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Merge branch 'en/merge-ort-api-null-impl'

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Preparation for a new merge strategy.

* en/merge-ort-api-null-impl:
  merge,rebase,revert: select ort or recursive by config or environment
  fast-rebase: demonstrate merge-ort's API via new test-tool command
  merge-ort-wrappers: new convience wrappers to mimic the old merge API
  merge-ort: barebones API of new merge strategy with empty implementation
This commit is contained in:
Junio C Hamano 2020-11-18 13:32:53 -08:00
commit a1f95951ef
13 changed files with 517 additions and 15 deletions
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3
Makefile
View File

@ -705,6 +705,7 @@ TEST_BUILTINS_OBJS += test-dump-fsmonitor.o
TEST_BUILTINS_OBJS += test-dump-split-index.o
TEST_BUILTINS_OBJS += test-dump-untracked-cache.o
TEST_BUILTINS_OBJS += test-example-decorate.o
TEST_BUILTINS_OBJS += test-fast-rebase.o
TEST_BUILTINS_OBJS += test-genrandom.o
TEST_BUILTINS_OBJS += test-genzeros.o
TEST_BUILTINS_OBJS += test-hash-speed.o
@ -922,6 +923,8 @@ LIB_OBJS += mailmap.o
LIB_OBJS += match-trees.o
LIB_OBJS += mem-pool.o
LIB_OBJS += merge-blobs.o
LIB_OBJS += merge-ort.o
LIB_OBJS += merge-ort-wrappers.o
LIB_OBJS += merge-recursive.o
LIB_OBJS += merge.o
LIB_OBJS += mergesort.o

26
builtin/merge.c
View File

@ -28,6 +28,7 @@
#include "rerere.h"
#include "help.h"
#include "merge-recursive.h"
#include "merge-ort-wrappers.h"
#include "resolve-undo.h"
#include "remote.h"
#include "fmt-merge-msg.h"
@ -88,6 +89,7 @@ static int no_verify;
static struct strategy all_strategy[] = {
{ "recursive", DEFAULT_TWOHEAD | NO_TRIVIAL },
{ "octopus", DEFAULT_OCTOPUS },
{ "ort", NO_TRIVIAL },
{ "resolve", 0 },
{ "ours", NO_FAST_FORWARD | NO_TRIVIAL },
{ "subtree", NO_FAST_FORWARD | NO_TRIVIAL },
@ -159,10 +161,17 @@ static struct strategy *get_strategy(const char *name)
struct strategy *ret;
static struct cmdnames main_cmds, other_cmds;
static int loaded;
char *default_strategy = getenv("GIT_TEST_MERGE_ALGORITHM");
if (!name)
return NULL;
if (default_strategy &&
!strcmp(default_strategy, "ort") &&
!strcmp(name, "recursive")) {
name = "ort";
}
for (i = 0; i < ARRAY_SIZE(all_strategy); i++)
if (!strcmp(name, all_strategy[i].name))
return &all_strategy[i];
@ -701,7 +710,8 @@ static int try_merge_strategy(const char *strategy, struct commit_list *common,
if (refresh_and_write_cache(REFRESH_QUIET, SKIP_IF_UNCHANGED, 0) < 0)
return error(_("Unable to write index."));
if (!strcmp(strategy, "recursive") || !strcmp(strategy, "subtree")) {
if (!strcmp(strategy, "recursive") || !strcmp(strategy, "subtree") ||
!strcmp(strategy, "ort")) {
struct lock_file lock = LOCK_INIT;
int clean, x;
struct commit *result;
@ -732,8 +742,12 @@ static int try_merge_strategy(const char *strategy, struct commit_list *common,
commit_list_insert(j->item, &reversed);
hold_locked_index(&lock, LOCK_DIE_ON_ERROR);
clean = merge_recursive(&o, head,
remoteheads->item, reversed, &result);
if (!strcmp(strategy, "ort"))
clean = merge_ort_recursive(&o, head, remoteheads->item,
reversed, &result);
else
clean = merge_recursive(&o, head, remoteheads->item,
reversed, &result);
if (clean < 0)
exit(128);
if (write_locked_index(&the_index, &lock,
@ -1264,6 +1278,12 @@ int cmd_merge(int argc, const char **argv, const char *prefix)
if (branch)
skip_prefix(branch, "refs/heads/", &branch);
if (!pull_twohead) {
char *default_strategy = getenv("GIT_TEST_MERGE_ALGORITHM");
if (default_strategy && !strcmp(default_strategy, "ort"))
pull_twohead = "ort";
}
init_diff_ui_defaults();
git_config(git_merge_config, NULL);

13
builtin/rebase.c
View File

@ -119,6 +119,7 @@ static struct replay_opts get_replay_opts(const struct rebase_options *opts)
struct replay_opts replay = REPLAY_OPTS_INIT;
replay.action = REPLAY_INTERACTIVE_REBASE;
replay.strategy = NULL;
sequencer_init_config(&replay);
replay.signoff = opts->signoff;
@ -136,7 +137,12 @@ static struct replay_opts get_replay_opts(const struct rebase_options *opts)
opts->committer_date_is_author_date;
replay.ignore_date = opts->ignore_date;
replay.gpg_sign = xstrdup_or_null(opts->gpg_sign_opt);
replay.strategy = opts->strategy;
if (opts->strategy)
replay.strategy = opts->strategy;
else if (!replay.strategy && replay.default_strategy) {
replay.strategy = replay.default_strategy;
replay.default_strategy = NULL;
}
if (opts->strategy_opts)
parse_strategy_opts(&replay, opts->strategy_opts);
@ -1771,6 +1777,11 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
options.default_backend);
}
if (options.type == REBASE_MERGE &&
!options.strategy &&
getenv("GIT_TEST_MERGE_ALGORITHM"))
options.strategy = xstrdup(getenv("GIT_TEST_MERGE_ALGORITHM"));
switch (options.type) {
case REBASE_MERGE:
case REBASE_PRESERVE_MERGES:

7
builtin/revert.c
View File

@ -172,6 +172,11 @@ static int run_sequencer(int argc, const char **argv, struct replay_opts *opts)
NULL);
}
if (!opts->strategy && opts->default_strategy) {
opts->strategy = opts->default_strategy;
opts->default_strategy = NULL;
}
if (opts->allow_ff)
verify_opt_compatible(me, "--ff",
"--signoff", opts->signoff,
@ -202,6 +207,8 @@ static int run_sequencer(int argc, const char **argv, struct replay_opts *opts)
/* These option values will be free()d */
opts->gpg_sign = xstrdup_or_null(opts->gpg_sign);
opts->strategy = xstrdup_or_null(opts->strategy);
if (!opts->strategy && getenv("GIT_TEST_MERGE_ALGORITHM"))
opts->strategy = xstrdup(getenv("GIT_TEST_MERGE_ALGORITHM"));
if (cmd == 'q') {
int ret = sequencer_remove_state(opts);

62
merge-ort-wrappers.c Normal file
View File

@ -0,0 +1,62 @@
#include "cache.h"
#include "merge-ort.h"
#include "merge-ort-wrappers.h"
#include "commit.h"
static int unclean(struct merge_options *opt, struct tree *head)
{
/* Sanity check on repo state; index must match head */
struct strbuf sb = STRBUF_INIT;
if (head && repo_index_has_changes(opt->repo, head, &sb)) {
fprintf(stderr, _("Your local changes to the following files would be overwritten by merge:\n %s"),
sb.buf);
strbuf_release(&sb);
return -1;
}
return 0;
}
int merge_ort_nonrecursive(struct merge_options *opt,
struct tree *head,
struct tree *merge,
struct tree *merge_base)
{
struct merge_result result;
if (unclean(opt, head))
return -1;
if (oideq(&merge_base->object.oid, &merge->object.oid)) {
printf(_("Already up to date!"));
return 1;
}
memset(&result, 0, sizeof(result));
merge_incore_nonrecursive(opt, merge_base, head, merge, &result);
merge_switch_to_result(opt, head, &result, 1, 1);
return result.clean;
}
int merge_ort_recursive(struct merge_options *opt,
struct commit *side1,
struct commit *side2,
struct commit_list *merge_bases,
struct commit **result)
{
struct tree *head = repo_get_commit_tree(opt->repo, side1);
struct merge_result tmp;
if (unclean(opt, head))
return -1;
memset(&tmp, 0, sizeof(tmp));
merge_incore_recursive(opt, merge_bases, side1, side2, &tmp);
merge_switch_to_result(opt, head, &tmp, 1, 1);
*result = NULL;
return tmp.clean;
}

25
merge-ort-wrappers.h Normal file
View File

@ -0,0 +1,25 @@
#ifndef MERGE_ORT_WRAPPERS_H
#define MERGE_ORT_WRAPPERS_H
#include "merge-recursive.h"
/*
* rename-detecting three-way merge, no recursion.
* Wrapper mimicking the old merge_trees() function.
*/
int merge_ort_nonrecursive(struct merge_options *opt,
struct tree *head,
struct tree *merge,
struct tree *common);
/*
* rename-detecting three-way merge with recursive ancestor consolidation.
* Wrapper mimicking the old merge_recursive() function.
*/
int merge_ort_recursive(struct merge_options *opt,
struct commit *h1,
struct commit *h2,
struct commit_list *ancestors,
struct commit **result);
#endif

52
merge-ort.c Normal file
View File

@ -0,0 +1,52 @@
/*
* "Ostensibly Recursive's Twin" merge strategy, or "ort" for short. Meant
* as a drop-in replacement for the "recursive" merge strategy, allowing one
* to replace
*
* git merge [-s recursive]
*
* with
*
* git merge -s ort
*
* Note: git's parser allows the space between '-s' and its argument to be
* missing. (Should I have backronymed "ham", "alsa", "kip", "nap, "alvo",
* "cale", "peedy", or "ins" instead of "ort"?)
*/
#include "cache.h"
#include "merge-ort.h"
void merge_switch_to_result(struct merge_options *opt,
struct tree *head,
struct merge_result *result,
int update_worktree_and_index,
int display_update_msgs)
{
die("Not yet implemented");
merge_finalize(opt, result);
}
void merge_finalize(struct merge_options *opt,
struct merge_result *result)
{
die("Not yet implemented");
}
void merge_incore_nonrecursive(struct merge_options *opt,
struct tree *merge_base,
struct tree *side1,
struct tree *side2,
struct merge_result *result)
{
die("Not yet implemented");
}
void merge_incore_recursive(struct merge_options *opt,
struct commit_list *merge_bases,
struct commit *side1,
struct commit *side2,
struct merge_result *result)
{
die("Not yet implemented");
}

58
merge-ort.h Normal file
View File

@ -0,0 +1,58 @@
#ifndef MERGE_ORT_H
#define MERGE_ORT_H
#include "merge-recursive.h"
struct commit;
struct tree;
struct merge_result {
/* Whether the merge is clean */
int clean;
/*
* Result of merge. If !clean, represents what would go in worktree
* (thus possibly including files containing conflict markers).
*/
struct tree *tree;
/*
* Additional metadata used by merge_switch_to_result() or future calls
* to merge_incore_*(). Includes data needed to update the index (if
* !clean) and to print "CONFLICT" messages. Not for external use.
*/
void *priv;
};
/*
* rename-detecting three-way merge with recursive ancestor consolidation.
* working tree and index are untouched.
*/
void merge_incore_recursive(struct merge_options *opt,
struct commit_list *merge_bases,
struct commit *side1,
struct commit *side2,
struct merge_result *result);
/*
* rename-detecting three-way merge, no recursion.
* working tree and index are untouched.
*/
void merge_incore_nonrecursive(struct merge_options *opt,
struct tree *merge_base,
struct tree *side1,
struct tree *side2,
struct merge_result *result);
/* Update the working tree and index from head to result after incore merge */
void merge_switch_to_result(struct merge_options *opt,
struct tree *head,
struct merge_result *result,
int update_worktree_and_index,
int display_update_msgs);
/* Do needed cleanup when not calling merge_switch_to_result() */
void merge_finalize(struct merge_options *opt,
struct merge_result *result);
#endif

72
sequencer.c
View File

@ -14,7 +14,8 @@
#include "diff.h"
#include "revision.h"
#include "rerere.h"
#include "merge-recursive.h"
#include "merge-ort.h"
#include "merge-ort-wrappers.h"
#include "refs.h"
#include "strvec.h"
#include "quote.h"
@ -204,6 +205,20 @@ static int git_sequencer_config(const char *k, const char *v, void *cb)
return 0;
}
if (!opts->default_strategy && !strcmp(k, "pull.twohead")) {
int ret = git_config_string((const char**)&opts->default_strategy, k, v);
if (ret == 0) {
/*
* pull.twohead is allowed to be multi-valued; we only
* care about the first value.
*/
char *tmp = strchr(opts->default_strategy, ' ');
if (tmp)
*tmp = '\0';
}
return ret;
}
status = git_gpg_config(k, v, NULL);
if (status)
return status;
@ -315,6 +330,7 @@ int sequencer_remove_state(struct replay_opts *opts)
}
free(opts->gpg_sign);
free(opts->default_strategy);
free(opts->strategy);
for (i = 0; i < opts->xopts_nr; i++)
free(opts->xopts[i]);
@ -593,8 +609,9 @@ static int do_recursive_merge(struct repository *r,
struct replay_opts *opts)
{
struct merge_options o;
struct merge_result result;
struct tree *next_tree, *base_tree, *head_tree;
int clean;
int clean, show_output;
int i;
struct lock_file index_lock = LOCK_INIT;
@ -618,12 +635,27 @@ static int do_recursive_merge(struct repository *r,
for (i = 0; i < opts->xopts_nr; i++)
parse_merge_opt(&o, opts->xopts[i]);
clean = merge_trees(&o,
head_tree,
next_tree, base_tree);
if (is_rebase_i(opts) && clean <= 0)
fputs(o.obuf.buf, stdout);
strbuf_release(&o.obuf);
if (opts->strategy && !strcmp(opts->strategy, "ort")) {
memset(&result, 0, sizeof(result));
merge_incore_nonrecursive(&o, base_tree, head_tree, next_tree,
&result);
show_output = !is_rebase_i(opts) || !result.clean;
/*
* TODO: merge_switch_to_result will update index/working tree;
* we only really want to do that if !result.clean || this is
* the final patch to be picked. But determining this is the
* final patch would take some work, and "head_tree" would need
* to be replace with the tree the index matched before we
* started doing any picks.
*/
merge_switch_to_result(&o, head_tree, &result, 1, show_output);
clean = result.clean;
} else {
clean = merge_trees(&o, head_tree, next_tree, base_tree);
if (is_rebase_i(opts) && clean <= 0)
fputs(o.obuf.buf, stdout);
strbuf_release(&o.obuf);
}
if (clean < 0) {
rollback_lock_file(&index_lock);
return clean;
@ -1989,7 +2021,10 @@ static int do_pick_commit(struct repository *r,
if (is_rebase_i(opts) && write_author_script(msg.message) < 0)
res = -1;
else if (!opts->strategy || !strcmp(opts->strategy, "recursive") || command == TODO_REVERT) {
else if (!opts->strategy ||
!strcmp(opts->strategy, "recursive") ||
!strcmp(opts->strategy, "ort") ||
command == TODO_REVERT) {
res = do_recursive_merge(r, base, next, base_label, next_label,
&head, &msgbuf, opts);
if (res < 0)
@ -3484,7 +3519,9 @@ static int do_merge(struct repository *r,
struct commit_list *bases, *j, *reversed = NULL;
struct commit_list *to_merge = NULL, **tail = &to_merge;
const char *strategy = !opts->xopts_nr &&
(!opts->strategy || !strcmp(opts->strategy, "recursive")) ?
(!opts->strategy ||
!strcmp(opts->strategy, "recursive") ||
!strcmp(opts->strategy, "ort")) ?
NULL : opts->strategy;
struct merge_options o;
int merge_arg_len, oneline_offset, can_fast_forward, ret, k;
@ -3722,7 +3759,20 @@ static int do_merge(struct repository *r,
o.branch2 = ref_name.buf;
o.buffer_output = 2;
ret = merge_recursive(&o, head_commit, merge_commit, reversed, &i);
if (opts->strategy && !strcmp(opts->strategy, "ort")) {
/*
* TODO: Should use merge_incore_recursive() and
* merge_switch_to_result(), skipping the call to
* merge_switch_to_result() when we don't actually need to
* update the index and working copy immediately.
*/
ret = merge_ort_recursive(&o,
head_commit, merge_commit, reversed,
&i);
} else {
ret = merge_recursive(&o, head_commit, merge_commit, reversed,
&i);
}
if (ret <= 0)
fputs(o.obuf.buf, stdout);
strbuf_release(&o.obuf);

1
sequencer.h
View File

@ -55,6 +55,7 @@ struct replay_opts {
int explicit_cleanup;
/* Merge strategy */
char *default_strategy; /* from config options */
char *strategy;
char **xopts;
size_t xopts_nr, xopts_alloc;

211
t/helper/test-fast-rebase.c Normal file
View File

@ -0,0 +1,211 @@
/*
* "git fast-rebase" builtin command
*
* FAST: Forking Any Subprocesses (is) Taboo
*
* This is meant SOLELY as a demo of what is possible. sequencer.c and
* rebase.c should be refactored to use the ideas here, rather than attempting
* to extend this file to replace those (unless Phillip or Dscho say that
* refactoring is too hard and we need a clean slate, but I'm guessing that
* refactoring is the better route).
*/
#define USE_THE_INDEX_COMPATIBILITY_MACROS
#include "test-tool.h"
#include "cache-tree.h"
#include "commit.h"
#include "lockfile.h"
#include "merge-ort.h"
#include "refs.h"
#include "revision.h"
#include "sequencer.h"
#include "strvec.h"
#include "tree.h"
static const char *short_commit_name(struct commit *commit)
{
return find_unique_abbrev(&commit->object.oid, DEFAULT_ABBREV);
}
static struct commit *peel_committish(const char *name)
{
struct object *obj;
struct object_id oid;
if (get_oid(name, &oid))
return NULL;
obj = parse_object(the_repository, &oid);
return (struct commit *)peel_to_type(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;
struct commit_list *parents = NULL;
char *author;
char *sign_commit = NULL;
struct commit_extra_header *extra;
struct strbuf msg = STRBUF_INIT;
const char *out_enc = get_commit_output_encoding();
const char *message = logmsg_reencode(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"));
return NULL;
}
free(author);
strbuf_release(&msg);
obj = parse_object(the_repository, &ret);
return (struct commit *)obj;
}
int cmd__fast_rebase(int argc, const char **argv)
{
struct commit *onto;
struct commit *last_commit = NULL, *last_picked_commit = NULL;
struct object_id head;
struct lock_file lock = LOCK_INIT;
int clean = 1;
struct strvec rev_walk_args = STRVEC_INIT;
struct rev_info revs;
struct commit *commit;
struct merge_options merge_opt;
struct tree *next_tree, *base_tree, *head_tree;
struct merge_result result;
struct strbuf reflog_msg = STRBUF_INIT;
struct strbuf branch_name = STRBUF_INIT;
/*
* test-tool stuff doesn't set up the git directory by default; need to
* do that manually.
*/
setup_git_directory();
if (argc == 2 && !strcmp(argv[1], "-h")) {
printf("Sorry, I am not a psychiatrist; I can not give you the help you need. Oh, you meant usage...\n");
exit(129);
}
if (argc != 5 || strcmp(argv[1], "--onto"))
die("usage: read the code, figure out how to use it, then do so");
onto = peel_committish(argv[2]);
strbuf_addf(&branch_name, "refs/heads/%s", argv[4]);
/* Sanity check */
if (get_oid("HEAD", &head))
die(_("Cannot read HEAD"));
assert(oideq(&onto->object.oid, &head));
hold_locked_index(&lock, LOCK_DIE_ON_ERROR);
assert(repo_read_index(the_repository) >= 0);
repo_init_revisions(the_repository, &revs, NULL);
revs.verbose_header = 1;
revs.max_parents = 1;
revs.cherry_mark = 1;
revs.limited = 1;
revs.reverse = 1;
revs.right_only = 1;
revs.sort_order = REV_SORT_IN_GRAPH_ORDER;
revs.topo_order = 1;
strvec_pushl(&rev_walk_args, "", argv[4], "--not", argv[3], NULL);
if (setup_revisions(rev_walk_args.nr, rev_walk_args.v, &revs, NULL) > 1)
return error(_("unhandled options"));
strvec_clear(&rev_walk_args);
if (prepare_revision_walk(&revs) < 0)
return error(_("error preparing revisions"));
init_merge_options(&merge_opt, the_repository);
memset(&result, 0, sizeof(result));
merge_opt.show_rename_progress = 1;
merge_opt.branch1 = "HEAD";
head_tree = get_commit_tree(onto);
result.tree = head_tree;
last_commit = onto;
while ((commit = get_revision(&revs))) {
struct commit *base;
fprintf(stderr, "Rebasing %s...\r",
oid_to_hex(&commit->object.oid));
assert(commit->parents && !commit->parents->next);
base = commit->parents->item;
next_tree = get_commit_tree(commit);
base_tree = get_commit_tree(base);
merge_opt.branch2 = short_commit_name(commit);
merge_opt.ancestor = xstrfmt("parent of %s", merge_opt.branch2);
merge_incore_nonrecursive(&merge_opt,
base_tree,
result.tree,
next_tree,
&result);
free((char*)merge_opt.ancestor);
merge_opt.ancestor = NULL;
if (!result.clean)
die("Aborting: Hit a conflict and restarting is not implemented.");
last_picked_commit = commit;
last_commit = create_commit(result.tree, commit, last_commit);
}
fprintf(stderr, "\nDone.\n");
/* TODO: There should be some kind of rev_info_free(&revs) call... */
memset(&revs, 0, sizeof(revs));
merge_switch_to_result(&merge_opt, head_tree, &result, 1, !result.clean);
if (result.clean < 0)
exit(128);
strbuf_addf(&reflog_msg, "finish rebase %s onto %s",
oid_to_hex(&last_picked_commit->object.oid),
oid_to_hex(&last_commit->object.oid));
if (update_ref(reflog_msg.buf, branch_name.buf,
&last_commit->object.oid,
&last_picked_commit->object.oid,
REF_NO_DEREF, UPDATE_REFS_MSG_ON_ERR)) {
error(_("could not update %s"), argv[4]);
die("Failed to update %s", argv[4]);
}
if (create_symref("HEAD", branch_name.buf, reflog_msg.buf) < 0)
die(_("unable to update HEAD"));
strbuf_release(&reflog_msg);
strbuf_release(&branch_name);
prime_cache_tree(the_repository, the_repository->index, result.tree);
if (write_locked_index(&the_index, &lock,
COMMIT_LOCK | SKIP_IF_UNCHANGED))
die(_("unable to write %s"), get_index_file());
return (clean == 0);
}

1
t/helper/test-tool.c
View File

@ -29,6 +29,7 @@ static struct test_cmd cmds[] = {
{ "dump-split-index", cmd__dump_split_index },
{ "dump-untracked-cache", cmd__dump_untracked_cache },
{ "example-decorate", cmd__example_decorate },
{ "fast-rebase", cmd__fast_rebase },
{ "genrandom", cmd__genrandom },
{ "genzeros", cmd__genzeros },
{ "hashmap", cmd__hashmap },

1
t/helper/test-tool.h
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@ -19,6 +19,7 @@ int cmd__dump_fsmonitor(int argc, const char **argv);
int cmd__dump_split_index(int argc, const char **argv);
int cmd__dump_untracked_cache(int argc, const char **argv);
int cmd__example_decorate(int argc, const char **argv);
int cmd__fast_rebase(int argc, const char **argv);
int cmd__genrandom(int argc, const char **argv);
int cmd__genzeros(int argc, const char **argv);
int cmd__hashmap(int argc, const char **argv);