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#include "cache.h"
#include "lockfile.h"
#include "sequencer.h"
#include "dir.h"
#include "object.h"
#include "commit.h"
#include "tag.h"
#include "run-command.h"
#include "exec_cmd.h"
#include "utf8.h"
#include "cache-tree.h"
#include "diff.h"
#include "revision.h"
#include "rerere.h"
#include "merge-recursive.h"
#include "refs.h"
#include "argv-array.h"
#include "quote.h"
#define GIT_REFLOG_ACTION "GIT_REFLOG_ACTION"
const char sign_off_header[] = "Signed-off-by: ";
static const char cherry_picked_prefix[] = "(cherry picked from commit ";
GIT_PATH_FUNC(git_path_seq_dir, "sequencer")
static GIT_PATH_FUNC(git_path_todo_file, "sequencer/todo")
static GIT_PATH_FUNC(git_path_opts_file, "sequencer/opts")
static GIT_PATH_FUNC(git_path_head_file, "sequencer/head")
/*
* A script to set the GIT_AUTHOR_NAME, GIT_AUTHOR_EMAIL, and
* GIT_AUTHOR_DATE that will be used for the commit that is currently
* being rebased.
*/
static GIT_PATH_FUNC(rebase_path_author_script, "rebase-merge/author-script")
/*
* The following files are written by git-rebase just after parsing the
* command-line (and are only consumed, not modified, by the sequencer).
*/
static GIT_PATH_FUNC(rebase_path_gpg_sign_opt, "rebase-merge/gpg_sign_opt")
/* We will introduce the 'interactive rebase' mode later */
static inline int is_rebase_i(const struct replay_opts *opts)
{
return 0;
}
static const char *get_dir(const struct replay_opts *opts)
{
return git_path_seq_dir();
}
static const char *get_todo_path(const struct replay_opts *opts)
{
return git_path_todo_file();
}
static int is_rfc2822_line(const char *buf, int len)
{
int i;
for (i = 0; i < len; i++) {
int ch = buf[i];
if (ch == ':')
return 1;
if (!isalnum(ch) && ch != '-')
break;
}
return 0;
}
static int is_cherry_picked_from_line(const char *buf, int len)
{
/*
* We only care that it looks roughly like (cherry picked from ...)
*/
return len > strlen(cherry_picked_prefix) + 1 &&
starts_with(buf, cherry_picked_prefix) && buf[len - 1] == ')';
}
/*
* Returns 0 for non-conforming footer
* Returns 1 for conforming footer
* Returns 2 when sob exists within conforming footer
* Returns 3 when sob exists within conforming footer as last entry
*/
static int has_conforming_footer(struct strbuf *sb, struct strbuf *sob,
int ignore_footer)
{
char prev;
int i, k;
int len = sb->len - ignore_footer;
const char *buf = sb->buf;
int found_sob = 0;
/* footer must end with newline */
if (!len || buf[len - 1] != '\n')
return 0;
prev = '\0';
for (i = len - 1; i > 0; i--) {
char ch = buf[i];
if (prev == '\n' && ch == '\n') /* paragraph break */
break;
prev = ch;
}
/* require at least one blank line */
if (prev != '\n' || buf[i] != '\n')
return 0;
/* advance to start of last paragraph */
while (i < len - 1 && buf[i] == '\n')
i++;
for (; i < len; i = k) {
int found_rfc2822;
for (k = i; k < len && buf[k] != '\n'; k++)
; /* do nothing */
k++;
found_rfc2822 = is_rfc2822_line(buf + i, k - i - 1);
if (found_rfc2822 && sob &&
!strncmp(buf + i, sob->buf, sob->len))
found_sob = k;
if (!(found_rfc2822 ||
is_cherry_picked_from_line(buf + i, k - i - 1)))
return 0;
}
if (found_sob == i)
return 3;
if (found_sob)
return 2;
return 1;
}
static const char *gpg_sign_opt_quoted(struct replay_opts *opts)
{
static struct strbuf buf = STRBUF_INIT;
strbuf_reset(&buf);
if (opts->gpg_sign)
sq_quotef(&buf, "-S%s", opts->gpg_sign);
return buf.buf;
}
int sequencer_remove_state(struct replay_opts *opts)
{
struct strbuf dir = STRBUF_INIT;
int i;
free(opts->gpg_sign);
free(opts->strategy);
for (i = 0; i < opts->xopts_nr; i++)
free(opts->xopts[i]);
free(opts->xopts);
strbuf_addf(&dir, "%s", get_dir(opts));
remove_dir_recursively(&dir, 0);
strbuf_release(&dir);
return 0;
}
static const char *action_name(const struct replay_opts *opts)
{
return opts->action == REPLAY_REVERT ? N_("revert") : N_("cherry-pick");
}
struct commit_message {
char *parent_label;
char *label;
char *subject;
const char *message;
};
static const char *short_commit_name(struct commit *commit)
{
return find_unique_abbrev(commit->object.oid.hash, DEFAULT_ABBREV);
}
static int get_message(struct commit *commit, struct commit_message *out)
{
const char *abbrev, *subject;
int subject_len;
out->message = logmsg_reencode(commit, NULL, get_commit_output_encoding());
abbrev = short_commit_name(commit);
subject_len = find_commit_subject(out->message, &subject);
out->subject = xmemdupz(subject, subject_len);
out->label = xstrfmt("%s... %s", abbrev, out->subject);
out->parent_label = xstrfmt("parent of %s", out->label);
return 0;
}
static void free_message(struct commit *commit, struct commit_message *msg)
{
free(msg->parent_label);
free(msg->label);
free(msg->subject);
unuse_commit_buffer(commit, msg->message);
}
static void print_advice(int show_hint, struct replay_opts *opts)
{
char *msg = getenv("GIT_CHERRY_PICK_HELP");
if (msg) {
fprintf(stderr, "%s\n", msg);
/*
* A conflict has occurred but the porcelain
* (typically rebase --interactive) wants to take care
* of the commit itself so remove CHERRY_PICK_HEAD
*/
unlink(git_path_cherry_pick_head());
return;
}
if (show_hint) {
if (opts->no_commit)
advise(_("after resolving the conflicts, mark the corrected paths\n"
"with 'git add <paths>' or 'git rm <paths>'"));
else
advise(_("after resolving the conflicts, mark the corrected paths\n"
"with 'git add <paths>' or 'git rm <paths>'\n"
"and commit the result with 'git commit'"));
}
}
static int write_message(const void *buf, size_t len, const char *filename,
int append_eol)
{
static struct lock_file msg_file;
int msg_fd = hold_lock_file_for_update(&msg_file, filename, 0);
if (msg_fd < 0)
return error_errno(_("could not lock '%s'"), filename);
if (write_in_full(msg_fd, buf, len) < 0) {
rollback_lock_file(&msg_file);
return error_errno(_("could not write to '%s'"), filename);
}
if (append_eol && write(msg_fd, "\n", 1) < 0) {
rollback_lock_file(&msg_file);
return error_errno(_("could not write eol to '%s'"), filename);
}
if (commit_lock_file(&msg_file) < 0) {
rollback_lock_file(&msg_file);
return error(_("failed to finalize '%s'."), filename);
}
return 0;
}
/*
* Reads a file that was presumably written by a shell script, i.e. with an
* end-of-line marker that needs to be stripped.
*
* Note that only the last end-of-line marker is stripped, consistent with the
* behavior of "$(cat path)" in a shell script.
*
* Returns 1 if the file was read, 0 if it could not be read or does not exist.
*/
static int read_oneliner(struct strbuf *buf,
const char *path, int skip_if_empty)
{
int orig_len = buf->len;
if (!file_exists(path))
return 0;
if (strbuf_read_file(buf, path, 0) < 0) {
warning_errno(_("could not read '%s'"), path);
return 0;
}
if (buf->len > orig_len && buf->buf[buf->len - 1] == '\n') {
if (--buf->len > orig_len && buf->buf[buf->len - 1] == '\r')
--buf->len;
buf->buf[buf->len] = '\0';
}
if (skip_if_empty && buf->len == orig_len)
return 0;
return 1;
}
static struct tree *empty_tree(void)
{
return lookup_tree(EMPTY_TREE_SHA1_BIN);
}
static int error_dirty_index(struct replay_opts *opts)
{
if (read_cache_unmerged())
return error_resolve_conflict(_(action_name(opts)));
error(_("your local changes would be overwritten by %s."),
_(action_name(opts)));
if (advice_commit_before_merge)
advise(_("commit your changes or stash them to proceed."));
return -1;
}
static int fast_forward_to(const unsigned char *to, const unsigned char *from,
int unborn, struct replay_opts *opts)
{
struct ref_transaction *transaction;
struct strbuf sb = STRBUF_INIT;
struct strbuf err = STRBUF_INIT;
read_cache();
if (checkout_fast_forward(from, to, 1))
return -1; /* the callee should have complained already */
strbuf_addf(&sb, _("%s: fast-forward"), _(action_name(opts)));
transaction = ref_transaction_begin(&err);
if (!transaction ||
ref_transaction_update(transaction, "HEAD",
to, unborn ? null_sha1 : from,
0, sb.buf, &err) ||
ref_transaction_commit(transaction, &err)) {
ref_transaction_free(transaction);
error("%s", err.buf);
strbuf_release(&sb);
strbuf_release(&err);
return -1;
}
strbuf_release(&sb);
strbuf_release(&err);
ref_transaction_free(transaction);
return 0;
}
void append_conflicts_hint(struct strbuf *msgbuf)
{
int i;
strbuf_addch(msgbuf, '\n');
strbuf_commented_addf(msgbuf, "Conflicts:\n");
for (i = 0; i < active_nr;) {
const struct cache_entry *ce = active_cache[i++];
if (ce_stage(ce)) {
strbuf_commented_addf(msgbuf, "\t%s\n", ce->name);
while (i < active_nr && !strcmp(ce->name,
active_cache[i]->name))
i++;
}
}
}
static int do_recursive_merge(struct commit *base, struct commit *next,
const char *base_label, const char *next_label,
unsigned char *head, struct strbuf *msgbuf,
struct replay_opts *opts)
{
struct merge_options o;
struct tree *result, *next_tree, *base_tree, *head_tree;
int clean;
char **xopt;
static struct lock_file index_lock;
hold_locked_index(&index_lock, 1);
read_cache();
init_merge_options(&o);
o.ancestor = base ? base_label : "(empty tree)";
o.branch1 = "HEAD";
o.branch2 = next ? next_label : "(empty tree)";
head_tree = parse_tree_indirect(head);
next_tree = next ? next->tree : empty_tree();
base_tree = base ? base->tree : empty_tree();
for (xopt = opts->xopts; xopt != opts->xopts + opts->xopts_nr; xopt++)
parse_merge_opt(&o, *xopt);
clean = merge_trees(&o,
head_tree,
next_tree, base_tree, &result);
strbuf_release(&o.obuf);
if (clean < 0)
return clean;
if (active_cache_changed &&
write_locked_index(&the_index, &index_lock, COMMIT_LOCK))
/* TRANSLATORS: %s will be "revert" or "cherry-pick" */
return error(_("%s: Unable to write new index file"),
_(action_name(opts)));
rollback_lock_file(&index_lock);
if (opts->signoff)
append_signoff(msgbuf, 0, 0);
if (!clean)
append_conflicts_hint(msgbuf);
return !clean;
}
static int is_index_unchanged(void)
{
unsigned char head_sha1[20];
struct commit *head_commit;
if (!resolve_ref_unsafe("HEAD", RESOLVE_REF_READING, head_sha1, NULL))
return error(_("could not resolve HEAD commit\n"));
head_commit = lookup_commit(head_sha1);
/*
* If head_commit is NULL, check_commit, called from
* lookup_commit, would have indicated that head_commit is not
* a commit object already. parse_commit() will return failure
* without further complaints in such a case. Otherwise, if
* the commit is invalid, parse_commit() will complain. So
* there is nothing for us to say here. Just return failure.
*/
if (parse_commit(head_commit))
return -1;
if (!active_cache_tree)
active_cache_tree = cache_tree();
if (!cache_tree_fully_valid(active_cache_tree))
if (cache_tree_update(&the_index, 0))
return error(_("unable to update cache tree\n"));
return !hashcmp(active_cache_tree->sha1, head_commit->tree->object.oid.hash);
}
/*
* Read the author-script file into an environment block, ready for use in
* run_command(), that can be free()d afterwards.
*/
static char **read_author_script(void)
{
struct strbuf script = STRBUF_INIT;
int i, count = 0;
char *p, *p2, **env;
size_t env_size;
if (strbuf_read_file(&script, rebase_path_author_script(), 256) <= 0)
return NULL;
for (p = script.buf; *p; p++)
if (skip_prefix(p, "'\\\\''", (const char **)&p2))
strbuf_splice(&script, p - script.buf, p2 - p, "'", 1);
else if (*p == '\'')
strbuf_splice(&script, p-- - script.buf, 1, "", 0);
else if (*p == '\n') {
*p = '\0';
count++;
}
env_size = (count + 1) * sizeof(*env);
strbuf_grow(&script, env_size);
memmove(script.buf + env_size, script.buf, script.len);
p = script.buf + env_size;
env = (char **)strbuf_detach(&script, NULL);
for (i = 0; i < count; i++) {
env[i] = p;
p += strlen(p) + 1;
}
env[count] = NULL;
return env;
}
static const char staged_changes_advice[] =
N_("you have staged changes in your working tree\n"
"If these changes are meant to be squashed into the previous commit, run:\n"
"\n"
" git commit --amend %s\n"
"\n"
"If they are meant to go into a new commit, run:\n"
"\n"
" git commit %s\n"
"\n"
"In both cases, once you're done, continue with:\n"
"\n"
" git rebase --continue\n");
/*
* If we are cherry-pick, and if the merge did not result in
* hand-editing, we will hit this commit and inherit the original
* author date and name.
*
* If we are revert, or if our cherry-pick results in a hand merge,
* we had better say that the current user is responsible for that.
*
* An exception is when run_git_commit() is called during an
* interactive rebase: in that case, we will want to retain the
* author metadata.
*/
static int run_git_commit(const char *defmsg, struct replay_opts *opts,
int allow_empty, int edit, int amend,
int cleanup_commit_message)
{
char **env = NULL;
struct argv_array array;
int rc;
const char *value;
if (is_rebase_i(opts)) {
env = read_author_script();
if (!env) {
const char *gpg_opt = gpg_sign_opt_quoted(opts);
return error(_(staged_changes_advice),
gpg_opt, gpg_opt);
}
}
argv_array_init(&array);
argv_array_push(&array, "commit");
argv_array_push(&array, "-n");
if (amend)
argv_array_push(&array, "--amend");
if (opts->gpg_sign)
argv_array_pushf(&array, "-S%s", opts->gpg_sign);
if (opts->signoff)
argv_array_push(&array, "-s");
if (defmsg)
argv_array_pushl(&array, "-F", defmsg, NULL);
if (cleanup_commit_message)
argv_array_push(&array, "--cleanup=strip");
if (edit)
argv_array_push(&array, "-e");
else if (!cleanup_commit_message &&
!opts->signoff && !opts->record_origin &&
git_config_get_value("commit.cleanup", &value))
argv_array_push(&array, "--cleanup=verbatim");
if (allow_empty)
argv_array_push(&array, "--allow-empty");
if (opts->allow_empty_message)
argv_array_push(&array, "--allow-empty-message");
rc = run_command_v_opt_cd_env(array.argv, RUN_GIT_CMD, NULL,
(const char *const *)env);
argv_array_clear(&array);
free(env);
return rc;
}
static int is_original_commit_empty(struct commit *commit)
{
const unsigned char *ptree_sha1;
if (parse_commit(commit))
return error(_("could not parse commit %s\n"),
oid_to_hex(&commit->object.oid));
if (commit->parents) {
struct commit *parent = commit->parents->item;
if (parse_commit(parent))
return error(_("could not parse parent commit %s\n"),
oid_to_hex(&parent->object.oid));
ptree_sha1 = parent->tree->object.oid.hash;
} else {
ptree_sha1 = EMPTY_TREE_SHA1_BIN; /* commit is root */
}
return !hashcmp(ptree_sha1, commit->tree->object.oid.hash);
}
/*
* Do we run "git commit" with "--allow-empty"?
*/
static int allow_empty(struct replay_opts *opts, struct commit *commit)
{
int index_unchanged, empty_commit;
/*
* Three cases:
*
* (1) we do not allow empty at all and error out.
*
* (2) we allow ones that were initially empty, but
* forbid the ones that become empty;
*
* (3) we allow both.
*/
if (!opts->allow_empty)
return 0; /* let "git commit" barf as necessary */
index_unchanged = is_index_unchanged();
if (index_unchanged < 0)
return index_unchanged;
if (!index_unchanged)
return 0; /* we do not have to say --allow-empty */
if (opts->keep_redundant_commits)
return 1;
empty_commit = is_original_commit_empty(commit);
if (empty_commit < 0)
return empty_commit;
if (!empty_commit)
return 0;
else
return 1;
}
enum todo_command {
TODO_PICK = 0,
TODO_REVERT
};
static const char *todo_command_strings[] = {
"pick",
"revert"
};
static const char *command_to_string(const enum todo_command command)
{
if ((size_t)command < ARRAY_SIZE(todo_command_strings))
return todo_command_strings[command];
die("Unknown command: %d", command);
}
static int do_pick_commit(enum todo_command command, struct commit *commit,
struct replay_opts *opts)
{
unsigned char head[20];
struct commit *base, *next, *parent;
const char *base_label, *next_label;
struct commit_message msg = { NULL, NULL, NULL, NULL };
struct strbuf msgbuf = STRBUF_INIT;
int res, unborn = 0, allow;
if (opts->no_commit) {
/*
* We do not intend to commit immediately. We just want to
* merge the differences in, so let's compute the tree
* that represents the "current" state for merge-recursive
* to work on.
*/
if (write_cache_as_tree(head, 0, NULL))
return error(_("your index file is unmerged."));
} else {
unborn = get_sha1("HEAD", head);
if (unborn)
hashcpy(head, EMPTY_TREE_SHA1_BIN);
if (index_differs_from(unborn ? EMPTY_TREE_SHA1_HEX : "HEAD", 0, 0))
return error_dirty_index(opts);
}
discard_cache();
if (!commit->parents) {
parent = NULL;
}
else if (commit->parents->next) {
/* Reverting or cherry-picking a merge commit */
int cnt;
struct commit_list *p;
if (!opts->mainline)
return error(_("commit %s is a merge but no -m option was given."),
oid_to_hex(&commit->object.oid));
for (cnt = 1, p = commit->parents;
cnt != opts->mainline && p;
cnt++)
p = p->next;
if (cnt != opts->mainline || !p)
return error(_("commit %s does not have parent %d"),
oid_to_hex(&commit->object.oid), opts->mainline);
parent = p->item;
} else if (0 < opts->mainline)
return error(_("mainline was specified but commit %s is not a merge."),
oid_to_hex(&commit->object.oid));
else
parent = commit->parents->item;
if (opts->allow_ff &&
((parent && !hashcmp(parent->object.oid.hash, head)) ||
(!parent && unborn)))
return fast_forward_to(commit->object.oid.hash, head, unborn, opts);
if (parent && parse_commit(parent) < 0)
/* TRANSLATORS: The first %s will be a "todo" command like
"revert" or "pick", the second %s a SHA1. */
return error(_("%s: cannot parse parent commit %s"),
command_to_string(command),
oid_to_hex(&parent->object.oid));
if (get_message(commit, &msg) != 0)
return error(_("cannot get commit message for %s"),
oid_to_hex(&commit->object.oid));
/*
* "commit" is an existing commit. We would want to apply
* the difference it introduces since its first parent "prev"
* on top of the current HEAD if we are cherry-pick. Or the
* reverse of it if we are revert.
*/
if (command == TODO_REVERT) {
base = commit;
base_label = msg.label;
next = parent;
next_label = msg.parent_label;
strbuf_addstr(&msgbuf, "Revert \"");
strbuf_addstr(&msgbuf, msg.subject);
strbuf_addstr(&msgbuf, "\"\n\nThis reverts commit ");
strbuf_addstr(&msgbuf, oid_to_hex(&commit->object.oid));
if (commit->parents && commit->parents->next) {
strbuf_addstr(&msgbuf, ", reversing\nchanges made to ");
strbuf_addstr(&msgbuf, oid_to_hex(&parent->object.oid));
}
strbuf_addstr(&msgbuf, ".\n");
} else {
const char *p;
base = parent;
base_label = msg.parent_label;
next = commit;
next_label = msg.label;
/*
* Append the commit log message to msgbuf; it starts
* after the tree, parent, author, committer
* information followed by "\n\n".
*/
p = strstr(msg.message, "\n\n");
if (p)
strbuf_addstr(&msgbuf, skip_blank_lines(p + 2));
if (opts->record_origin) {
if (!has_conforming_footer(&msgbuf, NULL, 0))
strbuf_addch(&msgbuf, '\n');
strbuf_addstr(&msgbuf, cherry_picked_prefix);
strbuf_addstr(&msgbuf, oid_to_hex(&commit->object.oid));
strbuf_addstr(&msgbuf, ")\n");
}
}
if (!opts->strategy || !strcmp(opts->strategy, "recursive") || command == TODO_REVERT) {
res = do_recursive_merge(base, next, base_label, next_label,
head, &msgbuf, opts);
if (res < 0)
return res;
res |= write_message(msgbuf.buf, msgbuf.len,
git_path_merge_msg(), 0);
} else {
struct commit_list *common = NULL;
struct commit_list *remotes = NULL;
res = write_message(msgbuf.buf, msgbuf.len,
git_path_merge_msg(), 0);
commit_list_insert(base, &common);
commit_list_insert(next, &remotes);
res |= try_merge_command(opts->strategy,
opts->xopts_nr, (const char **)opts->xopts,
common, sha1_to_hex(head), remotes);
free_commit_list(common);
free_commit_list(remotes);
}
strbuf_release(&msgbuf);
/*
* If the merge was clean or if it failed due to conflict, we write
* CHERRY_PICK_HEAD for the subsequent invocation of commit to use.
* However, if the merge did not even start, then we don't want to
* write it at all.
*/
if (command == TODO_PICK && !opts->no_commit && (res == 0 || res == 1) &&
update_ref(NULL, "CHERRY_PICK_HEAD", commit->object.oid.hash, NULL,
REF_NODEREF, UPDATE_REFS_MSG_ON_ERR))
res = -1;
if (command == TODO_REVERT && ((opts->no_commit && res == 0) || res == 1) &&
update_ref(NULL, "REVERT_HEAD", commit->object.oid.hash, NULL,
REF_NODEREF, UPDATE_REFS_MSG_ON_ERR))
res = -1;
if (res) {
error(command == TODO_REVERT
? _("could not revert %s... %s")
: _("could not apply %s... %s"),
short_commit_name(commit), msg.subject);
print_advice(res == 1, opts);
rerere(opts->allow_rerere_auto);
goto leave;
}
allow = allow_empty(opts, commit);
if (allow < 0) {
res = allow;
goto leave;
}
if (!opts->no_commit)
res = run_git_commit(opts->edit ? NULL : git_path_merge_msg(),
opts, allow, opts->edit, 0, 0);
leave:
free_message(commit, &msg);
return res;
}
static int prepare_revs(struct replay_opts *opts)
{
/*
* picking (but not reverting) ranges (but not individual revisions)
* should be done in reverse
*/
if (opts->action == REPLAY_PICK && !opts->revs->no_walk)
opts->revs->reverse ^= 1;
if (prepare_revision_walk(opts->revs))
return error(_("revision walk setup failed"));
if (!opts->revs->commits)
return error(_("empty commit set passed"));
return 0;
}
static int read_and_refresh_cache(struct replay_opts *opts)
{
static struct lock_file index_lock;
int index_fd = hold_locked_index(&index_lock, 0);
if (read_index_preload(&the_index, NULL) < 0) {
rollback_lock_file(&index_lock);
return error(_("git %s: failed to read the index"),
_(action_name(opts)));
}
refresh_index(&the_index, REFRESH_QUIET|REFRESH_UNMERGED, NULL, NULL, NULL);
if (the_index.cache_changed && index_fd >= 0) {
if (write_locked_index(&the_index, &index_lock, COMMIT_LOCK)) {
rollback_lock_file(&index_lock);
return error(_("git %s: failed to refresh the index"),
_(action_name(opts)));
}
}
rollback_lock_file(&index_lock);
return 0;
}
struct todo_item {
enum todo_command command;
struct commit *commit;
const char *arg;
int arg_len;
size_t offset_in_buf;
};
struct todo_list {
struct strbuf buf;
struct todo_item *items;
int nr, alloc, current;
};
#define TODO_LIST_INIT { STRBUF_INIT }
static void todo_list_release(struct todo_list *todo_list)
{
strbuf_release(&todo_list->buf);
free(todo_list->items);
todo_list->items = NULL;
todo_list->nr = todo_list->alloc = 0;
}
static struct todo_item *append_new_todo(struct todo_list *todo_list)
{
ALLOC_GROW(todo_list->items, todo_list->nr + 1, todo_list->alloc);
return todo_list->items + todo_list->nr++;
}
static int parse_insn_line(struct todo_item *item, const char *bol, char *eol)
{
unsigned char commit_sha1[20];
char *end_of_object_name;
int i, saved, status, padding;
/* left-trim */
bol += strspn(bol, " \t");
for (i = 0; i < ARRAY_SIZE(todo_command_strings); i++)
if (skip_prefix(bol, todo_command_strings[i], &bol)) {
item->command = i;
break;
}
if (i >= ARRAY_SIZE(todo_command_strings))
return -1;
/* Eat up extra spaces/ tabs before object name */
padding = strspn(bol, " \t");
if (!padding)
return -1;
bol += padding;
end_of_object_name = (char *) bol + strcspn(bol, " \t\n");
saved = *end_of_object_name;
*end_of_object_name = '\0';
status = get_sha1(bol, commit_sha1);
*end_of_object_name = saved;
item->arg = end_of_object_name + strspn(end_of_object_name, " \t");
item->arg_len = (int)(eol - item->arg);
if (status < 0)
return -1;
item->commit = lookup_commit_reference(commit_sha1);
return !item->commit;
}
static int parse_insn_buffer(char *buf, struct todo_list *todo_list)
{
struct todo_item *item;
char *p = buf, *next_p;
int i, res = 0;
for (i = 1; *p; i++, p = next_p) {
char *eol = strchrnul(p, '\n');
next_p = *eol ? eol + 1 /* skip LF */ : eol;
if (p != eol && eol[-1] == '\r')
eol--; /* strip Carriage Return */
item = append_new_todo(todo_list);
item->offset_in_buf = p - todo_list->buf.buf;
if (parse_insn_line(item, p, eol)) {
res = error(_("invalid line %d: %.*s"),
i, (int)(eol - p), p);
item->command = -1;
}
}
if (!todo_list->nr)
return error(_("no commits parsed."));
return res;
}
static int read_populate_todo(struct todo_list *todo_list,
struct replay_opts *opts)
{
const char *todo_file = get_todo_path(opts);
int fd, res;
strbuf_reset(&todo_list->buf);
fd = open(todo_file, O_RDONLY);
if (fd < 0)
return error_errno(_("could not open '%s'"), todo_file);
if (strbuf_read(&todo_list->buf, fd, 0) < 0) {
close(fd);
return error(_("could not read '%s'."), todo_file);
}
close(fd);
res = parse_insn_buffer(todo_list->buf.buf, todo_list);
if (res)
return error(_("unusable instruction sheet: '%s'"), todo_file);
if (!is_rebase_i(opts)) {
enum todo_command valid =
opts->action == REPLAY_PICK ? TODO_PICK : TODO_REVERT;
int i;
for (i = 0; i < todo_list->nr; i++)
if (valid == todo_list->items[i].command)
continue;
else if (valid == TODO_PICK)
return error(_("cannot cherry-pick during a revert."));
else
return error(_("cannot revert during a cherry-pick."));
}
return 0;
}
static int git_config_string_dup(char **dest,
const char *var, const char *value)
{
if (!value)
return config_error_nonbool(var);
free(*dest);
*dest = xstrdup(value);
return 0;
}
static int populate_opts_cb(const char *key, const char *value, void *data)
{
struct replay_opts *opts = data;
int error_flag = 1;
if (!value)
error_flag = 0;
else if (!strcmp(key, "options.no-commit"))
opts->no_commit = git_config_bool_or_int(key, value, &error_flag);
else if (!strcmp(key, "options.edit"))
opts->edit = git_config_bool_or_int(key, value, &error_flag);
else if (!strcmp(key, "options.signoff"))
opts->signoff = git_config_bool_or_int(key, value, &error_flag);
else if (!strcmp(key, "options.record-origin"))
opts->record_origin = git_config_bool_or_int(key, value, &error_flag);
else if (!strcmp(key, "options.allow-ff"))
opts->allow_ff = git_config_bool_or_int(key, value, &error_flag);
else if (!strcmp(key, "options.mainline"))
opts->mainline = git_config_int(key, value);
else if (!strcmp(key, "options.strategy"))
git_config_string_dup(&opts->strategy, key, value);
else if (!strcmp(key, "options.gpg-sign"))
git_config_string_dup(&opts->gpg_sign, key, value);
else if (!strcmp(key, "options.strategy-option")) {
ALLOC_GROW(opts->xopts, opts->xopts_nr + 1, opts->xopts_alloc);
opts->xopts[opts->xopts_nr++] = xstrdup(value);
} else
return error(_("invalid key: %s"), key);
if (!error_flag)
return error(_("invalid value for %s: %s"), key, value);
return 0;
}
static int read_populate_opts(struct replay_opts *opts)
{
if (is_rebase_i(opts)) {
struct strbuf buf = STRBUF_INIT;
if (read_oneliner(&buf, rebase_path_gpg_sign_opt(), 1)) {
if (!starts_with(buf.buf, "-S"))
strbuf_reset(&buf);
else {
free(opts->gpg_sign);
opts->gpg_sign = xstrdup(buf.buf + 2);
}
}
strbuf_release(&buf);
return 0;
}
if (!file_exists(git_path_opts_file()))
return 0;
/*
* The function git_parse_source(), called from git_config_from_file(),
* may die() in case of a syntactically incorrect file. We do not care
* about this case, though, because we wrote that file ourselves, so we
* are pretty certain that it is syntactically correct.
*/
if (git_config_from_file(populate_opts_cb, git_path_opts_file(), opts) < 0)
return error(_("malformed options sheet: '%s'"),
git_path_opts_file());
return 0;
}
static int walk_revs_populate_todo(struct todo_list *todo_list,
struct replay_opts *opts)
{
enum todo_command command = opts->action == REPLAY_PICK ?
TODO_PICK : TODO_REVERT;
const char *command_string = todo_command_strings[command];
struct commit *commit;
if (prepare_revs(opts))
return -1;
while ((commit = get_revision(opts->revs))) {
struct todo_item *item = append_new_todo(todo_list);
const char *commit_buffer = get_commit_buffer(commit, NULL);
const char *subject;
int subject_len;
item->command = command;
item->commit = commit;
item->arg = NULL;
item->arg_len = 0;
item->offset_in_buf = todo_list->buf.len;
subject_len = find_commit_subject(commit_buffer, &subject);
strbuf_addf(&todo_list->buf, "%s %s %.*s\n", command_string,
short_commit_name(commit), subject_len, subject);
unuse_commit_buffer(commit, commit_buffer);
}
return 0;
}
static int create_seq_dir(void)
{
if (file_exists(git_path_seq_dir())) {
error(_("a cherry-pick or revert is already in progress"));
advise(_("try \"git cherry-pick (--continue | --quit | --abort)\""));
return -1;
}
else if (mkdir(git_path_seq_dir(), 0777) < 0)
return error_errno(_("could not create sequencer directory '%s'"),
git_path_seq_dir());
return 0;
}
static int save_head(const char *head)
{
static struct lock_file head_lock;
struct strbuf buf = STRBUF_INIT;
int fd;
fd = hold_lock_file_for_update(&head_lock, git_path_head_file(), 0);
if (fd < 0) {
rollback_lock_file(&head_lock);
return error_errno(_("could not lock HEAD"));
}
strbuf_addf(&buf, "%s\n", head);
if (write_in_full(fd, buf.buf, buf.len) < 0) {
rollback_lock_file(&head_lock);
return error_errno(_("could not write to '%s'"),
git_path_head_file());
}
if (commit_lock_file(&head_lock) < 0) {
rollback_lock_file(&head_lock);
return error(_("failed to finalize '%s'."), git_path_head_file());
}
return 0;
}
static int reset_for_rollback(const unsigned char *sha1)
{
const char *argv[4]; /* reset --merge <arg> + NULL */
argv[0] = "reset";
argv[1] = "--merge";
argv[2] = sha1_to_hex(sha1);
argv[3] = NULL;
return run_command_v_opt(argv, RUN_GIT_CMD);
}
static int rollback_single_pick(void)
{
unsigned char head_sha1[20];
if (!file_exists(git_path_cherry_pick_head()) &&
!file_exists(git_path_revert_head()))
return error(_("no cherry-pick or revert in progress"));
if (read_ref_full("HEAD", 0, head_sha1, NULL))
return error(_("cannot resolve HEAD"));
if (is_null_sha1(head_sha1))
return error(_("cannot abort from a branch yet to be born"));
return reset_for_rollback(head_sha1);
}
int sequencer_rollback(struct replay_opts *opts)
{
FILE *f;
unsigned char sha1[20];
struct strbuf buf = STRBUF_INIT;
f = fopen(git_path_head_file(), "r");
if (!f && errno == ENOENT) {
/*
* There is no multiple-cherry-pick in progress.
* If CHERRY_PICK_HEAD or REVERT_HEAD indicates
* a single-cherry-pick in progress, abort that.
*/
return rollback_single_pick();
}
if (!f)
return error_errno(_("cannot open '%s'"), git_path_head_file());
if (strbuf_getline_lf(&buf, f)) {
error(_("cannot read '%s': %s"), git_path_head_file(),
ferror(f) ? strerror(errno) : _("unexpected end of file"));
fclose(f);
goto fail;
}
fclose(f);
if (get_sha1_hex(buf.buf, sha1) || buf.buf[40] != '\0') {
error(_("stored pre-cherry-pick HEAD file '%s' is corrupt"),
git_path_head_file());
goto fail;
}
if (is_null_sha1(sha1)) {
error(_("cannot abort from a branch yet to be born"));
goto fail;
}
if (reset_for_rollback(sha1))
goto fail;
strbuf_release(&buf);
return sequencer_remove_state(opts);
fail:
strbuf_release(&buf);
return -1;
}
static int save_todo(struct todo_list *todo_list, struct replay_opts *opts)
{
static struct lock_file todo_lock;
const char *todo_path = get_todo_path(opts);
int next = todo_list->current, offset, fd;
fd = hold_lock_file_for_update(&todo_lock, todo_path, 0);
if (fd < 0)
return error_errno(_("could not lock '%s'"), todo_path);
offset = next < todo_list->nr ?
todo_list->items[next].offset_in_buf : todo_list->buf.len;
if (write_in_full(fd, todo_list->buf.buf + offset,
todo_list->buf.len - offset) < 0)
return error_errno(_("could not write to '%s'"), todo_path);
if (commit_lock_file(&todo_lock) < 0)
return error(_("failed to finalize '%s'."), todo_path);
return 0;
}
static int save_opts(struct replay_opts *opts)
{
const char *opts_file = git_path_opts_file();
int res = 0;
if (opts->no_commit)
res |= git_config_set_in_file_gently(opts_file, "options.no-commit", "true");
if (opts->edit)
res |= git_config_set_in_file_gently(opts_file, "options.edit", "true");
if (opts->signoff)
res |= git_config_set_in_file_gently(opts_file, "options.signoff", "true");
if (opts->record_origin)
res |= git_config_set_in_file_gently(opts_file, "options.record-origin", "true");
if (opts->allow_ff)
res |= git_config_set_in_file_gently(opts_file, "options.allow-ff", "true");
if (opts->mainline) {
struct strbuf buf = STRBUF_INIT;
strbuf_addf(&buf, "%d", opts->mainline);
res |= git_config_set_in_file_gently(opts_file, "options.mainline", buf.buf);
strbuf_release(&buf);
}
if (opts->strategy)
res |= git_config_set_in_file_gently(opts_file, "options.strategy", opts->strategy);
if (opts->gpg_sign)
res |= git_config_set_in_file_gently(opts_file, "options.gpg-sign", opts->gpg_sign);
if (opts->xopts) {
int i;
for (i = 0; i < opts->xopts_nr; i++)
res |= git_config_set_multivar_in_file_gently(opts_file,
"options.strategy-option",
opts->xopts[i], "^$", 0);
}
return res;
}
static int pick_commits(struct todo_list *todo_list, struct replay_opts *opts)
{
int res;
setenv(GIT_REFLOG_ACTION, action_name(opts), 0);
if (opts->allow_ff)
assert(!(opts->signoff || opts->no_commit ||
opts->record_origin || opts->edit));
if (read_and_refresh_cache(opts))
return -1;
while (todo_list->current < todo_list->nr) {
struct todo_item *item = todo_list->items + todo_list->current;
if (save_todo(todo_list, opts))
return -1;
res = do_pick_commit(item->command, item->commit, opts);
todo_list->current++;
if (res)
return res;
}
/*
* Sequence of picks finished successfully; cleanup by
* removing the .git/sequencer directory
*/
return sequencer_remove_state(opts);
}
static int continue_single_pick(void)
{
const char *argv[] = { "commit", NULL };
if (!file_exists(git_path_cherry_pick_head()) &&
!file_exists(git_path_revert_head()))
return error(_("no cherry-pick or revert in progress"));
return run_command_v_opt(argv, RUN_GIT_CMD);
}
int sequencer_continue(struct replay_opts *opts)
{
struct todo_list todo_list = TODO_LIST_INIT;
int res;
if (read_and_refresh_cache(opts))
return -1;
if (!file_exists(get_todo_path(opts)))
return continue_single_pick();
if (read_populate_opts(opts))
return -1;
if ((res = read_populate_todo(&todo_list, opts)))
goto release_todo_list;
/* Verify that the conflict has been resolved */
if (file_exists(git_path_cherry_pick_head()) ||
file_exists(git_path_revert_head())) {
res = continue_single_pick();
if (res)
goto release_todo_list;
}
if (index_differs_from("HEAD", 0, 0)) {
res = error_dirty_index(opts);
goto release_todo_list;
}
todo_list.current++;
res = pick_commits(&todo_list, opts);
release_todo_list:
todo_list_release(&todo_list);
return res;
}
static int single_pick(struct commit *cmit, struct replay_opts *opts)
{
setenv(GIT_REFLOG_ACTION, action_name(opts), 0);
return do_pick_commit(opts->action == REPLAY_PICK ?
TODO_PICK : TODO_REVERT, cmit, opts);
}
int sequencer_pick_revisions(struct replay_opts *opts)
{
struct todo_list todo_list = TODO_LIST_INIT;
unsigned char sha1[20];
int i, res;
assert(opts->revs);
if (read_and_refresh_cache(opts))
return -1;
for (i = 0; i < opts->revs->pending.nr; i++) {
unsigned char sha1[20];
const char *name = opts->revs->pending.objects[i].name;
/* This happens when using --stdin. */
if (!strlen(name))
continue;
if (!get_sha1(name, sha1)) {
if (!lookup_commit_reference_gently(sha1, 1)) {
enum object_type type = sha1_object_info(sha1, NULL);
return error(_("%s: can't cherry-pick a %s"),
name, typename(type));
}
} else
return error(_("%s: bad revision"), name);
}
/*
* If we were called as "git cherry-pick <commit>", just
* cherry-pick/revert it, set CHERRY_PICK_HEAD /
* REVERT_HEAD, and don't touch the sequencer state.
* This means it is possible to cherry-pick in the middle
* of a cherry-pick sequence.
*/
if (opts->revs->cmdline.nr == 1 &&
opts->revs->cmdline.rev->whence == REV_CMD_REV &&
opts->revs->no_walk &&
!opts->revs->cmdline.rev->flags) {
struct commit *cmit;
if (prepare_revision_walk(opts->revs))
return error(_("revision walk setup failed"));
cmit = get_revision(opts->revs);
if (!cmit || get_revision(opts->revs))
return error("BUG: expected exactly one commit from walk");
return single_pick(cmit, opts);
}
/*
* Start a new cherry-pick/ revert sequence; but
* first, make sure that an existing one isn't in
* progress
*/
if (walk_revs_populate_todo(&todo_list, opts) ||
create_seq_dir() < 0)
return -1;
if (get_sha1("HEAD", sha1) && (opts->action == REPLAY_REVERT))
return error(_("can't revert as initial commit"));
if (save_head(sha1_to_hex(sha1)))
return -1;
if (save_opts(opts))
return -1;
res = pick_commits(&todo_list, opts);
todo_list_release(&todo_list);
return res;
}
void append_signoff(struct strbuf *msgbuf, int ignore_footer, unsigned flag)
{
unsigned no_dup_sob = flag & APPEND_SIGNOFF_DEDUP;
struct strbuf sob = STRBUF_INIT;
int has_footer;
strbuf_addstr(&sob, sign_off_header);
strbuf_addstr(&sob, fmt_name(getenv("GIT_COMMITTER_NAME"),
getenv("GIT_COMMITTER_EMAIL")));
strbuf_addch(&sob, '\n');
/*
* If the whole message buffer is equal to the sob, pretend that we
* found a conforming footer with a matching sob
*/
if (msgbuf->len - ignore_footer == sob.len &&
!strncmp(msgbuf->buf, sob.buf, sob.len))
has_footer = 3;
else
has_footer = has_conforming_footer(msgbuf, &sob, ignore_footer);
if (!has_footer) {
const char *append_newlines = NULL;
size_t len = msgbuf->len - ignore_footer;
if (!len) {
/*
* The buffer is completely empty. Leave foom for
* the title and body to be filled in by the user.
*/
append_newlines = "\n\n";
} else if (msgbuf->buf[len - 1] != '\n') {
/*
* Incomplete line. Complete the line and add a
* blank one so that there is an empty line between
* the message body and the sob.
*/
append_newlines = "\n\n";
} else if (len == 1) {
/*
* Buffer contains a single newline. Add another
* so that we leave room for the title and body.
*/
append_newlines = "\n";
} else if (msgbuf->buf[len - 2] != '\n') {
/*
* Buffer ends with a single newline. Add another
* so that there is an empty line between the message
* body and the sob.
*/
append_newlines = "\n";
} /* else, the buffer already ends with two newlines. */
if (append_newlines)
strbuf_splice(msgbuf, msgbuf->len - ignore_footer, 0,
append_newlines, strlen(append_newlines));
}
if (has_footer != 3 && (!no_dup_sob || has_footer != 2))
strbuf_splice(msgbuf, msgbuf->len - ignore_footer, 0,
sob.buf, sob.len);
strbuf_release(&sob);
}