improve error message in config.c

Show errno if opening a lockfile fails.

Signed-off-by: Alex Riesen <raa.lkml@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/config.c b/config.c
index 563a91594dd7f0a801ade8b7ac4587aad481679e..f76a78311e50310c02ebb30e3fc8b211ee41e562 100644 (file)
--- a/config.c
+++ b/config.c
@@ -1001,7 +1001,7 @@ int git_config_set_multivar(const char* key, const char* value,
        lock = xcalloc(sizeof(struct lock_file), 1);
        fd = hold_lock_file_for_update(lock, config_filename, 0);
        if (fd < 0) {
-               error("could not lock config file %s", config_filename);
+               error("could not lock config file %s: %s", config_filename, strerror(errno));
                free(store.key);
                ret = -1;
                goto out_free;