Fix "git add -u" data corruption.

diff --git a/builtin-archive.c b/builtin-archive.c
index 2fae885f5c27f73820824b612d41fd37ab91239d..7f4e409c998ba4a864bd39032556d71693ff6793 100644 (file)
--- a/builtin-archive.c
+++ b/builtin-archive.c
@@ -149,7 +149,7 @@ int parse_archive_args(int argc, const char **argv, struct archiver *ar)
 {
        const char *extra_argv[MAX_EXTRA_ARGS];
        int extra_argc = 0;
-       const char *format = NULL; /* might want to default to "tar" */
+       const char *format = "tar";
        const char *base = "";
        int verbose = 0;
        int i;
@@ -190,8 +190,6 @@ int parse_archive_args(int argc, const char **argv, struct archiver *ar)
        /* We need at least one parameter -- tree-ish */
        if (argc - 1 < i)
                usage(archive_usage);
-       if (!format)
-               die("You must specify an archive format");
        if (init_archiver(format, ar) < 0)
                die("Unknown archive format '%s'", format);
 
@@ -252,6 +250,8 @@ int cmd_archive(int argc, const char **argv, const char *prefix)
 
        memset(&ar, 0, sizeof(ar));
        tree_idx = parse_archive_args(argc, argv, &ar);
+       if (prefix == NULL)
+               prefix = setup_git_directory();
 
        argv += tree_idx;
        parse_treeish_arg(argv, &ar.args, prefix);