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 "tag.h"
12#include "object.h"
13#include "commit.h"
14#include "run-command.h"
15#include "refs.h"
16#include "diff.h"
17#include "diffcore.h"
18#include "tree.h"
19#include "branch.h"
20#include "parse-options.h"
21#include "unpack-trees.h"
22#include "cache-tree.h"
23static const char * const git_reset_usage[] = {
25 N_("git reset [--mixed | --soft | --hard | --merge | --keep] [-q] [<commit>]"),
26 N_("git reset [-q] <tree-ish> [--] <paths>..."),
27 N_("git reset --patch [<tree-ish>] [--] [<paths>...]"),
28 NULL
29};
30enum reset_type { MIXED, SOFT, HARD, MERGE, KEEP, NONE };
32static const char *reset_type_names[] = {
33 N_("mixed"), N_("soft"), N_("hard"), N_("merge"), N_("keep"), NULL
34};
35static inline int is_merge(void)
37{
38 return !access(git_path("MERGE_HEAD"), F_OK);
39}
40static int reset_index(const unsigned char *sha1, int reset_type, int quiet)
42{
43 int nr = 1;
44 struct tree_desc desc[2];
45 struct tree *tree;
46 struct unpack_trees_options opts;
47 memset(&opts, 0, sizeof(opts));
49 opts.head_idx = 1;
50 opts.src_index = &the_index;
51 opts.dst_index = &the_index;
52 opts.fn = oneway_merge;
53 opts.merge = 1;
54 if (!quiet)
55 opts.verbose_update = 1;
56 switch (reset_type) {
57 case KEEP:
58 case MERGE:
59 opts.update = 1;
60 break;
61 case HARD:
62 opts.update = 1;
63 /* fallthrough */
64 default:
65 opts.reset = 1;
66 }
67 read_cache_unmerged();
69 if (reset_type == KEEP) {
71 unsigned char head_sha1[20];
72 if (get_sha1("HEAD", head_sha1))
73 return error(_("You do not have a valid HEAD."));
74 if (!fill_tree_descriptor(desc, head_sha1))
75 return error(_("Failed to find tree of HEAD."));
76 nr++;
77 opts.fn = twoway_merge;
78 }
79 if (!fill_tree_descriptor(desc + nr - 1, sha1))
81 return error(_("Failed to find tree of %s."), sha1_to_hex(sha1));
82 if (unpack_trees(nr, desc, &opts))
83 return -1;
84 if (reset_type == MIXED || reset_type == HARD) {
86 tree = parse_tree_indirect(sha1);
87 prime_cache_tree(&active_cache_tree, tree);
88 }
89 return 0;
91}
92static void print_new_head_line(struct commit *commit)
94{
95 const char *hex, *body;
96 const char *msg;
97 hex = find_unique_abbrev(commit->object.sha1, DEFAULT_ABBREV);
99 printf(_("HEAD is now at %s"), hex);
100 msg = logmsg_reencode(commit, NULL, get_log_output_encoding());
101 body = strstr(msg, "\n\n");
102 if (body) {
103 const char *eol;
104 size_t len;
105 body += 2;
106 eol = strchr(body, '\n');
107 len = eol ? eol - body : strlen(body);
108 printf(" %.*s\n", (int) len, body);
109 }
110 else
111 printf("\n");
112 unuse_commit_buffer(commit, msg);
113}
114static void update_index_from_diff(struct diff_queue_struct *q,
116 struct diff_options *opt, void *data)
117{
118 int i;
119 int intent_to_add = *(int *)data;
120 for (i = 0; i < q->nr; i++) {
122 struct diff_filespec *one = q->queue[i]->one;
123 int is_missing = !(one->mode && !is_null_sha1(one->sha1));
124 struct cache_entry *ce;
125 if (is_missing && !intent_to_add) {
127 remove_file_from_cache(one->path);
128 continue;
129 }
130 ce = make_cache_entry(one->mode, one->sha1, one->path,
132 0, 0);
133 if (!ce)
134 die(_("make_cache_entry failed for path '%s'"),
135 one->path);
136 if (is_missing) {
137 ce->ce_flags |= CE_INTENT_TO_ADD;
138 set_object_name_for_intent_to_add_entry(ce);
139 }
140 add_cache_entry(ce, ADD_CACHE_OK_TO_ADD | ADD_CACHE_OK_TO_REPLACE);
141 }
142}
143static int read_from_tree(const struct pathspec *pathspec,
145 unsigned char *tree_sha1,
146 int intent_to_add)
147{
148 struct diff_options opt;
149 memset(&opt, 0, sizeof(opt));
151 copy_pathspec(&opt.pathspec, pathspec);
152 opt.output_format = DIFF_FORMAT_CALLBACK;
153 opt.format_callback = update_index_from_diff;
154 opt.format_callback_data = &intent_to_add;
155 if (do_diff_cache(tree_sha1, &opt))
157 return 1;
158 diffcore_std(&opt);
159 diff_flush(&opt);
160 free_pathspec(&opt.pathspec);
161 return 0;
163}
164static void set_reflog_message(struct strbuf *sb, const char *action,
166 const char *rev)
167{
168 const char *rla = getenv("GIT_REFLOG_ACTION");
169 strbuf_reset(sb);
171 if (rla)
172 strbuf_addf(sb, "%s: %s", rla, action);
173 else if (rev)
174 strbuf_addf(sb, "reset: moving to %s", rev);
175 else
176 strbuf_addf(sb, "reset: %s", action);
177}
178static void die_if_unmerged_cache(int reset_type)
180{
181 if (is_merge() || unmerged_cache())
182 die(_("Cannot do a %s reset in the middle of a merge."),
183 _(reset_type_names[reset_type]));
184}
186static void parse_args(struct pathspec *pathspec,
188 const char **argv, const char *prefix,
189 int patch_mode,
190 const char **rev_ret)
191{
192 const char *rev = "HEAD";
193 unsigned char unused[20];
194 /*
195 * Possible arguments are:
196 *
197 * git reset [-opts] [<rev>]
198 * git reset [-opts] <tree> [<paths>...]
199 * git reset [-opts] <tree> -- [<paths>...]
200 * git reset [-opts] -- [<paths>...]
201 * git reset [-opts] <paths>...
202 *
203 * At this point, argv points immediately after [-opts].
204 */
205 if (argv[0]) {
207 if (!strcmp(argv[0], "--")) {
208 argv++; /* reset to HEAD, possibly with paths */
209 } else if (argv[1] && !strcmp(argv[1], "--")) {
210 rev = argv[0];
211 argv += 2;
212 }
213 /*
214 * Otherwise, argv[0] could be either <rev> or <paths> and
215 * has to be unambiguous. If there is a single argument, it
216 * can not be a tree
217 */
218 else if ((!argv[1] && !get_sha1_committish(argv[0], unused)) ||
219 (argv[1] && !get_sha1_treeish(argv[0], unused))) {
220 /*
221 * Ok, argv[0] looks like a commit/tree; it should not
222 * be a filename.
223 */
224 verify_non_filename(prefix, argv[0]);
225 rev = *argv++;
226 } else {
227 /* Otherwise we treat this as a filename */
228 verify_filename(prefix, argv[0], 1);
229 }
230 }
231 *rev_ret = rev;
232 if (read_cache() < 0)
234 die(_("index file corrupt"));
235 parse_pathspec(pathspec, 0,
237 PATHSPEC_PREFER_FULL |
238 PATHSPEC_STRIP_SUBMODULE_SLASH_CHEAP |
239 (patch_mode ? PATHSPEC_PREFIX_ORIGIN : 0),
240 prefix, argv);
241}
242static int reset_refs(const char *rev, const unsigned char *sha1)
244{
245 int update_ref_status;
246 struct strbuf msg = STRBUF_INIT;
247 unsigned char *orig = NULL, sha1_orig[20],
248 *old_orig = NULL, sha1_old_orig[20];
249 if (!get_sha1("ORIG_HEAD", sha1_old_orig))
251 old_orig = sha1_old_orig;
252 if (!get_sha1("HEAD", sha1_orig)) {
253 orig = sha1_orig;
254 set_reflog_message(&msg, "updating ORIG_HEAD", NULL);
255 update_ref(msg.buf, "ORIG_HEAD", orig, old_orig, 0,
256 UPDATE_REFS_MSG_ON_ERR);
257 } else if (old_orig)
258 delete_ref("ORIG_HEAD", old_orig, 0);
259 set_reflog_message(&msg, "updating HEAD", rev);
260 update_ref_status = update_ref(msg.buf, "HEAD", sha1, orig, 0,
261 UPDATE_REFS_MSG_ON_ERR);
262 strbuf_release(&msg);
263 return update_ref_status;
264}
265int cmd_reset(int argc, const char **argv, const char *prefix)
267{
268 int reset_type = NONE, update_ref_status = 0, quiet = 0;
269 int patch_mode = 0, unborn;
270 const char *rev;
271 unsigned char sha1[20];
272 struct pathspec pathspec;
273 int intent_to_add = 0;
274 const struct option options[] = {
275 OPT__QUIET(&quiet, N_("be quiet, only report errors")),
276 OPT_SET_INT(0, "mixed", &reset_type,
277 N_("reset HEAD and index"), MIXED),
278 OPT_SET_INT(0, "soft", &reset_type, N_("reset only HEAD"), SOFT),
279 OPT_SET_INT(0, "hard", &reset_type,
280 N_("reset HEAD, index and working tree"), HARD),
281 OPT_SET_INT(0, "merge", &reset_type,
282 N_("reset HEAD, index and working tree"), MERGE),
283 OPT_SET_INT(0, "keep", &reset_type,
284 N_("reset HEAD but keep local changes"), KEEP),
285 OPT_BOOL('p', "patch", &patch_mode, N_("select hunks interactively")),
286 OPT_BOOL('N', "intent-to-add", &intent_to_add,
287 N_("record only the fact that removed paths will be added later")),
288 OPT_END()
289 };
290 git_config(git_default_config, NULL);
292 argc = parse_options(argc, argv, prefix, options, git_reset_usage,
294 PARSE_OPT_KEEP_DASHDASH);
295 parse_args(&pathspec, argv, prefix, patch_mode, &rev);
296 unborn = !strcmp(rev, "HEAD") && get_sha1("HEAD", sha1);
298 if (unborn) {
299 /* reset on unborn branch: treat as reset to empty tree */
300 hashcpy(sha1, EMPTY_TREE_SHA1_BIN);
301 } else if (!pathspec.nr) {
302 struct commit *commit;
303 if (get_sha1_committish(rev, sha1))
304 die(_("Failed to resolve '%s' as a valid revision."), rev);
305 commit = lookup_commit_reference(sha1);
306 if (!commit)
307 die(_("Could not parse object '%s'."), rev);
308 hashcpy(sha1, commit->object.sha1);
309 } else {
310 struct tree *tree;
311 if (get_sha1_treeish(rev, sha1))
312 die(_("Failed to resolve '%s' as a valid tree."), rev);
313 tree = parse_tree_indirect(sha1);
314 if (!tree)
315 die(_("Could not parse object '%s'."), rev);
316 hashcpy(sha1, tree->object.sha1);
317 }
318 if (patch_mode) {
320 if (reset_type != NONE)
321 die(_("--patch is incompatible with --{hard,mixed,soft}"));
322 return run_add_interactive(rev, "--patch=reset", &pathspec);
323 }
324 /* git reset tree [--] paths... can be used to
326 * load chosen paths from the tree into the index without
327 * affecting the working tree nor HEAD. */
328 if (pathspec.nr) {
329 if (reset_type == MIXED)
330 warning(_("--mixed with paths is deprecated; use 'git reset -- <paths>' instead."));
331 else if (reset_type != NONE)
332 die(_("Cannot do %s reset with paths."),
333 _(reset_type_names[reset_type]));
334 }
335 if (reset_type == NONE)
336 reset_type = MIXED; /* by default */
337 if (reset_type != SOFT && (reset_type != MIXED || get_git_work_tree()))
339 setup_work_tree();
340 if (reset_type == MIXED && is_bare_repository())
342 die(_("%s reset is not allowed in a bare repository"),
343 _(reset_type_names[reset_type]));
344 if (intent_to_add && reset_type != MIXED)
346 die(_("-N can only be used with --mixed"));
347 /* Soft reset does not touch the index file nor the working tree
349 * at all, but requires them in a good order. Other resets reset
350 * the index file to the tree object we are switching to. */
351 if (reset_type == SOFT || reset_type == KEEP)
352 die_if_unmerged_cache(reset_type);
353 if (reset_type != SOFT) {
355 struct lock_file *lock = xcalloc(1, sizeof(*lock));
356 int newfd = hold_locked_index(lock, 1);
357 if (reset_type == MIXED) {
358 int flags = quiet ? REFRESH_QUIET : REFRESH_IN_PORCELAIN;
359 if (read_from_tree(&pathspec, sha1, intent_to_add))
360 return 1;
361 if (get_git_work_tree())
362 refresh_index(&the_index, flags, NULL, NULL,
363 _("Unstaged changes after reset:"));
364 } else {
365 int err = reset_index(sha1, reset_type, quiet);
366 if (reset_type == KEEP && !err)
367 err = reset_index(sha1, MIXED, quiet);
368 if (err)
369 die(_("Could not reset index file to revision '%s'."), rev);
370 }
371 if (write_cache(newfd, active_cache, active_nr) ||
373 commit_locked_index(lock))
374 die(_("Could not write new index file."));
375 }
376 if (!pathspec.nr && !unborn) {
378 /* Any resets without paths update HEAD to the head being
379 * switched to, saving the previous head in ORIG_HEAD before. */
380 update_ref_status = reset_refs(rev, sha1);
381 if (reset_type == HARD && !update_ref_status && !quiet)
383 print_new_head_line(lookup_commit_reference(sha1));
384 }
385 if (!pathspec.nr)
386 remove_branch_state();
387 return update_ref_status;
389}