git am: Display some help text when patch is empty

diff --git a/pack-refs.c b/pack-refs.c
index 301fc60eae1ad53721851a272a0fbd0192881801..7f43f8ac3398fb2dbe393f08811989b0a8d4e2dd 100644 (file)
--- a/pack-refs.c
+++ b/pack-refs.c
@@ -93,8 +93,7 @@ int pack_refs(unsigned int flags)
                                       LOCK_DIE_ON_ERROR);
        cbdata.refs_file = fdopen(fd, "w");
        if (!cbdata.refs_file)
-               die("unable to create ref-pack file structure (%s)",
-                   strerror(errno));
+               die_errno("unable to create ref-pack file structure");
 
        /* perhaps other traits later as well */
        fprintf(cbdata.refs_file, "# pack-refs with: peeled \n");
@@ -103,7 +102,7 @@ int pack_refs(unsigned int flags)
        if (ferror(cbdata.refs_file))
                die("failed to write ref-pack file");
        if (fflush(cbdata.refs_file) || fsync(fd) || fclose(cbdata.refs_file))
-               die("failed to write ref-pack file (%s)", strerror(errno));
+               die_errno("failed to write ref-pack file");
        /*
         * Since the lock file was fdopen()'ed and then fclose()'ed above,
         * assign -1 to the lock file descriptor so that commit_lock_file()
@@ -111,7 +110,7 @@ int pack_refs(unsigned int flags)
         */
        packed.fd = -1;
        if (commit_lock_file(&packed) < 0)
-               die("unable to overwrite old ref-pack file (%s)", strerror(errno));
+               die_errno("unable to overwrite old ref-pack file");
        if (cbdata.flags & PACK_REFS_PRUNE)
                prune_refs(cbdata.ref_to_prune);
        return 0;