Merge branch 'js/maint-diff-temp-smudge' into maint
[git] / builtin-rm.c
1 /*
2  * "git rm" builtin command
3  *
4  * Copyright (C) Linus Torvalds 2006
5  */
6 #include "cache.h"
7 #include "builtin.h"
8 #include "dir.h"
9 #include "cache-tree.h"
10 #include "tree-walk.h"
11 #include "parse-options.h"
12
13 static const char * const builtin_rm_usage[] = {
14         "git rm [options] [--] <file>...",
15         NULL
16 };
17
18 static struct {
19         int nr, alloc;
20         const char **name;
21 } list;
22
23 static void add_list(const char *name)
24 {
25         if (list.nr >= list.alloc) {
26                 list.alloc = alloc_nr(list.alloc);
27                 list.name = xrealloc(list.name, list.alloc * sizeof(const char *));
28         }
29         list.name[list.nr++] = name;
30 }
31
32 static int check_local_mod(unsigned char *head, int index_only)
33 {
34         /*
35          * Items in list are already sorted in the cache order,
36          * so we could do this a lot more efficiently by using
37          * tree_desc based traversal if we wanted to, but I am
38          * lazy, and who cares if removal of files is a tad
39          * slower than the theoretical maximum speed?
40          */
41         int i, no_head;
42         int errs = 0;
43
44         no_head = is_null_sha1(head);
45         for (i = 0; i < list.nr; i++) {
46                 struct stat st;
47                 int pos;
48                 struct cache_entry *ce;
49                 const char *name = list.name[i];
50                 unsigned char sha1[20];
51                 unsigned mode;
52                 int local_changes = 0;
53                 int staged_changes = 0;
54
55                 pos = cache_name_pos(name, strlen(name));
56                 if (pos < 0)
57                         continue; /* removing unmerged entry */
58                 ce = active_cache[pos];
59
60                 if (lstat(ce->name, &st) < 0) {
61                         if (errno != ENOENT)
62                                 fprintf(stderr, "warning: '%s': %s",
63                                         ce->name, strerror(errno));
64                         /* It already vanished from the working tree */
65                         continue;
66                 }
67                 else if (S_ISDIR(st.st_mode)) {
68                         /* if a file was removed and it is now a
69                          * directory, that is the same as ENOENT as
70                          * far as git is concerned; we do not track
71                          * directories.
72                          */
73                         continue;
74                 }
75
76                 /*
77                  * "rm" of a path that has changes need to be treated
78                  * carefully not to allow losing local changes
79                  * accidentally.  A local change could be (1) file in
80                  * work tree is different since the index; and/or (2)
81                  * the user staged a content that is different from
82                  * the current commit in the index.
83                  *
84                  * In such a case, you would need to --force the
85                  * removal.  However, "rm --cached" (remove only from
86                  * the index) is safe if the index matches the file in
87                  * the work tree or the HEAD commit, as it means that
88                  * the content being removed is available elsewhere.
89                  */
90
91                 /*
92                  * Is the index different from the file in the work tree?
93                  */
94                 if (ce_match_stat(ce, &st, 0))
95                         local_changes = 1;
96
97                 /*
98                  * Is the index different from the HEAD commit?  By
99                  * definition, before the very initial commit,
100                  * anything staged in the index is treated by the same
101                  * way as changed from the HEAD.
102                  */
103                 if (no_head
104                      || get_tree_entry(head, name, sha1, &mode)
105                      || ce->ce_mode != create_ce_mode(mode)
106                      || hashcmp(ce->sha1, sha1))
107                         staged_changes = 1;
108
109                 /*
110                  * If the index does not match the file in the work
111                  * tree and if it does not match the HEAD commit
112                  * either, (1) "git rm" without --cached definitely
113                  * will lose information; (2) "git rm --cached" will
114                  * lose information unless it is about removing an
115                  * "intent to add" entry.
116                  */
117                 if (local_changes && staged_changes) {
118                         if (!index_only || !(ce->ce_flags & CE_INTENT_TO_ADD))
119                                 errs = error("'%s' has staged content different "
120                                              "from both the file and the HEAD\n"
121                                              "(use -f to force removal)", name);
122                 }
123                 else if (!index_only) {
124                         if (staged_changes)
125                                 errs = error("'%s' has changes staged in the index\n"
126                                              "(use --cached to keep the file, "
127                                              "or -f to force removal)", name);
128                         if (local_changes)
129                                 errs = error("'%s' has local modifications\n"
130                                              "(use --cached to keep the file, "
131                                              "or -f to force removal)", name);
132                 }
133         }
134         return errs;
135 }
136
137 static struct lock_file lock_file;
138
139 static int show_only = 0, force = 0, index_only = 0, recursive = 0, quiet = 0;
140 static int ignore_unmatch = 0;
141
142 static struct option builtin_rm_options[] = {
143         OPT__DRY_RUN(&show_only),
144         OPT__QUIET(&quiet),
145         OPT_BOOLEAN( 0 , "cached",         &index_only, "only remove from the index"),
146         OPT_BOOLEAN('f', "force",          &force,      "override the up-to-date check"),
147         OPT_BOOLEAN('r', NULL,             &recursive,  "allow recursive removal"),
148         OPT_BOOLEAN( 0 , "ignore-unmatch", &ignore_unmatch,
149                                 "exit with a zero status even if nothing matched"),
150         OPT_END(),
151 };
152
153 int cmd_rm(int argc, const char **argv, const char *prefix)
154 {
155         int i, newfd;
156         const char **pathspec;
157         char *seen;
158
159         git_config(git_default_config, NULL);
160
161         argc = parse_options(argc, argv, builtin_rm_options, builtin_rm_usage, 0);
162         if (!argc)
163                 usage_with_options(builtin_rm_usage, builtin_rm_options);
164
165         if (!index_only)
166                 setup_work_tree();
167
168         newfd = hold_locked_index(&lock_file, 1);
169
170         if (read_cache() < 0)
171                 die("index file corrupt");
172         refresh_cache(REFRESH_QUIET);
173
174         pathspec = get_pathspec(prefix, argv);
175         seen = NULL;
176         for (i = 0; pathspec[i] ; i++)
177                 /* nothing */;
178         seen = xcalloc(i, 1);
179
180         for (i = 0; i < active_nr; i++) {
181                 struct cache_entry *ce = active_cache[i];
182                 if (!match_pathspec(pathspec, ce->name, ce_namelen(ce), 0, seen))
183                         continue;
184                 add_list(ce->name);
185         }
186
187         if (pathspec) {
188                 const char *match;
189                 int seen_any = 0;
190                 for (i = 0; (match = pathspec[i]) != NULL ; i++) {
191                         if (!seen[i]) {
192                                 if (!ignore_unmatch) {
193                                         die("pathspec '%s' did not match any files",
194                                             match);
195                                 }
196                         }
197                         else {
198                                 seen_any = 1;
199                         }
200                         if (!recursive && seen[i] == MATCHED_RECURSIVELY)
201                                 die("not removing '%s' recursively without -r",
202                                     *match ? match : ".");
203                 }
204
205                 if (! seen_any)
206                         exit(0);
207         }
208
209         /*
210          * If not forced, the file, the index and the HEAD (if exists)
211          * must match; but the file can already been removed, since
212          * this sequence is a natural "novice" way:
213          *
214          *      rm F; git rm F
215          *
216          * Further, if HEAD commit exists, "diff-index --cached" must
217          * report no changes unless forced.
218          */
219         if (!force) {
220                 unsigned char sha1[20];
221                 if (get_sha1("HEAD", sha1))
222                         hashclr(sha1);
223                 if (check_local_mod(sha1, index_only))
224                         exit(1);
225         }
226
227         /*
228          * First remove the names from the index: we won't commit
229          * the index unless all of them succeed.
230          */
231         for (i = 0; i < list.nr; i++) {
232                 const char *path = list.name[i];
233                 if (!quiet)
234                         printf("rm '%s'\n", path);
235
236                 if (remove_file_from_cache(path))
237                         die("git rm: unable to remove %s", path);
238         }
239
240         if (show_only)
241                 return 0;
242
243         /*
244          * Then, unless we used "--cached", remove the filenames from
245          * the workspace. If we fail to remove the first one, we
246          * abort the "git rm" (but once we've successfully removed
247          * any file at all, we'll go ahead and commit to it all:
248          * by then we've already committed ourselves and can't fail
249          * in the middle)
250          */
251         if (!index_only) {
252                 int removed = 0;
253                 for (i = 0; i < list.nr; i++) {
254                         const char *path = list.name[i];
255                         if (!remove_path(path)) {
256                                 removed = 1;
257                                 continue;
258                         }
259                         if (!removed)
260                                 die("git rm: %s: %s", path, strerror(errno));
261                 }
262         }
263
264         if (active_cache_changed) {
265                 if (write_cache(newfd, active_cache, active_nr) ||
266                     commit_locked_index(&lock_file))
267                         die("Unable to write new index file");
268         }
269
270         return 0;
271 }