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
14 #include "run-command.h"
20 #include "parse-options.h"
21 #include "unpack-trees.h"
22 #include "cache-tree.h"
24 static const char * const git_reset_usage
[] = {
25 N_("git reset [--mixed | --soft | --hard | --merge | --keep] [-q] [<commit>]"),
26 N_("git reset [-q] <commit> [--] <paths>..."),
27 N_("git reset --patch [<commit>] [--] [<paths>...]"),
31 enum reset_type
{ MIXED
, SOFT
, HARD
, MERGE
, KEEP
, NONE
};
32 static const char *reset_type_names
[] = {
33 N_("mixed"), N_("soft"), N_("hard"), N_("merge"), N_("keep"), NULL
36 static inline int is_merge(void)
38 return !access(git_path("MERGE_HEAD"), F_OK
);
41 static int reset_index(const unsigned char *sha1
, int reset_type
, int quiet
)
44 struct tree_desc desc
[2];
46 struct unpack_trees_options opts
;
48 memset(&opts
, 0, sizeof(opts
));
50 opts
.src_index
= &the_index
;
51 opts
.dst_index
= &the_index
;
52 opts
.fn
= oneway_merge
;
55 opts
.verbose_update
= 1;
68 read_cache_unmerged();
70 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."));
77 opts
.fn
= twoway_merge
;
80 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
))
85 if (reset_type
== MIXED
|| reset_type
== HARD
) {
86 tree
= parse_tree_indirect(sha1
);
87 prime_cache_tree(&active_cache_tree
, tree
);
93 static void print_new_head_line(struct commit
*commit
)
95 const char *hex
, *body
;
97 hex
= find_unique_abbrev(commit
->object
.sha1
, DEFAULT_ABBREV
);
98 printf(_("HEAD is now at %s"), hex
);
99 body
= strstr(commit
->buffer
, "\n\n");
104 eol
= strchr(body
, '\n');
105 len
= eol
? eol
- body
: strlen(body
);
106 printf(" %.*s\n", (int) len
, body
);
112 static int update_index_refresh(int fd
, struct lock_file
*index_lock
, int flags
)
115 index_lock
= xcalloc(1, sizeof(struct lock_file
));
116 fd
= hold_locked_index(index_lock
, 1);
119 refresh_index(&the_index
, (flags
), NULL
, NULL
,
120 _("Unstaged changes after reset:"));
121 if (write_cache(fd
, active_cache
, active_nr
) ||
122 commit_locked_index(index_lock
))
123 return error ("Could not refresh index");
127 static void update_index_from_diff(struct diff_queue_struct
*q
,
128 struct diff_options
*opt
, void *data
)
132 for (i
= 0; i
< q
->nr
; i
++) {
133 struct diff_filespec
*one
= q
->queue
[i
]->one
;
134 if (one
->mode
&& !is_null_sha1(one
->sha1
)) {
135 struct cache_entry
*ce
;
136 ce
= make_cache_entry(one
->mode
, one
->sha1
, one
->path
,
139 die(_("make_cache_entry failed for path '%s'"),
141 add_cache_entry(ce
, ADD_CACHE_OK_TO_ADD
|
142 ADD_CACHE_OK_TO_REPLACE
);
144 remove_file_from_cache(one
->path
);
148 static int read_from_tree(const char **pathspec
, unsigned char *tree_sha1
)
150 struct diff_options opt
;
152 memset(&opt
, 0, sizeof(opt
));
153 diff_tree_setup_paths(pathspec
, &opt
);
154 opt
.output_format
= DIFF_FORMAT_CALLBACK
;
155 opt
.format_callback
= update_index_from_diff
;
158 if (do_diff_cache(tree_sha1
, &opt
))
162 diff_tree_release_paths(&opt
);
167 static void set_reflog_message(struct strbuf
*sb
, const char *action
,
170 const char *rla
= getenv("GIT_REFLOG_ACTION");
174 strbuf_addf(sb
, "%s: %s", rla
, action
);
176 strbuf_addf(sb
, "reset: moving to %s", rev
);
178 strbuf_addf(sb
, "reset: %s", action
);
181 static void die_if_unmerged_cache(int reset_type
)
183 if (is_merge() || read_cache() < 0 || unmerged_cache())
184 die(_("Cannot do a %s reset in the middle of a merge."),
185 _(reset_type_names
[reset_type
]));
189 static const char **parse_args(const char **argv
, const char *prefix
, const char **rev_ret
)
191 const char *rev
= "HEAD";
192 unsigned char unused
[20];
194 * Possible arguments are:
196 * git reset [-opts] <rev> <paths>...
197 * git reset [-opts] <rev> -- <paths>...
198 * git reset [-opts] -- <paths>...
199 * git reset [-opts] <paths>...
201 * At this point, argv points immediately after [-opts].
205 if (!strcmp(argv
[0], "--")) {
206 argv
++; /* reset to HEAD, possibly with paths */
207 } else if (argv
[1] && !strcmp(argv
[1], "--")) {
212 * Otherwise, argv[0] could be either <rev> or <paths> and
213 * has to be unambiguous.
215 else if (!get_sha1_committish(argv
[0], unused
)) {
217 * Ok, argv[0] looks like a rev; it should not
220 verify_non_filename(prefix
, argv
[0]);
223 /* Otherwise we treat this as a filename */
224 verify_filename(prefix
, argv
[0], 1);
228 return argv
[0] ? get_pathspec(prefix
, argv
) : NULL
;
231 static int update_refs(const char *rev
, const unsigned char *sha1
)
233 int update_ref_status
;
234 struct strbuf msg
= STRBUF_INIT
;
235 unsigned char *orig
= NULL
, sha1_orig
[20],
236 *old_orig
= NULL
, sha1_old_orig
[20];
238 if (!get_sha1("ORIG_HEAD", sha1_old_orig
))
239 old_orig
= sha1_old_orig
;
240 if (!get_sha1("HEAD", sha1_orig
)) {
242 set_reflog_message(&msg
, "updating ORIG_HEAD", NULL
);
243 update_ref(msg
.buf
, "ORIG_HEAD", orig
, old_orig
, 0, MSG_ON_ERR
);
245 delete_ref("ORIG_HEAD", old_orig
, 0);
246 set_reflog_message(&msg
, "updating HEAD", rev
);
247 update_ref_status
= update_ref(msg
.buf
, "HEAD", sha1
, orig
, 0, MSG_ON_ERR
);
248 strbuf_release(&msg
);
249 return update_ref_status
;
252 int cmd_reset(int argc
, const char **argv
, const char *prefix
)
254 int reset_type
= NONE
, update_ref_status
= 0, quiet
= 0;
257 unsigned char sha1
[20];
258 const char **pathspec
= NULL
;
259 struct commit
*commit
;
260 const struct option options
[] = {
261 OPT__QUIET(&quiet
, N_("be quiet, only report errors")),
262 OPT_SET_INT(0, "mixed", &reset_type
,
263 N_("reset HEAD and index"), MIXED
),
264 OPT_SET_INT(0, "soft", &reset_type
, N_("reset only HEAD"), SOFT
),
265 OPT_SET_INT(0, "hard", &reset_type
,
266 N_("reset HEAD, index and working tree"), HARD
),
267 OPT_SET_INT(0, "merge", &reset_type
,
268 N_("reset HEAD, index and working tree"), MERGE
),
269 OPT_SET_INT(0, "keep", &reset_type
,
270 N_("reset HEAD but keep local changes"), KEEP
),
271 OPT_BOOLEAN('p', "patch", &patch_mode
, N_("select hunks interactively")),
275 git_config(git_default_config
, NULL
);
277 argc
= parse_options(argc
, argv
, prefix
, options
, git_reset_usage
,
278 PARSE_OPT_KEEP_DASHDASH
);
279 pathspec
= parse_args(argv
, prefix
, &rev
);
281 if (get_sha1_committish(rev
, sha1
))
282 die(_("Failed to resolve '%s' as a valid ref."), rev
);
285 * NOTE: As "git reset $treeish -- $path" should be usable on
286 * any tree-ish, this is not strictly correct. We are not
287 * moving the HEAD to any commit; we are merely resetting the
288 * entries in the index to that of a treeish.
290 commit
= lookup_commit_reference(sha1
);
292 die(_("Could not parse object '%s'."), rev
);
293 hashcpy(sha1
, commit
->object
.sha1
);
296 if (reset_type
!= NONE
)
297 die(_("--patch is incompatible with --{hard,mixed,soft}"));
298 return run_add_interactive(rev
, "--patch=reset", pathspec
);
301 /* git reset tree [--] paths... can be used to
302 * load chosen paths from the tree into the index without
303 * affecting the working tree nor HEAD. */
305 if (reset_type
== MIXED
)
306 warning(_("--mixed with paths is deprecated; use 'git reset -- <paths>' instead."));
307 else if (reset_type
!= NONE
)
308 die(_("Cannot do %s reset with paths."),
309 _(reset_type_names
[reset_type
]));
311 if (reset_type
== NONE
)
312 reset_type
= MIXED
; /* by default */
314 if (reset_type
!= SOFT
&& reset_type
!= MIXED
)
317 if (reset_type
== MIXED
&& is_bare_repository())
318 die(_("%s reset is not allowed in a bare repository"),
319 _(reset_type_names
[reset_type
]));
322 struct lock_file
*lock
= xcalloc(1, sizeof(struct lock_file
));
323 int index_fd
= hold_locked_index(lock
, 1);
324 return read_from_tree(pathspec
, sha1
) ||
325 update_index_refresh(index_fd
, lock
,
326 quiet
? REFRESH_QUIET
: REFRESH_IN_PORCELAIN
);
329 /* Soft reset does not touch the index file nor the working tree
330 * at all, but requires them in a good order. Other resets reset
331 * the index file to the tree object we are switching to. */
332 if (reset_type
== SOFT
|| reset_type
== KEEP
)
333 die_if_unmerged_cache(reset_type
);
335 if (reset_type
!= SOFT
) {
336 struct lock_file
*lock
= xcalloc(1, sizeof(struct lock_file
));
337 int newfd
= hold_locked_index(lock
, 1);
338 int err
= reset_index(sha1
, reset_type
, quiet
);
339 if (reset_type
== KEEP
&& !err
)
340 err
= reset_index(sha1
, MIXED
, quiet
);
342 die(_("Could not reset index file to revision '%s'."), rev
);
343 if (write_cache(newfd
, active_cache
, active_nr
) ||
344 commit_locked_index(lock
))
345 die(_("Could not write new index file."));
348 /* Any resets update HEAD to the head being switched to,
349 * saving the previous head in ORIG_HEAD before. */
350 update_ref_status
= update_refs(rev
, sha1
);
352 if (reset_type
== HARD
&& !update_ref_status
&& !quiet
)
353 print_new_head_line(commit
);
354 else if (reset_type
== MIXED
) /* Report what has not been updated. */
355 update_index_refresh(0, NULL
,
356 quiet
? REFRESH_QUIET
: REFRESH_IN_PORCELAIN
);
358 remove_branch_state();
360 return update_ref_status
;