2 * "git reset" builtin command
4 * Copyright (c) 2007 Carlos Rica
6 * Based on git-reset.sh, which is
8 * Copyright (c) 2005, 2006 Linus Torvalds and Junio C Hamano
15 #include "run-command.h"
21 #include "parse-options.h"
22 #include "unpack-trees.h"
23 #include "cache-tree.h"
24 #include "submodule.h"
25 #include "submodule-config.h"
27 static int recurse_submodules = RECURSE_SUBMODULES_DEFAULT;
29 static int option_parse_recurse_submodules(const struct option *opt,
30 const char *arg, int unset)
33 recurse_submodules = RECURSE_SUBMODULES_OFF;
38 parse_update_recurse_submodules_arg(opt->long_name,
41 recurse_submodules = RECURSE_SUBMODULES_ON;
46 static const char * const git_reset_usage[] = {
47 N_("git reset [--mixed | --soft | --hard | --merge | --keep] [-q] [<commit>]"),
48 N_("git reset [-q] [<tree-ish>] [--] <paths>..."),
49 N_("git reset --patch [<tree-ish>] [--] [<paths>...]"),
53 enum reset_type { MIXED, SOFT, HARD, MERGE, KEEP, NONE };
54 static const char *reset_type_names[] = {
55 N_("mixed"), N_("soft"), N_("hard"), N_("merge"), N_("keep"), NULL
58 static inline int is_merge(void)
60 return !access(git_path_merge_head(), F_OK);
63 static int reset_index(const struct object_id *oid, int reset_type, int quiet)
66 struct tree_desc desc[2];
68 struct unpack_trees_options opts;
70 memset(&opts, 0, sizeof(opts));
72 opts.src_index = &the_index;
73 opts.dst_index = &the_index;
74 opts.fn = oneway_merge;
77 opts.verbose_update = 1;
90 read_cache_unmerged();
92 if (reset_type == KEEP) {
93 struct object_id head_oid;
94 if (get_oid("HEAD", &head_oid))
95 return error(_("You do not have a valid HEAD."));
96 if (!fill_tree_descriptor(desc, head_oid.hash))
97 return error(_("Failed to find tree of HEAD."));
99 opts.fn = twoway_merge;
102 if (!fill_tree_descriptor(desc + nr - 1, oid->hash))
103 return error(_("Failed to find tree of %s."), oid_to_hex(oid));
104 if (unpack_trees(nr, desc, &opts))
107 if (reset_type == MIXED || reset_type == HARD) {
108 tree = parse_tree_indirect(oid);
109 prime_cache_tree(&the_index, tree);
115 static void print_new_head_line(struct commit *commit)
117 const char *hex, *body;
120 hex = find_unique_abbrev(commit->object.oid.hash, DEFAULT_ABBREV);
121 printf(_("HEAD is now at %s"), hex);
122 msg = logmsg_reencode(commit, NULL, get_log_output_encoding());
123 body = strstr(msg, "\n\n");
127 body = skip_blank_lines(body + 2);
128 eol = strchr(body, '\n');
129 len = eol ? eol - body : strlen(body);
130 printf(" %.*s\n", (int) len, body);
134 unuse_commit_buffer(commit, msg);
137 static void update_index_from_diff(struct diff_queue_struct *q,
138 struct diff_options *opt, void *data)
141 int intent_to_add = *(int *)data;
143 for (i = 0; i < q->nr; i++) {
144 struct diff_filespec *one = q->queue[i]->one;
145 int is_missing = !(one->mode && !is_null_oid(&one->oid));
146 struct cache_entry *ce;
148 if (is_missing && !intent_to_add) {
149 remove_file_from_cache(one->path);
153 ce = make_cache_entry(one->mode, one->oid.hash, one->path,
156 die(_("make_cache_entry failed for path '%s'"),
159 ce->ce_flags |= CE_INTENT_TO_ADD;
160 set_object_name_for_intent_to_add_entry(ce);
162 add_cache_entry(ce, ADD_CACHE_OK_TO_ADD | ADD_CACHE_OK_TO_REPLACE);
166 static int read_from_tree(const struct pathspec *pathspec,
167 struct object_id *tree_oid,
170 struct diff_options opt;
172 memset(&opt, 0, sizeof(opt));
173 copy_pathspec(&opt.pathspec, pathspec);
174 opt.output_format = DIFF_FORMAT_CALLBACK;
175 opt.format_callback = update_index_from_diff;
176 opt.format_callback_data = &intent_to_add;
178 if (do_diff_cache(tree_oid, &opt))
182 clear_pathspec(&opt.pathspec);
187 static void set_reflog_message(struct strbuf *sb, const char *action,
190 const char *rla = getenv("GIT_REFLOG_ACTION");
194 strbuf_addf(sb, "%s: %s", rla, action);
196 strbuf_addf(sb, "reset: moving to %s", rev);
198 strbuf_addf(sb, "reset: %s", action);
201 static void die_if_unmerged_cache(int reset_type)
203 if (is_merge() || unmerged_cache())
204 die(_("Cannot do a %s reset in the middle of a merge."),
205 _(reset_type_names[reset_type]));
209 static void parse_args(struct pathspec *pathspec,
210 const char **argv, const char *prefix,
212 const char **rev_ret)
214 const char *rev = "HEAD";
215 struct object_id unused;
217 * Possible arguments are:
219 * git reset [-opts] [<rev>]
220 * git reset [-opts] <tree> [<paths>...]
221 * git reset [-opts] <tree> -- [<paths>...]
222 * git reset [-opts] -- [<paths>...]
223 * git reset [-opts] <paths>...
225 * At this point, argv points immediately after [-opts].
229 if (!strcmp(argv[0], "--")) {
230 argv++; /* reset to HEAD, possibly with paths */
231 } else if (argv[1] && !strcmp(argv[1], "--")) {
236 * Otherwise, argv[0] could be either <rev> or <paths> and
237 * has to be unambiguous. If there is a single argument, it
240 else if ((!argv[1] && !get_sha1_committish(argv[0], unused.hash)) ||
241 (argv[1] && !get_sha1_treeish(argv[0], unused.hash))) {
243 * Ok, argv[0] looks like a commit/tree; it should not
246 verify_non_filename(prefix, argv[0]);
249 /* Otherwise we treat this as a filename */
250 verify_filename(prefix, argv[0], 1);
255 if (read_cache() < 0)
256 die(_("index file corrupt"));
258 parse_pathspec(pathspec, 0,
259 PATHSPEC_PREFER_FULL |
260 (patch_mode ? PATHSPEC_PREFIX_ORIGIN : 0),
264 static int reset_refs(const char *rev, const struct object_id *oid)
266 int update_ref_status;
267 struct strbuf msg = STRBUF_INIT;
268 struct object_id *orig = NULL, oid_orig,
269 *old_orig = NULL, oid_old_orig;
271 if (!get_oid("ORIG_HEAD", &oid_old_orig))
272 old_orig = &oid_old_orig;
273 if (!get_oid("HEAD", &oid_orig)) {
275 set_reflog_message(&msg, "updating ORIG_HEAD", NULL);
276 update_ref_oid(msg.buf, "ORIG_HEAD", orig, old_orig, 0,
277 UPDATE_REFS_MSG_ON_ERR);
279 delete_ref(NULL, "ORIG_HEAD", old_orig->hash, 0);
280 set_reflog_message(&msg, "updating HEAD", rev);
281 update_ref_status = update_ref_oid(msg.buf, "HEAD", oid, orig, 0,
282 UPDATE_REFS_MSG_ON_ERR);
283 strbuf_release(&msg);
284 return update_ref_status;
287 int cmd_reset(int argc, const char **argv, const char *prefix)
289 int reset_type = NONE, update_ref_status = 0, quiet = 0;
290 int patch_mode = 0, unborn;
292 struct object_id oid;
293 struct pathspec pathspec;
294 int intent_to_add = 0;
295 const struct option options[] = {
296 OPT__QUIET(&quiet, N_("be quiet, only report errors")),
297 OPT_SET_INT(0, "mixed", &reset_type,
298 N_("reset HEAD and index"), MIXED),
299 OPT_SET_INT(0, "soft", &reset_type, N_("reset only HEAD"), SOFT),
300 OPT_SET_INT(0, "hard", &reset_type,
301 N_("reset HEAD, index and working tree"), HARD),
302 OPT_SET_INT(0, "merge", &reset_type,
303 N_("reset HEAD, index and working tree"), MERGE),
304 OPT_SET_INT(0, "keep", &reset_type,
305 N_("reset HEAD but keep local changes"), KEEP),
306 { OPTION_CALLBACK, 0, "recurse-submodules", &recurse_submodules,
307 "reset", "control recursive updating of submodules",
308 PARSE_OPT_OPTARG, option_parse_recurse_submodules },
309 OPT_BOOL('p', "patch", &patch_mode, N_("select hunks interactively")),
310 OPT_BOOL('N', "intent-to-add", &intent_to_add,
311 N_("record only the fact that removed paths will be added later")),
315 git_config(git_default_config, NULL);
317 argc = parse_options(argc, argv, prefix, options, git_reset_usage,
318 PARSE_OPT_KEEP_DASHDASH);
319 parse_args(&pathspec, argv, prefix, patch_mode, &rev);
321 if (recurse_submodules != RECURSE_SUBMODULES_DEFAULT) {
323 git_config(submodule_config, NULL);
324 set_config_update_recurse_submodules(RECURSE_SUBMODULES_ON);
327 unborn = !strcmp(rev, "HEAD") && get_sha1("HEAD", oid.hash);
329 /* reset on unborn branch: treat as reset to empty tree */
330 hashcpy(oid.hash, EMPTY_TREE_SHA1_BIN);
331 } else if (!pathspec.nr) {
332 struct commit *commit;
333 if (get_sha1_committish(rev, oid.hash))
334 die(_("Failed to resolve '%s' as a valid revision."), rev);
335 commit = lookup_commit_reference(&oid);
337 die(_("Could not parse object '%s'."), rev);
338 oidcpy(&oid, &commit->object.oid);
341 if (get_sha1_treeish(rev, oid.hash))
342 die(_("Failed to resolve '%s' as a valid tree."), rev);
343 tree = parse_tree_indirect(&oid);
345 die(_("Could not parse object '%s'."), rev);
346 oidcpy(&oid, &tree->object.oid);
350 if (reset_type != NONE)
351 die(_("--patch is incompatible with --{hard,mixed,soft}"));
352 return run_add_interactive(rev, "--patch=reset", &pathspec);
355 /* git reset tree [--] paths... can be used to
356 * load chosen paths from the tree into the index without
357 * affecting the working tree nor HEAD. */
359 if (reset_type == MIXED)
360 warning(_("--mixed with paths is deprecated; use 'git reset -- <paths>' instead."));
361 else if (reset_type != NONE)
362 die(_("Cannot do %s reset with paths."),
363 _(reset_type_names[reset_type]));
365 if (reset_type == NONE)
366 reset_type = MIXED; /* by default */
368 if (reset_type != SOFT && (reset_type != MIXED || get_git_work_tree()))
371 if (reset_type == MIXED && is_bare_repository())
372 die(_("%s reset is not allowed in a bare repository"),
373 _(reset_type_names[reset_type]));
375 if (intent_to_add && reset_type != MIXED)
376 die(_("-N can only be used with --mixed"));
378 /* Soft reset does not touch the index file nor the working tree
379 * at all, but requires them in a good order. Other resets reset
380 * the index file to the tree object we are switching to. */
381 if (reset_type == SOFT || reset_type == KEEP)
382 die_if_unmerged_cache(reset_type);
384 if (reset_type != SOFT) {
385 struct lock_file *lock = xcalloc(1, sizeof(*lock));
386 hold_locked_index(lock, LOCK_DIE_ON_ERROR);
387 if (reset_type == MIXED) {
388 int flags = quiet ? REFRESH_QUIET : REFRESH_IN_PORCELAIN;
389 if (read_from_tree(&pathspec, &oid, intent_to_add))
391 if (get_git_work_tree())
392 refresh_index(&the_index, flags, NULL, NULL,
393 _("Unstaged changes after reset:"));
395 int err = reset_index(&oid, reset_type, quiet);
396 if (reset_type == KEEP && !err)
397 err = reset_index(&oid, MIXED, quiet);
399 die(_("Could not reset index file to revision '%s'."), rev);
402 if (write_locked_index(&the_index, lock, COMMIT_LOCK))
403 die(_("Could not write new index file."));
406 if (!pathspec.nr && !unborn) {
407 /* Any resets without paths update HEAD to the head being
408 * switched to, saving the previous head in ORIG_HEAD before. */
409 update_ref_status = reset_refs(rev, &oid);
411 if (reset_type == HARD && !update_ref_status && !quiet)
412 print_new_head_line(lookup_commit_reference(&oid));
415 remove_branch_state();
417 return update_ref_status;