Merge branch 'jk/trace-fixup'
[git] / builtin / rm.c
1 /*
2  * "git rm" builtin command
3  *
4  * Copyright (C) Linus Torvalds 2006
5  */
6 #include "builtin.h"
7 #include "lockfile.h"
8 #include "dir.h"
9 #include "cache-tree.h"
10 #include "tree-walk.h"
11 #include "parse-options.h"
12 #include "string-list.h"
13 #include "submodule.h"
14 #include "pathspec.h"
15
16 static const char * const builtin_rm_usage[] = {
17         N_("git rm [<options>] [--] <file>..."),
18         NULL
19 };
20
21 static struct {
22         int nr, alloc;
23         struct {
24                 const char *name;
25                 char is_submodule;
26         } *entry;
27 } list;
28
29 static int get_ours_cache_pos(const char *path, int pos)
30 {
31         int i = -pos - 1;
32
33         while ((i < active_nr) && !strcmp(active_cache[i]->name, path)) {
34                 if (ce_stage(active_cache[i]) == 2)
35                         return i;
36                 i++;
37         }
38         return -1;
39 }
40
41 static void print_error_files(struct string_list *files_list,
42                               const char *main_msg,
43                               const char *hints_msg,
44                               int *errs)
45 {
46         if (files_list->nr) {
47                 int i;
48                 struct strbuf err_msg = STRBUF_INIT;
49
50                 strbuf_addstr(&err_msg, main_msg);
51                 for (i = 0; i < files_list->nr; i++)
52                         strbuf_addf(&err_msg,
53                                     "\n    %s",
54                                     files_list->items[i].string);
55                 if (advice_rm_hints)
56                         strbuf_addstr(&err_msg, hints_msg);
57                 *errs = error("%s", err_msg.buf);
58                 strbuf_release(&err_msg);
59         }
60 }
61
62 static void error_removing_concrete_submodules(struct string_list *files, int *errs)
63 {
64         print_error_files(files,
65                           Q_("the following submodule (or one of its nested "
66                              "submodules)\n"
67                              "uses a .git directory:",
68                              "the following submodules (or one of their nested "
69                              "submodules)\n"
70                              "use a .git directory:", files->nr),
71                           _("\n(use 'rm -rf' if you really want to remove "
72                             "it including all of its history)"),
73                           errs);
74         string_list_clear(files, 0);
75 }
76
77 static int check_submodules_use_gitfiles(void)
78 {
79         int i;
80         int errs = 0;
81         struct string_list files = STRING_LIST_INIT_NODUP;
82
83         for (i = 0; i < list.nr; i++) {
84                 const char *name = list.entry[i].name;
85                 int pos;
86                 const struct cache_entry *ce;
87
88                 pos = cache_name_pos(name, strlen(name));
89                 if (pos < 0) {
90                         pos = get_ours_cache_pos(name, pos);
91                         if (pos < 0)
92                                 continue;
93                 }
94                 ce = active_cache[pos];
95
96                 if (!S_ISGITLINK(ce->ce_mode) ||
97                     !file_exists(ce->name) ||
98                     is_empty_dir(name))
99                         continue;
100
101                 if (!submodule_uses_gitfile(name))
102                         string_list_append(&files, name);
103         }
104
105         error_removing_concrete_submodules(&files, &errs);
106
107         return errs;
108 }
109
110 static int check_local_mod(unsigned char *head, int index_only)
111 {
112         /*
113          * Items in list are already sorted in the cache order,
114          * so we could do this a lot more efficiently by using
115          * tree_desc based traversal if we wanted to, but I am
116          * lazy, and who cares if removal of files is a tad
117          * slower than the theoretical maximum speed?
118          */
119         int i, no_head;
120         int errs = 0;
121         struct string_list files_staged = STRING_LIST_INIT_NODUP;
122         struct string_list files_cached = STRING_LIST_INIT_NODUP;
123         struct string_list files_submodule = STRING_LIST_INIT_NODUP;
124         struct string_list files_local = STRING_LIST_INIT_NODUP;
125
126         no_head = is_null_sha1(head);
127         for (i = 0; i < list.nr; i++) {
128                 struct stat st;
129                 int pos;
130                 const struct cache_entry *ce;
131                 const char *name = list.entry[i].name;
132                 unsigned char sha1[20];
133                 unsigned mode;
134                 int local_changes = 0;
135                 int staged_changes = 0;
136
137                 pos = cache_name_pos(name, strlen(name));
138                 if (pos < 0) {
139                         /*
140                          * Skip unmerged entries except for populated submodules
141                          * that could lose history when removed.
142                          */
143                         pos = get_ours_cache_pos(name, pos);
144                         if (pos < 0)
145                                 continue;
146
147                         if (!S_ISGITLINK(active_cache[pos]->ce_mode) ||
148                             is_empty_dir(name))
149                                 continue;
150                 }
151                 ce = active_cache[pos];
152
153                 if (lstat(ce->name, &st) < 0) {
154                         if (errno != ENOENT && errno != ENOTDIR)
155                                 warning_errno(_("failed to stat '%s'"), ce->name);
156                         /* It already vanished from the working tree */
157                         continue;
158                 }
159                 else if (S_ISDIR(st.st_mode)) {
160                         /* if a file was removed and it is now a
161                          * directory, that is the same as ENOENT as
162                          * far as git is concerned; we do not track
163                          * directories unless they are submodules.
164                          */
165                         if (!S_ISGITLINK(ce->ce_mode))
166                                 continue;
167                 }
168
169                 /*
170                  * "rm" of a path that has changes need to be treated
171                  * carefully not to allow losing local changes
172                  * accidentally.  A local change could be (1) file in
173                  * work tree is different since the index; and/or (2)
174                  * the user staged a content that is different from
175                  * the current commit in the index.
176                  *
177                  * In such a case, you would need to --force the
178                  * removal.  However, "rm --cached" (remove only from
179                  * the index) is safe if the index matches the file in
180                  * the work tree or the HEAD commit, as it means that
181                  * the content being removed is available elsewhere.
182                  */
183
184                 /*
185                  * Is the index different from the file in the work tree?
186                  * If it's a submodule, is its work tree modified?
187                  */
188                 if (ce_match_stat(ce, &st, 0) ||
189                     (S_ISGITLINK(ce->ce_mode) &&
190                      !ok_to_remove_submodule(ce->name)))
191                         local_changes = 1;
192
193                 /*
194                  * Is the index different from the HEAD commit?  By
195                  * definition, before the very initial commit,
196                  * anything staged in the index is treated by the same
197                  * way as changed from the HEAD.
198                  */
199                 if (no_head
200                      || get_tree_entry(head, name, sha1, &mode)
201                      || ce->ce_mode != create_ce_mode(mode)
202                      || hashcmp(ce->sha1, sha1))
203                         staged_changes = 1;
204
205                 /*
206                  * If the index does not match the file in the work
207                  * tree and if it does not match the HEAD commit
208                  * either, (1) "git rm" without --cached definitely
209                  * will lose information; (2) "git rm --cached" will
210                  * lose information unless it is about removing an
211                  * "intent to add" entry.
212                  */
213                 if (local_changes && staged_changes) {
214                         if (!index_only || !ce_intent_to_add(ce))
215                                 string_list_append(&files_staged, name);
216                 }
217                 else if (!index_only) {
218                         if (staged_changes)
219                                 string_list_append(&files_cached, name);
220                         if (local_changes) {
221                                 if (S_ISGITLINK(ce->ce_mode) &&
222                                     !submodule_uses_gitfile(name))
223                                         string_list_append(&files_submodule, name);
224                                 else
225                                         string_list_append(&files_local, name);
226                         }
227                 }
228         }
229         print_error_files(&files_staged,
230                           Q_("the following file has staged content different "
231                              "from both the\nfile and the HEAD:",
232                              "the following files have staged content different"
233                              " from both the\nfile and the HEAD:",
234                              files_staged.nr),
235                           _("\n(use -f to force removal)"),
236                           &errs);
237         string_list_clear(&files_staged, 0);
238         print_error_files(&files_cached,
239                           Q_("the following file has changes "
240                              "staged in the index:",
241                              "the following files have changes "
242                              "staged in the index:", files_cached.nr),
243                           _("\n(use --cached to keep the file,"
244                             " or -f to force removal)"),
245                           &errs);
246         string_list_clear(&files_cached, 0);
247
248         error_removing_concrete_submodules(&files_submodule, &errs);
249
250         print_error_files(&files_local,
251                           Q_("the following file has local modifications:",
252                              "the following files have local modifications:",
253                              files_local.nr),
254                           _("\n(use --cached to keep the file,"
255                             " or -f to force removal)"),
256                           &errs);
257         string_list_clear(&files_local, 0);
258
259         return errs;
260 }
261
262 static struct lock_file lock_file;
263
264 static int show_only = 0, force = 0, index_only = 0, recursive = 0, quiet = 0;
265 static int ignore_unmatch = 0;
266
267 static struct option builtin_rm_options[] = {
268         OPT__DRY_RUN(&show_only, N_("dry run")),
269         OPT__QUIET(&quiet, N_("do not list removed files")),
270         OPT_BOOL( 0 , "cached",         &index_only, N_("only remove from the index")),
271         OPT__FORCE(&force, N_("override the up-to-date check")),
272         OPT_BOOL('r', NULL,             &recursive,  N_("allow recursive removal")),
273         OPT_BOOL( 0 , "ignore-unmatch", &ignore_unmatch,
274                                 N_("exit with a zero status even if nothing matched")),
275         OPT_END(),
276 };
277
278 int cmd_rm(int argc, const char **argv, const char *prefix)
279 {
280         int i;
281         struct pathspec pathspec;
282         char *seen;
283
284         gitmodules_config();
285         git_config(git_default_config, NULL);
286
287         argc = parse_options(argc, argv, prefix, builtin_rm_options,
288                              builtin_rm_usage, 0);
289         if (!argc)
290                 usage_with_options(builtin_rm_usage, builtin_rm_options);
291
292         if (!index_only)
293                 setup_work_tree();
294
295         hold_locked_index(&lock_file, 1);
296
297         if (read_cache() < 0)
298                 die(_("index file corrupt"));
299
300         parse_pathspec(&pathspec, 0,
301                        PATHSPEC_PREFER_CWD |
302                        PATHSPEC_STRIP_SUBMODULE_SLASH_CHEAP,
303                        prefix, argv);
304         refresh_index(&the_index, REFRESH_QUIET, &pathspec, NULL, NULL);
305
306         seen = xcalloc(pathspec.nr, 1);
307
308         for (i = 0; i < active_nr; i++) {
309                 const struct cache_entry *ce = active_cache[i];
310                 if (!ce_path_match(ce, &pathspec, seen))
311                         continue;
312                 ALLOC_GROW(list.entry, list.nr + 1, list.alloc);
313                 list.entry[list.nr].name = xstrdup(ce->name);
314                 list.entry[list.nr].is_submodule = S_ISGITLINK(ce->ce_mode);
315                 if (list.entry[list.nr++].is_submodule &&
316                     !is_staging_gitmodules_ok())
317                         die (_("Please stage your changes to .gitmodules or stash them to proceed"));
318         }
319
320         if (pathspec.nr) {
321                 const char *original;
322                 int seen_any = 0;
323                 for (i = 0; i < pathspec.nr; i++) {
324                         original = pathspec.items[i].original;
325                         if (!seen[i]) {
326                                 if (!ignore_unmatch) {
327                                         die(_("pathspec '%s' did not match any files"),
328                                             original);
329                                 }
330                         }
331                         else {
332                                 seen_any = 1;
333                         }
334                         if (!recursive && seen[i] == MATCHED_RECURSIVELY)
335                                 die(_("not removing '%s' recursively without -r"),
336                                     *original ? original : ".");
337                 }
338
339                 if (!seen_any)
340                         exit(0);
341         }
342
343         /*
344          * If not forced, the file, the index and the HEAD (if exists)
345          * must match; but the file can already been removed, since
346          * this sequence is a natural "novice" way:
347          *
348          *      rm F; git rm F
349          *
350          * Further, if HEAD commit exists, "diff-index --cached" must
351          * report no changes unless forced.
352          */
353         if (!force) {
354                 unsigned char sha1[20];
355                 if (get_sha1("HEAD", sha1))
356                         hashclr(sha1);
357                 if (check_local_mod(sha1, index_only))
358                         exit(1);
359         } else if (!index_only) {
360                 if (check_submodules_use_gitfiles())
361                         exit(1);
362         }
363
364         /*
365          * First remove the names from the index: we won't commit
366          * the index unless all of them succeed.
367          */
368         for (i = 0; i < list.nr; i++) {
369                 const char *path = list.entry[i].name;
370                 if (!quiet)
371                         printf("rm '%s'\n", path);
372
373                 if (remove_file_from_cache(path))
374                         die(_("git rm: unable to remove %s"), path);
375         }
376
377         if (show_only)
378                 return 0;
379
380         /*
381          * Then, unless we used "--cached", remove the filenames from
382          * the workspace. If we fail to remove the first one, we
383          * abort the "git rm" (but once we've successfully removed
384          * any file at all, we'll go ahead and commit to it all:
385          * by then we've already committed ourselves and can't fail
386          * in the middle)
387          */
388         if (!index_only) {
389                 int removed = 0, gitmodules_modified = 0;
390                 struct strbuf buf = STRBUF_INIT;
391                 for (i = 0; i < list.nr; i++) {
392                         const char *path = list.entry[i].name;
393                         if (list.entry[i].is_submodule) {
394                                 if (is_empty_dir(path)) {
395                                         if (!rmdir(path)) {
396                                                 removed = 1;
397                                                 if (!remove_path_from_gitmodules(path))
398                                                         gitmodules_modified = 1;
399                                                 continue;
400                                         }
401                                 } else {
402                                         strbuf_reset(&buf);
403                                         strbuf_addstr(&buf, path);
404                                         if (!remove_dir_recursively(&buf, 0)) {
405                                                 removed = 1;
406                                                 if (!remove_path_from_gitmodules(path))
407                                                         gitmodules_modified = 1;
408                                                 strbuf_release(&buf);
409                                                 continue;
410                                         } else if (!file_exists(path))
411                                                 /* Submodule was removed by user */
412                                                 if (!remove_path_from_gitmodules(path))
413                                                         gitmodules_modified = 1;
414                                         /* Fallthrough and let remove_path() fail. */
415                                 }
416                         }
417                         if (!remove_path(path)) {
418                                 removed = 1;
419                                 continue;
420                         }
421                         if (!removed)
422                                 die_errno("git rm: '%s'", path);
423                 }
424                 strbuf_release(&buf);
425                 if (gitmodules_modified)
426                         stage_updated_gitmodules();
427         }
428
429         if (active_cache_changed) {
430                 if (write_locked_index(&the_index, &lock_file, COMMIT_LOCK))
431                         die(_("Unable to write new index file"));
432         }
433
434         return 0;
435 }