[PATCH 6/6] builtin-remote: prune remotes correctly that were added with --mirror

[Johannes Schindelin <Johannes.Schindelin@gmx.de>]

This adds special handling for mirror remotes.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
 builtin-remote.c  |   15 +++++++++++++--
 t/t5505-remote.sh |   16 ++++++++++++++++
 2 files changed, 29 insertions(+), 2 deletions(-)

diff --git a/builtin-remote.c b/builtin-remote.c
index 2c10df3..221d2d6 100644
--- a/builtin-remote.c
+++ b/builtin-remote.c
@@ -396,11 +396,22 @@ static int show_or_prune(int argc, const char **argv, int prune)
 
 		if (prune) {
 			struct strbuf buf;
+			int prefix_len;
 
 			strbuf_init(&buf, 0);
+			if (states.remote->fetch_refspec_nr == 1 &&
+					states.remote->fetch->pattern &&
+					!strcmp(states.remote->fetch->src,
+						states.remote->fetch->dst))
+				/* handle --mirror remote */
+				strbuf_addstr(&buf, "refs/heads/");
+			else
+				strbuf_addf(&buf, "refs/remotes/%s/", *argv);
+			prefix_len = buf.len;
+
 			for (i = 0; i < states.stale.nr; i++) {
-				strbuf_reset(&buf);
-				strbuf_addf(&buf, "refs/remotes/%s/%s", *argv,
+				strbuf_setlen(&buf, prefix_len);
+				strbuf_addstr(&buf,
 						states.stale.items[i].string);
 				result |= delete_ref(buf.buf, NULL);
 			}
diff --git a/t/t5505-remote.sh b/t/t5505-remote.sh
index 5986982..0a25c8b 100755
--- a/t/t5505-remote.sh
+++ b/t/t5505-remote.sh
@@ -128,4 +128,20 @@ test_expect_success 'prune' '
 	 ! git rev-parse refs/remotes/origin/side)
 '
 
+test_expect_success 'add --mirror && prune' '
+	(mkdir mirror &&
+	 cd mirror &&
+	 git init &&
+	 git remote add --mirror -f origin ../one) &&
+	(cd one &&
+	 git branch -m side2 side) &&
+	(cd mirror &&
+	 git rev-parse --verify refs/heads/side2 &&
+	 ! git rev-parse --verify refs/heads/side &&
+	 git fetch origin &&
+	 git remote prune origin &&
+	 ! git rev-parse --verify refs/heads/side2 &&
+	 git rev-parse --verify refs/heads/side)
+'
+
 test_done
-- 
1.5.4.3.446.gbe8932