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1 | /* | |
2 | * "diff --no-index" support | |
3 | * Copyright (c) 2007 by Johannes Schindelin | |
4 | * Copyright (c) 2008 by Junio C Hamano | |
5 | */ | |
6 | ||
7 | #include "git-compat-util.h" | |
8 | #include "abspath.h" | |
9 | #include "color.h" | |
10 | #include "commit.h" | |
11 | #include "diff.h" | |
12 | #include "diffcore.h" | |
13 | #include "gettext.h" | |
14 | #include "revision.h" | |
15 | #include "parse-options.h" | |
16 | #include "string-list.h" | |
17 | #include "dir.h" | |
18 | ||
19 | static int read_directory_contents(const char *path, struct string_list *list) | |
20 | { | |
21 | DIR *dir; | |
22 | struct dirent *e; | |
23 | ||
24 | if (!(dir = opendir(path))) | |
25 | return error("Could not open directory %s", path); | |
26 | ||
27 | while ((e = readdir_skip_dot_and_dotdot(dir))) | |
28 | string_list_insert(list, e->d_name); | |
29 | ||
30 | closedir(dir); | |
31 | return 0; | |
32 | } | |
33 | ||
34 | /* | |
35 | * This should be "(standard input)" or something, but it will | |
36 | * probably expose many more breakages in the way no-index code | |
37 | * is bolted onto the diff callchain. | |
38 | */ | |
39 | static const char file_from_standard_input[] = "-"; | |
40 | ||
41 | /* | |
42 | * For paths given on the command-line we treat "-" as stdin and named | |
43 | * pipes and symbolic links to named pipes specially. | |
44 | */ | |
45 | enum special { | |
46 | SPECIAL_NONE, | |
47 | SPECIAL_STDIN, | |
48 | SPECIAL_PIPE, | |
49 | }; | |
50 | ||
51 | static int get_mode(const char *path, int *mode, enum special *special) | |
52 | { | |
53 | struct stat st; | |
54 | ||
55 | if (!path || !strcmp(path, "/dev/null")) { | |
56 | *mode = 0; | |
57 | #ifdef GIT_WINDOWS_NATIVE | |
58 | } else if (!strcasecmp(path, "nul")) { | |
59 | *mode = 0; | |
60 | #endif | |
61 | } else if (path == file_from_standard_input) { | |
62 | *mode = create_ce_mode(0666); | |
63 | *special = SPECIAL_STDIN; | |
64 | } else if (lstat(path, &st)) { | |
65 | return error("Could not access '%s'", path); | |
66 | } else { | |
67 | *mode = st.st_mode; | |
68 | } | |
69 | /* | |
70 | * For paths on the command-line treat named pipes and symbolic | |
71 | * links that resolve to a named pipe specially. | |
72 | */ | |
73 | if (special && | |
74 | (S_ISFIFO(*mode) || | |
75 | (S_ISLNK(*mode) && !stat(path, &st) && S_ISFIFO(st.st_mode)))) { | |
76 | *mode = create_ce_mode(0666); | |
77 | *special = SPECIAL_PIPE; | |
78 | } | |
79 | ||
80 | return 0; | |
81 | } | |
82 | ||
83 | static void populate_common(struct diff_filespec *s, struct strbuf *buf) | |
84 | { | |
85 | size_t size = 0; | |
86 | ||
87 | s->should_munmap = 0; | |
88 | s->data = strbuf_detach(buf, &size); | |
89 | s->size = size; | |
90 | s->should_free = 1; | |
91 | s->is_stdin = 1; | |
92 | } | |
93 | ||
94 | static void populate_from_pipe(struct diff_filespec *s) | |
95 | { | |
96 | struct strbuf buf = STRBUF_INIT; | |
97 | int fd = xopen(s->path, O_RDONLY); | |
98 | ||
99 | if (strbuf_read(&buf, fd, 0) < 0) | |
100 | die_errno("error while reading from '%s'", s->path); | |
101 | close(fd); | |
102 | populate_common(s, &buf); | |
103 | } | |
104 | ||
105 | static void populate_from_stdin(struct diff_filespec *s) | |
106 | { | |
107 | struct strbuf buf = STRBUF_INIT; | |
108 | ||
109 | if (strbuf_read(&buf, 0, 0) < 0) | |
110 | die_errno("error while reading from stdin"); | |
111 | populate_common(s, &buf); | |
112 | } | |
113 | ||
114 | static struct diff_filespec *noindex_filespec(const char *name, int mode, | |
115 | enum special special) | |
116 | { | |
117 | struct diff_filespec *s; | |
118 | ||
119 | if (!name) | |
120 | name = "/dev/null"; | |
121 | s = alloc_filespec(name); | |
122 | fill_filespec(s, null_oid(), 0, mode); | |
123 | if (special == SPECIAL_STDIN) | |
124 | populate_from_stdin(s); | |
125 | else if (special == SPECIAL_PIPE) | |
126 | populate_from_pipe(s); | |
127 | return s; | |
128 | } | |
129 | ||
130 | static int queue_diff(struct diff_options *o, | |
131 | const char *name1, const char *name2, int recursing) | |
132 | { | |
133 | int mode1 = 0, mode2 = 0; | |
134 | enum special special1 = SPECIAL_NONE, special2 = SPECIAL_NONE; | |
135 | ||
136 | /* Paths can only be special if we're not recursing. */ | |
137 | if (get_mode(name1, &mode1, recursing ? NULL : &special1) || | |
138 | get_mode(name2, &mode2, recursing ? NULL : &special2)) | |
139 | return -1; | |
140 | ||
141 | if (mode1 && mode2 && S_ISDIR(mode1) != S_ISDIR(mode2)) { | |
142 | struct diff_filespec *d1, *d2; | |
143 | ||
144 | if (S_ISDIR(mode1)) { | |
145 | /* 2 is file that is created */ | |
146 | d1 = noindex_filespec(NULL, 0, SPECIAL_NONE); | |
147 | d2 = noindex_filespec(name2, mode2, special2); | |
148 | name2 = NULL; | |
149 | mode2 = 0; | |
150 | } else { | |
151 | /* 1 is file that is deleted */ | |
152 | d1 = noindex_filespec(name1, mode1, special1); | |
153 | d2 = noindex_filespec(NULL, 0, SPECIAL_NONE); | |
154 | name1 = NULL; | |
155 | mode1 = 0; | |
156 | } | |
157 | /* emit that file */ | |
158 | diff_queue(&diff_queued_diff, d1, d2); | |
159 | ||
160 | /* and then let the entire directory be created or deleted */ | |
161 | } | |
162 | ||
163 | if (S_ISDIR(mode1) || S_ISDIR(mode2)) { | |
164 | struct strbuf buffer1 = STRBUF_INIT; | |
165 | struct strbuf buffer2 = STRBUF_INIT; | |
166 | struct string_list p1 = STRING_LIST_INIT_DUP; | |
167 | struct string_list p2 = STRING_LIST_INIT_DUP; | |
168 | int i1, i2, ret = 0; | |
169 | size_t len1 = 0, len2 = 0; | |
170 | ||
171 | if (name1 && read_directory_contents(name1, &p1)) | |
172 | return -1; | |
173 | if (name2 && read_directory_contents(name2, &p2)) { | |
174 | string_list_clear(&p1, 0); | |
175 | return -1; | |
176 | } | |
177 | ||
178 | if (name1) { | |
179 | strbuf_addstr(&buffer1, name1); | |
180 | strbuf_complete(&buffer1, '/'); | |
181 | len1 = buffer1.len; | |
182 | } | |
183 | ||
184 | if (name2) { | |
185 | strbuf_addstr(&buffer2, name2); | |
186 | strbuf_complete(&buffer2, '/'); | |
187 | len2 = buffer2.len; | |
188 | } | |
189 | ||
190 | for (i1 = i2 = 0; !ret && (i1 < p1.nr || i2 < p2.nr); ) { | |
191 | const char *n1, *n2; | |
192 | int comp; | |
193 | ||
194 | strbuf_setlen(&buffer1, len1); | |
195 | strbuf_setlen(&buffer2, len2); | |
196 | ||
197 | if (i1 == p1.nr) | |
198 | comp = 1; | |
199 | else if (i2 == p2.nr) | |
200 | comp = -1; | |
201 | else | |
202 | comp = strcmp(p1.items[i1].string, p2.items[i2].string); | |
203 | ||
204 | if (comp > 0) | |
205 | n1 = NULL; | |
206 | else { | |
207 | strbuf_addstr(&buffer1, p1.items[i1++].string); | |
208 | n1 = buffer1.buf; | |
209 | } | |
210 | ||
211 | if (comp < 0) | |
212 | n2 = NULL; | |
213 | else { | |
214 | strbuf_addstr(&buffer2, p2.items[i2++].string); | |
215 | n2 = buffer2.buf; | |
216 | } | |
217 | ||
218 | ret = queue_diff(o, n1, n2, 1); | |
219 | } | |
220 | string_list_clear(&p1, 0); | |
221 | string_list_clear(&p2, 0); | |
222 | strbuf_release(&buffer1); | |
223 | strbuf_release(&buffer2); | |
224 | ||
225 | return ret; | |
226 | } else { | |
227 | struct diff_filespec *d1, *d2; | |
228 | ||
229 | if (o->flags.reverse_diff) { | |
230 | SWAP(mode1, mode2); | |
231 | SWAP(name1, name2); | |
232 | SWAP(special1, special2); | |
233 | } | |
234 | ||
235 | d1 = noindex_filespec(name1, mode1, special1); | |
236 | d2 = noindex_filespec(name2, mode2, special2); | |
237 | diff_queue(&diff_queued_diff, d1, d2); | |
238 | return 0; | |
239 | } | |
240 | } | |
241 | ||
242 | /* append basename of F to D */ | |
243 | static void append_basename(struct strbuf *path, const char *dir, const char *file) | |
244 | { | |
245 | const char *tail = strrchr(file, '/'); | |
246 | ||
247 | strbuf_addstr(path, dir); | |
248 | while (path->len && path->buf[path->len - 1] == '/') | |
249 | path->len--; | |
250 | strbuf_addch(path, '/'); | |
251 | strbuf_addstr(path, tail ? tail + 1 : file); | |
252 | } | |
253 | ||
254 | /* | |
255 | * DWIM "diff D F" into "diff D/F F" and "diff F D" into "diff F D/F" | |
256 | * Note that we append the basename of F to D/, so "diff a/b/file D" | |
257 | * becomes "diff a/b/file D/file", not "diff a/b/file D/a/b/file". | |
258 | */ | |
259 | static void fixup_paths(const char **path, struct strbuf *replacement) | |
260 | { | |
261 | struct stat st; | |
262 | unsigned int isdir0 = 0, isdir1 = 0; | |
263 | unsigned int ispipe0 = 0, ispipe1 = 0; | |
264 | ||
265 | if (path[0] != file_from_standard_input && !stat(path[0], &st)) { | |
266 | isdir0 = S_ISDIR(st.st_mode); | |
267 | ispipe0 = S_ISFIFO(st.st_mode); | |
268 | } | |
269 | ||
270 | if (path[1] != file_from_standard_input && !stat(path[1], &st)) { | |
271 | isdir1 = S_ISDIR(st.st_mode); | |
272 | ispipe1 = S_ISFIFO(st.st_mode); | |
273 | } | |
274 | ||
275 | if ((path[0] == file_from_standard_input && isdir1) || | |
276 | (isdir0 && path[1] == file_from_standard_input)) | |
277 | die(_("cannot compare stdin to a directory")); | |
278 | ||
279 | if ((isdir0 && ispipe1) || (ispipe0 && isdir1)) | |
280 | die(_("cannot compare a named pipe to a directory")); | |
281 | ||
282 | if (isdir0 == isdir1) | |
283 | return; | |
284 | if (isdir0) { | |
285 | append_basename(replacement, path[0], path[1]); | |
286 | path[0] = replacement->buf; | |
287 | } else { | |
288 | append_basename(replacement, path[1], path[0]); | |
289 | path[1] = replacement->buf; | |
290 | } | |
291 | } | |
292 | ||
293 | static const char * const diff_no_index_usage[] = { | |
294 | N_("git diff --no-index [<options>] <path> <path>"), | |
295 | NULL | |
296 | }; | |
297 | ||
298 | int diff_no_index(struct rev_info *revs, | |
299 | int implicit_no_index, | |
300 | int argc, const char **argv) | |
301 | { | |
302 | int i, no_index; | |
303 | int ret = 1; | |
304 | const char *paths[2]; | |
305 | char *to_free[ARRAY_SIZE(paths)] = { 0 }; | |
306 | struct strbuf replacement = STRBUF_INIT; | |
307 | const char *prefix = revs->prefix; | |
308 | struct option no_index_options[] = { | |
309 | OPT_BOOL_F(0, "no-index", &no_index, "", | |
310 | PARSE_OPT_NONEG | PARSE_OPT_HIDDEN), | |
311 | OPT_END(), | |
312 | }; | |
313 | struct option *options; | |
314 | ||
315 | options = add_diff_options(no_index_options, &revs->diffopt); | |
316 | argc = parse_options(argc, argv, revs->prefix, options, | |
317 | diff_no_index_usage, 0); | |
318 | if (argc != 2) { | |
319 | if (implicit_no_index) | |
320 | warning(_("Not a git repository. Use --no-index to " | |
321 | "compare two paths outside a working tree")); | |
322 | usage_with_options(diff_no_index_usage, options); | |
323 | } | |
324 | FREE_AND_NULL(options); | |
325 | for (i = 0; i < 2; i++) { | |
326 | const char *p = argv[i]; | |
327 | if (!strcmp(p, "-")) | |
328 | /* | |
329 | * stdin should be spelled as "-"; if you have | |
330 | * path that is "-", spell it as "./-". | |
331 | */ | |
332 | p = file_from_standard_input; | |
333 | else if (prefix) | |
334 | p = to_free[i] = prefix_filename(prefix, p); | |
335 | paths[i] = p; | |
336 | } | |
337 | ||
338 | fixup_paths(paths, &replacement); | |
339 | ||
340 | revs->diffopt.skip_stat_unmatch = 1; | |
341 | if (!revs->diffopt.output_format) | |
342 | revs->diffopt.output_format = DIFF_FORMAT_PATCH; | |
343 | ||
344 | revs->diffopt.flags.no_index = 1; | |
345 | ||
346 | revs->diffopt.flags.relative_name = 1; | |
347 | revs->diffopt.prefix = prefix; | |
348 | ||
349 | revs->max_count = -2; | |
350 | diff_setup_done(&revs->diffopt); | |
351 | ||
352 | setup_diff_pager(&revs->diffopt); | |
353 | revs->diffopt.flags.exit_with_status = 1; | |
354 | ||
355 | if (queue_diff(&revs->diffopt, paths[0], paths[1], 0)) | |
356 | goto out; | |
357 | diff_set_mnemonic_prefix(&revs->diffopt, "1/", "2/"); | |
358 | diffcore_std(&revs->diffopt); | |
359 | diff_flush(&revs->diffopt); | |
360 | ||
361 | /* | |
362 | * The return code for --no-index imitates diff(1): | |
363 | * 0 = no changes, 1 = changes, else error | |
364 | */ | |
365 | ret = diff_result_code(&revs->diffopt); | |
366 | ||
367 | out: | |
368 | for (i = 0; i < ARRAY_SIZE(to_free); i++) | |
369 | free(to_free[i]); | |
370 | strbuf_release(&replacement); | |
371 | return ret; | |
372 | } |