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sequencer: allow introducing new root commits 

In the context of the new --rebase-merges mode, which was designed
specifically to allow for changing the existing branch topology
liberally, a user may want to extract commits into a completely fresh
branch that starts with a newly-created root commit.

This is now possible by inserting the command `reset [new root]` before
`pick`ing the commit that wants to become a root commit. Example:

	reset [new root]
	pick 012345 a commit that is about to become a root commit
	pick 234567 this commit will have the previous one as parent

This does not conflict with other uses of the `reset` command because
`[new root]` is not (part of) a valid ref name: both the opening bracket
as well as the space are illegal in ref names.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Johannes Schindelin 2018-05-04 01:01:23 +02:00 committed by Junio C Hamano
parent 21d0764c82
commit ebddf39396
2 changed files with 61 additions and 11 deletions
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38
sequencer.c
View File

@ -2747,18 +2747,34 @@ static int do_reset(const char *name, int len, struct replay_opts *opts)
if (hold_locked_index(&lock, LOCK_REPORT_ON_ERROR) < 0)
return -1;
/* Determine the length of the label */
for (i = 0; i < len; i++)
if (isspace(name[i]))
len = i;
if (len == 10 && !strncmp("[new root]", name, len)) {
if (!opts->have_squash_onto) {
const char *hex;
if (commit_tree("", 0, the_hash_algo->empty_tree,
NULL, &opts->squash_onto,
NULL, NULL))
return error(_("writing fake root commit"));
opts->have_squash_onto = 1;
hex = oid_to_hex(&opts->squash_onto);
if (write_message(hex, strlen(hex),
rebase_path_squash_onto(), 0))
return error(_("writing squash-onto"));
}
oidcpy(&oid, &opts->squash_onto);
} else {
/* Determine the length of the label */
for (i = 0; i < len; i++)
if (isspace(name[i]))
len = i;
strbuf_addf(&ref_name, "refs/rewritten/%.*s", len, name);
if (get_oid(ref_name.buf, &oid) &&
get_oid(ref_name.buf + strlen("refs/rewritten/"), &oid)) {
error(_("could not read '%s'"), ref_name.buf);
rollback_lock_file(&lock);
strbuf_release(&ref_name);
return -1;
strbuf_addf(&ref_name, "refs/rewritten/%.*s", len, name);
if (get_oid(ref_name.buf, &oid) &&
get_oid(ref_name.buf + strlen("refs/rewritten/"), &oid)) {
error(_("could not read '%s'"), ref_name.buf);
rollback_lock_file(&lock);
strbuf_release(&ref_name);
return -1;
}
}
memset(&unpack_tree_opts, 0, sizeof(unpack_tree_opts));

34
t/t3430-rebase-merges.sh
View File

@ -241,4 +241,38 @@ test_expect_success 'refuse to merge ancestors of HEAD' '
test_cmp_rev HEAD $before
'
test_expect_success 'root commits' '
git checkout --orphan unrelated &&
(GIT_AUTHOR_NAME="Parsnip" GIT_AUTHOR_EMAIL="root@example.com" \
test_commit second-root) &&
test_commit third-root &&
cat >script-from-scratch <<-\EOF &&
pick third-root
label first-branch
reset [new root]
pick second-root
merge first-branch # Merge the 3rd root
EOF
test_config sequence.editor \""$PWD"/replace-editor.sh\" &&
test_tick &&
git rebase -i --force --root -r &&
test "Parsnip" = "$(git show -s --format=%an HEAD^)" &&
test $(git rev-parse second-root^0) != $(git rev-parse HEAD^) &&
test $(git rev-parse second-root:second-root.t) = \
$(git rev-parse HEAD^:second-root.t) &&
test_cmp_graph HEAD <<-\EOF &&
* Merge the 3rd root
|\
| * third-root
* second-root
EOF
: fast forward if possible &&
before="$(git rev-parse --verify HEAD)" &&
test_might_fail git config --unset sequence.editor &&
test_tick &&
git rebase -i --root -r &&
test_cmp_rev HEAD $before
'
test_done