reset: allow reset on unborn branch

diff --git a/builtin/reset.c b/builtin/reset.c
index b776867ad256182abc065c456c10374699c94d7b..45b01ebbcc81cb0acde12b97eea1ae9afd341559 100644 (file)
--- a/builtin/reset.c
+++ b/builtin/reset.c
@@ -240,7 +240,7 @@ static int update_refs(const char *rev, const unsigned char *sha1)
 int cmd_reset(int argc, const char **argv, const char *prefix)
 {
        int reset_type = NONE, update_ref_status = 0, quiet = 0;
-       int patch_mode = 0;
+       int patch_mode = 0, unborn;
        const char *rev;
        unsigned char sha1[20];
        const char **pathspec = NULL;
@@ -265,7 +265,11 @@ int cmd_reset(int argc, const char **argv, const char *prefix)
                                                PARSE_OPT_KEEP_DASHDASH);
        pathspec = parse_args(argv, prefix, &rev);
 
-       if (!pathspec) {
+       unborn = !strcmp(rev, "HEAD") && get_sha1("HEAD", sha1);
+       if (unborn) {
+               /* reset on unborn branch: treat as reset to empty tree */
+               hashcpy(sha1, EMPTY_TREE_SHA1_BIN);
+       } else if (!pathspec) {
                struct commit *commit;
                if (get_sha1_committish(rev, sha1))
                        die(_("Failed to resolve '%s' as a valid revision."), rev);
@@ -286,7 +290,7 @@ int cmd_reset(int argc, const char **argv, const char *prefix)
        if (patch_mode) {
                if (reset_type != NONE)
                        die(_("--patch is incompatible with --{hard,mixed,soft}"));
-               return run_add_interactive(rev, "--patch=reset", pathspec);
+               return run_add_interactive(sha1_to_hex(sha1), "--patch=reset", pathspec);
        }
 
        /* git reset tree [--] paths... can be used to
@@ -340,16 +344,16 @@ int cmd_reset(int argc, const char **argv, const char *prefix)
                        die(_("Could not write new index file."));
        }
 
-       if (!pathspec) {
+       if (!pathspec && !unborn) {
                /* Any resets without paths update HEAD to the head being
                 * switched to, saving the previous head in ORIG_HEAD before. */
                update_ref_status = update_refs(rev, sha1);
 
                if (reset_type == HARD && !update_ref_status && !quiet)
                        print_new_head_line(lookup_commit_reference(sha1));
-
-               remove_branch_state();
        }
+       if (!pathspec)
+               remove_branch_state();
 
        return update_ref_status;
 }