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rebase: store orig_head as a commit

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Using a struct commit rather than a struct oid to hold orig_head means
that we error out straight away if the branch being rebased does not
point to a commit. It also simplifies the code that handles finding
the merge base and fork point as it no longer has to convert from an
oid to a commit.

To avoid changing the behavior of "git rebase <upstream> <branch>" we
keep the existing call to read_ref() and use lookup_commit_object()
on the oid returned by that rather than calling
lookup_commit_reference_by_name() which applies the ref dwim rules to
its argument.

Helped-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Phillip Wood <phillip.wood@dunelm.org.uk>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Phillip Wood 2022-10-17 13:17:41 +00:00 committed by Junio C Hamano
parent b8dbfd030c
commit f21becdd94
1 changed files with 31 additions and 35 deletions
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66
builtin/rebase.c
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@ -68,7 +68,7 @@ struct rebase_options {
const char *upstream_name;
const char *upstream_arg;
char *head_name;
struct object_id orig_head;
struct commit *orig_head;
struct commit *onto;
const char *onto_name;
const char *revisions;
@ -260,13 +260,13 @@ static int do_interactive_rebase(struct rebase_options *opts, unsigned flags)
struct replay_opts replay = get_replay_opts(opts);
struct string_list commands = STRING_LIST_INIT_DUP;
if (get_revision_ranges(opts->upstream, opts->onto, &opts->orig_head,
if (get_revision_ranges(opts->upstream, opts->onto, &opts->orig_head->object.oid,
&revisions, &shortrevisions))
return -1;
if (init_basic_state(&replay,
opts->head_name ? opts->head_name : "detached HEAD",
opts->onto, &opts->orig_head)) {
opts->onto, &opts->orig_head->object.oid)) {
free(revisions);
free(shortrevisions);
@ -297,8 +297,8 @@ static int do_interactive_rebase(struct rebase_options *opts, unsigned flags)
split_exec_commands(opts->cmd, &commands);
ret = complete_action(the_repository, &replay, flags,
shortrevisions, opts->onto_name, opts->onto,
&opts->orig_head, &commands, opts->autosquash,
&todo_list);
&opts->orig_head->object.oid, &commands,
opts->autosquash, &todo_list);
}
string_list_clear(&commands, 0);
@ -446,7 +446,8 @@ static int read_basic_state(struct rebase_options *opts)
} else if (!read_oneliner(&buf, state_dir_path("head", opts),
READ_ONELINER_WARN_MISSING))
return -1;
if (get_oid_hex(buf.buf, &opts->orig_head))
if (get_oid_hex(buf.buf, &oid) ||
!(opts->orig_head = lookup_commit_object(the_repository, &oid)))
return error(_("invalid orig-head: '%s'"), buf.buf);
if (file_exists(state_dir_path("quiet", opts)))
@ -515,7 +516,7 @@ static int rebase_write_basic_state(struct rebase_options *opts)
write_file(state_dir_path("onto", opts), "%s",
opts->onto ? oid_to_hex(&opts->onto->object.oid) : "");
write_file(state_dir_path("orig-head", opts), "%s",
oid_to_hex(&opts->orig_head));
oid_to_hex(&opts->orig_head->object.oid));
if (!(opts->flags & REBASE_NO_QUIET))
write_file(state_dir_path("quiet", opts), "%s", "");
if (opts->flags & REBASE_VERBOSE)
@ -644,7 +645,7 @@ static int run_am(struct rebase_options *opts)
/* this is now equivalent to !opts->upstream */
&opts->onto->object.oid :
&opts->upstream->object.oid),
oid_to_hex(&opts->orig_head));
oid_to_hex(&opts->orig_head->object.oid));
rebased_patches = xstrdup(git_path("rebased-patches"));
format_patch.out = open(rebased_patches,
@ -678,7 +679,7 @@ static int run_am(struct rebase_options *opts)
free(rebased_patches);
strvec_clear(&am.args);
ropts.oid = &opts->orig_head;
ropts.oid = &opts->orig_head->object.oid;
ropts.branch = opts->head_name;
ropts.default_reflog_action = DEFAULT_REFLOG_ACTION;
reset_head(the_repository, &ropts);
@ -826,7 +827,7 @@ static int checkout_up_to_date(struct rebase_options *options)
strbuf_addf(&buf, "%s: checkout %s",
getenv(GIT_REFLOG_ACTION_ENVIRONMENT),
options->switch_to);
ropts.oid = &options->orig_head;
ropts.oid = &options->orig_head->object.oid;
ropts.branch = options->head_name;
ropts.flags = RESET_HEAD_RUN_POST_CHECKOUT_HOOK;
if (!ropts.branch)
@ -859,15 +860,11 @@ static int is_linear_history(struct commit *from, struct commit *to)
static int can_fast_forward(struct commit *onto, struct commit *upstream,
struct commit *restrict_revision,
struct object_id *head_oid, struct object_id *merge_base)
struct commit *head, struct object_id *merge_base)
{
struct commit *head = lookup_commit(the_repository, head_oid);
struct commit_list *merge_bases = NULL;
int res = 0;
if (!head)
goto done;
merge_bases = get_merge_bases(onto, head);
if (!merge_bases || merge_bases->next) {
oidcpy(merge_base, null_oid());
@ -1302,13 +1299,13 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
if (read_basic_state(&options))
exit(1);
ropts.oid = &options.orig_head;
ropts.oid = &options.orig_head->object.oid;
ropts.branch = options.head_name;
ropts.flags = RESET_HEAD_HARD;
ropts.default_reflog_action = DEFAULT_REFLOG_ACTION;
if (reset_head(the_repository, &ropts) < 0)
die(_("could not move back to %s"),
oid_to_hex(&options.orig_head));
oid_to_hex(&options.orig_head->object.oid));
remove_branch_state(the_repository, 0);
ret = finish_rebase(&options);
goto cleanup;
@ -1594,25 +1591,27 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
*/
if (argc == 1) {
/* Is it "rebase other branchname" or "rebase other commit"? */
struct object_id branch_oid;
branch_name = argv[0];
options.switch_to = argv[0];
/* Is it a local branch? */
strbuf_reset(&buf);
strbuf_addf(&buf, "refs/heads/%s", branch_name);
if (!read_ref(buf.buf, &options.orig_head)) {
if (!read_ref(buf.buf, &branch_oid)) {
die_if_checked_out(buf.buf, 1);
options.head_name = xstrdup(buf.buf);
options.orig_head =
lookup_commit_object(the_repository,
&branch_oid);
/* If not is it a valid ref (branch or commit)? */
} else {
struct commit *commit =
options.orig_head =
lookup_commit_reference_by_name(branch_name);
if (!commit)
die(_("no such branch/commit '%s'"),
branch_name);
oidcpy(&options.orig_head, &commit->object.oid);
options.head_name = NULL;
}
if (!options.orig_head)
die(_("no such branch/commit '%s'"), branch_name);
} else if (argc == 0) {
/* Do not need to switch branches, we are already on it. */
options.head_name =
@ -1629,8 +1628,9 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
FREE_AND_NULL(options.head_name);
branch_name = "HEAD";
}
if (get_oid("HEAD", &options.orig_head))
die(_("Could not resolve HEAD to a revision"));
options.orig_head = lookup_commit_reference_by_name("HEAD");
if (!options.orig_head)
die(_("Could not resolve HEAD to a commit"));
} else
BUG("unexpected number of arguments left to parse");
@ -1662,13 +1662,9 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
options.onto_name);
}
if (options.fork_point > 0) {
struct commit *head =
lookup_commit_reference(the_repository,
&options.orig_head);
if (options.fork_point > 0)
options.restrict_revision =
get_fork_point(options.upstream_name, head);
}
get_fork_point(options.upstream_name, options.orig_head);
if (repo_read_index(the_repository) < 0)
die(_("could not read index"));
@ -1698,7 +1694,7 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
* call it before checking allow_preemptive_ff.
*/
if (can_fast_forward(options.onto, options.upstream, options.restrict_revision,
&options.orig_head, &merge_base) &&
options.orig_head, &merge_base) &&
allow_preemptive_ff) {
int flag;
@ -1775,7 +1771,7 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
strbuf_addf(&msg, "%s: checkout %s",
getenv(GIT_REFLOG_ACTION_ENVIRONMENT), options.onto_name);
ropts.oid = &options.onto->object.oid;
ropts.orig_head = &options.orig_head,
ropts.orig_head = &options.orig_head->object.oid,
ropts.flags = RESET_HEAD_DETACH | RESET_ORIG_HEAD |
RESET_HEAD_RUN_POST_CHECKOUT_HOOK;
ropts.head_msg = msg.buf;
@ -1789,7 +1785,7 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
* we just fast-forwarded.
*/
strbuf_reset(&msg);
if (oideq(&merge_base, &options.orig_head)) {
if (oideq(&merge_base, &options.orig_head->object.oid)) {
printf(_("Fast-forwarded %s to %s.\n"),
branch_name, options.onto_name);
strbuf_addf(&msg, "rebase finished: %s onto %s",
@ -1810,7 +1806,7 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
(options.restrict_revision ?
oid_to_hex(&options.restrict_revision->object.oid) :
oid_to_hex(&options.upstream->object.oid)),
oid_to_hex(&options.orig_head));
oid_to_hex(&options.orig_head->object.oid));
options.revisions = revisions.buf;