fast-import: Allow "reset" to delete a new branch without error
[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 remove_file(const char *name)
33 {
34         int ret;
35         char *slash;
36
37         ret = unlink(name);
38         if (ret && errno == ENOENT)
39                 /* The user has removed it from the filesystem by hand */
40                 ret = errno = 0;
41
42         if (!ret && (slash = strrchr(name, '/'))) {
43                 char *n = xstrdup(name);
44                 do {
45                         n[slash - name] = 0;
46                         name = n;
47                 } while (!rmdir(name) && (slash = strrchr(name, '/')));
48         }
49         return ret;
50 }
51
52 static int check_local_mod(unsigned char *head, int index_only)
53 {
54         /* items in list are already sorted in the cache order,
55          * so we could do this a lot more efficiently by using
56          * tree_desc based traversal if we wanted to, but I am
57          * lazy, and who cares if removal of files is a tad
58          * slower than the theoretical maximum speed?
59          */
60         int i, no_head;
61         int errs = 0;
62
63         no_head = is_null_sha1(head);
64         for (i = 0; i < list.nr; i++) {
65                 struct stat st;
66                 int pos;
67                 struct cache_entry *ce;
68                 const char *name = list.name[i];
69                 unsigned char sha1[20];
70                 unsigned mode;
71                 int local_changes = 0;
72                 int staged_changes = 0;
73
74                 pos = cache_name_pos(name, strlen(name));
75                 if (pos < 0)
76                         continue; /* removing unmerged entry */
77                 ce = active_cache[pos];
78
79                 if (lstat(ce->name, &st) < 0) {
80                         if (errno != ENOENT)
81                                 fprintf(stderr, "warning: '%s': %s",
82                                         ce->name, strerror(errno));
83                         /* It already vanished from the working tree */
84                         continue;
85                 }
86                 else if (S_ISDIR(st.st_mode)) {
87                         /* if a file was removed and it is now a
88                          * directory, that is the same as ENOENT as
89                          * far as git is concerned; we do not track
90                          * directories.
91                          */
92                         continue;
93                 }
94                 if (ce_match_stat(ce, &st, 0))
95                         local_changes = 1;
96                 if (no_head
97                      || get_tree_entry(head, name, sha1, &mode)
98                      || ce->ce_mode != create_ce_mode(mode)
99                      || hashcmp(ce->sha1, sha1))
100                         staged_changes = 1;
101
102                 if (local_changes && staged_changes)
103                         errs = error("'%s' has staged content different "
104                                      "from both the file and the HEAD\n"
105                                      "(use -f to force removal)", name);
106                 else if (!index_only) {
107                         /* It's not dangerous to git-rm --cached a
108                          * file if the index matches the file or the
109                          * HEAD, since it means the deleted content is
110                          * still available somewhere.
111                          */
112                         if (staged_changes)
113                                 errs = error("'%s' has changes staged in the index\n"
114                                              "(use --cached to keep the file, "
115                                              "or -f to force removal)", name);
116                         if (local_changes)
117                                 errs = error("'%s' has local modifications\n"
118                                              "(use --cached to keep the file, "
119                                              "or -f to force removal)", name);
120                 }
121         }
122         return errs;
123 }
124
125 static struct lock_file lock_file;
126
127 static int show_only = 0, force = 0, index_only = 0, recursive = 0, quiet = 0;
128 static int ignore_unmatch = 0;
129
130 static struct option builtin_rm_options[] = {
131         OPT__DRY_RUN(&show_only),
132         OPT__QUIET(&quiet),
133         OPT_BOOLEAN( 0 , "cached",         &index_only, "only remove from the index"),
134         OPT_BOOLEAN('f', NULL,             &force,      "override the up-to-date check"),
135         OPT_BOOLEAN('r', NULL,             &recursive,  "allow recursive removal"),
136         OPT_BOOLEAN( 0 , "ignore-unmatch", &ignore_unmatch,
137                                 "exit with a zero status even if nothing matched"),
138         OPT_END(),
139 };
140
141 int cmd_rm(int argc, const char **argv, const char *prefix)
142 {
143         int i, newfd;
144         const char **pathspec;
145         char *seen;
146
147         git_config(git_default_config);
148
149         newfd = hold_locked_index(&lock_file, 1);
150
151         if (read_cache() < 0)
152                 die("index file corrupt");
153
154         argc = parse_options(argc, argv, builtin_rm_options, builtin_rm_usage, 0);
155         if (!argc)
156                 usage_with_options(builtin_rm_usage, builtin_rm_options);
157
158         if (!index_only)
159                 setup_work_tree();
160
161         pathspec = get_pathspec(prefix, argv);
162         seen = NULL;
163         for (i = 0; pathspec[i] ; i++)
164                 /* nothing */;
165         seen = xcalloc(i, 1);
166
167         for (i = 0; i < active_nr; i++) {
168                 struct cache_entry *ce = active_cache[i];
169                 if (!match_pathspec(pathspec, ce->name, ce_namelen(ce), 0, seen))
170                         continue;
171                 add_list(ce->name);
172         }
173
174         if (pathspec) {
175                 const char *match;
176                 int seen_any = 0;
177                 for (i = 0; (match = pathspec[i]) != NULL ; i++) {
178                         if (!seen[i]) {
179                                 if (!ignore_unmatch) {
180                                         die("pathspec '%s' did not match any files",
181                                             match);
182                                 }
183                         }
184                         else {
185                                 seen_any = 1;
186                         }
187                         if (!recursive && seen[i] == MATCHED_RECURSIVELY)
188                                 die("not removing '%s' recursively without -r",
189                                     *match ? match : ".");
190                 }
191
192                 if (! seen_any)
193                         exit(0);
194         }
195
196         /*
197          * If not forced, the file, the index and the HEAD (if exists)
198          * must match; but the file can already been removed, since
199          * this sequence is a natural "novice" way:
200          *
201          *      rm F; git rm F
202          *
203          * Further, if HEAD commit exists, "diff-index --cached" must
204          * report no changes unless forced.
205          */
206         if (!force) {
207                 unsigned char sha1[20];
208                 if (get_sha1("HEAD", sha1))
209                         hashclr(sha1);
210                 if (check_local_mod(sha1, index_only))
211                         exit(1);
212         }
213
214         /*
215          * First remove the names from the index: we won't commit
216          * the index unless all of them succeed.
217          */
218         for (i = 0; i < list.nr; i++) {
219                 const char *path = list.name[i];
220                 if (!quiet)
221                         printf("rm '%s'\n", path);
222
223                 if (remove_file_from_cache(path))
224                         die("git-rm: unable to remove %s", path);
225         }
226
227         if (show_only)
228                 return 0;
229
230         /*
231          * Then, unless we used "--cached", remove the filenames from
232          * the workspace. If we fail to remove the first one, we
233          * abort the "git rm" (but once we've successfully removed
234          * any file at all, we'll go ahead and commit to it all:
235          * by then we've already committed ourselves and can't fail
236          * in the middle)
237          */
238         if (!index_only) {
239                 int removed = 0;
240                 for (i = 0; i < list.nr; i++) {
241                         const char *path = list.name[i];
242                         if (!remove_file(path)) {
243                                 removed = 1;
244                                 continue;
245                         }
246                         if (!removed)
247                                 die("git-rm: %s: %s", path, strerror(errno));
248                 }
249         }
250
251         if (active_cache_changed) {
252                 if (write_cache(newfd, active_cache, active_nr) ||
253                     commit_locked_index(&lock_file))
254                         die("Unable to write new index file");
255         }
256
257         return 0;
258 }