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#include "builtin.h"
11#include "config.h"
12#include "lockfile.h"
13#include "tag.h"
14#include "object.h"
15#include "commit.h"
16#include "run-command.h"
17#include "refs.h"
18#include "diff.h"
19#include "diffcore.h"
20#include "tree.h"
21#include "branch.h"
22#include "parse-options.h"
23#include "unpack-trees.h"
24#include "cache-tree.h"
25#include "submodule.h"
26#include "submodule-config.h"
27static const char * const git_reset_usage[] = {
29 N_("git reset [--mixed | --soft | --hard | --merge | --keep] [-q] [<commit>]"),
30 N_("git reset [-q] [<tree-ish>] [--] <paths>..."),
31 N_("git reset --patch [<tree-ish>] [--] [<paths>...]"),
32 NULL
33};
34enum reset_type { MIXED, SOFT, HARD, MERGE, KEEP, NONE };
36static const char *reset_type_names[] = {
37 N_("mixed"), N_("soft"), N_("hard"), N_("merge"), N_("keep"), NULL
38};
39static inline int is_merge(void)
41{
42 return !access(git_path_merge_head(), F_OK);
43}
44static int reset_index(const struct object_id *oid, int reset_type, int quiet)
46{
47 int i, nr = 0;
48 struct tree_desc desc[2];
49 struct tree *tree;
50 struct unpack_trees_options opts;
51 int ret = -1;
52 memset(&opts, 0, sizeof(opts));
54 opts.head_idx = 1;
55 opts.src_index = &the_index;
56 opts.dst_index = &the_index;
57 opts.fn = oneway_merge;
58 opts.merge = 1;
59 if (!quiet)
60 opts.verbose_update = 1;
61 switch (reset_type) {
62 case KEEP:
63 case MERGE:
64 opts.update = 1;
65 break;
66 case HARD:
67 opts.update = 1;
68 /* fallthrough */
69 default:
70 opts.reset = 1;
71 }
72 read_cache_unmerged();
74 if (reset_type == KEEP) {
76 struct object_id head_oid;
77 if (get_oid("HEAD", &head_oid))
78 return error(_("You do not have a valid HEAD."));
79 if (!fill_tree_descriptor(desc + nr, &head_oid))
80 return error(_("Failed to find tree of HEAD."));
81 nr++;
82 opts.fn = twoway_merge;
83 }
84 if (!fill_tree_descriptor(desc + nr, oid)) {
86 error(_("Failed to find tree of %s."), oid_to_hex(oid));
87 goto out;
88 }
89 nr++;
90 if (unpack_trees(nr, desc, &opts))
92 goto out;
93 if (reset_type == MIXED || reset_type == HARD) {
95 tree = parse_tree_indirect(oid);
96 prime_cache_tree(&the_index, tree);
97 }
98 ret = 0;
100out:
102 for (i = 0; i < nr; i++)
103 free((void *)desc[i].buffer);
104 return ret;
105}
106static void print_new_head_line(struct commit *commit)
108{
109 const char *hex, *body;
110 const char *msg;
111 hex = find_unique_abbrev(commit->object.oid.hash, DEFAULT_ABBREV);
113 printf(_("HEAD is now at %s"), hex);
114 msg = logmsg_reencode(commit, NULL, get_log_output_encoding());
115 body = strstr(msg, "\n\n");
116 if (body) {
117 const char *eol;
118 size_t len;
119 body = skip_blank_lines(body + 2);
120 eol = strchr(body, '\n');
121 len = eol ? eol - body : strlen(body);
122 printf(" %.*s\n", (int) len, body);
123 }
124 else
125 printf("\n");
126 unuse_commit_buffer(commit, msg);
127}
128static void update_index_from_diff(struct diff_queue_struct *q,
130 struct diff_options *opt, void *data)
131{
132 int i;
133 int intent_to_add = *(int *)data;
134 for (i = 0; i < q->nr; i++) {
136 struct diff_filespec *one = q->queue[i]->one;
137 int is_missing = !(one->mode && !is_null_oid(&one->oid));
138 struct cache_entry *ce;
139 if (is_missing && !intent_to_add) {
141 remove_file_from_cache(one->path);
142 continue;
143 }
144 ce = make_cache_entry(one->mode, one->oid.hash, one->path,
146 0, 0);
147 if (!ce)
148 die(_("make_cache_entry failed for path '%s'"),
149 one->path);
150 if (is_missing) {
151 ce->ce_flags |= CE_INTENT_TO_ADD;
152 set_object_name_for_intent_to_add_entry(ce);
153 }
154 add_cache_entry(ce, ADD_CACHE_OK_TO_ADD | ADD_CACHE_OK_TO_REPLACE);
155 }
156}
157static int read_from_tree(const struct pathspec *pathspec,
159 struct object_id *tree_oid,
160 int intent_to_add)
161{
162 struct diff_options opt;
163 memset(&opt, 0, sizeof(opt));
165 copy_pathspec(&opt.pathspec, pathspec);
166 opt.output_format = DIFF_FORMAT_CALLBACK;
167 opt.format_callback = update_index_from_diff;
168 opt.format_callback_data = &intent_to_add;
169 opt.flags |= DIFF_OPT_OVERRIDE_SUBMODULE_CONFIG;
170 if (do_diff_cache(tree_oid, &opt))
172 return 1;
173 diffcore_std(&opt);
174 diff_flush(&opt);
175 clear_pathspec(&opt.pathspec);
176 return 0;
178}
179static void set_reflog_message(struct strbuf *sb, const char *action,
181 const char *rev)
182{
183 const char *rla = getenv("GIT_REFLOG_ACTION");
184 strbuf_reset(sb);
186 if (rla)
187 strbuf_addf(sb, "%s: %s", rla, action);
188 else if (rev)
189 strbuf_addf(sb, "reset: moving to %s", rev);
190 else
191 strbuf_addf(sb, "reset: %s", action);
192}
193static void die_if_unmerged_cache(int reset_type)
195{
196 if (is_merge() || unmerged_cache())
197 die(_("Cannot do a %s reset in the middle of a merge."),
198 _(reset_type_names[reset_type]));
199}
201static void parse_args(struct pathspec *pathspec,
203 const char **argv, const char *prefix,
204 int patch_mode,
205 const char **rev_ret)
206{
207 const char *rev = "HEAD";
208 struct object_id unused;
209 /*
210 * Possible arguments are:
211 *
212 * git reset [-opts] [<rev>]
213 * git reset [-opts] <tree> [<paths>...]
214 * git reset [-opts] <tree> -- [<paths>...]
215 * git reset [-opts] -- [<paths>...]
216 * git reset [-opts] <paths>...
217 *
218 * At this point, argv points immediately after [-opts].
219 */
220 if (argv[0]) {
222 if (!strcmp(argv[0], "--")) {
223 argv++; /* reset to HEAD, possibly with paths */
224 } else if (argv[1] && !strcmp(argv[1], "--")) {
225 rev = argv[0];
226 argv += 2;
227 }
228 /*
229 * Otherwise, argv[0] could be either <rev> or <paths> and
230 * has to be unambiguous. If there is a single argument, it
231 * can not be a tree
232 */
233 else if ((!argv[1] && !get_oid_committish(argv[0], &unused)) ||
234 (argv[1] && !get_oid_treeish(argv[0], &unused))) {
235 /*
236 * Ok, argv[0] looks like a commit/tree; it should not
237 * be a filename.
238 */
239 verify_non_filename(prefix, argv[0]);
240 rev = *argv++;
241 } else {
242 /* Otherwise we treat this as a filename */
243 verify_filename(prefix, argv[0], 1);
244 }
245 }
246 *rev_ret = rev;
247 if (read_cache() < 0)
249 die(_("index file corrupt"));
250 parse_pathspec(pathspec, 0,
252 PATHSPEC_PREFER_FULL |
253 (patch_mode ? PATHSPEC_PREFIX_ORIGIN : 0),
254 prefix, argv);
255}
256static int reset_refs(const char *rev, const struct object_id *oid)
258{
259 int update_ref_status;
260 struct strbuf msg = STRBUF_INIT;
261 struct object_id *orig = NULL, oid_orig,
262 *old_orig = NULL, oid_old_orig;
263 if (!get_oid("ORIG_HEAD", &oid_old_orig))
265 old_orig = &oid_old_orig;
266 if (!get_oid("HEAD", &oid_orig)) {
267 orig = &oid_orig;
268 set_reflog_message(&msg, "updating ORIG_HEAD", NULL);
269 update_ref(msg.buf, "ORIG_HEAD", orig, old_orig, 0,
270 UPDATE_REFS_MSG_ON_ERR);
271 } else if (old_orig)
272 delete_ref(NULL, "ORIG_HEAD", old_orig, 0);
273 set_reflog_message(&msg, "updating HEAD", rev);
274 update_ref_status = update_ref(msg.buf, "HEAD", oid, orig, 0,
275 UPDATE_REFS_MSG_ON_ERR);
276 strbuf_release(&msg);
277 return update_ref_status;
278}
279static int git_reset_config(const char *var, const char *value, void *cb)
281{
282 if (!strcmp(var, "submodule.recurse"))
283 return git_default_submodule_config(var, value, cb);
284 return git_default_config(var, value, cb);
286}
287int cmd_reset(int argc, const char **argv, const char *prefix)
289{
290 int reset_type = NONE, update_ref_status = 0, quiet = 0;
291 int patch_mode = 0, unborn;
292 const char *rev;
293 struct object_id oid;
294 struct pathspec pathspec;
295 int intent_to_add = 0;
296 const struct option options[] = {
297 OPT__QUIET(&quiet, N_("be quiet, only report errors")),
298 OPT_SET_INT(0, "mixed", &reset_type,
299 N_("reset HEAD and index"), MIXED),
300 OPT_SET_INT(0, "soft", &reset_type, N_("reset only HEAD"), SOFT),
301 OPT_SET_INT(0, "hard", &reset_type,
302 N_("reset HEAD, index and working tree"), HARD),
303 OPT_SET_INT(0, "merge", &reset_type,
304 N_("reset HEAD, index and working tree"), MERGE),
305 OPT_SET_INT(0, "keep", &reset_type,
306 N_("reset HEAD but keep local changes"), KEEP),
307 { OPTION_CALLBACK, 0, "recurse-submodules", NULL,
308 "reset", "control recursive updating of submodules",
309 PARSE_OPT_OPTARG, option_parse_recurse_submodules_worktree_updater },
310 OPT_BOOL('p', "patch", &patch_mode, N_("select hunks interactively")),
311 OPT_BOOL('N', "intent-to-add", &intent_to_add,
312 N_("record only the fact that removed paths will be added later")),
313 OPT_END()
314 };
315 git_config(git_reset_config, NULL);
317 argc = parse_options(argc, argv, prefix, options, git_reset_usage,
319 PARSE_OPT_KEEP_DASHDASH);
320 parse_args(&pathspec, argv, prefix, patch_mode, &rev);
321 unborn = !strcmp(rev, "HEAD") && get_oid("HEAD", &oid);
323 if (unborn) {
324 /* reset on unborn branch: treat as reset to empty tree */
325 hashcpy(oid.hash, EMPTY_TREE_SHA1_BIN);
326 } else if (!pathspec.nr) {
327 struct commit *commit;
328 if (get_oid_committish(rev, &oid))
329 die(_("Failed to resolve '%s' as a valid revision."), rev);
330 commit = lookup_commit_reference(&oid);
331 if (!commit)
332 die(_("Could not parse object '%s'."), rev);
333 oidcpy(&oid, &commit->object.oid);
334 } else {
335 struct tree *tree;
336 if (get_oid_treeish(rev, &oid))
337 die(_("Failed to resolve '%s' as a valid tree."), rev);
338 tree = parse_tree_indirect(&oid);
339 if (!tree)
340 die(_("Could not parse object '%s'."), rev);
341 oidcpy(&oid, &tree->object.oid);
342 }
343 if (patch_mode) {
345 if (reset_type != NONE)
346 die(_("--patch is incompatible with --{hard,mixed,soft}"));
347 return run_add_interactive(rev, "--patch=reset", &pathspec);
348 }
349 /* git reset tree [--] paths... can be used to
351 * load chosen paths from the tree into the index without
352 * affecting the working tree nor HEAD. */
353 if (pathspec.nr) {
354 if (reset_type == MIXED)
355 warning(_("--mixed with paths is deprecated; use 'git reset -- <paths>' instead."));
356 else if (reset_type != NONE)
357 die(_("Cannot do %s reset with paths."),
358 _(reset_type_names[reset_type]));
359 }
360 if (reset_type == NONE)
361 reset_type = MIXED; /* by default */
362 if (reset_type != SOFT && (reset_type != MIXED || get_git_work_tree()))
364 setup_work_tree();
365 if (reset_type == MIXED && is_bare_repository())
367 die(_("%s reset is not allowed in a bare repository"),
368 _(reset_type_names[reset_type]));
369 if (intent_to_add && reset_type != MIXED)
371 die(_("-N can only be used with --mixed"));
372 /* Soft reset does not touch the index file nor the working tree
374 * at all, but requires them in a good order. Other resets reset
375 * the index file to the tree object we are switching to. */
376 if (reset_type == SOFT || reset_type == KEEP)
377 die_if_unmerged_cache(reset_type);
378 if (reset_type != SOFT) {
380 struct lock_file lock = LOCK_INIT;
381 hold_locked_index(&lock, LOCK_DIE_ON_ERROR);
382 if (reset_type == MIXED) {
383 int flags = quiet ? REFRESH_QUIET : REFRESH_IN_PORCELAIN;
384 if (read_from_tree(&pathspec, &oid, intent_to_add))
385 return 1;
386 if (get_git_work_tree())
387 refresh_index(&the_index, flags, NULL, NULL,
388 _("Unstaged changes after reset:"));
389 } else {
390 int err = reset_index(&oid, reset_type, quiet);
391 if (reset_type == KEEP && !err)
392 err = reset_index(&oid, MIXED, quiet);
393 if (err)
394 die(_("Could not reset index file to revision '%s'."), rev);
395 }
396 if (write_locked_index(&the_index, &lock, COMMIT_LOCK))
398 die(_("Could not write new index file."));
399 }
400 if (!pathspec.nr && !unborn) {
402 /* Any resets without paths update HEAD to the head being
403 * switched to, saving the previous head in ORIG_HEAD before. */
404 update_ref_status = reset_refs(rev, &oid);
405 if (reset_type == HARD && !update_ref_status && !quiet)
407 print_new_head_line(lookup_commit_reference(&oid));
408 }
409 if (!pathspec.nr)
410 remove_branch_state();
411 return update_ref_status;
413}