sequencer: learn about the special "fake root commit" handling
When an interactive rebase wants to recreate a root commit, it
- first creates a new, empty root commit,
- checks it out,
- converts the next `pick` command so that it amends the empty root
commit
Introduce support in the sequencer to handle such an empty root commit,
by looking for the file <GIT_DIR>/rebase-merge/squash-onto; if it exists
and contains a commit name, the sequencer will compare the HEAD to said
root commit, and if identical, a new root commit will be created.
While converting scripted code into proper, portable C, we also do away
with the old "amend with an empty commit message, then cherry-pick
without committing, then amend again" dance and replace it with code
that uses the internal API properly to do exactly what we want: create a
new root commit.
To keep the implementation simple, we always spawn `git commit` to create
new root commits.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/sequencer.h b/sequencer.h
index d9570d9..4b27178 100644
--- a/sequencer.h
+++ b/sequencer.h
@@ -44,6 +44,10 @@ struct replay_opts {
char **xopts;
size_t xopts_nr, xopts_alloc;
+ /* placeholder commit for -i --root */
+ struct object_id squash_onto;
+ int have_squash_onto;
+
/* Only used by REPLAY_NONE */
struct rev_info *revs;
};
