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Merge branch 'pk/rebase-in-c-4-opts' 

Rewrite "git rebase" in C.

* pk/rebase-in-c-4-opts:
  builtin rebase: support --root
  builtin rebase: add support for custom merge strategies
  builtin rebase: support `fork-point` option
  merge-base --fork-point: extract libified function
  builtin rebase: support --rebase-merges[=[no-]rebase-cousins]
  builtin rebase: support `--allow-empty-message` option
  builtin rebase: support `--exec`
  builtin rebase: support `--autostash` option
  builtin rebase: support `-C` and `--whitespace=<type>`
  builtin rebase: support `--gpg-sign` option
  builtin rebase: support `--autosquash`
  builtin rebase: support `keep-empty` option
  builtin rebase: support `ignore-date` option
  builtin rebase: support `ignore-whitespace` option
  builtin rebase: support --committer-date-is-author-date
  builtin rebase: support --rerere-autoupdate
  builtin rebase: support --signoff
  builtin rebase: allow selecting the rebase "backend"
This commit is contained in:
Junio C Hamano 2018-11-02 11:04:55 +09:00
parent 39f7331545 9dba809a69
commit 0293121717
4 changed files with 530 additions and 85 deletions
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81
builtin/merge-base.c
View File

@ -111,54 +111,12 @@ static int handle_is_ancestor(int argc, const char **argv)
return 1;
}
struct rev_collect {
struct commit **commit;
int nr;
int alloc;
unsigned int initial : 1;
};
static void add_one_commit(struct object_id *oid, struct rev_collect *revs)
{
struct commit *commit;
if (is_null_oid(oid))
return;
commit = lookup_commit(the_repository, oid);
if (!commit ||
(commit->object.flags & TMP_MARK) ||
parse_commit(commit))
return;
ALLOC_GROW(revs->commit, revs->nr + 1, revs->alloc);
revs->commit[revs->nr++] = commit;
commit->object.flags |= TMP_MARK;
}
static int collect_one_reflog_ent(struct object_id *ooid, struct object_id *noid,
const char *ident, timestamp_t timestamp,
int tz, const char *message, void *cbdata)
{
struct rev_collect *revs = cbdata;
if (revs->initial) {
revs->initial = 0;
add_one_commit(ooid, revs);
}
add_one_commit(noid, revs);
return 0;
}
static int handle_fork_point(int argc, const char **argv)
{
struct object_id oid;
char *refname;
struct commit *derived, *fork_point;
const char *commitname;
struct rev_collect revs;
struct commit *derived;
struct commit_list *bases;
int i, ret = 0;
switch (dwim_ref(argv[0], strlen(argv[0]), &oid, &refname)) {
case 0:
@ -174,41 +132,14 @@ static int handle_fork_point(int argc, const char **argv)
die("Not a valid object name: '%s'", commitname);
derived = lookup_commit_reference(the_repository, &oid);
memset(&revs, 0, sizeof(revs));
revs.initial = 1;
for_each_reflog_ent(refname, collect_one_reflog_ent, &revs);
if (!revs.nr && !get_oid(refname, &oid))
add_one_commit(&oid, &revs);
fork_point = get_fork_point(refname, derived);
for (i = 0; i < revs.nr; i++)
revs.commit[i]->object.flags &= ~TMP_MARK;
if (!fork_point)
return 1;
bases = get_merge_bases_many_dirty(derived, revs.nr, revs.commit);
/*
* There should be one and only one merge base, when we found
* a common ancestor among reflog entries.
*/
if (!bases || bases->next) {
ret = 1;
goto cleanup_return;
}
/* And the found one must be one of the reflog entries */
for (i = 0; i < revs.nr; i++)
if (&bases->item->object == &revs.commit[i]->object)
break; /* found */
if (revs.nr <= i) {
ret = 1; /* not found */
goto cleanup_return;
}
printf("%s\n", oid_to_hex(&bases->item->object.oid));
cleanup_return:
free_commit_list(bases);
return ret;
printf("%s\n", oid_to_hex(&fork_point->object.oid));
return 0;
}
int cmd_merge_base(int argc, const char **argv, const char *prefix)

450
builtin/rebase.c
View File

@ -64,12 +64,6 @@ static int use_builtin_rebase(void)
return ret;
}
static int apply_autostash(void)
{
warning("TODO");
return 0;
}
struct rebase_options {
enum rebase_type type;
const char *state_dir;
@ -83,6 +77,7 @@ struct rebase_options {
const char *revisions;
const char *switch_to;
int root;
struct object_id *squash_onto;
struct commit *restrict_revision;
int dont_finish_rebase;
enum {
@ -94,6 +89,16 @@ struct rebase_options {
} flags;
struct strbuf git_am_opt;
const char *action;
int signoff;
int allow_rerere_autoupdate;
int keep_empty;
int autosquash;
char *gpg_sign_opt;
int autostash;
char *cmd;
int allow_empty_message;
int rebase_merges, rebase_cousins;
char *strategy, *strategy_opts;
};
static int is_interactive(struct rebase_options *opts)
@ -102,6 +107,23 @@ static int is_interactive(struct rebase_options *opts)
opts->type == REBASE_PRESERVE_MERGES;
}
static void imply_interactive(struct rebase_options *opts, const char *option)
{
switch (opts->type) {
case REBASE_AM:
die(_("%s requires an interactive rebase"), option);
break;
case REBASE_INTERACTIVE:
case REBASE_PRESERVE_MERGES:
break;
case REBASE_MERGE:
/* we silently *upgrade* --merge to --interactive if needed */
default:
opts->type = REBASE_INTERACTIVE; /* implied */
break;
}
}
/* Returns the filename prefixed by the state_dir */
static const char *state_dir_path(const char *filename, struct rebase_options *opts)
{
@ -169,18 +191,106 @@ static int read_basic_state(struct rebase_options *opts)
if (file_exists(state_dir_path("verbose", opts)))
opts->flags |= REBASE_VERBOSE;
if (file_exists(state_dir_path("signoff", opts))) {
opts->signoff = 1;
opts->flags |= REBASE_FORCE;
}
if (file_exists(state_dir_path("allow_rerere_autoupdate", opts))) {
strbuf_reset(&buf);
if (read_one(state_dir_path("allow_rerere_autoupdate", opts),
&buf))
return -1;
if (!strcmp(buf.buf, "--rerere-autoupdate"))
opts->allow_rerere_autoupdate = 1;
else if (!strcmp(buf.buf, "--no-rerere-autoupdate"))
opts->allow_rerere_autoupdate = 0;
else
warning(_("ignoring invalid allow_rerere_autoupdate: "
"'%s'"), buf.buf);
} else
opts->allow_rerere_autoupdate = -1;
if (file_exists(state_dir_path("gpg_sign_opt", opts))) {
strbuf_reset(&buf);
if (read_one(state_dir_path("gpg_sign_opt", opts),
&buf))
return -1;
free(opts->gpg_sign_opt);
opts->gpg_sign_opt = xstrdup(buf.buf);
}
if (file_exists(state_dir_path("strategy", opts))) {
strbuf_reset(&buf);
if (read_one(state_dir_path("strategy", opts), &buf))
return -1;
free(opts->strategy);
opts->strategy = xstrdup(buf.buf);
}
if (file_exists(state_dir_path("strategy_opts", opts))) {
strbuf_reset(&buf);
if (read_one(state_dir_path("strategy_opts", opts), &buf))
return -1;
free(opts->strategy_opts);
opts->strategy_opts = xstrdup(buf.buf);
}
strbuf_release(&buf);
return 0;
}
static int apply_autostash(struct rebase_options *opts)
{
const char *path = state_dir_path("autostash", opts);
struct strbuf autostash = STRBUF_INIT;
struct child_process stash_apply = CHILD_PROCESS_INIT;
if (!file_exists(path))
return 0;
if (read_one(state_dir_path("autostash", opts), &autostash))
return error(_("Could not read '%s'"), path);
argv_array_pushl(&stash_apply.args,
"stash", "apply", autostash.buf, NULL);
stash_apply.git_cmd = 1;
stash_apply.no_stderr = stash_apply.no_stdout =
stash_apply.no_stdin = 1;
if (!run_command(&stash_apply))
printf(_("Applied autostash.\n"));
else {
struct argv_array args = ARGV_ARRAY_INIT;
int res = 0;
argv_array_pushl(&args,
"stash", "store", "-m", "autostash", "-q",
autostash.buf, NULL);
if (run_command_v_opt(args.argv, RUN_GIT_CMD))
res = error(_("Cannot store %s"), autostash.buf);
argv_array_clear(&args);
strbuf_release(&autostash);
if (res)
return res;
fprintf(stderr,
_("Applying autostash resulted in conflicts.\n"
"Your changes are safe in the stash.\n"
"You can run \"git stash pop\" or \"git stash drop\" "
"at any time.\n"));
}
strbuf_release(&autostash);
return 0;
}
static int finish_rebase(struct rebase_options *opts)
{
struct strbuf dir = STRBUF_INIT;
const char *argv_gc_auto[] = { "gc", "--auto", NULL };
delete_ref(NULL, "REBASE_HEAD", NULL, REF_NO_DEREF);
apply_autostash();
apply_autostash(opts);
close_all_packs(the_repository->objects);
/*
* We ignore errors in 'gc --auto', since the
@ -250,6 +360,26 @@ static int run_specific_rebase(struct rebase_options *opts)
if (opts->switch_to)
add_var(&script_snippet, "switch_to", opts->switch_to);
add_var(&script_snippet, "action", opts->action ? opts->action : "");
add_var(&script_snippet, "signoff", opts->signoff ? "--signoff" : "");
add_var(&script_snippet, "allow_rerere_autoupdate",
opts->allow_rerere_autoupdate < 0 ? "" :
opts->allow_rerere_autoupdate ?
"--rerere-autoupdate" : "--no-rerere-autoupdate");
add_var(&script_snippet, "keep_empty", opts->keep_empty ? "yes" : "");
add_var(&script_snippet, "autosquash", opts->autosquash ? "t" : "");
add_var(&script_snippet, "gpg_sign_opt", opts->gpg_sign_opt);
add_var(&script_snippet, "cmd", opts->cmd);
add_var(&script_snippet, "allow_empty_message",
opts->allow_empty_message ? "--allow-empty-message" : "");
add_var(&script_snippet, "rebase_merges",
opts->rebase_merges ? "t" : "");
add_var(&script_snippet, "rebase_cousins",
opts->rebase_cousins ? "t" : "");
add_var(&script_snippet, "strategy", opts->strategy);
add_var(&script_snippet, "strategy_opts", opts->strategy_opts);
add_var(&script_snippet, "rebase_root", opts->root ? "t" : "");
add_var(&script_snippet, "squash_onto",
opts->squash_onto ? oid_to_hex(opts->squash_onto) : "");
switch (opts->type) {
case REBASE_AM:
@ -287,7 +417,7 @@ static int run_specific_rebase(struct rebase_options *opts)
} else if (status == 2) {
struct strbuf dir = STRBUF_INIT;
apply_autostash();
apply_autostash(opts);
strbuf_addstr(&dir, opts->state_dir);
remove_dir_recursively(&dir, 0);
strbuf_release(&dir);
@ -410,6 +540,23 @@ static int rebase_config(const char *var, const char *value, void *data)
return 0;
}
if (!strcmp(var, "rebase.autosquash")) {
opts->autosquash = git_config_bool(var, value);
return 0;
}
if (!strcmp(var, "commit.gpgsign")) {
free(opts->gpg_sign_opt);
opts->gpg_sign_opt = git_config_bool(var, value) ?
xstrdup("-S") : NULL;
return 0;
}
if (!strcmp(var, "rebase.autostash")) {
opts->autostash = git_config_bool(var, value);
return 0;
}
return git_default_config(var, value, data);
}
@ -453,12 +600,37 @@ static int can_fast_forward(struct commit *onto, struct object_id *head_oid,
return res && is_linear_history(onto, head);
}
/* -i followed by -m is still -i */
static int parse_opt_merge(const struct option *opt, const char *arg, int unset)
{
struct rebase_options *opts = opt->value;
if (!is_interactive(opts))
opts->type = REBASE_MERGE;
return 0;
}
/* -i followed by -p is still explicitly interactive, but -p alone is not */
static int parse_opt_interactive(const struct option *opt, const char *arg,
int unset)
{
struct rebase_options *opts = opt->value;
opts->type = REBASE_INTERACTIVE;
opts->flags |= REBASE_INTERACTIVE_EXPLICIT;
return 0;
}
int cmd_rebase(int argc, const char **argv, const char *prefix)
{
struct rebase_options options = {
.type = REBASE_UNSPECIFIED,
.flags = REBASE_NO_QUIET,
.git_am_opt = STRBUF_INIT,
.allow_rerere_autoupdate = -1,
.allow_empty_message = 1,
};
const char *branch_name;
int ret, flags, total_argc, in_progress = 0;
@ -476,6 +648,18 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
ACTION_EDIT_TODO,
ACTION_SHOW_CURRENT_PATCH,
} action = NO_ACTION;
int committer_date_is_author_date = 0;
int ignore_date = 0;
int ignore_whitespace = 0;
const char *gpg_sign = NULL;
int opt_c = -1;
struct string_list whitespace = STRING_LIST_INIT_NODUP;
struct string_list exec = STRING_LIST_INIT_NODUP;
const char *rebase_merges = NULL;
int fork_point = -1;
struct string_list strategy_options = STRING_LIST_INIT_NODUP;
struct object_id squash_onto;
char *squash_onto_name = NULL;
struct option builtin_rebase_options[] = {
OPT_STRING(0, "onto", &options.onto_name,
N_("revision"),
@ -491,6 +675,15 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
{OPTION_NEGBIT, 'n', "no-stat", &options.flags, NULL,
N_("do not show diffstat of what changed upstream"),
PARSE_OPT_NOARG, NULL, REBASE_DIFFSTAT },
OPT_BOOL(0, "ignore-whitespace", &ignore_whitespace,
N_("passed to 'git apply'")),
OPT_BOOL(0, "signoff", &options.signoff,
N_("add a Signed-off-by: line to each commit")),
OPT_BOOL(0, "committer-date-is-author-date",
&committer_date_is_author_date,
N_("passed to 'git am'")),
OPT_BOOL(0, "ignore-date", &ignore_date,
N_("passed to 'git am'")),
OPT_BIT('f', "force-rebase", &options.flags,
N_("cherry-pick all commits, even if unchanged"),
REBASE_FORCE),
@ -511,6 +704,55 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
OPT_CMDMODE(0, "show-current-patch", &action,
N_("show the patch file being applied or merged"),
ACTION_SHOW_CURRENT_PATCH),
{ OPTION_CALLBACK, 'm', "merge", &options, NULL,
N_("use merging strategies to rebase"),
PARSE_OPT_NOARG | PARSE_OPT_NONEG,
parse_opt_merge },
{ OPTION_CALLBACK, 'i', "interactive", &options, NULL,
N_("let the user edit the list of commits to rebase"),
PARSE_OPT_NOARG | PARSE_OPT_NONEG,
parse_opt_interactive },
OPT_SET_INT('p', "preserve-merges", &options.type,
N_("try to recreate merges instead of ignoring "
"them"), REBASE_PRESERVE_MERGES),
OPT_BOOL(0, "rerere-autoupdate",
&options.allow_rerere_autoupdate,
N_("allow rerere to update index with resolved "
"conflict")),
OPT_BOOL('k', "keep-empty", &options.keep_empty,
N_("preserve empty commits during rebase")),
OPT_BOOL(0, "autosquash", &options.autosquash,
N_("move commits that begin with "
"squash!/fixup! under -i")),
{ OPTION_STRING, 'S', "gpg-sign", &gpg_sign, N_("key-id"),
N_("GPG-sign commits"),
PARSE_OPT_OPTARG, NULL, (intptr_t) "" },
OPT_STRING_LIST(0, "whitespace", &whitespace,
N_("whitespace"), N_("passed to 'git apply'")),
OPT_SET_INT('C', NULL, &opt_c, N_("passed to 'git apply'"),
REBASE_AM),
OPT_BOOL(0, "autostash", &options.autostash,
N_("automatically stash/stash pop before and after")),
OPT_STRING_LIST('x', "exec", &exec, N_("exec"),
N_("add exec lines after each commit of the "
"editable list")),
OPT_BOOL(0, "allow-empty-message",
&options.allow_empty_message,
N_("allow rebasing commits with empty messages")),
{OPTION_STRING, 'r', "rebase-merges", &rebase_merges,
N_("mode"),
N_("try to rebase merges instead of skipping them"),
PARSE_OPT_OPTARG, NULL, (intptr_t)""},
OPT_BOOL(0, "fork-point", &fork_point,
N_("use 'merge-base --fork-point' to refine upstream")),
OPT_STRING('s', "strategy", &options.strategy,
N_("strategy"), N_("use the given merge strategy")),
OPT_STRING_LIST('X', "strategy-option", &strategy_options,
N_("option"),
N_("pass the argument through to the merge "
"strategy")),
OPT_BOOL(0, "root", &options.root,
N_("rebase all reachable commits up to the root(s)")),
OPT_END(),
};
@ -696,6 +938,101 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
if (!(options.flags & REBASE_NO_QUIET))
strbuf_addstr(&options.git_am_opt, " -q");
if (committer_date_is_author_date) {
strbuf_addstr(&options.git_am_opt,
" --committer-date-is-author-date");
options.flags |= REBASE_FORCE;
}
if (ignore_whitespace)
strbuf_addstr(&options.git_am_opt, " --ignore-whitespace");
if (ignore_date) {
strbuf_addstr(&options.git_am_opt, " --ignore-date");
options.flags |= REBASE_FORCE;
}
if (options.keep_empty)
imply_interactive(&options, "--keep-empty");
if (gpg_sign) {
free(options.gpg_sign_opt);
options.gpg_sign_opt = xstrfmt("-S%s", gpg_sign);
}
if (opt_c >= 0)
strbuf_addf(&options.git_am_opt, " -C%d", opt_c);
if (whitespace.nr) {
int i;
for (i = 0; i < whitespace.nr; i++) {
const char *item = whitespace.items[i].string;
strbuf_addf(&options.git_am_opt, " --whitespace=%s",
item);
if ((!strcmp(item, "fix")) || (!strcmp(item, "strip")))
options.flags |= REBASE_FORCE;
}
}
if (exec.nr) {
int i;
imply_interactive(&options, "--exec");
strbuf_reset(&buf);
for (i = 0; i < exec.nr; i++)
strbuf_addf(&buf, "exec %s\n", exec.items[i].string);
options.cmd = xstrdup(buf.buf);
}
if (rebase_merges) {
if (!*rebase_merges)
; /* default mode; do nothing */
else if (!strcmp("rebase-cousins", rebase_merges))
options.rebase_cousins = 1;
else if (strcmp("no-rebase-cousins", rebase_merges))
die(_("Unknown mode: %s"), rebase_merges);
options.rebase_merges = 1;
imply_interactive(&options, "--rebase-merges");
}
if (strategy_options.nr) {
int i;
if (!options.strategy)
options.strategy = "recursive";
strbuf_reset(&buf);
for (i = 0; i < strategy_options.nr; i++)
strbuf_addf(&buf, " --%s",
strategy_options.items[i].string);
options.strategy_opts = xstrdup(buf.buf);
}
if (options.strategy) {
options.strategy = xstrdup(options.strategy);
switch (options.type) {
case REBASE_AM:
die(_("--strategy requires --merge or --interactive"));
case REBASE_MERGE:
case REBASE_INTERACTIVE:
case REBASE_PRESERVE_MERGES:
/* compatible */
break;
case REBASE_UNSPECIFIED:
options.type = REBASE_MERGE;
break;
default:
BUG("unhandled rebase type (%d)", options.type);
}
}
if (options.root && !options.onto_name)
imply_interactive(&options, "--root without --onto");
switch (options.type) {
case REBASE_MERGE:
case REBASE_INTERACTIVE:
@ -712,6 +1049,14 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
break;
}
if (options.signoff) {
if (options.type == REBASE_PRESERVE_MERGES)
die("cannot combine '--signoff' with "
"'--preserve-merges'");
strbuf_addstr(&options.git_am_opt, " --signoff");
options.flags |= REBASE_FORCE;
}
if (!options.root) {
if (argc < 1)
die("TODO: handle @{upstream}");
@ -726,8 +1071,22 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
if (!options.upstream)
die(_("invalid upstream '%s'"), options.upstream_name);
options.upstream_arg = options.upstream_name;
} else
die("TODO: upstream for --root");
} else {
if (!options.onto_name) {
if (commit_tree("", 0, the_hash_algo->empty_tree, NULL,
&squash_onto, NULL, NULL) < 0)
die(_("Could not create new root commit"));
options.squash_onto = &squash_onto;
options.onto_name = squash_onto_name =
xstrdup(oid_to_hex(&squash_onto));
}
options.upstream_name = NULL;
options.upstream = NULL;
if (argc > 1)
usage_with_options(builtin_rebase_usage,
builtin_rebase_options);
options.upstream_arg = "--root";
}
/* Make sure the branch to rebase onto is valid. */
if (!options.onto_name)
@ -790,9 +1149,73 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
} else
BUG("unexpected number of arguments left to parse");
if (fork_point > 0) {
struct commit *head =
lookup_commit_reference(the_repository,
&options.orig_head);
options.restrict_revision =
get_fork_point(options.upstream_name, head);
}
if (read_index(the_repository->index) < 0)
die(_("could not read index"));
if (options.autostash) {
struct lock_file lock_file = LOCK_INIT;
int fd;
fd = hold_locked_index(&lock_file, 0);
refresh_cache(REFRESH_QUIET);
if (0 <= fd)
update_index_if_able(&the_index, &lock_file);
rollback_lock_file(&lock_file);
if (has_unstaged_changes(0) || has_uncommitted_changes(0)) {
const char *autostash =
state_dir_path("autostash", &options);
struct child_process stash = CHILD_PROCESS_INIT;
struct object_id oid;
struct commit *head =
lookup_commit_reference(the_repository,
&options.orig_head);
argv_array_pushl(&stash.args,
"stash", "create", "autostash", NULL);
stash.git_cmd = 1;
stash.no_stdin = 1;
strbuf_reset(&buf);
if (capture_command(&stash, &buf, GIT_MAX_HEXSZ))
die(_("Cannot autostash"));
strbuf_trim_trailing_newline(&buf);
if (get_oid(buf.buf, &oid))
die(_("Unexpected stash response: '%s'"),
buf.buf);
strbuf_reset(&buf);
strbuf_add_unique_abbrev(&buf, &oid, DEFAULT_ABBREV);
if (safe_create_leading_directories_const(autostash))
die(_("Could not create directory for '%s'"),
options.state_dir);
write_file(autostash, "%s", buf.buf);
printf(_("Created autostash: %s\n"), buf.buf);
if (reset_head(&head->object.oid, "reset --hard",
NULL, 0) < 0)
die(_("could not reset --hard"));
printf(_("HEAD is now at %s"),
find_unique_abbrev(&head->object.oid,
DEFAULT_ABBREV));
strbuf_reset(&buf);
pp_commit_easy(CMIT_FMT_ONELINE, head, &buf);
if (buf.len > 0)
printf(" %s", buf.buf);
putchar('\n');
if (discard_index(the_repository->index) < 0 ||
read_index(the_repository->index) < 0)
die(_("could not read index"));
}
}
if (require_clean_work_tree("rebase",
_("Please commit or stash them."), 1, 1)) {
ret = 1;
@ -811,6 +1234,7 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
*/
if (can_fast_forward(options.onto, &options.orig_head, &merge_base) &&
!is_interactive(&options) && !options.restrict_revision &&
options.upstream &&
!oidcmp(&options.upstream->object.oid, &options.onto->object.oid)) {
int flag;
@ -885,6 +1309,9 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
diff_flush(&opts);
}
if (is_interactive(&options))
goto run_rebase;
/* Detach HEAD and reset the tree */
if (options.flags & REBASE_NO_QUIET)
printf(_("First, rewinding head to replay your work on top of "
@ -910,5 +1337,8 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
cleanup:
strbuf_release(&revisions);
free(options.head_name);
free(options.gpg_sign_opt);
free(options.cmd);
free(squash_onto_name);
return ret;
}

82
commit.c
View File

@ -17,6 +17,8 @@
#include "sha1-lookup.h"
#include "wt-status.h"
#include "advice.h"
#include "refs.h"
#include "commit-reach.h"
static struct commit_extra_header *read_commit_extra_header_lines(const char *buf, size_t len, const char **);
@ -843,6 +845,86 @@ void sort_in_topological_order(struct commit_list **list, enum rev_sort_order so
clear_author_date_slab(&author_date);
}
struct rev_collect {
struct commit **commit;
int nr;
int alloc;
unsigned int initial : 1;
};
static void add_one_commit(struct object_id *oid, struct rev_collect *revs)
{
struct commit *commit;
if (is_null_oid(oid))
return;
commit = lookup_commit(the_repository, oid);
if (!commit ||
(commit->object.flags & TMP_MARK) ||
parse_commit(commit))
return;
ALLOC_GROW(revs->commit, revs->nr + 1, revs->alloc);
revs->commit[revs->nr++] = commit;
commit->object.flags |= TMP_MARK;
}
static int collect_one_reflog_ent(struct object_id *ooid, struct object_id *noid,
const char *ident, timestamp_t timestamp,
int tz, const char *message, void *cbdata)
{
struct rev_collect *revs = cbdata;
if (revs->initial) {
revs->initial = 0;
add_one_commit(ooid, revs);
}
add_one_commit(noid, revs);
return 0;
}
struct commit *get_fork_point(const char *refname, struct commit *commit)
{
struct object_id oid;
struct rev_collect revs;
struct commit_list *bases;
int i;
struct commit *ret = NULL;
memset(&revs, 0, sizeof(revs));
revs.initial = 1;
for_each_reflog_ent(refname, collect_one_reflog_ent, &revs);
if (!revs.nr && !get_oid(refname, &oid))
add_one_commit(&oid, &revs);
for (i = 0; i < revs.nr; i++)
revs.commit[i]->object.flags &= ~TMP_MARK;
bases = get_merge_bases_many(commit, revs.nr, revs.commit);
/*
* There should be one and only one merge base, when we found
* a common ancestor among reflog entries.
*/
if (!bases || bases->next)
goto cleanup_return;
/* And the found one must be one of the reflog entries */
for (i = 0; i < revs.nr; i++)
if (&bases->item->object == &revs.commit[i]->object)
break; /* found */
if (revs.nr <= i)
goto cleanup_return;
ret = bases->item;
cleanup_return:
free_commit_list(bases);
return ret;
}
static const char gpg_sig_header[] = "gpgsig";
static const int gpg_sig_header_len = sizeof(gpg_sig_header) - 1;

2
commit.h
View File

@ -205,6 +205,8 @@ int register_commit_graft(struct repository *r, struct commit_graft *, int);
void prepare_commit_graft(struct repository *r);
struct commit_graft *lookup_commit_graft(struct repository *r, const struct object_id *oid);
struct commit *get_fork_point(const char *refname, struct commit *commit);
/* largest positive number a signed 32-bit integer can contain */
#define INFINITE_DEPTH 0x7fffffff