add: convert to use parse_pathspec
[git/git.git] / builtin / reset.c
CommitLineData
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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 */
c2e86add 10#include "builtin.h"
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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"
c369e7b8 19#include "branch.h"
5eee6b28 20#include "parse-options.h"
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21#include "unpack-trees.h"
22#include "cache-tree.h"
0e5a7faa 23
5eee6b28 24static const char * const git_reset_usage[] = {
c1e9c2a7 25 N_("git reset [--mixed | --soft | --hard | --merge | --keep] [-q] [<commit>]"),
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26 N_("git reset [-q] <tree-ish> [--] <paths>..."),
27 N_("git reset --patch [<tree-ish>] [--] [<paths>...]"),
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28 NULL
29};
0e5a7faa 30
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31enum reset_type { MIXED, SOFT, HARD, MERGE, KEEP, NONE };
32static const char *reset_type_names[] = {
8b2a57b6 33 N_("mixed"), N_("soft"), N_("hard"), N_("merge"), N_("keep"), NULL
9bc454df 34};
9e8eceab 35
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36static inline int is_merge(void)
37{
38 return !access(git_path("MERGE_HEAD"), F_OK);
39}
40
b7099a06 41static int reset_index(const unsigned char *sha1, int reset_type, int quiet)
0e5a7faa 42{
d0f379c2 43 int nr = 1;
d0f379c2 44 struct tree_desc desc[2];
6c52ec8a 45 struct tree *tree;
d0f379c2 46 struct unpack_trees_options opts;
0e5a7faa 47
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48 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;
5aa965a0 54 if (!quiet)
d0f379c2 55 opts.verbose_update = 1;
9e8eceab 56 switch (reset_type) {
9bc454df 57 case KEEP:
9e8eceab 58 case MERGE:
d0f379c2 59 opts.update = 1;
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60 break;
61 case HARD:
d0f379c2 62 opts.update = 1;
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63 /* fallthrough */
64 default:
d0f379c2 65 opts.reset = 1;
9e8eceab 66 }
0e5a7faa 67
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68 read_cache_unmerged();
69
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70 if (reset_type == KEEP) {
71 unsigned char head_sha1[20];
72 if (get_sha1("HEAD", head_sha1))
b50a64e8 73 return error(_("You do not have a valid HEAD."));
9bc454df 74 if (!fill_tree_descriptor(desc, head_sha1))
b50a64e8 75 return error(_("Failed to find tree of HEAD."));
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76 nr++;
77 opts.fn = twoway_merge;
78 }
79
d0f379c2 80 if (!fill_tree_descriptor(desc + nr - 1, sha1))
b50a64e8 81 return error(_("Failed to find tree of %s."), sha1_to_hex(sha1));
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82 if (unpack_trees(nr, desc, &opts))
83 return -1;
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84
85 if (reset_type == MIXED || reset_type == HARD) {
86 tree = parse_tree_indirect(sha1);
87 prime_cache_tree(&active_cache_tree, tree);
88 }
89
d0f379c2 90 return 0;
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91}
92
93static void print_new_head_line(struct commit *commit)
94{
2efb3b06 95 const char *hex, *body;
ecaee805 96 char *msg;
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97
98 hex = find_unique_abbrev(commit->object.sha1, DEFAULT_ABBREV);
b50a64e8 99 printf(_("HEAD is now at %s"), hex);
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100 msg = logmsg_reencode(commit, NULL, get_log_output_encoding());
101 body = strstr(msg, "\n\n");
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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");
ecaee805 112 logmsg_free(msg, commit);
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113}
114
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115static void update_index_from_diff(struct diff_queue_struct *q,
116 struct diff_options *opt, void *data)
117{
118 int i;
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119
120 for (i = 0; i < q->nr; i++) {
121 struct diff_filespec *one = q->queue[i]->one;
ff00b682 122 if (one->mode && !is_null_sha1(one->sha1)) {
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123 struct cache_entry *ce;
124 ce = make_cache_entry(one->mode, one->sha1, one->path,
125 0, 0);
d09e2cd5 126 if (!ce)
b50a64e8 127 die(_("make_cache_entry failed for path '%s'"),
d09e2cd5 128 one->path);
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129 add_cache_entry(ce, ADD_CACHE_OK_TO_ADD |
130 ADD_CACHE_OK_TO_REPLACE);
131 } else
132 remove_file_from_cache(one->path);
133 }
134}
135
bf883f30 136static int read_from_tree(const char **pathspec, unsigned char *tree_sha1)
0e5a7faa 137{
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138 struct diff_options opt;
139
140 memset(&opt, 0, sizeof(opt));
18648e89 141 diff_tree_setup_paths(pathspec, &opt);
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142 opt.output_format = DIFF_FORMAT_CALLBACK;
143 opt.format_callback = update_index_from_diff;
144
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145 read_cache();
146 if (do_diff_cache(tree_sha1, &opt))
147 return 1;
148 diffcore_std(&opt);
149 diff_flush(&opt);
03b69c76 150 diff_tree_release_paths(&opt);
2e7a9785 151
bf883f30 152 return 0;
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153}
154
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155static void set_reflog_message(struct strbuf *sb, const char *action,
156 const char *rev)
0e5a7faa 157{
0e5a7faa 158 const char *rla = getenv("GIT_REFLOG_ACTION");
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159
160 strbuf_reset(sb);
161 if (rla)
162 strbuf_addf(sb, "%s: %s", rla, action);
163 else if (rev)
164 strbuf_addf(sb, "reset: moving to %s", rev);
165 else
166 strbuf_addf(sb, "reset: %s", action);
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167}
168
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169static void die_if_unmerged_cache(int reset_type)
170{
171 if (is_merge() || read_cache() < 0 || unmerged_cache())
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172 die(_("Cannot do a %s reset in the middle of a merge."),
173 _(reset_type_names[reset_type]));
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174
175}
176
dca48cf5 177static const char **parse_args(const char **argv, const char *prefix, const char **rev_ret)
0e5a7faa 178{
0e5a7faa 179 const char *rev = "HEAD";
39ea722d 180 unsigned char unused[20];
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181 /*
182 * Possible arguments are:
183 *
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184 * git reset [-opts] [<rev>]
185 * git reset [-opts] <tree> [<paths>...]
186 * git reset [-opts] <tree> -- [<paths>...]
187 * git reset [-opts] -- [<paths>...]
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188 * git reset [-opts] <paths>...
189 *
dca48cf5 190 * At this point, argv points immediately after [-opts].
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191 */
192
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193 if (argv[0]) {
194 if (!strcmp(argv[0], "--")) {
195 argv++; /* reset to HEAD, possibly with paths */
196 } else if (argv[1] && !strcmp(argv[1], "--")) {
197 rev = argv[0];
198 argv += 2;
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199 }
200 /*
dca48cf5 201 * Otherwise, argv[0] could be either <rev> or <paths> and
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202 * has to be unambiguous. If there is a single argument, it
203 * can not be a tree
dfc8f39e 204 */
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205 else if ((!argv[1] && !get_sha1_committish(argv[0], unused)) ||
206 (argv[1] && !get_sha1_treeish(argv[0], unused))) {
dfc8f39e 207 /*
2f328c3d 208 * Ok, argv[0] looks like a commit/tree; it should not
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209 * be a filename.
210 */
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211 verify_non_filename(prefix, argv[0]);
212 rev = *argv++;
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213 } else {
214 /* Otherwise we treat this as a filename */
dca48cf5 215 verify_filename(prefix, argv[0], 1);
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216 }
217 }
39ea722d 218 *rev_ret = rev;
dca48cf5 219 return argv[0] ? get_pathspec(prefix, argv) : NULL;
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220}
221
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222static int update_refs(const char *rev, const unsigned char *sha1)
223{
224 int update_ref_status;
225 struct strbuf msg = STRBUF_INIT;
226 unsigned char *orig = NULL, sha1_orig[20],
227 *old_orig = NULL, sha1_old_orig[20];
228
229 if (!get_sha1("ORIG_HEAD", sha1_old_orig))
230 old_orig = sha1_old_orig;
231 if (!get_sha1("HEAD", sha1_orig)) {
232 orig = sha1_orig;
233 set_reflog_message(&msg, "updating ORIG_HEAD", NULL);
234 update_ref(msg.buf, "ORIG_HEAD", orig, old_orig, 0, MSG_ON_ERR);
235 } else if (old_orig)
236 delete_ref("ORIG_HEAD", old_orig, 0);
237 set_reflog_message(&msg, "updating HEAD", rev);
238 update_ref_status = update_ref(msg.buf, "HEAD", sha1, orig, 0, MSG_ON_ERR);
239 strbuf_release(&msg);
240 return update_ref_status;
241}
242
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243int cmd_reset(int argc, const char **argv, const char *prefix)
244{
245 int reset_type = NONE, update_ref_status = 0, quiet = 0;
166ec2e9 246 int patch_mode = 0, unborn;
39ea722d 247 const char *rev;
7bca0e45 248 unsigned char sha1[20];
39ea722d 249 const char **pathspec = NULL;
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250 const struct option options[] = {
251 OPT__QUIET(&quiet, N_("be quiet, only report errors")),
252 OPT_SET_INT(0, "mixed", &reset_type,
253 N_("reset HEAD and index"), MIXED),
254 OPT_SET_INT(0, "soft", &reset_type, N_("reset only HEAD"), SOFT),
255 OPT_SET_INT(0, "hard", &reset_type,
256 N_("reset HEAD, index and working tree"), HARD),
257 OPT_SET_INT(0, "merge", &reset_type,
258 N_("reset HEAD, index and working tree"), MERGE),
259 OPT_SET_INT(0, "keep", &reset_type,
260 N_("reset HEAD but keep local changes"), KEEP),
261 OPT_BOOLEAN('p', "patch", &patch_mode, N_("select hunks interactively")),
262 OPT_END()
263 };
264
265 git_config(git_default_config, NULL);
266
267 argc = parse_options(argc, argv, prefix, options, git_reset_usage,
268 PARSE_OPT_KEEP_DASHDASH);
dca48cf5 269 pathspec = parse_args(argv, prefix, &rev);
0e5a7faa 270
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271 unborn = !strcmp(rev, "HEAD") && get_sha1("HEAD", sha1);
272 if (unborn) {
273 /* reset on unborn branch: treat as reset to empty tree */
274 hashcpy(sha1, EMPTY_TREE_SHA1_BIN);
275 } else if (!pathspec) {
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276 struct commit *commit;
277 if (get_sha1_committish(rev, sha1))
278 die(_("Failed to resolve '%s' as a valid revision."), rev);
279 commit = lookup_commit_reference(sha1);
280 if (!commit)
281 die(_("Could not parse object '%s'."), rev);
282 hashcpy(sha1, commit->object.sha1);
283 } else {
284 struct tree *tree;
285 if (get_sha1_treeish(rev, sha1))
286 die(_("Failed to resolve '%s' as a valid tree."), rev);
287 tree = parse_tree_indirect(sha1);
288 if (!tree)
289 die(_("Could not parse object '%s'."), rev);
290 hashcpy(sha1, tree->object.sha1);
291 }
0e5a7faa 292
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293 if (patch_mode) {
294 if (reset_type != NONE)
b50a64e8 295 die(_("--patch is incompatible with --{hard,mixed,soft}"));
166ec2e9 296 return run_add_interactive(sha1_to_hex(sha1), "--patch=reset", pathspec);
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297 }
298
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299 /* git reset tree [--] paths... can be used to
300 * load chosen paths from the tree into the index without
301 * affecting the working tree nor HEAD. */
18648e89 302 if (pathspec) {
0e5a7faa 303 if (reset_type == MIXED)
b50a64e8 304 warning(_("--mixed with paths is deprecated; use 'git reset -- <paths>' instead."));
0e5a7faa 305 else if (reset_type != NONE)
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ÆAB
306 die(_("Cannot do %s reset with paths."),
307 _(reset_type_names[reset_type]));
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308 }
309 if (reset_type == NONE)
310 reset_type = MIXED; /* by default */
311
ab892a19 312 if (reset_type != SOFT && reset_type != MIXED)
cd0f0f68 313 setup_work_tree();
49b9362f 314
2b06b0a0 315 if (reset_type == MIXED && is_bare_repository())
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316 die(_("%s reset is not allowed in a bare repository"),
317 _(reset_type_names[reset_type]));
2b06b0a0 318
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319 /* Soft reset does not touch the index file nor the working tree
320 * at all, but requires them in a good order. Other resets reset
321 * the index file to the tree object we are switching to. */
352f58a5 322 if (reset_type == SOFT || reset_type == KEEP)
812d2a3d 323 die_if_unmerged_cache(reset_type);
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324
325 if (reset_type != SOFT) {
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326 struct lock_file *lock = xcalloc(1, sizeof(struct lock_file));
327 int newfd = hold_locked_index(lock, 1);
3fde386a 328 if (reset_type == MIXED) {
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MZ
329 if (read_from_tree(pathspec, sha1))
330 return 1;
331 } else {
332 int err = reset_index(sha1, reset_type, quiet);
333 if (reset_type == KEEP && !err)
334 err = reset_index(sha1, MIXED, quiet);
335 if (err)
336 die(_("Could not reset index file to revision '%s'."), rev);
337 }
bc41bf42 338
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MZ
339 if (reset_type == MIXED) { /* Report what has not been updated. */
340 int flags = quiet ? REFRESH_QUIET : REFRESH_IN_PORCELAIN;
341 refresh_index(&the_index, flags, NULL, NULL,
342 _("Unstaged changes after reset:"));
343 }
bc41bf42 344
1ca38f85
MZ
345 if (write_cache(newfd, active_cache, active_nr) ||
346 commit_locked_index(lock))
347 die(_("Could not write new index file."));
0e5a7faa 348 }
0e5a7faa 349
166ec2e9 350 if (!pathspec && !unborn) {
3bbf2f20
MZ
351 /* Any resets without paths update HEAD to the head being
352 * switched to, saving the previous head in ORIG_HEAD before. */
353 update_ref_status = update_refs(rev, sha1);
0e5a7faa 354
3bbf2f20 355 if (reset_type == HARD && !update_ref_status && !quiet)
2f328c3d 356 print_new_head_line(lookup_commit_reference(sha1));
3bbf2f20 357 }
166ec2e9
MZ
358 if (!pathspec)
359 remove_branch_state();
0e5a7faa 360
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CR
361 return update_ref_status;
362}