ struct rev_info {
 			blob_objects:1,
 			edge_hint:1,
 			limited:1,
-			unpacked:1,
+			unpacked:1, /* see also ignore_packed below */
 			boundary:1,
 			parents:1;
 
@@ -57,6 +57,10 @@ struct rev_info {
 	unsigned int	shown_one:1,
 			abbrev_commit:1,
 			relative_date:1;
+
+	const char **ignore_packed; /* pretend objects in these are unpacked */
+	int num_ignore_packed;
+
 	unsigned int	abbrev;
 	enum cmit_fmt	commit_format;
 	struct log_info *loginfo;