switch: make --orphan switch to an empty tree

Switching and creating branches always involves knowing the
<start-point> to begin the new branch from. Sometimes, people want to
create a new branch that does not have any commits yet; --orphan is a
flag to allow that.

--orphan overrides the default of HEAD for <start-point> instead causing
us to start from an empty history with all tracked files removed from
the index and working tree. The use of --orphan is incompatible with
specifying a <start-point>.

A note on the implementation. An alternative is just create a dummy
commit in-core with empty tree and switch to it. But there's a chance
the commit's SHA-1 may end up somewhere permanent like reflog. It's best
to make sure "commit" pointer is NULL to avoid it.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin/checkout.c b/builtin/checkout.c
index 5f100c1552324775a9a978f03b3adca50138fbe5..0351735c6eb706c160d2dd32c9aa90cde611aa92 100644 (file)
--- a/builtin/checkout.c
+++ b/builtin/checkout.c
@@ -58,6 +58,7 @@ struct checkout_opts {
        int switch_branch_doing_nothing_is_ok;
        int only_merge_on_switching_branches;
        int can_switch_when_in_progress;
+       int orphan_from_empty_tree;
 
        const char *new_branch;
        const char *new_branch_force;
@@ -568,15 +569,21 @@ static int merge_working_tree(const struct checkout_opts *opts,
 {
        int ret;
        struct lock_file lock_file = LOCK_INIT;
+       struct tree *new_tree;
 
        hold_locked_index(&lock_file, LOCK_DIE_ON_ERROR);
        if (read_cache_preload(NULL) < 0)
                return error(_("index file corrupt"));
 
        resolve_undo_clear();
+       if (opts->new_orphan_branch && opts->orphan_from_empty_tree) {
+               if (new_branch_info->commit)
+                       BUG("'switch --orphan' should never accept a commit as starting point");
+               new_tree = parse_tree_indirect(the_hash_algo->empty_tree);
+       } else
+               new_tree = get_commit_tree(new_branch_info->commit);
        if (opts->discard_changes) {
-               ret = reset_tree(get_commit_tree(new_branch_info->commit),
-                                opts, 1, writeout_error);
+               ret = reset_tree(new_tree, opts, 1, writeout_error);
                if (ret)
                        return ret;
        } else {
@@ -614,7 +621,8 @@ static int merge_working_tree(const struct checkout_opts *opts,
                                           &old_branch_info->commit->object.oid :
                                           the_hash_algo->empty_tree);
                init_tree_desc(&trees[0], tree->buffer, tree->size);
-               tree = parse_tree_indirect(&new_branch_info->commit->object.oid);
+               parse_tree(new_tree);
+               tree = new_tree;
                init_tree_desc(&trees[1], tree->buffer, tree->size);
 
                ret = unpack_trees(2, trees, &topts);
@@ -663,7 +671,7 @@ static int merge_working_tree(const struct checkout_opts *opts,
                        o.verbosity = 0;
                        work = write_tree_from_memory(&o);
 
-                       ret = reset_tree(get_commit_tree(new_branch_info->commit),
+                       ret = reset_tree(new_tree,
                                         opts, 1,
                                         writeout_error);
                        if (ret)
@@ -672,13 +680,13 @@ static int merge_working_tree(const struct checkout_opts *opts,
                        o.branch1 = new_branch_info->name;
                        o.branch2 = "local";
                        ret = merge_trees(&o,
-                                         get_commit_tree(new_branch_info->commit),
+                                         new_tree,
                                          work,
                                          get_commit_tree(old_branch_info->commit),
                                          &result);
                        if (ret < 0)
                                exit(128);
-                       ret = reset_tree(get_commit_tree(new_branch_info->commit),
+                       ret = reset_tree(new_tree,
                                         opts, 0,
                                         writeout_error);
                        strbuf_release(&o.obuf);
@@ -696,7 +704,7 @@ static int merge_working_tree(const struct checkout_opts *opts,
        if (write_locked_index(&the_index, &lock_file, COMMIT_LOCK))
                die(_("unable to write new index file"));
 
-       if (!opts->discard_changes && !opts->quiet)
+       if (!opts->discard_changes && !opts->quiet && new_branch_info->commit)
                show_local_changes(&new_branch_info->commit->object, &opts->diff_options);
 
        return 0;
@@ -897,7 +905,10 @@ static void orphaned_commit_warning(struct commit *old_commit, struct commit *ne
        add_pending_object(&revs, object, oid_to_hex(&object->oid));
 
        for_each_ref(add_pending_uninteresting_ref, &revs);
-       add_pending_oid(&revs, "HEAD", &new_commit->object.oid, UNINTERESTING);
+       if (new_commit)
+               add_pending_oid(&revs, "HEAD",
+                               &new_commit->object.oid,
+                               UNINTERESTING);
 
        if (prepare_revision_walk(&revs))
                die(_("internal error in revision walk"));
@@ -932,6 +943,14 @@ static int switch_branches(const struct checkout_opts *opts,
        if (old_branch_info.path)
                skip_prefix(old_branch_info.path, "refs/heads/", &old_branch_info.name);
 
+       if (opts->new_orphan_branch && opts->orphan_from_empty_tree) {
+               if (new_branch_info->name)
+                       BUG("'switch --orphan' should never accept a commit as starting point");
+               new_branch_info->commit = NULL;
+               new_branch_info->name = "(empty)";
+               do_merge = 1;
+       }
+
        if (!new_branch_info->name) {
                new_branch_info->name = "HEAD";
                new_branch_info->commit = old_branch_info.commit;
@@ -1268,6 +1287,8 @@ static int checkout_branch(struct checkout_opts *opts,
        if (opts->new_orphan_branch) {
                if (opts->track != BRANCH_TRACK_UNSPECIFIED)
                        die(_("'%s' cannot be used with '%s'"), "--orphan", "-t");
+               if (opts->orphan_from_empty_tree && new_branch_info->name)
+                       die(_("'%s' cannot take <start-point>"), "--orphan");
        } else if (opts->force_detach) {
                if (opts->track != BRANCH_TRACK_UNSPECIFIED)
                        die(_("'%s' cannot be used with '%s'"), "--detach", "-t");
@@ -1553,6 +1574,7 @@ int cmd_checkout(int argc, const char **argv, const char *prefix)
        opts.accept_pathspec = 1;
        opts.implicit_detach = 1;
        opts.can_switch_when_in_progress = 1;
+       opts.orphan_from_empty_tree = 0;
 
        options = parse_options_dup(checkout_options);
        options = add_common_options(&opts, options);
@@ -1589,6 +1611,7 @@ int cmd_switch(int argc, const char **argv, const char *prefix)
        opts.only_merge_on_switching_branches = 1;
        opts.implicit_detach = 0;
        opts.can_switch_when_in_progress = 0;
+       opts.orphan_from_empty_tree = 1;
 
        options = parse_options_dup(switch_options);
        options = add_common_options(&opts, options);