refs.c: change ref_transaction_update() to do error checking and return status

diff --git a/lockfile.c b/lockfile.c
index 8fbcb6a98aae85b48c6f8de29c6f95af58823411..a921d77afcc5b54fdeba7bca6afcd85548332f0d 100644 (file)
--- a/lockfile.c
+++ b/lockfile.c
@@ -121,7 +121,7 @@ static char *resolve_symlink(char *p, size_t s)
        return p;
 }
 
-
+/* Make sure errno contains a meaningful value on error */
 static int lock_file(struct lock_file *lk, const char *path, int flags)
 {
        /*
@@ -130,8 +130,10 @@ static int lock_file(struct lock_file *lk, const char *path, int flags)
         */
        static const size_t max_path_len = sizeof(lk->filename) - 5;
 
-       if (strlen(path) >= max_path_len)
+       if (strlen(path) >= max_path_len) {
+               errno = ENAMETOOLONG;
                return -1;
+       }
        strcpy(lk->filename, path);
        if (!(flags & LOCK_NODEREF))
                resolve_symlink(lk->filename, max_path_len);
@@ -148,44 +150,51 @@ static int lock_file(struct lock_file *lk, const char *path, int flags)
                        lock_file_list = lk;
                        lk->on_list = 1;
                }
-               if (adjust_shared_perm(lk->filename))
-                       return error("cannot fix permission bits on %s",
-                                    lk->filename);
+               if (adjust_shared_perm(lk->filename)) {
+                       int save_errno = errno;
+                       error("cannot fix permission bits on %s",
+                             lk->filename);
+                       errno = save_errno;
+                       return -1;
+               }
        }
        else
                lk->filename[0] = 0;
        return lk->fd;
 }
 
-static char *unable_to_lock_message(const char *path, int err)
+void unable_to_lock_message(const char *path, int err, struct strbuf *buf)
 {
-       struct strbuf buf = STRBUF_INIT;
-
        if (err == EEXIST) {
-               strbuf_addf(&buf, "Unable to create '%s.lock': %s.\n\n"
+               strbuf_addf(buf, "Unable to create '%s.lock': %s.\n\n"
                    "If no other git process is currently running, this probably means a\n"
                    "git process crashed in this repository earlier. Make sure no other git\n"
                    "process is running and remove the file manually to continue.",
                            absolute_path(path), strerror(err));
        } else
-               strbuf_addf(&buf, "Unable to create '%s.lock': %s",
+               strbuf_addf(buf, "Unable to create '%s.lock': %s",
                            absolute_path(path), strerror(err));
-       return strbuf_detach(&buf, NULL);
 }
 
 int unable_to_lock_error(const char *path, int err)
 {
-       char *msg = unable_to_lock_message(path, err);
-       error("%s", msg);
-       free(msg);
+       struct strbuf buf = STRBUF_INIT;
+
+       unable_to_lock_message(path, err, &buf);
+       error("%s", buf.buf);
+       strbuf_release(&buf);
        return -1;
 }
 
 NORETURN void unable_to_lock_index_die(const char *path, int err)
 {
-       die("%s", unable_to_lock_message(path, err));
+       struct strbuf buf = STRBUF_INIT;
+
+       unable_to_lock_message(path, err, &buf);
+       die("%s", buf.buf);
 }
 
+/* This should return a meaningful errno on failure */
 int hold_lock_file_for_update(struct lock_file *lk, const char *path, int flags)
 {
        int fd = lock_file(lk, path, flags);