1 files changed, 26 insertions, 0 deletions
diff --git a/pack-write.c b/pack-write.c
index d1ed3abe21..665e2b29b8 100644
--- a/pack-write.c
+++ b/pack-write.c
@@ -180,3 +180,29 @@ void fixup_pack_header_footer(int pack_fd,
 	SHA1_Final(pack_file_sha1, &c);
 	write_or_die(pack_fd, pack_file_sha1, 20);
 }
+
+char *index_pack_lockfile(int ip_out)
+{
+	int len, s;
+	char packname[46];
+
+	/*
+	 * The first thing we expects from index-pack's output
+	 * is "pack\t%40s\n" or "keep\t%40s\n" (46 bytes) where
+	 * %40s is the newly created pack SHA1 name.  In the "keep"
+	 * case, we need it to remove the corresponding .keep file
+	 * later on.  If we don't get that then tough luck with it.
+	 */
+	for (len = 0;
+		 len < 46 && (s = xread(ip_out, packname+len, 46-len)) > 0;
+		 len += s);
+	if (len == 46 && packname[45] == '\n' &&
+		memcmp(packname, "keep\t", 5) == 0) {
+		char path[PATH_MAX];
+		packname[45] = 0;
+		snprintf(path, sizeof(path), "%s/pack/pack-%s.keep",
+			 get_object_directory(), packname + 5);
+		return xstrdup(path);
+	}
+	return NULL;
+}