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#include "cache.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"

#define GIT_REFLOG_ACTION "GIT_REFLOG_ACTION"

const char sign_off_header[] = "Signed-off-by: ";

static void remove_sequencer_state(void)
{
struct strbuf seq_dir = STRBUF_INIT;

strbuf_addf(&seq_dir, "%s", git_path(SEQ_DIR));
remove_dir_recursively(&seq_dir, 0);
strbuf_release(&seq_dir);
}

static const char *action_name(const struct replay_opts *opts)
{
return opts->action == REPLAY_REVERT ? "revert" : "cherry-pick";
}

static char *get_encoding(const char *message);

struct commit_message {
char *parent_label;
const char *label;
const char *subject;
char *reencoded_message;
const char *message;
};

static int get_message(struct commit *commit, struct commit_message *out)
{
const char *encoding;
const char *abbrev, *subject;
int abbrev_len, subject_len;
char *q;

if (!commit->buffer)
return -1;
encoding = get_encoding(commit->buffer);
if (!encoding)
encoding = "UTF-8";
if (!git_commit_encoding)
git_commit_encoding = "UTF-8";

out->reencoded_message = NULL;
out->message = commit->buffer;
if (same_encoding(encoding, git_commit_encoding))
out->reencoded_message = reencode_string(commit->buffer,
git_commit_encoding, encoding);
if (out->reencoded_message)
out->message = out->reencoded_message;

abbrev = find_unique_abbrev(commit->object.sha1, DEFAULT_ABBREV);
abbrev_len = strlen(abbrev);

subject_len = find_commit_subject(out->message, &subject);

out->parent_label = xmalloc(strlen("parent of ") + abbrev_len +
strlen("... ") + subject_len + 1);
q = out->parent_label;
q = mempcpy(q, "parent of ", strlen("parent of "));
out->label = q;
q = mempcpy(q, abbrev, abbrev_len);
q = mempcpy(q, "... ", strlen("... "));
out->subject = q;
q = mempcpy(q, subject, subject_len);
*q = '\0';
return 0;
}

static void free_message(struct commit_message *msg)
{
free(msg->parent_label);
free(msg->reencoded_message);
}

static char *get_encoding(const char *message)
{
const char *p = message, *eol;

while (*p && *p != '\n') {
for (eol = p + 1; *eol && *eol != '\n'; eol++)
; /* do nothing */
if (!prefixcmp(p, "encoding ")) {
char *result = xmalloc(eol - 8 - p);
strlcpy(result, p + 9, eol - 8 - p);
return result;
}
p = eol;
if (*p == '\n')
p++;
}
return NULL;
}

static void write_cherry_pick_head(struct commit *commit, const char *pseudoref)
{
const char *filename;
int fd;
struct strbuf buf = STRBUF_INIT;

strbuf_addf(&buf, "%s\n", sha1_to_hex(commit->object.sha1));

filename = git_path("%s", pseudoref);
fd = open(filename, O_WRONLY | O_CREAT, 0666);
if (fd < 0)
die_errno(_("Could not open '%s' for writing"), filename);
if (write_in_full(fd, buf.buf, buf.len) != buf.len || close(fd))
die_errno(_("Could not write to '%s'"), filename);
strbuf_release(&buf);
}

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 occured 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 void write_message(struct strbuf *msgbuf, const char *filename)
{
static struct lock_file msg_file;

int msg_fd = hold_lock_file_for_update(&msg_file, filename,
LOCK_DIE_ON_ERROR);
if (write_in_full(msg_fd, msgbuf->buf, msgbuf->len) < 0)
die_errno(_("Could not write to %s"), filename);
strbuf_release(msgbuf);
if (commit_lock_file(&msg_file) < 0)
die(_("Error wrapping up %s"), filename);
}

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));

/* Different translation strings for cherry-pick and revert */
if (opts->action == REPLAY_PICK)
error(_("Your local changes would be overwritten by cherry-pick."));
else
error(_("Your local changes would be overwritten by revert."));

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 ref_lock *ref_lock;

read_cache();
if (checkout_fast_forward(from, to, 1))
exit(1); /* the callee should have complained already */
ref_lock = lock_any_ref_for_update("HEAD", unborn ? null_sha1 : from, 0);
return write_ref_sha1(ref_lock, to, "cherry-pick");
}

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, index_fd;
const char **xopt;
static struct lock_file index_lock;

index_fd = 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);

if (active_cache_changed &&
(write_cache(index_fd, active_cache, active_nr) ||
commit_locked_index(&index_lock)))
/* TRANSLATORS: %s will be "revert" or "cherry-pick" */
die(_("%s: Unable to write new index file"), action_name(opts));
rollback_lock_file(&index_lock);

if (opts->signoff)
append_signoff(msgbuf, 0);

if (!clean) {
int i;
strbuf_addstr(msgbuf, "\nConflicts:\n");
for (i = 0; i < active_nr;) {
struct cache_entry *ce = active_cache[i++];
if (ce_stage(ce)) {
strbuf_addch(msgbuf, '\t');
strbuf_addstr(msgbuf, ce->name);
strbuf_addch(msgbuf, '\n');
while (i < active_nr && !strcmp(ce->name,
active_cache[i]->name))
i++;
}
}
}

return !clean;
}

static int is_index_unchanged(void)
{
unsigned char head_sha1[20];
struct commit *head_commit;

if (!resolve_ref_unsafe("HEAD", head_sha1, 1, 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(active_cache_tree, active_cache,
active_nr, 0))
return error(_("Unable to update cache tree\n"));

return !hashcmp(active_cache_tree->sha1, head_commit->tree->object.sha1);
}

/*
* 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.
*/
static int run_git_commit(const char *defmsg, struct replay_opts *opts,
int allow_empty)
{
struct argv_array array;
int rc;

argv_array_init(&array);
argv_array_push(&array, "commit");
argv_array_push(&array, "-n");

if (opts->signoff)
argv_array_push(&array, "-s");
if (!opts->edit) {
argv_array_push(&array, "-F");
argv_array_push(&array, defmsg);
}

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(array.argv, RUN_GIT_CMD);
argv_array_clear(&array);
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"),
sha1_to_hex(commit->object.sha1));
if (commit->parents) {
struct commit *parent = commit->parents->item;
if (parse_commit(parent))
return error(_("Could not parse parent commit %s\n"),
sha1_to_hex(parent->object.sha1));
ptree_sha1 = parent->tree->object.sha1;
} else {
ptree_sha1 = EMPTY_TREE_SHA1_BIN; /* commit is root */
}

return !hashcmp(ptree_sha1, commit->tree->object.sha1);
}

/*
* 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;
}

static int do_pick_commit(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, NULL };
char *defmsg = NULL;
struct strbuf msgbuf = STRBUF_INIT;
int res, unborn = 0;

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))
die (_("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))
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."),
sha1_to_hex(commit->object.sha1));

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"),
sha1_to_hex(commit->object.sha1), opts->mainline);
parent = p->item;
} else if (0 < opts->mainline)
return error(_("Mainline was specified but commit %s is not a merge."),
sha1_to_hex(commit->object.sha1));
else
parent = commit->parents->item;

if (opts->allow_ff &&
((parent && !hashcmp(parent->object.sha1, head)) ||
(!parent && unborn)))
return fast_forward_to(commit->object.sha1, head, unborn);

if (parent && parse_commit(parent) < 0)
/* TRANSLATORS: The first %s will be "revert" or
"cherry-pick", the second %s a SHA1 */
return error(_("%s: cannot parse parent commit %s"),
action_name(opts), sha1_to_hex(parent->object.sha1));

if (get_message(commit, &msg) != 0)
return error(_("Cannot get commit message for %s"),
sha1_to_hex(commit->object.sha1));

/*
* "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.
*/

defmsg = git_pathdup("MERGE_MSG");

if (opts->action == REPLAY_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, sha1_to_hex(commit->object.sha1));

if (commit->parents && commit->parents->next) {
strbuf_addstr(&msgbuf, ", reversing\nchanges made to ");
strbuf_addstr(&msgbuf, sha1_to_hex(parent->object.sha1));
}
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) {
p += 2;
strbuf_addstr(&msgbuf, p);
}

if (opts->record_origin) {
strbuf_addstr(&msgbuf, "(cherry picked from commit ");
strbuf_addstr(&msgbuf, sha1_to_hex(commit->object.sha1));
strbuf_addstr(&msgbuf, ")\n");
}
}

if (!opts->strategy || !strcmp(opts->strategy, "recursive") || opts->action == REPLAY_REVERT) {
res = do_recursive_merge(base, next, base_label, next_label,
head, &msgbuf, opts);
write_message(&msgbuf, defmsg);
} else {
struct commit_list *common = NULL;
struct commit_list *remotes = NULL;

write_message(&msgbuf, defmsg);

commit_list_insert(base, &common);
commit_list_insert(next, &remotes);
res = try_merge_command(opts->strategy, opts->xopts_nr, opts->xopts,
common, sha1_to_hex(head), remotes);
free_commit_list(common);
free_commit_list(remotes);
}

/*
* 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 (opts->action == REPLAY_PICK && !opts->no_commit && (res == 0 || res == 1))
write_cherry_pick_head(commit, "CHERRY_PICK_HEAD");
if (opts->action == REPLAY_REVERT && ((opts->no_commit && res == 0) || res == 1))
write_cherry_pick_head(commit, "REVERT_HEAD");

if (res) {
error(opts->action == REPLAY_REVERT
? _("could not revert %s... %s")
: _("could not apply %s... %s"),
find_unique_abbrev(commit->object.sha1, DEFAULT_ABBREV),
msg.subject);
print_advice(res == 1, opts);
rerere(opts->allow_rerere_auto);
} else {
int allow = allow_empty(opts, commit);
if (allow < 0)
return allow;
if (!opts->no_commit)
res = run_git_commit(defmsg, opts, allow);
}

free_message(&msg);
free(defmsg);

return res;
}

static void 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))
die(_("revision walk setup failed"));

if (!opts->revs->commits)
die(_("empty commit set passed"));
}

static void 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)
die(_("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) {
if (write_index(&the_index, index_fd) ||
commit_locked_index(&index_lock))
die(_("git %s: failed to refresh the index"), action_name(opts));
}
rollback_lock_file(&index_lock);
}

static int format_todo(struct strbuf *buf, struct commit_list *todo_list,
struct replay_opts *opts)
{
struct commit_list *cur = NULL;
const char *sha1_abbrev = NULL;
const char *action_str = opts->action == REPLAY_REVERT ? "revert" : "pick";
const char *subject;
int subject_len;

for (cur = todo_list; cur; cur = cur->next) {
sha1_abbrev = find_unique_abbrev(cur->item->object.sha1, DEFAULT_ABBREV);
subject_len = find_commit_subject(cur->item->buffer, &subject);
strbuf_addf(buf, "%s %s %.*s\n", action_str, sha1_abbrev,
subject_len, subject);
}
return 0;
}

static struct commit *parse_insn_line(char *bol, char *eol, struct replay_opts *opts)
{
unsigned char commit_sha1[20];
enum replay_action action;
char *end_of_object_name;
int saved, status, padding;

if (!prefixcmp(bol, "pick")) {
action = REPLAY_PICK;
bol += strlen("pick");
} else if (!prefixcmp(bol, "revert")) {
action = REPLAY_REVERT;
bol += strlen("revert");
} else
return NULL;

/* Eat up extra spaces/ tabs before object name */
padding = strspn(bol, " \t");
if (!padding)
return NULL;
bol += padding;

end_of_object_name = 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;

/*
* Verify that the action matches up with the one in
* opts; we don't support arbitrary instructions
*/
if (action != opts->action) {
const char *action_str;
action_str = action == REPLAY_REVERT ? "revert" : "cherry-pick";
error(_("Cannot %s during a %s"), action_str, action_name(opts));
return NULL;
}

if (status < 0)
return NULL;

return lookup_commit_reference(commit_sha1);
}

static int parse_insn_buffer(char *buf, struct commit_list **todo_list,
struct replay_opts *opts)
{
struct commit_list **next = todo_list;
struct commit *commit;
char *p = buf;
int i;

for (i = 1; *p; i++) {
char *eol = strchrnul(p, '\n');
commit = parse_insn_line(p, eol, opts);
if (!commit)
return error(_("Could not parse line %d."), i);
next = commit_list_append(commit, next);
p = *eol ? eol + 1 : eol;
}
if (!*todo_list)
return error(_("No commits parsed."));
return 0;
}

static void read_populate_todo(struct commit_list **todo_list,
struct replay_opts *opts)
{
const char *todo_file = git_path(SEQ_TODO_FILE);
struct strbuf buf = STRBUF_INIT;
int fd, res;

fd = open(todo_file, O_RDONLY);
if (fd < 0)
die_errno(_("Could not open %s"), todo_file);
if (strbuf_read(&buf, fd, 0) < 0) {
close(fd);
strbuf_release(&buf);
die(_("Could not read %s."), todo_file);
}
close(fd);

res = parse_insn_buffer(buf.buf, todo_list, opts);
strbuf_release(&buf);
if (res)
die(_("Unusable instruction sheet: %s"), todo_file);
}

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(&opts->strategy, 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 void read_populate_opts(struct replay_opts **opts_ptr)
{
const char *opts_file = git_path(SEQ_OPTS_FILE);

if (!file_exists(opts_file))
return;
if (git_config_from_file(populate_opts_cb, opts_file, *opts_ptr) < 0)
die(_("Malformed options sheet: %s"), opts_file);
}

static void walk_revs_populate_todo(struct commit_list **todo_list,
struct replay_opts *opts)
{
struct commit *commit;
struct commit_list **next;

prepare_revs(opts);

next = todo_list;
while ((commit = get_revision(opts->revs)))
next = commit_list_append(commit, next);
}

static int create_seq_dir(void)
{
const char *seq_dir = git_path(SEQ_DIR);

if (file_exists(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(seq_dir, 0777) < 0)
die_errno(_("Could not create sequencer directory %s"), seq_dir);
return 0;
}

static void save_head(const char *head)
{
const char *head_file = git_path(SEQ_HEAD_FILE);
static struct lock_file head_lock;
struct strbuf buf = STRBUF_INIT;
int fd;

fd = hold_lock_file_for_update(&head_lock, head_file, LOCK_DIE_ON_ERROR);
strbuf_addf(&buf, "%s\n", head);
if (write_in_full(fd, buf.buf, buf.len) < 0)
die_errno(_("Could not write to %s"), head_file);
if (commit_lock_file(&head_lock) < 0)
die(_("Error wrapping up %s."), head_file);
}

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", head_sha1, 0, 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);
}

static int sequencer_rollback(struct replay_opts *opts)
{
const char *filename;
FILE *f;
unsigned char sha1[20];
struct strbuf buf = STRBUF_INIT;

filename = git_path(SEQ_HEAD_FILE);
f = fopen(filename, "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(_("cannot open %s: %s"), filename,
strerror(errno));
if (strbuf_getline(&buf, f, '\n')) {
error(_("cannot read %s: %s"), filename, 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"),
filename);
goto fail;
}
if (reset_for_rollback(sha1))
goto fail;
remove_sequencer_state();
strbuf_release(&buf);
return 0;
fail:
strbuf_release(&buf);
return -1;
}

static void save_todo(struct commit_list *todo_list, struct replay_opts *opts)
{
const char *todo_file = git_path(SEQ_TODO_FILE);
static struct lock_file todo_lock;
struct strbuf buf = STRBUF_INIT;
int fd;

fd = hold_lock_file_for_update(&todo_lock, todo_file, LOCK_DIE_ON_ERROR);
if (format_todo(&buf, todo_list, opts) < 0)
die(_("Could not format %s."), todo_file);
if (write_in_full(fd, buf.buf, buf.len) < 0) {
strbuf_release(&buf);
die_errno(_("Could not write to %s"), todo_file);
}
if (commit_lock_file(&todo_lock) < 0) {
strbuf_release(&buf);
die(_("Error wrapping up %s."), todo_file);
}
strbuf_release(&buf);
}

static void save_opts(struct replay_opts *opts)
{
const char *opts_file = git_path(SEQ_OPTS_FILE);

if (opts->no_commit)
git_config_set_in_file(opts_file, "options.no-commit", "true");
if (opts->edit)
git_config_set_in_file(opts_file, "options.edit", "true");
if (opts->signoff)
git_config_set_in_file(opts_file, "options.signoff", "true");
if (opts->record_origin)
git_config_set_in_file(opts_file, "options.record-origin", "true");
if (opts->allow_ff)
git_config_set_in_file(opts_file, "options.allow-ff", "true");
if (opts->mainline) {
struct strbuf buf = STRBUF_INIT;
strbuf_addf(&buf, "%d", opts->mainline);
git_config_set_in_file(opts_file, "options.mainline", buf.buf);
strbuf_release(&buf);
}
if (opts->strategy)
git_config_set_in_file(opts_file, "options.strategy", opts->strategy);
if (opts->xopts) {
int i;
for (i = 0; i < opts->xopts_nr; i++)
git_config_set_multivar_in_file(opts_file,
"options.strategy-option",
opts->xopts[i], "^$", 0);
}
}

static int pick_commits(struct commit_list *todo_list, struct replay_opts *opts)
{
struct commit_list *cur;
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));
read_and_refresh_cache(opts);

for (cur = todo_list; cur; cur = cur->next) {
save_todo(cur, opts);
res = do_pick_commit(cur->item, opts);
if (res)
return res;
}

/*
* Sequence of picks finished successfully; cleanup by
* removing the .git/sequencer directory
*/
remove_sequencer_state();
return 0;
}

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);
}

static int sequencer_continue(struct replay_opts *opts)
{
struct commit_list *todo_list = NULL;

if (!file_exists(git_path(SEQ_TODO_FILE)))
return continue_single_pick();
read_populate_opts(&opts);
read_populate_todo(&todo_list, opts);

/* Verify that the conflict has been resolved */
if (file_exists(git_path("CHERRY_PICK_HEAD")) ||
file_exists(git_path("REVERT_HEAD"))) {
int ret = continue_single_pick();
if (ret)
return ret;
}
if (index_differs_from("HEAD", 0))
return error_dirty_index(opts);
todo_list = todo_list->next;
return pick_commits(todo_list, opts);
}

static int single_pick(struct commit *cmit, struct replay_opts *opts)
{
setenv(GIT_REFLOG_ACTION, action_name(opts), 0);
return do_pick_commit(cmit, opts);
}

int sequencer_pick_revisions(struct replay_opts *opts)
{
struct commit_list *todo_list = NULL;
unsigned char sha1[20];

if (opts->subcommand == REPLAY_NONE)
assert(opts->revs);

read_and_refresh_cache(opts);

/*
* Decide what to do depending on the arguments; a fresh
* cherry-pick should be handled differently from an existing
* one that is being continued
*/
if (opts->subcommand == REPLAY_REMOVE_STATE) {
remove_sequencer_state();
return 0;
}
if (opts->subcommand == REPLAY_ROLLBACK)
return sequencer_rollback(opts);
if (opts->subcommand == REPLAY_CONTINUE)
return sequencer_continue(opts);

/*
* 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))
die(_("revision walk setup failed"));
cmit = get_revision(opts->revs);
if (!cmit || get_revision(opts->revs))
die("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
*/

walk_revs_populate_todo(&todo_list, opts);
if (create_seq_dir() < 0)
return -1;
if (get_sha1("HEAD", sha1)) {
if (opts->action == REPLAY_REVERT)
return error(_("Can't revert as initial commit"));
return error(_("Can't cherry-pick into empty head"));
}
save_head(sha1_to_hex(sha1));
save_opts(opts);
return pick_commits(todo_list, opts);
}

static int ends_rfc2822_footer(struct strbuf *sb, int ignore_footer)
{
int ch;
int hit = 0;
int i, j, k;
int len = sb->len - ignore_footer;
int first = 1;
const char *buf = sb->buf;

for (i = len - 1; i > 0; i--) {
if (hit && buf[i] == '\n')
break;
hit = (buf[i] == '\n');
}

while (i < len - 1 && buf[i] == '\n')
i++;

for (; i < len; i = k) {
for (k = i; k < len && buf[k] != '\n'; k++)
; /* do nothing */
k++;

if ((buf[k] == ' ' || buf[k] == '\t') && !first)
continue;

first = 0;

for (j = 0; i + j < len; j++) {
ch = buf[i + j];
if (ch == ':')
break;
if (isalnum(ch) ||
(ch == '-'))
continue;
return 0;
}
}
return 1;
}

void append_signoff(struct strbuf *msgbuf, int ignore_footer)
{
struct strbuf sob = STRBUF_INIT;
int i;

strbuf_addstr(&sob, sign_off_header);
strbuf_addstr(&sob, fmt_name(getenv("GIT_COMMITTER_NAME"),
getenv("GIT_COMMITTER_EMAIL")));
strbuf_addch(&sob, '\n');
for (i = msgbuf->len - 1 - ignore_footer; i > 0 && msgbuf->buf[i - 1] != '\n'; i--)
; /* do nothing */
if (prefixcmp(msgbuf->buf + i, sob.buf)) {
if (!i || !ends_rfc2822_footer(msgbuf, ignore_footer))
strbuf_splice(msgbuf, msgbuf->len - ignore_footer, 0, "\n", 1);
strbuf_splice(msgbuf, msgbuf->len - ignore_footer, 0, sob.buf, sob.len);
}
strbuf_release(&sob);
}
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