diff options
Diffstat (limited to 'builtin/revert.c')
| -rw-r--r-- | builtin/revert.c | 1036 |
1 files changed, 1036 insertions, 0 deletions
diff --git a/builtin/revert.c b/builtin/revert.c new file mode 100644 index 0000000000..87df70edc3 --- /dev/null +++ b/builtin/revert.c @@ -0,0 +1,1036 @@ +#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_RESET, REPLAY_CONTINUE }; + +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 reset = 0; + int contin = 0; + struct option options[] = { + OPT_BOOLEAN(0, "reset", &reset, "forget the current operation"), + OPT_BOOLEAN(0, "continue", &contin, "continue the current operation"), + 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, + "--reset", reset, + "--continue", contin, + NULL); + + /* Set the subcommand */ + if (reset) + opts->subcommand = REPLAY_RESET; + else if (contin) + opts->subcommand = REPLAY_CONTINUE; + else + opts->subcommand = REPLAY_NONE; + + /* Check for incompatible command line arguments */ + if (opts->subcommand != REPLAY_NONE) { + char *this_operation; + if (opts->subcommand == REPLAY_RESET) + this_operation = "--reset"; + else + this_operation = "--continue"; + + 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) +{ + int fd; + struct strbuf buf = STRBUF_INIT; + + strbuf_addf(&buf, "%s\n", sha1_to_hex(commit->object.sha1)); + + fd = open(git_path("CHERRY_PICK_HEAD"), O_WRONLY | O_CREAT, 0666); + if (fd < 0) + die_errno(_("Could not open '%s' for writing"), + git_path("CHERRY_PICK_HEAD")); + if (write_in_full(fd, buf.buf, buf.len) != buf.len || close(fd)) + die_errno(_("Could not write to '%s'"), git_path("CHERRY_PICK_HEAD")); + 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); + + 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)) + return error(_("%s already exists."), seq_dir); + 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 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) { + if (!cur->next) + /* + * An error was encountered while + * picking the last commit; the + * sequencer state is useless now -- + * the user simply needs to resolve + * the conflict and commit + */ + remove_sequencer_state(0); + return res; + } + } + + /* + * Sequence of picks finished successfully; cleanup by + * removing the .git/sequencer directory + */ + remove_sequencer_state(1); + return 0; +} + +static int pick_revisions(struct replay_opts *opts) +{ + struct commit_list *todo_list = NULL; + unsigned char sha1[20]; + + 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_RESET) { + remove_sequencer_state(1); + return 0; + } else if (opts->subcommand == REPLAY_CONTINUE) { + if (!file_exists(git_path(SEQ_TODO_FILE))) + goto error; + read_populate_opts(&opts); + read_populate_todo(&todo_list, opts); + + /* Verify that the conflict has been resolved */ + if (!index_differs_from("HEAD", 0)) + todo_list = todo_list->next; + } else { + /* + * 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) { + error(_("A cherry-pick or revert is in progress.")); + advise(_("Use --continue to continue the operation")); + advise(_("or --reset to forget about it")); + 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); +error: + return error(_("No %s in progress"), action_name(opts)); +} + +int cmd_revert(int argc, const char **argv, const char *prefix) +{ + struct replay_opts opts; + int res; + + memset(&opts, 0, sizeof(opts)); + if (isatty(0)) + opts.edit = 1; + opts.action = REVERT; + git_config(git_default_config, NULL); + parse_args(argc, argv, &opts); + res = pick_revisions(&opts); + if (res < 0) + die(_("revert failed")); + return res; +} + +int cmd_cherry_pick(int argc, const char **argv, const char *prefix) +{ + struct replay_opts opts; + int res; + + memset(&opts, 0, sizeof(opts)); + opts.action = CHERRY_PICK; + git_config(git_default_config, NULL); + parse_args(argc, argv, &opts); + res = pick_revisions(&opts); + if (res < 0) + die(_("cherry-pick failed")); + return res; +} |