update-index: do not die too early in a read-only repository.

diff --git a/builtin-update-index.c b/builtin-update-index.c
index 1ac613a78869e5b0a2ac45ca6ab72adc18a55575..3fbdc67b8880a7d1b46e39d1b7d03c00d65b1408 100644 (file)
--- a/builtin-update-index.c
+++ b/builtin-update-index.c
@@ -486,6 +486,7 @@ int cmd_update_index(int argc, const char **argv, const char *prefix)
        int prefix_length = prefix ? strlen(prefix) : 0;
        char set_executable_bit = 0;
        unsigned int refresh_flags = 0;
+       int lock_error = 0;
        struct lock_file *lock_file;
 
        git_config(git_default_config);
@@ -493,7 +494,9 @@ int cmd_update_index(int argc, const char **argv, const char *prefix)
        /* We can't free this memory, it becomes part of a linked list parsed atexit() */
        lock_file = xcalloc(1, sizeof(struct lock_file));
 
-       newfd = hold_lock_file_for_update(lock_file, get_index_file(), 1);
+       newfd = hold_lock_file_for_update(lock_file, get_index_file(), 0);
+       if (newfd < 0)
+               lock_error = errno;
 
        entries = read_cache();
        if (entries < 0)
@@ -650,6 +653,12 @@ int cmd_update_index(int argc, const char **argv, const char *prefix)
 
  finish:
        if (active_cache_changed) {
+               if (newfd < 0) {
+                       if (refresh_flags & REFRESH_QUIET)
+                               exit(128);
+                       die("unable to create '%s.lock': %s",
+                           get_index_file(), strerror(lock_error));
+               }
                if (write_cache(newfd, active_cache, active_nr) ||
                    close(newfd) || commit_lock_file(lock_file))
                        die("Unable to write new index file");