git-checkout: be careful about untracked symlinks

diff --git a/builtin-fetch.c b/builtin-fetch.c
index cd5eb9aff530fcb9629bd561bc774e2b9ad69afc..817dd6bff0bf0ddc9a3d00191bb3c422300b878b 100644 (file)
--- a/builtin-fetch.c
+++ b/builtin-fetch.c
@@ -400,14 +400,14 @@ static int store_updated_refs(const char *raw_url, const char *remote_name,
 
 /*
  * We would want to bypass the object transfer altogether if
- * everything we are going to fetch already exists and connected
+ * everything we are going to fetch already exists and is connected
  * locally.
  *
- * The refs we are going to fetch are in to_fetch (nr_heads in
- * total).  If running
+ * The refs we are going to fetch are in ref_map.  If running
  *
- *  $ git rev-list --objects to_fetch[0] to_fetch[1] ... --not --all
+ *  $ git rev-list --objects --stdin --not --all
  *
+ * (feeding all the refs in ref_map on its standard input)
  * does not error out, that means everything reachable from the
  * refs we are going to fetch exists and is connected to some of
  * our existing refs.
@@ -416,8 +416,9 @@ static int quickfetch(struct ref *ref_map)
 {
        struct child_process revlist;
        struct ref *ref;
-       char **argv;
-       int i, err;
+       int err;
+       const char *argv[] = {"rev-list",
+               "--quiet", "--objects", "--stdin", "--not", "--all", NULL};
 
        /*
         * If we are deepening a shallow clone we already have these
@@ -429,34 +430,46 @@ static int quickfetch(struct ref *ref_map)
        if (depth)
                return -1;
 
-       for (i = 0, ref = ref_map; ref; ref = ref->next)
-               i++;
-       if (!i)
+       if (!ref_map)
                return 0;
 
-       argv = xmalloc(sizeof(*argv) * (i + 6));
-       i = 0;
-       argv[i++] = xstrdup("rev-list");
-       argv[i++] = xstrdup("--quiet");
-       argv[i++] = xstrdup("--objects");
-       for (ref = ref_map; ref; ref = ref->next)
-               argv[i++] = xstrdup(sha1_to_hex(ref->old_sha1));
-       argv[i++] = xstrdup("--not");
-       argv[i++] = xstrdup("--all");
-       argv[i++] = NULL;
-
        memset(&revlist, 0, sizeof(revlist));
-       revlist.argv = (const char**)argv;
+       revlist.argv = argv;
        revlist.git_cmd = 1;
-       revlist.no_stdin = 1;
        revlist.no_stdout = 1;
        revlist.no_stderr = 1;
-       err = run_command(&revlist);
+       revlist.in = -1;
+
+       err = start_command(&revlist);
+       if (err) {
+               error("could not run rev-list");
+               return err;
+       }
+
+       /*
+        * If rev-list --stdin encounters an unknown commit, it terminates,
+        * which will cause SIGPIPE in the write loop below.
+        */
+       sigchain_push(SIGPIPE, SIG_IGN);
+
+       for (ref = ref_map; ref; ref = ref->next) {
+               if (write_in_full(revlist.in, sha1_to_hex(ref->old_sha1), 40) < 0 ||
+                   write_in_full(revlist.in, "\n", 1) < 0) {
+                       if (errno != EPIPE && errno != EINVAL)
+                               error("failed write to rev-list: %s", strerror(errno));
+                       err = -1;
+                       break;
+               }
+       }
+
+       if (close(revlist.in)) {
+               error("failed to close rev-list's stdin: %s", strerror(errno));
+               err = -1;
+       }
+
+       sigchain_pop(SIGPIPE);
 
-       for (i = 0; argv[i]; i++)
-               free(argv[i]);
-       free(argv);
-       return err;
+       return finish_command(&revlist) || err;
 }
 
 static int fetch_refs(struct transport *transport, struct ref *ref_map)