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revert.c
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revert.c
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#include "cache.h"
#include "builtin.h"
#include "object.h"
#include "commit.h"
#include "tag.h"
#include "run-command.h"
#include "exec_cmd.h"
#include "utf8.h"
#include "parse-options.h"
#include "cache-tree.h"
#include "diff.h"
#include "revision.h"
#include "rerere.h"
#include "merge-recursive.h"
#include "refs.h"
#include "dir.h"
#include "sequencer.h"
/*
* This implements the builtins revert and cherry-pick.
*
* Copyright (c) 2007 Johannes E. Schindelin
*
* Based on git-revert.sh, which is
*
* Copyright (c) 2005 Linus Torvalds
* Copyright (c) 2005 Junio C Hamano
*/
static const char * const revert_usage[] = {
"git revert [options] <commit-ish>",
"git revert <subcommand>",
NULL
};
static const char * const cherry_pick_usage[] = {
"git cherry-pick [options] <commit-ish>",
"git cherry-pick <subcommand>",
NULL
};
enum replay_action { REVERT, CHERRY_PICK };
enum replay_subcommand {
REPLAY_NONE,
REPLAY_REMOVE_STATE,
REPLAY_CONTINUE,
REPLAY_ROLLBACK
};
struct replay_opts {
enum replay_action action;
enum replay_subcommand subcommand;
/* Boolean options */
int edit;
int record_origin;
int no_commit;
int signoff;
int allow_ff;
int allow_rerere_auto;
int mainline;
int commit_argc;
const char **commit_argv;
/* Merge strategy */
const char *strategy;
const char **xopts;
size_t xopts_nr, xopts_alloc;
};
#define GIT_REFLOG_ACTION "GIT_REFLOG_ACTION"
static const char *action_name(const struct replay_opts *opts)
{
return opts->action == REVERT ? "revert" : "cherry-pick";
}
static char *get_encoding(const char *message);
static const char * const *revert_or_cherry_pick_usage(struct replay_opts *opts)
{
return opts->action == REVERT ? revert_usage : cherry_pick_usage;
}
static int option_parse_x(const struct option *opt,
const char *arg, int unset)
{
struct replay_opts **opts_ptr = opt->value;
struct replay_opts *opts = *opts_ptr;
if (unset)
return 0;
ALLOC_GROW(opts->xopts, opts->xopts_nr + 1, opts->xopts_alloc);
opts->xopts[opts->xopts_nr++] = xstrdup(arg);
return 0;
}
static void verify_opt_compatible(const char *me, const char *base_opt, ...)
{
const char *this_opt;
va_list ap;
va_start(ap, base_opt);
while ((this_opt = va_arg(ap, const char *))) {
if (va_arg(ap, int))
break;
}
va_end(ap);
if (this_opt)
die(_("%s: %s cannot be used with %s"), me, this_opt, base_opt);
}
static void verify_opt_mutually_compatible(const char *me, ...)
{
const char *opt1, *opt2 = NULL;
va_list ap;
va_start(ap, me);
while ((opt1 = va_arg(ap, const char *))) {
if (va_arg(ap, int))
break;
}
if (opt1) {
while ((opt2 = va_arg(ap, const char *))) {
if (va_arg(ap, int))
break;
}
}
if (opt1 && opt2)
die(_("%s: %s cannot be used with %s"), me, opt1, opt2);
}
static void parse_args(int argc, const char **argv, struct replay_opts *opts)
{
const char * const * usage_str = revert_or_cherry_pick_usage(opts);
const char *me = action_name(opts);
int remove_state = 0;
int contin = 0;
int rollback = 0;
struct option options[] = {
OPT_BOOLEAN(0, "quit", &remove_state, "end revert or cherry-pick sequence"),
OPT_BOOLEAN(0, "continue", &contin, "resume revert or cherry-pick sequence"),
OPT_BOOLEAN(0, "abort", &rollback, "cancel revert or cherry-pick sequence"),
OPT_BOOLEAN('n', "no-commit", &opts->no_commit, "don't automatically commit"),
OPT_BOOLEAN('e', "edit", &opts->edit, "edit the commit message"),
OPT_NOOP_NOARG('r', NULL),
OPT_BOOLEAN('s', "signoff", &opts->signoff, "add Signed-off-by:"),
OPT_INTEGER('m', "mainline", &opts->mainline, "parent number"),
OPT_RERERE_AUTOUPDATE(&opts->allow_rerere_auto),
OPT_STRING(0, "strategy", &opts->strategy, "strategy", "merge strategy"),
OPT_CALLBACK('X', "strategy-option", &opts, "option",
"option for merge strategy", option_parse_x),
OPT_END(),
OPT_END(),
OPT_END(),
};
if (opts->action == CHERRY_PICK) {
struct option cp_extra[] = {
OPT_BOOLEAN('x', NULL, &opts->record_origin, "append commit name"),
OPT_BOOLEAN(0, "ff", &opts->allow_ff, "allow fast-forward"),
OPT_END(),
};
if (parse_options_concat(options, ARRAY_SIZE(options), cp_extra))
die(_("program error"));
}
opts->commit_argc = parse_options(argc, argv, NULL, options, usage_str,
PARSE_OPT_KEEP_ARGV0 |
PARSE_OPT_KEEP_UNKNOWN);
/* Check for incompatible subcommands */
verify_opt_mutually_compatible(me,
"--quit", remove_state,
"--continue", contin,
"--abort", rollback,
NULL);
/* Set the subcommand */
if (remove_state)
opts->subcommand = REPLAY_REMOVE_STATE;
else if (contin)
opts->subcommand = REPLAY_CONTINUE;
else if (rollback)
opts->subcommand = REPLAY_ROLLBACK;
else
opts->subcommand = REPLAY_NONE;
/* Check for incompatible command line arguments */
if (opts->subcommand != REPLAY_NONE) {
char *this_operation;
if (opts->subcommand == REPLAY_REMOVE_STATE)
this_operation = "--quit";
else if (opts->subcommand == REPLAY_CONTINUE)
this_operation = "--continue";
else {
assert(opts->subcommand == REPLAY_ROLLBACK);
this_operation = "--abort";
}
verify_opt_compatible(me, this_operation,
"--no-commit", opts->no_commit,
"--signoff", opts->signoff,
"--mainline", opts->mainline,
"--strategy", opts->strategy ? 1 : 0,
"--strategy-option", opts->xopts ? 1 : 0,
"-x", opts->record_origin,
"--ff", opts->allow_ff,
NULL);
}
else if (opts->commit_argc < 2)
usage_with_options(usage_str, options);
if (opts->allow_ff)
verify_opt_compatible(me, "--ff",
"--signoff", opts->signoff,
"--no-commit", opts->no_commit,
"-x", opts->record_origin,
"--edit", opts->edit,
NULL);
opts->commit_argv = argv;
}
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 (strcmp(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)
{
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) {
advise("after resolving the conflicts, mark the corrected paths");
advise("with 'git add <paths>' or 'git rm <paths>'");
advise("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((const unsigned char *)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 == CHERRY_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)
{
struct ref_lock *ref_lock;
read_cache();
if (checkout_fast_forward(from, to))
exit(1); /* the callee should have complained already */
ref_lock = lock_any_ref_for_update("HEAD", 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 (!clean) {
int i;
strbuf_addstr(msgbuf, "\nConflicts:\n\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;
}
/*
* 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)
{
/* 6 is max possible length of our args array including NULL */
const char *args[6];
int i = 0;
args[i++] = "commit";
args[i++] = "-n";
if (opts->signoff)
args[i++] = "-s";
if (!opts->edit) {
args[i++] = "-F";
args[i++] = defmsg;
}
args[i] = NULL;
return run_command_v_opt(args, RUN_GIT_CMD);
}
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;
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 {
if (get_sha1("HEAD", head))
return error(_("You do not have a valid HEAD"));
if (index_differs_from("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))
return fast_forward_to(commit->object.sha1, head);
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 == 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 == 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 == CHERRY_PICK && !opts->no_commit && (res == 0 || res == 1))
write_cherry_pick_head(commit, "CHERRY_PICK_HEAD");
if (opts->action == REVERT && ((opts->no_commit && res == 0) || res == 1))
write_cherry_pick_head(commit, "REVERT_HEAD");
if (res) {
error(opts->action == 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);
rerere(opts->allow_rerere_auto);
} else {
if (!opts->no_commit)
res = run_git_commit(defmsg, opts);
}
free_message(&msg);
free(defmsg);
return res;
}
static void prepare_revs(struct rev_info *revs, struct replay_opts *opts)
{
int argc;
init_revisions(revs, NULL);
revs->no_walk = 1;
if (opts->action != REVERT)
revs->reverse = 1;
argc = setup_revisions(opts->commit_argc, opts->commit_argv, revs, NULL);
if (argc > 1)
usage(*revert_or_cherry_pick_usage(opts));
if (prepare_revision_walk(revs))
die(_("revision walk setup failed"));
if (!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);
}
/*
* Append a commit to the end of the commit_list.
*
* next starts by pointing to the variable that holds the head of an
* empty commit_list, and is updated to point to the "next" field of
* the last item on the list as new commits are appended.
*
* Usage example:
*
* struct commit_list *list;
* struct commit_list **next = &list;
*
* next = commit_list_append(c1, next);
* next = commit_list_append(c2, next);
* assert(commit_list_count(list) == 2);
* return list;
*/
static struct commit_list **commit_list_append(struct commit *commit,
struct commit_list **next)
{
struct commit_list *new = xmalloc(sizeof(struct commit_list));
new->item = commit;
*next = new;
new->next = NULL;
return &new->next;
}
static int format_todo(struct strbuf *buf, struct commit_list *todo_list,
struct replay_opts *opts)
{
struct commit_list *cur = NULL;
struct commit_message msg = { NULL, NULL, NULL, NULL, NULL };
const char *sha1_abbrev = NULL;
const char *action_str = opts->action == REVERT ? "revert" : "pick";
for (cur = todo_list; cur; cur = cur->next) {
sha1_abbrev = find_unique_abbrev(cur->item->object.sha1, DEFAULT_ABBREV);
if (get_message(cur->item, &msg))
return error(_("Cannot get commit message for %s"), sha1_abbrev);
strbuf_addf(buf, "%s %s %s\n", action_str, sha1_abbrev, msg.subject);
}
return 0;
}
static struct commit *parse_insn_line(char *start, struct replay_opts *opts)
{
unsigned char commit_sha1[20];
char sha1_abbrev[40];
enum replay_action action;
int insn_len = 0;
char *p, *q;
if (!prefixcmp(start, "pick ")) {
action = CHERRY_PICK;
insn_len = strlen("pick");
p = start + insn_len + 1;
} else if (!prefixcmp(start, "revert ")) {
action = REVERT;
insn_len = strlen("revert");
p = start + insn_len + 1;
} else
return NULL;
q = strchr(p, ' ');
if (!q)
return NULL;
q++;
strlcpy(sha1_abbrev, p, q - p);
/*
* 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 == REVERT ? "revert" : "cherry-pick";
error(_("Cannot %s during a %s"), action_str, action_name(opts));
return NULL;
}
if (get_sha1(sha1_abbrev, commit_sha1) < 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++) {
commit = parse_insn_line(p, opts);
if (!commit)
return error(_("Could not parse line %d."), i);
next = commit_list_append(commit, next);
p = strchrnul(p, '\n');
if (*p)
p++;
}
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 rev_info revs;
struct commit *commit;
struct commit_list **next;
prepare_revs(&revs, opts);
next = todo_list;
while ((commit = get_revision(&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 (!resolve_ref("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(1);
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",