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git/builtin/replay.c

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/*
* "git replay" builtin command
*/
#include "git-compat-util.h"
#include "builtin.h"
#include "environment.h"
#include "hex.h"
#include "lockfile.h"
#include "merge-ort.h"
#include "object-name.h"
#include "parse-options.h"
#include "refs.h"
#include "revision.h"
#include "strmap.h"
#include <oidset.h>
#include <tree.h>
static const char *short_commit_name(struct commit *commit)
{
return repo_find_unique_abbrev(the_repository, &commit->object.oid,
DEFAULT_ABBREV);
}
static struct commit *peel_committish(const char *name)
{
struct object *obj;
struct object_id oid;
if (repo_get_oid(the_repository, name, &oid))
return NULL;
obj = parse_object(the_repository, &oid);
return (struct commit *)repo_peel_to_type(the_repository, name, 0, obj,
OBJ_COMMIT);
}
static char *get_author(const char *message)
{
size_t len;
const char *a;
a = find_commit_header(message, "author", &len);
if (a)
return xmemdupz(a, len);
return NULL;
}
static struct commit *create_commit(struct tree *tree,
struct commit *based_on,
struct commit *parent)
{
struct object_id ret;
struct object *obj = NULL;
struct commit_list *parents = NULL;
char *author;
char *sign_commit = NULL; /* FIXME: cli users might want to sign again */
struct commit_extra_header *extra = NULL;
struct strbuf msg = STRBUF_INIT;
const char *out_enc = get_commit_output_encoding();
const char *message = repo_logmsg_reencode(the_repository, based_on,
NULL, out_enc);
const char *orig_message = NULL;
const char *exclude_gpgsig[] = { "gpgsig", NULL };
commit_list_insert(parent, &parents);
extra = read_commit_extra_headers(based_on, exclude_gpgsig);
find_commit_subject(message, &orig_message);
strbuf_addstr(&msg, orig_message);
author = get_author(message);
reset_ident_date();
if (commit_tree_extended(msg.buf, msg.len, &tree->object.oid, parents,
&ret, author, NULL, sign_commit, extra)) {
error(_("failed to write commit object"));
goto out;
}
obj = parse_object(the_repository, &ret);
out:
free_commit_extra_headers(extra);
free_commit_list(parents);
strbuf_release(&msg);
free(author);
return (struct commit *)obj;
}
struct ref_info {
struct commit *onto;
struct strset positive_refs;
struct strset negative_refs;
int positive_refexprs;
int negative_refexprs;
};
static void get_ref_information(struct rev_cmdline_info *cmd_info,
struct ref_info *ref_info)
{
int i;
ref_info->onto = NULL;
strset_init(&ref_info->positive_refs);
strset_init(&ref_info->negative_refs);
ref_info->positive_refexprs = 0;
ref_info->negative_refexprs = 0;
/*
* When the user specifies e.g.
* git replay origin/main..mybranch
* git replay ^origin/next mybranch1 mybranch2
* we want to be able to determine where to replay the commits. In
* these examples, the branches are probably based on an old version
* of either origin/main or origin/next, so we want to replay on the
* newest version of that branch. In contrast we would want to error
* out if they ran
* git replay ^origin/master ^origin/next mybranch
* git replay mybranch~2..mybranch
* the first of those because there's no unique base to choose, and
* the second because they'd likely just be replaying commits on top
* of the same commit and not making any difference.
*/
for (i = 0; i < cmd_info->nr; i++) {
struct rev_cmdline_entry *e = cmd_info->rev + i;
struct object_id oid;
const char *refexpr = e->name;
char *fullname = NULL;
int can_uniquely_dwim = 1;
if (*refexpr == '^')
refexpr++;
if (repo_dwim_ref(the_repository, refexpr, strlen(refexpr), &oid, &fullname, 0) != 1)
can_uniquely_dwim = 0;
if (e->flags & BOTTOM) {
if (can_uniquely_dwim)
strset_add(&ref_info->negative_refs, fullname);
if (!ref_info->negative_refexprs)
ref_info->onto = lookup_commit_reference_gently(the_repository,
&e->item->oid, 1);
ref_info->negative_refexprs++;
} else {
if (can_uniquely_dwim)
strset_add(&ref_info->positive_refs, fullname);
ref_info->positive_refexprs++;
}
free(fullname);
}
}
static void determine_replay_mode(struct rev_cmdline_info *cmd_info,
const char *onto_name,
char **advance_name,
struct commit **onto,
struct strset **update_refs)
{
struct ref_info rinfo;
get_ref_information(cmd_info, &rinfo);
if (!rinfo.positive_refexprs)
die(_("need some commits to replay"));
if (onto_name && *advance_name)
die(_("--onto and --advance are incompatible"));
else if (onto_name) {
*onto = peel_committish(onto_name);
if (rinfo.positive_refexprs <
strset_get_size(&rinfo.positive_refs))
die(_("all positive revisions given must be references"));
} else if (*advance_name) {
struct object_id oid;
char *fullname = NULL;
*onto = peel_committish(*advance_name);
if (repo_dwim_ref(the_repository, *advance_name, strlen(*advance_name),
&oid, &fullname, 0) == 1) {
free(*advance_name);
*advance_name = fullname;
} else {
die(_("argument to --advance must be a reference"));
}
if (rinfo.positive_refexprs > 1)
die(_("cannot advance target with multiple sources because ordering would be ill-defined"));
} else {
int positive_refs_complete = (
rinfo.positive_refexprs ==
strset_get_size(&rinfo.positive_refs));
int negative_refs_complete = (
rinfo.negative_refexprs ==
strset_get_size(&rinfo.negative_refs));
/*
* We need either positive_refs_complete or
* negative_refs_complete, but not both.
*/
if (rinfo.negative_refexprs > 0 &&
positive_refs_complete == negative_refs_complete)
die(_("cannot implicitly determine whether this is an --advance or --onto operation"));
if (negative_refs_complete) {
struct hashmap_iter iter;
struct strmap_entry *entry;
const char *last_key = NULL;
if (rinfo.negative_refexprs == 0)
die(_("all positive revisions given must be references"));
else if (rinfo.negative_refexprs > 1)
die(_("cannot implicitly determine whether this is an --advance or --onto operation"));
else if (rinfo.positive_refexprs > 1)
die(_("cannot advance target with multiple source branches because ordering would be ill-defined"));
/* Only one entry, but we have to loop to get it */
strset_for_each_entry(&rinfo.negative_refs,
&iter, entry) {
last_key = entry->key;
}
free(*advance_name);
*advance_name = xstrdup_or_null(last_key);
} else { /* positive_refs_complete */
if (rinfo.negative_refexprs > 1)
die(_("cannot implicitly determine correct base for --onto"));
if (rinfo.negative_refexprs == 1)
*onto = rinfo.onto;
}
}
if (!*advance_name) {
*update_refs = xcalloc(1, sizeof(**update_refs));
**update_refs = rinfo.positive_refs;
memset(&rinfo.positive_refs, 0, sizeof(**update_refs));
}
strset_clear(&rinfo.negative_refs);
strset_clear(&rinfo.positive_refs);
}
static struct commit *mapped_commit(kh_oid_map_t *replayed_commits,
struct commit *commit,
struct commit *fallback)
{
khint_t pos = kh_get_oid_map(replayed_commits, commit->object.oid);
if (pos == kh_end(replayed_commits))
return fallback;
return kh_value(replayed_commits, pos);
}
static struct commit *pick_regular_commit(struct commit *pickme,
kh_oid_map_t *replayed_commits,
struct commit *onto,
struct merge_options *merge_opt,
struct merge_result *result)
{
struct commit *base, *replayed_base;
struct tree *pickme_tree, *base_tree;
base = pickme->parents->item;
replayed_base = mapped_commit(replayed_commits, base, onto);
result->tree = repo_get_commit_tree(the_repository, replayed_base);
pickme_tree = repo_get_commit_tree(the_repository, pickme);
base_tree = repo_get_commit_tree(the_repository, base);
merge_opt->branch1 = short_commit_name(replayed_base);
merge_opt->branch2 = short_commit_name(pickme);
merge_opt->ancestor = xstrfmt("parent of %s", merge_opt->branch2);
merge_incore_nonrecursive(merge_opt,
base_tree,
result->tree,
pickme_tree,
result);
free((char*)merge_opt->ancestor);
merge_opt->ancestor = NULL;
if (!result->clean)
return NULL;
return create_commit(result->tree, pickme, replayed_base);
}
int cmd_replay(int argc, const char **argv, const char *prefix)
{
const char *advance_name_opt = NULL;
char *advance_name = NULL;
struct commit *onto = NULL;
const char *onto_name = NULL;
int contained = 0;
struct rev_info revs;
struct commit *last_commit = NULL;
struct commit *commit;
struct merge_options merge_opt;
struct merge_result result;
struct strset *update_refs = NULL;
kh_oid_map_t *replayed_commits;
int ret = 0;
const char * const replay_usage[] = {
N_("(EXPERIMENTAL!) git replay "
"([--contained] --onto <newbase> | --advance <branch>) "
"<revision-range>..."),
NULL
};
struct option replay_options[] = {
OPT_STRING(0, "advance", &advance_name_opt,
N_("branch"),
N_("make replay advance given branch")),
OPT_STRING(0, "onto", &onto_name,
N_("revision"),
N_("replay onto given commit")),
OPT_BOOL(0, "contained", &contained,
N_("advance all branches contained in revision-range")),
OPT_END()
};
argc = parse_options(argc, argv, prefix, replay_options, replay_usage,
PARSE_OPT_KEEP_ARGV0 | PARSE_OPT_KEEP_UNKNOWN_OPT);
if (!onto_name && !advance_name_opt) {
error(_("option --onto or --advance is mandatory"));
usage_with_options(replay_usage, replay_options);
}
if (advance_name_opt && contained)
die(_("options '%s' and '%s' cannot be used together"),
"--advance", "--contained");
advance_name = xstrdup_or_null(advance_name_opt);
repo_init_revisions(the_repository, &revs, prefix);
/*
* Set desired values for rev walking options here. If they
* are changed by some user specified option in setup_revisions()
* below, we will detect that below and then warn.
*
* TODO: In the future we might want to either die(), or allow
* some options changing these values if we think they could
* be useful.
*/
revs.reverse = 1;
revs.sort_order = REV_SORT_IN_GRAPH_ORDER;
revs.topo_order = 1;
revs.simplify_history = 0;
argc = setup_revisions(argc, argv, &revs, NULL);
if (argc > 1) {
ret = error(_("unrecognized argument: %s"), argv[1]);
goto cleanup;
}
/*
* Detect and warn if we override some user specified rev
* walking options.
*/
if (revs.reverse != 1) {
warning(_("some rev walking options will be overridden as "
"'%s' bit in 'struct rev_info' will be forced"),
"reverse");
revs.reverse = 1;
}
if (revs.sort_order != REV_SORT_IN_GRAPH_ORDER) {
warning(_("some rev walking options will be overridden as "
"'%s' bit in 'struct rev_info' will be forced"),
"sort_order");
revs.sort_order = REV_SORT_IN_GRAPH_ORDER;
}
if (revs.topo_order != 1) {
warning(_("some rev walking options will be overridden as "
"'%s' bit in 'struct rev_info' will be forced"),
"topo_order");
revs.topo_order = 1;
}
if (revs.simplify_history != 0) {
warning(_("some rev walking options will be overridden as "
"'%s' bit in 'struct rev_info' will be forced"),
"simplify_history");
revs.simplify_history = 0;
}
determine_replay_mode(&revs.cmdline, onto_name, &advance_name,
&onto, &update_refs);
if (!onto) /* FIXME: Should handle replaying down to root commit */
die("Replaying down to root commit is not supported yet!");
if (prepare_revision_walk(&revs) < 0) {
ret = error(_("error preparing revisions"));
goto cleanup;
}
init_basic_merge_options(&merge_opt, the_repository);
memset(&result, 0, sizeof(result));
merge_opt.show_rename_progress = 0;
last_commit = onto;
replayed_commits = kh_init_oid_map();
while ((commit = get_revision(&revs))) {
const struct name_decoration *decoration;
khint_t pos;
int hr;
if (!commit->parents)
die(_("replaying down to root commit is not supported yet!"));
if (commit->parents->next)
die(_("replaying merge commits is not supported yet!"));
last_commit = pick_regular_commit(commit, replayed_commits, onto,
&merge_opt, &result);
if (!last_commit)
break;
/* Record commit -> last_commit mapping */
pos = kh_put_oid_map(replayed_commits, commit->object.oid, &hr);
if (hr == 0)
BUG("Duplicate rewritten commit: %s\n",
oid_to_hex(&commit->object.oid));
kh_value(replayed_commits, pos) = last_commit;
/* Update any necessary branches */
if (advance_name)
continue;
decoration = get_name_decoration(&commit->object);
if (!decoration)
continue;
while (decoration) {
if (decoration->type == DECORATION_REF_LOCAL &&
(contained || strset_contains(update_refs,
decoration->name))) {
printf("update %s %s %s\n",
decoration->name,
oid_to_hex(&last_commit->object.oid),
oid_to_hex(&commit->object.oid));
}
decoration = decoration->next;
}
}
/* In --advance mode, advance the target ref */
if (result.clean == 1 && advance_name) {
printf("update %s %s %s\n",
advance_name,
oid_to_hex(&last_commit->object.oid),
oid_to_hex(&onto->object.oid));
}
merge_finalize(&merge_opt, &result);
kh_destroy_oid_map(replayed_commits);
if (update_refs) {
strset_clear(update_refs);
free(update_refs);
}
ret = result.clean;
cleanup:
release_revisions(&revs);
free(advance_name);
/* Return */
if (ret < 0)
exit(128);
return ret ? 0 : 1;
}
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