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9dba809a69
git/builtin/rebase.c
Pratik Karki 9dba809a69 builtin rebase: support --root 
This option allows to rebase entire histories up to, and including, the
root commit.

The conversion from the shell script is straight-forward, apart from
the fact that we do not have to write an empty tree in C.

Signed-off-by: Pratik Karki <predatoramigo@gmail.com>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-10-11 14:12:45 +09:00

1344 lines
38 KiB
C
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/*
* "git rebase" builtin command
*
* Copyright (c) 2018 Pratik Karki
*/
#include "builtin.h"
#include "run-command.h"
#include "exec-cmd.h"
#include "argv-array.h"
#include "dir.h"
#include "packfile.h"
#include "refs.h"
#include "quote.h"
#include "config.h"
#include "cache-tree.h"
#include "unpack-trees.h"
#include "lockfile.h"
#include "parse-options.h"
#include "commit.h"
#include "diff.h"
#include "wt-status.h"
#include "revision.h"
#include "rerere.h"
static char const * const builtin_rebase_usage[] = {
N_("git rebase [-i] [options] [--exec <cmd>] [--onto <newbase>] "
"[<upstream>] [<branch>]"),
N_("git rebase [-i] [options] [--exec <cmd>] [--onto <newbase>] "
"--root [<branch>]"),
N_("git rebase --continue | --abort | --skip | --edit-todo"),
NULL
};
static GIT_PATH_FUNC(apply_dir, "rebase-apply")
static GIT_PATH_FUNC(merge_dir, "rebase-merge")
enum rebase_type {
REBASE_UNSPECIFIED = -1,
REBASE_AM,
REBASE_MERGE,
REBASE_INTERACTIVE,
REBASE_PRESERVE_MERGES
};
static int use_builtin_rebase(void)
{
struct child_process cp = CHILD_PROCESS_INIT;
struct strbuf out = STRBUF_INIT;
int ret;
argv_array_pushl(&cp.args,
"config", "--bool", "rebase.usebuiltin", NULL);
cp.git_cmd = 1;
if (capture_command(&cp, &out, 6)) {
strbuf_release(&out);
return 0;
}
strbuf_trim(&out);
ret = !strcmp("true", out.buf);
strbuf_release(&out);
return ret;
}
struct rebase_options {
enum rebase_type type;
const char *state_dir;
struct commit *upstream;
const char *upstream_name;
const char *upstream_arg;
char *head_name;
struct object_id orig_head;
struct commit *onto;
const char *onto_name;
const char *revisions;
const char *switch_to;
int root;
struct object_id *squash_onto;
struct commit *restrict_revision;
int dont_finish_rebase;
enum {
REBASE_NO_QUIET = 1<<0,
REBASE_VERBOSE = 1<<1,
REBASE_DIFFSTAT = 1<<2,
REBASE_FORCE = 1<<3,
REBASE_INTERACTIVE_EXPLICIT = 1<<4,
} 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)
{
return opts->type == REBASE_INTERACTIVE ||
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)
{
static struct strbuf path = STRBUF_INIT;
static size_t prefix_len;
if (!prefix_len) {
strbuf_addf(&path, "%s/", opts->state_dir);
prefix_len = path.len;
}
strbuf_setlen(&path, prefix_len);
strbuf_addstr(&path, filename);
return path.buf;
}
/* Read one file, then strip line endings */
static int read_one(const char *path, struct strbuf *buf)
{
if (strbuf_read_file(buf, path, 0) < 0)
return error_errno(_("could not read '%s'"), path);
strbuf_trim_trailing_newline(buf);
return 0;
}
/* Initialize the rebase options from the state directory. */
static int read_basic_state(struct rebase_options *opts)
{
struct strbuf head_name = STRBUF_INIT;
struct strbuf buf = STRBUF_INIT;
struct object_id oid;
if (read_one(state_dir_path("head-name", opts), &head_name) ||
read_one(state_dir_path("onto", opts), &buf))
return -1;
opts->head_name = starts_with(head_name.buf, "refs/") ?
xstrdup(head_name.buf) : NULL;
strbuf_release(&head_name);
if (get_oid(buf.buf, &oid))
return error(_("could not get 'onto': '%s'"), buf.buf);
opts->onto = lookup_commit_or_die(&oid, buf.buf);
/*
* We always write to orig-head, but interactive rebase used to write to
* head. Fall back to reading from head to cover for the case that the
* user upgraded git with an ongoing interactive rebase.
*/
strbuf_reset(&buf);
if (file_exists(state_dir_path("orig-head", opts))) {
if (read_one(state_dir_path("orig-head", opts), &buf))
return -1;
} else if (read_one(state_dir_path("head", opts), &buf))
return -1;
if (get_oid(buf.buf, &opts->orig_head))
return error(_("invalid orig-head: '%s'"), buf.buf);
strbuf_reset(&buf);
if (read_one(state_dir_path("quiet", opts), &buf))
return -1;
if (buf.len)
opts->flags &= ~REBASE_NO_QUIET;
else
opts->flags |= REBASE_NO_QUIET;
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(opts);
close_all_packs(the_repository->objects);
/*
* We ignore errors in 'gc --auto', since the
* user should see them.
*/
run_command_v_opt(argv_gc_auto, RUN_GIT_CMD);
strbuf_addstr(&dir, opts->state_dir);
remove_dir_recursively(&dir, 0);
strbuf_release(&dir);
return 0;
}
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 void add_var(struct strbuf *buf, const char *name, const char *value)
{
if (!value)
strbuf_addf(buf, "unset %s; ", name);
else {
strbuf_addf(buf, "%s=", name);
sq_quote_buf(buf, value);
strbuf_addstr(buf, "; ");
}
}
static int run_specific_rebase(struct rebase_options *opts)
{
const char *argv[] = { NULL, NULL };
struct strbuf script_snippet = STRBUF_INIT;
int status;
const char *backend, *backend_func;
add_var(&script_snippet, "GIT_DIR", absolute_path(get_git_dir()));
add_var(&script_snippet, "state_dir", opts->state_dir);
add_var(&script_snippet, "upstream_name", opts->upstream_name);
add_var(&script_snippet, "upstream", opts->upstream ?
oid_to_hex(&opts->upstream->object.oid) : NULL);
add_var(&script_snippet, "head_name",
opts->head_name ? opts->head_name : "detached HEAD");
add_var(&script_snippet, "orig_head", oid_to_hex(&opts->orig_head));
add_var(&script_snippet, "onto", opts->onto ?
oid_to_hex(&opts->onto->object.oid) : NULL);
add_var(&script_snippet, "onto_name", opts->onto_name);
add_var(&script_snippet, "revisions", opts->revisions);
add_var(&script_snippet, "restrict_revision", opts->restrict_revision ?
oid_to_hex(&opts->restrict_revision->object.oid) : NULL);
add_var(&script_snippet, "GIT_QUIET",
opts->flags & REBASE_NO_QUIET ? "" : "t");
add_var(&script_snippet, "git_am_opt", opts->git_am_opt.buf);
add_var(&script_snippet, "verbose",
opts->flags & REBASE_VERBOSE ? "t" : "");
add_var(&script_snippet, "diffstat",
opts->flags & REBASE_DIFFSTAT ? "t" : "");
add_var(&script_snippet, "force_rebase",
opts->flags & REBASE_FORCE ? "t" : "");
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:
backend = "git-rebase--am";
backend_func = "git_rebase__am";
break;
case REBASE_INTERACTIVE:
backend = "git-rebase--interactive";
backend_func = "git_rebase__interactive";
break;
case REBASE_MERGE:
backend = "git-rebase--merge";
backend_func = "git_rebase__merge";
break;
case REBASE_PRESERVE_MERGES:
backend = "git-rebase--preserve-merges";
backend_func = "git_rebase__preserve_merges";
break;
default:
BUG("Unhandled rebase type %d", opts->type);
break;
}
strbuf_addf(&script_snippet,
". git-sh-setup && . git-rebase--common &&"
" . %s && %s", backend, backend_func);
argv[0] = script_snippet.buf;
status = run_command_v_opt(argv, RUN_USING_SHELL);
if (opts->dont_finish_rebase)
; /* do nothing */
else if (status == 0) {
if (!file_exists(state_dir_path("stopped-sha", opts)))
finish_rebase(opts);
} else if (status == 2) {
struct strbuf dir = STRBUF_INIT;
apply_autostash(opts);
strbuf_addstr(&dir, opts->state_dir);
remove_dir_recursively(&dir, 0);
strbuf_release(&dir);
die("Nothing to do");
}
strbuf_release(&script_snippet);
return status ? -1 : 0;
}
#define GIT_REFLOG_ACTION_ENVIRONMENT "GIT_REFLOG_ACTION"
static int reset_head(struct object_id *oid, const char *action,
const char *switch_to_branch, int detach_head)
{
struct object_id head_oid;
struct tree_desc desc;
struct lock_file lock = LOCK_INIT;
struct unpack_trees_options unpack_tree_opts;
struct tree *tree;
const char *reflog_action;
struct strbuf msg = STRBUF_INIT;
size_t prefix_len;
struct object_id *orig = NULL, oid_orig,
*old_orig = NULL, oid_old_orig;
int ret = 0;
if (switch_to_branch && !starts_with(switch_to_branch, "refs/"))
BUG("Not a fully qualified branch: '%s'", switch_to_branch);
if (hold_locked_index(&lock, LOCK_REPORT_ON_ERROR) < 0)
return -1;
if (!oid) {
if (get_oid("HEAD", &head_oid)) {
rollback_lock_file(&lock);
return error(_("could not determine HEAD revision"));
}
oid = &head_oid;
}
memset(&unpack_tree_opts, 0, sizeof(unpack_tree_opts));
setup_unpack_trees_porcelain(&unpack_tree_opts, action);
unpack_tree_opts.head_idx = 1;
unpack_tree_opts.src_index = the_repository->index;
unpack_tree_opts.dst_index = the_repository->index;
unpack_tree_opts.fn = oneway_merge;
unpack_tree_opts.update = 1;
unpack_tree_opts.merge = 1;
if (!detach_head)
unpack_tree_opts.reset = 1;
if (read_index_unmerged(the_repository->index) < 0) {
rollback_lock_file(&lock);
return error(_("could not read index"));
}
if (!fill_tree_descriptor(&desc, oid)) {
error(_("failed to find tree of %s"), oid_to_hex(oid));
rollback_lock_file(&lock);
free((void *)desc.buffer);
return -1;
}
if (unpack_trees(1, &desc, &unpack_tree_opts)) {
rollback_lock_file(&lock);
free((void *)desc.buffer);
return -1;
}
tree = parse_tree_indirect(oid);
prime_cache_tree(the_repository->index, tree);
if (write_locked_index(the_repository->index, &lock, COMMIT_LOCK) < 0)
ret = error(_("could not write index"));
free((void *)desc.buffer);
if (ret)
return ret;
reflog_action = getenv(GIT_REFLOG_ACTION_ENVIRONMENT);
strbuf_addf(&msg, "%s: ", reflog_action ? reflog_action : "rebase");
prefix_len = msg.len;
if (!get_oid("ORIG_HEAD", &oid_old_orig))
old_orig = &oid_old_orig;
if (!get_oid("HEAD", &oid_orig)) {
orig = &oid_orig;
strbuf_addstr(&msg, "updating ORIG_HEAD");
update_ref(msg.buf, "ORIG_HEAD", orig, old_orig, 0,
UPDATE_REFS_MSG_ON_ERR);
} else if (old_orig)
delete_ref(NULL, "ORIG_HEAD", old_orig, 0);
strbuf_setlen(&msg, prefix_len);
strbuf_addstr(&msg, "updating HEAD");
if (!switch_to_branch)
ret = update_ref(msg.buf, "HEAD", oid, orig, REF_NO_DEREF,
UPDATE_REFS_MSG_ON_ERR);
else {
ret = create_symref("HEAD", switch_to_branch, msg.buf);
if (!ret)
ret = update_ref(msg.buf, "HEAD", oid, NULL, 0,
UPDATE_REFS_MSG_ON_ERR);
}
strbuf_release(&msg);
return ret;
}
static int rebase_config(const char *var, const char *value, void *data)
{
struct rebase_options *opts = data;
if (!strcmp(var, "rebase.stat")) {
if (git_config_bool(var, value))
opts->flags |= REBASE_DIFFSTAT;
else
opts->flags &= !REBASE_DIFFSTAT;
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);
}
/*
* Determines whether the commits in from..to are linear, i.e. contain
* no merge commits. This function *expects* `from` to be an ancestor of
* `to`.
*/
static int is_linear_history(struct commit *from, struct commit *to)
{
while (to && to != from) {
parse_commit(to);
if (!to->parents)
return 1;
if (to->parents->next)
return 0;
to = to->parents->item;
}
return 1;
}
static int can_fast_forward(struct commit *onto, struct object_id *head_oid,
struct object_id *merge_base)
{
struct commit *head = lookup_commit(the_repository, head_oid);
struct commit_list *merge_bases;
int res;
if (!head)
return 0;
merge_bases = get_merge_bases(onto, head);
if (merge_bases && !merge_bases->next) {
oidcpy(merge_base, &merge_bases->item->object.oid);
res = !oidcmp(merge_base, &onto->object.oid);
} else {
oidcpy(merge_base, &null_oid);
res = 0;
}
free_commit_list(merge_bases);
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;
int ok_to_skip_pre_rebase = 0;
struct strbuf msg = STRBUF_INIT;
struct strbuf revisions = STRBUF_INIT;
struct strbuf buf = STRBUF_INIT;
struct object_id merge_base;
enum {
NO_ACTION,
ACTION_CONTINUE,
ACTION_SKIP,
ACTION_ABORT,
ACTION_QUIT,
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"),
N_("rebase onto given branch instead of upstream")),
OPT_BOOL(0, "no-verify", &ok_to_skip_pre_rebase,
N_("allow pre-rebase hook to run")),
OPT_NEGBIT('q', "quiet", &options.flags,
N_("be quiet. implies --no-stat"),
REBASE_NO_QUIET| REBASE_VERBOSE | REBASE_DIFFSTAT),
OPT_BIT('v', "verbose", &options.flags,
N_("display a diffstat of what changed upstream"),
REBASE_NO_QUIET | REBASE_VERBOSE | REBASE_DIFFSTAT),
{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),
OPT_BIT(0, "no-ff", &options.flags,
N_("cherry-pick all commits, even if unchanged"),
REBASE_FORCE),
OPT_CMDMODE(0, "continue", &action, N_("continue"),
ACTION_CONTINUE),
OPT_CMDMODE(0, "skip", &action,
N_("skip current patch and continue"), ACTION_SKIP),
OPT_CMDMODE(0, "abort", &action,
N_("abort and check out the original branch"),
ACTION_ABORT),
OPT_CMDMODE(0, "quit", &action,
N_("abort but keep HEAD where it is"), ACTION_QUIT),
OPT_CMDMODE(0, "edit-todo", &action, N_("edit the todo list "
"during an interactive rebase"), ACTION_EDIT_TODO),
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(),
};
/*
* NEEDSWORK: Once the builtin rebase has been tested enough
* and git-legacy-rebase.sh is retired to contrib/, this preamble
* can be removed.
*/
if (!use_builtin_rebase()) {
const char *path = mkpath("%s/git-legacy-rebase",
git_exec_path());
if (sane_execvp(path, (char **)argv) < 0)
die_errno(_("could not exec %s"), path);
else
BUG("sane_execvp() returned???");
}
if (argc == 2 && !strcmp(argv[1], "-h"))
usage_with_options(builtin_rebase_usage,
builtin_rebase_options);
prefix = setup_git_directory();
trace_repo_setup(prefix);
setup_work_tree();
git_config(rebase_config, &options);
strbuf_reset(&buf);
strbuf_addf(&buf, "%s/applying", apply_dir());
if(file_exists(buf.buf))
die(_("It looks like 'git am' is in progress. Cannot rebase."));
if (is_directory(apply_dir())) {
options.type = REBASE_AM;
options.state_dir = apply_dir();
} else if (is_directory(merge_dir())) {
strbuf_reset(&buf);
strbuf_addf(&buf, "%s/rewritten", merge_dir());
if (is_directory(buf.buf)) {
options.type = REBASE_PRESERVE_MERGES;
options.flags |= REBASE_INTERACTIVE_EXPLICIT;
} else {
strbuf_reset(&buf);
strbuf_addf(&buf, "%s/interactive", merge_dir());
if(file_exists(buf.buf)) {
options.type = REBASE_INTERACTIVE;
options.flags |= REBASE_INTERACTIVE_EXPLICIT;
} else
options.type = REBASE_MERGE;
}
options.state_dir = merge_dir();
}
if (options.type != REBASE_UNSPECIFIED)
in_progress = 1;
total_argc = argc;
argc = parse_options(argc, argv, prefix,
builtin_rebase_options,
builtin_rebase_usage, 0);
if (action != NO_ACTION && total_argc != 2) {
usage_with_options(builtin_rebase_usage,
builtin_rebase_options);
}
if (argc > 2)
usage_with_options(builtin_rebase_usage,
builtin_rebase_options);
if (action != NO_ACTION && !in_progress)
die(_("No rebase in progress?"));
if (action == ACTION_EDIT_TODO && !is_interactive(&options))
die(_("The --edit-todo action can only be used during "
"interactive rebase."));
switch (action) {
case ACTION_CONTINUE: {
struct object_id head;
struct lock_file lock_file = LOCK_INIT;
int fd;
options.action = "continue";
/* Sanity check */
if (get_oid("HEAD", &head))
die(_("Cannot read HEAD"));
fd = hold_locked_index(&lock_file, 0);
if (read_index(the_repository->index) < 0)
die(_("could not read index"));
refresh_index(the_repository->index, REFRESH_QUIET, NULL, NULL,
NULL);
if (0 <= fd)
update_index_if_able(the_repository->index,
&lock_file);
rollback_lock_file(&lock_file);
if (has_unstaged_changes(1)) {
puts(_("You must edit all merge conflicts and then\n"
"mark them as resolved using git add"));
exit(1);
}
if (read_basic_state(&options))
exit(1);
goto run_rebase;
}
case ACTION_SKIP: {
struct string_list merge_rr = STRING_LIST_INIT_DUP;
options.action = "skip";
rerere_clear(&merge_rr);
string_list_clear(&merge_rr, 1);
if (reset_head(NULL, "reset", NULL, 0) < 0)
die(_("could not discard worktree changes"));
if (read_basic_state(&options))
exit(1);
goto run_rebase;
}
case ACTION_ABORT: {
struct string_list merge_rr = STRING_LIST_INIT_DUP;
options.action = "abort";
rerere_clear(&merge_rr);
string_list_clear(&merge_rr, 1);
if (read_basic_state(&options))
exit(1);
if (reset_head(&options.orig_head, "reset",
options.head_name, 0) < 0)
die(_("could not move back to %s"),
oid_to_hex(&options.orig_head));
ret = finish_rebase(&options);
goto cleanup;
}
case ACTION_QUIT: {
strbuf_reset(&buf);
strbuf_addstr(&buf, options.state_dir);
ret = !!remove_dir_recursively(&buf, 0);
if (ret)
die(_("could not remove '%s'"), options.state_dir);
goto cleanup;
}
case ACTION_EDIT_TODO:
options.action = "edit-todo";
options.dont_finish_rebase = 1;
goto run_rebase;
case ACTION_SHOW_CURRENT_PATCH:
options.action = "show-current-patch";
options.dont_finish_rebase = 1;
goto run_rebase;
case NO_ACTION:
break;
default:
BUG("action: %d", action);
}
/* Make sure no rebase is in progress */
if (in_progress) {
const char *last_slash = strrchr(options.state_dir, '/');
const char *state_dir_base =
last_slash ? last_slash + 1 : options.state_dir;
const char *cmd_live_rebase =
"git rebase (--continue | --abort | --skip)";
strbuf_reset(&buf);
strbuf_addf(&buf, "rm -fr \"%s\"", options.state_dir);
die(_("It seems that there is already a %s directory, and\n"
"I wonder if you are in the middle of another rebase. "
"If that is the\n"
"case, please try\n\t%s\n"
"If that is not the case, please\n\t%s\n"
"and run me again. I am stopping in case you still "
"have something\n"
"valuable there.\n"),
state_dir_base, cmd_live_rebase, buf.buf);
}
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:
case REBASE_PRESERVE_MERGES:
options.state_dir = merge_dir();
break;
case REBASE_AM:
options.state_dir = apply_dir();
break;
default:
/* the default rebase backend is `--am` */
options.type = REBASE_AM;
options.state_dir = apply_dir();
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}");
else {
options.upstream_name = argv[0];
argc--;
argv++;
if (!strcmp(options.upstream_name, "-"))
options.upstream_name = "@{-1}";
}
options.upstream = peel_committish(options.upstream_name);
if (!options.upstream)
die(_("invalid upstream '%s'"), options.upstream_name);
options.upstream_arg = options.upstream_name;
} 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)
options.onto_name = options.upstream_name;
if (strstr(options.onto_name, "...")) {
if (get_oid_mb(options.onto_name, &merge_base) < 0)
die(_("'%s': need exactly one merge base"),
options.onto_name);
options.onto = lookup_commit_or_die(&merge_base,
options.onto_name);
} else {
options.onto = peel_committish(options.onto_name);
if (!options.onto)
die(_("Does not point to a valid commit '%s'"),
options.onto_name);
}
/*
* If the branch to rebase is given, that is the branch we will rebase
* branch_name -- branch/commit being rebased, or
* HEAD (already detached)
* orig_head -- commit object name of tip of the branch before rebasing
* head_name -- refs/heads/<that-branch> or NULL (detached HEAD)
*/
if (argc == 1) {
/* Is it "rebase other branchname" or "rebase other commit"? */
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))
options.head_name = xstrdup(buf.buf);
/* If not is it a valid ref (branch or commit)? */
else if (!get_oid(branch_name, &options.orig_head))
options.head_name = NULL;
else
die(_("fatal: 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 =
xstrdup_or_null(resolve_ref_unsafe("HEAD", 0, NULL,
&flags));
if (!options.head_name)
die(_("No such ref: %s"), "HEAD");
if (flags & REF_ISSYMREF) {
if (!skip_prefix(options.head_name,
"refs/heads/", &branch_name))
branch_name = options.head_name;
} else {
free(options.head_name);
options.head_name = NULL;
branch_name = "HEAD";
}
if (get_oid("HEAD", &options.orig_head))
die(_("Could not resolve HEAD to a revision"));
} 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;
goto cleanup;
}
/*
* Now we are rebasing commits upstream..orig_head (or with --root,
* everything leading up to orig_head) on top of onto.
*/
/*
* Check if we are already based on onto with linear history,
* but this should be done only when upstream and onto are the same
* and if this is not an interactive rebase.
*/
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;
if (!(options.flags & REBASE_FORCE)) {
/* Lazily switch to the target branch if needed... */
if (options.switch_to) {
struct object_id oid;
if (get_oid(options.switch_to, &oid) < 0) {
ret = !!error(_("could not parse '%s'"),
options.switch_to);
goto cleanup;
}
strbuf_reset(&buf);
strbuf_addf(&buf, "rebase: checkout %s",
options.switch_to);
if (reset_head(&oid, "checkout",
options.head_name, 0) < 0) {
ret = !!error(_("could not switch to "
"%s"),
options.switch_to);
goto cleanup;
}
}
if (!(options.flags & REBASE_NO_QUIET))
; /* be quiet */
else if (!strcmp(branch_name, "HEAD") &&
resolve_ref_unsafe("HEAD", 0, NULL, &flag))
puts(_("HEAD is up to date."));
else
printf(_("Current branch %s is up to date.\n"),
branch_name);
ret = !!finish_rebase(&options);
goto cleanup;
} else if (!(options.flags & REBASE_NO_QUIET))
; /* be quiet */
else if (!strcmp(branch_name, "HEAD") &&
resolve_ref_unsafe("HEAD", 0, NULL, &flag))
puts(_("HEAD is up to date, rebase forced."));
else
printf(_("Current branch %s is up to date, rebase "
"forced.\n"), branch_name);
}
/* If a hook exists, give it a chance to interrupt*/
if (!ok_to_skip_pre_rebase &&
run_hook_le(NULL, "pre-rebase", options.upstream_arg,
argc ? argv[0] : NULL, NULL))
die(_("The pre-rebase hook refused to rebase."));
if (options.flags & REBASE_DIFFSTAT) {
struct diff_options opts;
if (options.flags & REBASE_VERBOSE)
printf(_("Changes from %s to %s:\n"),
oid_to_hex(&merge_base),
oid_to_hex(&options.onto->object.oid));
/* We want color (if set), but no pager */
diff_setup(&opts);
opts.stat_width = -1; /* use full terminal width */
opts.stat_graph_width = -1; /* respect statGraphWidth config */
opts.output_format |=
DIFF_FORMAT_SUMMARY | DIFF_FORMAT_DIFFSTAT;
opts.detect_rename = DIFF_DETECT_RENAME;
diff_setup_done(&opts);
diff_tree_oid(&merge_base, &options.onto->object.oid,
"", &opts);
diffcore_std(&opts);
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 "
"it...\n"));
strbuf_addf(&msg, "rebase: checkout %s", options.onto_name);
if (reset_head(&options.onto->object.oid, "checkout", NULL, 1))
die(_("Could not detach HEAD"));
strbuf_release(&msg);
strbuf_addf(&revisions, "%s..%s",
options.root ? oid_to_hex(&options.onto->object.oid) :
(options.restrict_revision ?
oid_to_hex(&options.restrict_revision->object.oid) :
oid_to_hex(&options.upstream->object.oid)),
oid_to_hex(&options.orig_head));
options.revisions = revisions.buf;
run_rebase:
ret = !!run_specific_rebase(&options);
cleanup:
strbuf_release(&revisions);
free(options.head_name);
free(options.gpg_sign_opt);
free(options.cmd);
free(squash_onto_name);
return ret;
}
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