1/*
2 * "git reset" builtin command
3 *
4 * Copyright (c) 2007 Carlos Rica
5 *
6 * Based on git-reset.sh, which is
7 *
8 * Copyright (c) 2005, 2006 Linus Torvalds and Junio C Hamano
9 */
10#define USE_THE_INDEX_COMPATIBILITY_MACROS
11#include "builtin.h"
12#include "config.h"
13#include "lockfile.h"
14#include "tag.h"
15#include "object.h"
16#include "pretty.h"
17#include "run-command.h"
18#include "refs.h"
19#include "diff.h"
20#include "diffcore.h"
21#include "tree.h"
22#include "branch.h"
23#include "parse-options.h"
24#include "unpack-trees.h"
25#include "cache-tree.h"
26#include "submodule.h"
27#include "submodule-config.h"
28#define REFRESH_INDEX_DELAY_WARNING_IN_MS (2 * 1000)
30static const char * const git_reset_usage[] = {
32 N_("git reset [--mixed | --soft | --hard | --merge | --keep] [-q] [<commit>]"),
33 N_("git reset [-q] [<tree-ish>] [--] <paths>..."),
34 N_("git reset --patch [<tree-ish>] [--] [<paths>...]"),
35 NULL
36};
37enum reset_type { MIXED, SOFT, HARD, MERGE, KEEP, NONE };
39static const char *reset_type_names[] = {
40 N_("mixed"), N_("soft"), N_("hard"), N_("merge"), N_("keep"), NULL
41};
42static inline int is_merge(void)
44{
45 return !access(git_path_merge_head(the_repository), F_OK);
46}
47static int reset_index(const struct object_id *oid, int reset_type, int quiet)
49{
50 int i, nr = 0;
51 struct tree_desc desc[2];
52 struct tree *tree;
53 struct unpack_trees_options opts;
54 int ret = -1;
55 memset(&opts, 0, sizeof(opts));
57 opts.head_idx = 1;
58 opts.src_index = &the_index;
59 opts.dst_index = &the_index;
60 opts.fn = oneway_merge;
61 opts.merge = 1;
62 if (!quiet)
63 opts.verbose_update = 1;
64 switch (reset_type) {
65 case KEEP:
66 case MERGE:
67 opts.update = 1;
68 break;
69 case HARD:
70 opts.update = 1;
71 /* fallthrough */
72 default:
73 opts.reset = 1;
74 }
75 read_cache_unmerged();
77 if (reset_type == KEEP) {
79 struct object_id head_oid;
80 if (get_oid("HEAD", &head_oid))
81 return error(_("You do not have a valid HEAD."));
82 if (!fill_tree_descriptor(desc + nr, &head_oid))
83 return error(_("Failed to find tree of HEAD."));
84 nr++;
85 opts.fn = twoway_merge;
86 }
87 if (!fill_tree_descriptor(desc + nr, oid)) {
89 error(_("Failed to find tree of %s."), oid_to_hex(oid));
90 goto out;
91 }
92 nr++;
93 if (unpack_trees(nr, desc, &opts))
95 goto out;
96 if (reset_type == MIXED || reset_type == HARD) {
98 tree = parse_tree_indirect(oid);
99 prime_cache_tree(the_repository, the_repository->index, tree);
100 }
101 ret = 0;
103out:
105 for (i = 0; i < nr; i++)
106 free((void *)desc[i].buffer);
107 return ret;
108}
109static void print_new_head_line(struct commit *commit)
111{
112 struct strbuf buf = STRBUF_INIT;
113 printf(_("HEAD is now at %s"),
115 find_unique_abbrev(&commit->object.oid, DEFAULT_ABBREV));
116 pp_commit_easy(CMIT_FMT_ONELINE, commit, &buf);
118 if (buf.len > 0)
119 printf(" %s", buf.buf);
120 putchar('\n');
121 strbuf_release(&buf);
122}
123static void update_index_from_diff(struct diff_queue_struct *q,
125 struct diff_options *opt, void *data)
126{
127 int i;
128 int intent_to_add = *(int *)data;
129 for (i = 0; i < q->nr; i++) {
131 struct diff_filespec *one = q->queue[i]->one;
132 int is_missing = !(one->mode && !is_null_oid(&one->oid));
133 struct cache_entry *ce;
134 if (is_missing && !intent_to_add) {
136 remove_file_from_cache(one->path);
137 continue;
138 }
139 ce = make_cache_entry(&the_index, one->mode, &one->oid, one->path,
141 0, 0);
142 if (!ce)
143 die(_("make_cache_entry failed for path '%s'"),
144 one->path);
145 if (is_missing) {
146 ce->ce_flags |= CE_INTENT_TO_ADD;
147 set_object_name_for_intent_to_add_entry(ce);
148 }
149 add_cache_entry(ce, ADD_CACHE_OK_TO_ADD | ADD_CACHE_OK_TO_REPLACE);
150 }
151}
152static int read_from_tree(const struct pathspec *pathspec,
154 struct object_id *tree_oid,
155 int intent_to_add)
156{
157 struct diff_options opt;
158 memset(&opt, 0, sizeof(opt));
160 copy_pathspec(&opt.pathspec, pathspec);
161 opt.output_format = DIFF_FORMAT_CALLBACK;
162 opt.format_callback = update_index_from_diff;
163 opt.format_callback_data = &intent_to_add;
164 opt.flags.override_submodule_config = 1;
165 opt.repo = the_repository;
166 if (do_diff_cache(tree_oid, &opt))
168 return 1;
169 diffcore_std(&opt);
170 diff_flush(&opt);
171 clear_pathspec(&opt.pathspec);
172 return 0;
174}
175static void set_reflog_message(struct strbuf *sb, const char *action,
177 const char *rev)
178{
179 const char *rla = getenv("GIT_REFLOG_ACTION");
180 strbuf_reset(sb);
182 if (rla)
183 strbuf_addf(sb, "%s: %s", rla, action);
184 else if (rev)
185 strbuf_addf(sb, "reset: moving to %s", rev);
186 else
187 strbuf_addf(sb, "reset: %s", action);
188}
189static void die_if_unmerged_cache(int reset_type)
191{
192 if (is_merge() || unmerged_cache())
193 die(_("Cannot do a %s reset in the middle of a merge."),
194 _(reset_type_names[reset_type]));
195}
197static void parse_args(struct pathspec *pathspec,
199 const char **argv, const char *prefix,
200 int patch_mode,
201 const char **rev_ret)
202{
203 const char *rev = "HEAD";
204 struct object_id unused;
205 /*
206 * Possible arguments are:
207 *
208 * git reset [-opts] [<rev>]
209 * git reset [-opts] <tree> [<paths>...]
210 * git reset [-opts] <tree> -- [<paths>...]
211 * git reset [-opts] -- [<paths>...]
212 * git reset [-opts] <paths>...
213 *
214 * At this point, argv points immediately after [-opts].
215 */
216 if (argv[0]) {
218 if (!strcmp(argv[0], "--")) {
219 argv++; /* reset to HEAD, possibly with paths */
220 } else if (argv[1] && !strcmp(argv[1], "--")) {
221 rev = argv[0];
222 argv += 2;
223 }
224 /*
225 * Otherwise, argv[0] could be either <rev> or <paths> and
226 * has to be unambiguous. If there is a single argument, it
227 * can not be a tree
228 */
229 else if ((!argv[1] && !get_oid_committish(argv[0], &unused)) ||
230 (argv[1] && !get_oid_treeish(argv[0], &unused))) {
231 /*
232 * Ok, argv[0] looks like a commit/tree; it should not
233 * be a filename.
234 */
235 verify_non_filename(prefix, argv[0]);
236 rev = *argv++;
237 } else {
238 /* Otherwise we treat this as a filename */
239 verify_filename(prefix, argv[0], 1);
240 }
241 }
242 *rev_ret = rev;
243 if (read_cache() < 0)
245 die(_("index file corrupt"));
246 parse_pathspec(pathspec, 0,
248 PATHSPEC_PREFER_FULL |
249 (patch_mode ? PATHSPEC_PREFIX_ORIGIN : 0),
250 prefix, argv);
251}
252static int reset_refs(const char *rev, const struct object_id *oid)
254{
255 int update_ref_status;
256 struct strbuf msg = STRBUF_INIT;
257 struct object_id *orig = NULL, oid_orig,
258 *old_orig = NULL, oid_old_orig;
259 if (!get_oid("ORIG_HEAD", &oid_old_orig))
261 old_orig = &oid_old_orig;
262 if (!get_oid("HEAD", &oid_orig)) {
263 orig = &oid_orig;
264 set_reflog_message(&msg, "updating ORIG_HEAD", NULL);
265 update_ref(msg.buf, "ORIG_HEAD", orig, old_orig, 0,
266 UPDATE_REFS_MSG_ON_ERR);
267 } else if (old_orig)
268 delete_ref(NULL, "ORIG_HEAD", old_orig, 0);
269 set_reflog_message(&msg, "updating HEAD", rev);
270 update_ref_status = update_ref(msg.buf, "HEAD", oid, orig, 0,
271 UPDATE_REFS_MSG_ON_ERR);
272 strbuf_release(&msg);
273 return update_ref_status;
274}
275static int git_reset_config(const char *var, const char *value, void *cb)
277{
278 if (!strcmp(var, "submodule.recurse"))
279 return git_default_submodule_config(var, value, cb);
280 return git_default_config(var, value, cb);
282}
283int cmd_reset(int argc, const char **argv, const char *prefix)
285{
286 int reset_type = NONE, update_ref_status = 0, quiet = 0;
287 int patch_mode = 0, unborn;
288 const char *rev;
289 struct object_id oid;
290 struct pathspec pathspec;
291 int intent_to_add = 0;
292 const struct option options[] = {
293 OPT__QUIET(&quiet, N_("be quiet, only report errors")),
294 OPT_SET_INT(0, "mixed", &reset_type,
295 N_("reset HEAD and index"), MIXED),
296 OPT_SET_INT(0, "soft", &reset_type, N_("reset only HEAD"), SOFT),
297 OPT_SET_INT(0, "hard", &reset_type,
298 N_("reset HEAD, index and working tree"), HARD),
299 OPT_SET_INT(0, "merge", &reset_type,
300 N_("reset HEAD, index and working tree"), MERGE),
301 OPT_SET_INT(0, "keep", &reset_type,
302 N_("reset HEAD but keep local changes"), KEEP),
303 { OPTION_CALLBACK, 0, "recurse-submodules", NULL,
304 "reset", "control recursive updating of submodules",
305 PARSE_OPT_OPTARG, option_parse_recurse_submodules_worktree_updater },
306 OPT_BOOL('p', "patch", &patch_mode, N_("select hunks interactively")),
307 OPT_BOOL('N', "intent-to-add", &intent_to_add,
308 N_("record only the fact that removed paths will be added later")),
309 OPT_END()
310 };
311 git_config(git_reset_config, NULL);
313 git_config_get_bool("reset.quiet", &quiet);
314 argc = parse_options(argc, argv, prefix, options, git_reset_usage,
316 PARSE_OPT_KEEP_DASHDASH);
317 parse_args(&pathspec, argv, prefix, patch_mode, &rev);
318 unborn = !strcmp(rev, "HEAD") && get_oid("HEAD", &oid);
320 if (unborn) {
321 /* reset on unborn branch: treat as reset to empty tree */
322 oidcpy(&oid, the_hash_algo->empty_tree);
323 } else if (!pathspec.nr) {
324 struct commit *commit;
325 if (get_oid_committish(rev, &oid))
326 die(_("Failed to resolve '%s' as a valid revision."), rev);
327 commit = lookup_commit_reference(the_repository, &oid);
328 if (!commit)
329 die(_("Could not parse object '%s'."), rev);
330 oidcpy(&oid, &commit->object.oid);
331 } else {
332 struct tree *tree;
333 if (get_oid_treeish(rev, &oid))
334 die(_("Failed to resolve '%s' as a valid tree."), rev);
335 tree = parse_tree_indirect(&oid);
336 if (!tree)
337 die(_("Could not parse object '%s'."), rev);
338 oidcpy(&oid, &tree->object.oid);
339 }
340 if (patch_mode) {
342 if (reset_type != NONE)
343 die(_("--patch is incompatible with --{hard,mixed,soft}"));
344 return run_add_interactive(rev, "--patch=reset", &pathspec);
345 }
346 /* git reset tree [--] paths... can be used to
348 * load chosen paths from the tree into the index without
349 * affecting the working tree nor HEAD. */
350 if (pathspec.nr) {
351 if (reset_type == MIXED)
352 warning(_("--mixed with paths is deprecated; use 'git reset -- <paths>' instead."));
353 else if (reset_type != NONE)
354 die(_("Cannot do %s reset with paths."),
355 _(reset_type_names[reset_type]));
356 }
357 if (reset_type == NONE)
358 reset_type = MIXED; /* by default */
359 if (reset_type != SOFT && (reset_type != MIXED || get_git_work_tree()))
361 setup_work_tree();
362 if (reset_type == MIXED && is_bare_repository())
364 die(_("%s reset is not allowed in a bare repository"),
365 _(reset_type_names[reset_type]));
366 if (intent_to_add && reset_type != MIXED)
368 die(_("-N can only be used with --mixed"));
369 /* Soft reset does not touch the index file nor the working tree
371 * at all, but requires them in a good order. Other resets reset
372 * the index file to the tree object we are switching to. */
373 if (reset_type == SOFT || reset_type == KEEP)
374 die_if_unmerged_cache(reset_type);
375 if (reset_type != SOFT) {
377 struct lock_file lock = LOCK_INIT;
378 hold_locked_index(&lock, LOCK_DIE_ON_ERROR);
379 if (reset_type == MIXED) {
380 int flags = quiet ? REFRESH_QUIET : REFRESH_IN_PORCELAIN;
381 if (read_from_tree(&pathspec, &oid, intent_to_add))
382 return 1;
383 if (!quiet && get_git_work_tree()) {
384 uint64_t t_begin, t_delta_in_ms;
385 t_begin = getnanotime();
387 refresh_index(&the_index, flags, NULL, NULL,
388 _("Unstaged changes after reset:"));
389 t_delta_in_ms = (getnanotime() - t_begin) / 1000000;
390 if (advice_reset_quiet_warning && t_delta_in_ms > REFRESH_INDEX_DELAY_WARNING_IN_MS) {
391 printf(_("\nIt took %.2f seconds to enumerate unstaged changes after reset. You can\n"
392 "use '--quiet' to avoid this. Set the config setting reset.quiet to true\n"
393 "to make this the default.\n"), t_delta_in_ms / 1000.0);
394 }
395 }
396 } else {
397 int err = reset_index(&oid, reset_type, quiet);
398 if (reset_type == KEEP && !err)
399 err = reset_index(&oid, MIXED, quiet);
400 if (err)
401 die(_("Could not reset index file to revision '%s'."), rev);
402 }
403 if (write_locked_index(&the_index, &lock, COMMIT_LOCK))
405 die(_("Could not write new index file."));
406 }
407 if (!pathspec.nr && !unborn) {
409 /* Any resets without paths update HEAD to the head being
410 * switched to, saving the previous head in ORIG_HEAD before. */
411 update_ref_status = reset_refs(rev, &oid);
412 if (reset_type == HARD && !update_ref_status && !quiet)
414 print_new_head_line(lookup_commit_reference(the_repository, &oid));
415 }
416 if (!pathspec.nr)
417 remove_branch_state(the_repository);
418 return update_ref_status;
420}