diff options
| -rw-r--r-- | builtin/revert.c | 953 | ||||
| -rw-r--r-- | sequencer.c | 917 | ||||
| -rw-r--r-- | sequencer.h | 37 |
3 files changed, 960 insertions, 947 deletions
diff --git a/builtin/revert.c b/builtin/revert.c index df63794e05..e6840f23dc 100644 --- a/builtin/revert.c +++ b/builtin/revert.c @@ -1,18 +1,9 @@ #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" @@ -39,49 +30,14 @@ static const char * const cherry_pick_usage[] = { 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; - - /* Merge strategy */ - const char *strategy; - const char **xopts; - size_t xopts_nr, xopts_alloc; - - /* Only used by REPLAY_NONE */ - struct rev_info *revs; -}; - -#define GIT_REFLOG_ACTION "GIT_REFLOG_ACTION" - static const char *action_name(const struct replay_opts *opts) { - return opts->action == REVERT ? "revert" : "cherry-pick"; + return opts->action == REPLAY_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; + return opts->action == REPLAY_REVERT ? revert_usage : cherry_pick_usage; } static int option_parse_x(const struct option *opt, @@ -160,7 +116,7 @@ static void parse_args(int argc, const char **argv, struct replay_opts *opts) OPT_END(), }; - if (opts->action == CHERRY_PICK) { + if (opts->action == REPLAY_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"), @@ -237,901 +193,6 @@ static void parse_args(int argc, const char **argv, struct replay_opts *opts) usage_with_options(usage_str, options); } -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\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((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 replay_opts *opts) -{ - if (opts->action != REVERT) - 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); -} - -/* - * 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; - const char *sha1_abbrev = NULL; - const char *action_str = opts->action == 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 = CHERRY_PICK; - bol += strlen("pick"); - } else if (!prefixcmp(bol, "revert")) { - action = 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 == 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); -} - -static int 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 == 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); -} - int cmd_revert(int argc, const char **argv, const char *prefix) { struct replay_opts opts; @@ -1140,10 +201,10 @@ int cmd_revert(int argc, const char **argv, const char *prefix) memset(&opts, 0, sizeof(opts)); if (isatty(0)) opts.edit = 1; - opts.action = REVERT; + opts.action = REPLAY_REVERT; git_config(git_default_config, NULL); parse_args(argc, argv, &opts); - res = pick_revisions(&opts); + res = sequencer_pick_revisions(&opts); if (res < 0) die(_("revert failed")); return res; @@ -1155,10 +216,10 @@ int cmd_cherry_pick(int argc, const char **argv, const char *prefix) int res; memset(&opts, 0, sizeof(opts)); - opts.action = CHERRY_PICK; + opts.action = REPLAY_PICK; git_config(git_default_config, NULL); parse_args(argc, argv, &opts); - res = pick_revisions(&opts); + res = sequencer_pick_revisions(&opts); if (res < 0) die(_("cherry-pick failed")); return res; diff --git a/sequencer.c b/sequencer.c index d1f28a6945..5fcbcb8875 100644 --- a/sequencer.c +++ b/sequencer.c @@ -1,7 +1,20 @@ #include "cache.h" #include "sequencer.h" -#include "strbuf.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" + +#define GIT_REFLOG_ACTION "GIT_REFLOG_ACTION" void remove_sequencer_state(void) { @@ -11,3 +24,905 @@ void remove_sequencer_state(void) 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 (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\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((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 == 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) +{ + 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 == 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); + 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 replay_opts *opts) +{ + if (opts->action != REPLAY_REVERT) + 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); +} + +/* + * 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; + 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); +} diff --git a/sequencer.h b/sequencer.h index 2d4528f292..bb4b13830e 100644 --- a/sequencer.h +++ b/sequencer.h @@ -6,7 +6,44 @@ #define SEQ_TODO_FILE "sequencer/todo" #define SEQ_OPTS_FILE "sequencer/opts" +enum replay_action { + REPLAY_REVERT, + REPLAY_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; + + /* Merge strategy */ + const char *strategy; + const char **xopts; + size_t xopts_nr, xopts_alloc; + + /* Only used by REPLAY_NONE */ + struct rev_info *revs; +}; + /* Removes SEQ_DIR. */ extern void remove_sequencer_state(void); +int sequencer_pick_revisions(struct replay_opts *opts); + #endif |