[PATCH 3/3] fetch: treat --tags like refs/tags/*:refs/tags/* when pruning

["Carlos Martín Nieto" <cmn@elego.de>]

If --tags is specified, add that refspec to the list given to prune_refs
so it knows to treat it as a filter on what refs to should consider
for prunning. This way

    git fetch --prune --tags origin

only prunes tags and doesn't delete the branch refs.

Signed-off-by: Carlos Martín Nieto <cmn@elego.de>
---
 builtin/fetch.c |   11 ++++++++++-
 1 files changed, 10 insertions(+), 1 deletions(-)

diff --git a/builtin/fetch.c b/builtin/fetch.c
index b937d71..94b2bd3 100644
--- a/builtin/fetch.c
+++ b/builtin/fetch.c
@@ -699,8 +699,17 @@ static int do_fetch(struct transport *transport,
 		free_refs(ref_map);
 		return 1;
 	}
-	if (prune)
+	if (prune) {
+		/* If --tags was specified, we need to tell prune_refs
+		 * that we're filtering the refs from the remote */
+		if (tags == TAGS_SET) {
+			const char * tags_refspec = "refs/tags/*:refs/tags/*";
+			refs = xrealloc(refs, (ref_count + 1) * sizeof(struct refspec));
+			refs[ref_count] = *parse_fetch_refspec(1, &tags_refspec);
+			ref_count++;
+		}
 		prune_refs(transport, refs, ref_count, ref_map);
+	}
 	free_refs(ref_map);
 
 	/* if neither --no-tags nor --tags was specified, do automated tag
-- 
1.7.5.2.354.g349bf