1#include "cache.h"
2#include "dir.h"
3static int inside_git_dir = -1;
5static int inside_work_tree = -1;
6const char *prefix_path(const char *prefix, int len, const char *path)
8{
9 const char *orig = path;
10 char *sanitized = xmalloc(len + strlen(path) + 1);
11 if (is_absolute_path(orig))
12 strcpy(sanitized, path);
13 else {
14 if (len)
15 memcpy(sanitized, prefix, len);
16 strcpy(sanitized + len, path);
17 }
18 if (normalize_path_copy(sanitized, sanitized))
19 goto error_out;
20 if (is_absolute_path(orig)) {
21 size_t root_len, len, total;
22 const char *work_tree = get_git_work_tree();
23 if (!work_tree)
24 goto error_out;
25 len = strlen(work_tree);
26 root_len = offset_1st_component(work_tree);
27 total = strlen(sanitized) + 1;
28 if (strncmp(sanitized, work_tree, len) ||
29 (len > root_len && sanitized[len] != '\0' && sanitized[len] != '/')) {
30 error_out:
31 die("'%s' is outside repository", orig);
32 }
33 if (sanitized[len] == '/')
34 len++;
35 memmove(sanitized, sanitized + len, total - len);
36 }
37 return sanitized;
38}
39/*
41 * Unlike prefix_path, this should be used if the named file does
42 * not have to interact with index entry; i.e. name of a random file
43 * on the filesystem.
44 */
45const char *prefix_filename(const char *pfx, int pfx_len, const char *arg)
46{
47 static char path[PATH_MAX];
48#ifndef WIN32
49 if (!pfx || !*pfx || is_absolute_path(arg))
50 return arg;
51 memcpy(path, pfx, pfx_len);
52 strcpy(path + pfx_len, arg);
53#else
54 char *p;
55 /* don't add prefix to absolute paths, but still replace '\' by '/' */
56 if (is_absolute_path(arg))
57 pfx_len = 0;
58 else
59 memcpy(path, pfx, pfx_len);
60 strcpy(path + pfx_len, arg);
61 for (p = path + pfx_len; *p; p++)
62 if (*p == '\\')
63 *p = '/';
64#endif
65 return path;
66}
67int check_filename(const char *prefix, const char *arg)
69{
70 const char *name;
71 struct stat st;
72 name = prefix ? prefix_filename(prefix, strlen(prefix), arg) : arg;
74 if (!lstat(name, &st))
75 return 1; /* file exists */
76 if (errno == ENOENT || errno == ENOTDIR)
77 return 0; /* file does not exist */
78 die_errno("failed to stat '%s'", arg);
79}
80static void NORETURN die_verify_filename(const char *prefix, const char *arg)
82{
83 unsigned char sha1[20];
84 unsigned mode;
85 /* try a detailed diagnostic ... */
86 get_sha1_with_mode_1(arg, sha1, &mode, 0, prefix);
87 /* ... or fall back the most general message. */
88 die("ambiguous argument '%s': unknown revision or path not in the working tree.\n"
89 "Use '--' to separate paths from revisions", arg);
90}
92/*
94 * Verify a filename that we got as an argument for a pathspec
95 * entry. Note that a filename that begins with "-" never verifies
96 * as true, because even if such a filename were to exist, we want
97 * it to be preceded by the "--" marker (or we want the user to
98 * use a format like "./-filename")
99 */
100void verify_filename(const char *prefix, const char *arg)
101{
102 if (*arg == '-')
103 die("bad flag '%s' used after filename", arg);
104 if (check_filename(prefix, arg))
105 return;
106 die_verify_filename(prefix, arg);
107}
108/*
110 * Opposite of the above: the command line did not have -- marker
111 * and we parsed the arg as a refname. It should not be interpretable
112 * as a filename.
113 */
114void verify_non_filename(const char *prefix, const char *arg)
115{
116 if (!is_inside_work_tree() || is_inside_git_dir())
117 return;
118 if (*arg == '-')
119 return; /* flag */
120 if (!check_filename(prefix, arg))
121 return;
122 die("ambiguous argument '%s': both revision and filename\n"
123 "Use '--' to separate filenames from revisions", arg);
124}
125const char **get_pathspec(const char *prefix, const char **pathspec)
127{
128 const char *entry = *pathspec;
129 const char **src, **dst;
130 int prefixlen;
131 if (!prefix && !entry)
133 return NULL;
134 if (!entry) {
136 static const char *spec[2];
137 spec[0] = prefix;
138 spec[1] = NULL;
139 return spec;
140 }
141 /* Otherwise we have to re-write the entries.. */
143 src = pathspec;
144 dst = pathspec;
145 prefixlen = prefix ? strlen(prefix) : 0;
146 while (*src) {
147 const char *p = prefix_path(prefix, prefixlen, *src);
148 *(dst++) = p;
149 src++;
150 }
151 *dst = NULL;
152 if (!*pathspec)
153 return NULL;
154 return pathspec;
155}
156/*
158 * Test if it looks like we're at a git directory.
159 * We want to see:
160 *
161 * - either an objects/ directory _or_ the proper
162 * GIT_OBJECT_DIRECTORY environment variable
163 * - a refs/ directory
164 * - either a HEAD symlink or a HEAD file that is formatted as
165 * a proper "ref:", or a regular file HEAD that has a properly
166 * formatted sha1 object name.
167 */
168static int is_git_directory(const char *suspect)
169{
170 char path[PATH_MAX];
171 size_t len = strlen(suspect);
172 strcpy(path, suspect);
174 if (getenv(DB_ENVIRONMENT)) {
175 if (access(getenv(DB_ENVIRONMENT), X_OK))
176 return 0;
177 }
178 else {
179 strcpy(path + len, "/objects");
180 if (access(path, X_OK))
181 return 0;
182 }
183 strcpy(path + len, "/refs");
185 if (access(path, X_OK))
186 return 0;
187 strcpy(path + len, "/HEAD");
189 if (validate_headref(path))
190 return 0;
191 return 1;
193}
194int is_inside_git_dir(void)
196{
197 if (inside_git_dir < 0)
198 inside_git_dir = is_inside_dir(get_git_dir());
199 return inside_git_dir;
200}
201int is_inside_work_tree(void)
203{
204 if (inside_work_tree < 0)
205 inside_work_tree = is_inside_dir(get_git_work_tree());
206 return inside_work_tree;
207}
208/*
210 * set_work_tree() is only ever called if you set GIT_DIR explicitly.
211 * The old behaviour (which we retain here) is to set the work tree root
212 * to the cwd, unless overridden by the config, the command line, or
213 * GIT_WORK_TREE.
214 */
215static const char *set_work_tree(const char *dir)
216{
217 char buffer[PATH_MAX + 1];
218 if (!getcwd(buffer, sizeof(buffer)))
220 die ("Could not get the current working directory");
221 git_work_tree_cfg = xstrdup(buffer);
222 inside_work_tree = 1;
223 return NULL;
225}
226void setup_work_tree(void)
228{
229 const char *work_tree, *git_dir;
230 static int initialized = 0;
231 if (initialized)
233 return;
234 work_tree = get_git_work_tree();
235 git_dir = get_git_dir();
236 if (!is_absolute_path(git_dir))
237 git_dir = make_absolute_path(git_dir);
238 if (!work_tree || chdir(work_tree))
239 die("This operation must be run in a work tree");
240 set_git_dir(make_relative_path(git_dir, work_tree));
241 initialized = 1;
242}
243static int check_repository_format_gently(int *nongit_ok)
245{
246 git_config(check_repository_format_version, NULL);
247 if (GIT_REPO_VERSION < repository_format_version) {
248 if (!nongit_ok)
249 die ("Expected git repo version <= %d, found %d",
250 GIT_REPO_VERSION, repository_format_version);
251 warning("Expected git repo version <= %d, found %d",
252 GIT_REPO_VERSION, repository_format_version);
253 warning("Please upgrade Git");
254 *nongit_ok = -1;
255 return -1;
256 }
257 return 0;
258}
259/*
261 * Try to read the location of the git directory from the .git file,
262 * return path to git directory if found.
263 */
264const char *read_gitfile_gently(const char *path)
265{
266 char *buf;
267 char *dir;
268 const char *slash;
269 struct stat st;
270 int fd;
271 size_t len;
272 if (stat(path, &st))
274 return NULL;
275 if (!S_ISREG(st.st_mode))
276 return NULL;
277 fd = open(path, O_RDONLY);
278 if (fd < 0)
279 die_errno("Error opening '%s'", path);
280 buf = xmalloc(st.st_size + 1);
281 len = read_in_full(fd, buf, st.st_size);
282 close(fd);
283 if (len != st.st_size)
284 die("Error reading %s", path);
285 buf[len] = '\0';
286 if (prefixcmp(buf, "gitdir: "))
287 die("Invalid gitfile format: %s", path);
288 while (buf[len - 1] == '\n' || buf[len - 1] == '\r')
289 len--;
290 if (len < 9)
291 die("No path in gitfile: %s", path);
292 buf[len] = '\0';
293 dir = buf + 8;
294 if (!is_absolute_path(dir) && (slash = strrchr(path, '/'))) {
296 size_t pathlen = slash+1 - path;
297 size_t dirlen = pathlen + len - 8;
298 dir = xmalloc(dirlen + 1);
299 strncpy(dir, path, pathlen);
300 strncpy(dir + pathlen, buf + 8, len - 8);
301 dir[dirlen] = '\0';
302 free(buf);
303 buf = dir;
304 }
305 if (!is_git_directory(dir))
307 die("Not a git repository: %s", dir);
308 path = make_absolute_path(dir);
309 free(buf);
311 return path;
312}
313/*
315 * We cannot decide in this function whether we are in the work tree or
316 * not, since the config can only be read _after_ this function was called.
317 */
318const char *setup_git_directory_gently(int *nongit_ok)
319{
320 const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
321 const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT);
322 static char cwd[PATH_MAX+1];
323 const char *gitdirenv;
324 const char *gitfile_dir;
325 int len, offset, ceil_offset, root_len;
326 dev_t current_device = 0;
327 int one_filesystem = 1;
328 struct stat buf;
329 /*
331 * Let's assume that we are in a git repository.
332 * If it turns out later that we are somewhere else, the value will be
333 * updated accordingly.
334 */
335 if (nongit_ok)
336 *nongit_ok = 0;
337 /*
339 * If GIT_DIR is set explicitly, we're not going
340 * to do any discovery, but we still do repository
341 * validation.
342 */
343 gitdirenv = getenv(GIT_DIR_ENVIRONMENT);
344 if (gitdirenv) {
345 if (PATH_MAX - 40 < strlen(gitdirenv))
346 die("'$%s' too big", GIT_DIR_ENVIRONMENT);
347 if (is_git_directory(gitdirenv)) {
348 static char buffer[1024 + 1];
349 const char *retval;
350 if (!work_tree_env) {
352 retval = set_work_tree(gitdirenv);
353 /* config may override worktree */
354 if (check_repository_format_gently(nongit_ok))
355 return NULL;
356 return retval;
357 }
358 if (check_repository_format_gently(nongit_ok))
359 return NULL;
360 retval = get_relative_cwd(buffer, sizeof(buffer) - 1,
361 get_git_work_tree());
362 if (!retval || !*retval)
363 return NULL;
364 set_git_dir(make_absolute_path(gitdirenv));
365 if (chdir(work_tree_env) < 0)
366 die_errno ("Could not chdir to '%s'", work_tree_env);
367 strcat(buffer, "/");
368 return retval;
369 }
370 if (nongit_ok) {
371 *nongit_ok = 1;
372 return NULL;
373 }
374 die("Not a git repository: '%s'", gitdirenv);
375 }
376 if (!getcwd(cwd, sizeof(cwd)-1))
378 die_errno("Unable to read current working directory");
379 ceil_offset = longest_ancestor_length(cwd, env_ceiling_dirs);
381 if (ceil_offset < 0 && has_dos_drive_prefix(cwd))
382 ceil_offset = 1;
383 /*
385 * Test in the following order (relative to the cwd):
386 * - .git (file containing "gitdir: <path>")
387 * - .git/
388 * - ./ (bare)
389 * - ../.git
390 * - ../.git/
391 * - ../ (bare)
392 * - ../../.git/
393 * etc.
394 */
395 offset = len = strlen(cwd);
396 one_filesystem = !git_env_bool("GIT_DISCOVERY_ACROSS_FILESYSTEM", 0);
397 if (one_filesystem) {
398 if (stat(".", &buf))
399 die_errno("failed to stat '.'");
400 current_device = buf.st_dev;
401 }
402 for (;;) {
403 gitfile_dir = read_gitfile_gently(DEFAULT_GIT_DIR_ENVIRONMENT);
404 if (gitfile_dir) {
405 if (set_git_dir(gitfile_dir))
406 die("Repository setup failed");
407 break;
408 }
409 if (is_git_directory(DEFAULT_GIT_DIR_ENVIRONMENT))
410 break;
411 if (is_git_directory(".")) {
412 inside_git_dir = 1;
413 if (!work_tree_env)
414 inside_work_tree = 0;
415 if (offset != len) {
416 root_len = offset_1st_component(cwd);
417 cwd[offset > root_len ? offset : root_len] = '\0';
418 set_git_dir(cwd);
419 } else
420 set_git_dir(".");
421 check_repository_format_gently(nongit_ok);
422 return NULL;
423 }
424 while (--offset > ceil_offset && cwd[offset] != '/');
425 if (offset <= ceil_offset) {
426 if (nongit_ok) {
427 if (chdir(cwd))
428 die_errno("Cannot come back to cwd");
429 *nongit_ok = 1;
430 return NULL;
431 }
432 die("Not a git repository (or any of the parent directories): %s", DEFAULT_GIT_DIR_ENVIRONMENT);
433 }
434 if (one_filesystem) {
435 if (stat("..", &buf)) {
436 cwd[offset] = '\0';
437 die_errno("failed to stat '%s/..'", cwd);
438 }
439 if (buf.st_dev != current_device) {
440 if (nongit_ok) {
441 if (chdir(cwd))
442 die_errno("Cannot come back to cwd");
443 *nongit_ok = 1;
444 return NULL;
445 }
446 cwd[offset] = '\0';
447 die("Not a git repository (or any parent up to mount parent %s)\n"
448 "Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).", cwd);
449 }
450 }
451 if (chdir("..")) {
452 cwd[offset] = '\0';
453 die_errno("Cannot change to '%s/..'", cwd);
454 }
455 }
456 inside_git_dir = 0;
458 if (!work_tree_env)
459 inside_work_tree = 1;
460 root_len = offset_1st_component(cwd);
461 git_work_tree_cfg = xstrndup(cwd, offset > root_len ? offset : root_len);
462 if (check_repository_format_gently(nongit_ok))
463 return NULL;
464 if (offset == len)
465 return NULL;
466 /* Make "offset" point to past the '/', and add a '/' at the end */
468 offset++;
469 cwd[len++] = '/';
470 cwd[len] = 0;
471 return cwd + offset;
472}
473int git_config_perm(const char *var, const char *value)
475{
476 int i;
477 char *endptr;
478 if (value == NULL)
480 return PERM_GROUP;
481 if (!strcmp(value, "umask"))
483 return PERM_UMASK;
484 if (!strcmp(value, "group"))
485 return PERM_GROUP;
486 if (!strcmp(value, "all") ||
487 !strcmp(value, "world") ||
488 !strcmp(value, "everybody"))
489 return PERM_EVERYBODY;
490 /* Parse octal numbers */
492 i = strtol(value, &endptr, 8);
493 /* If not an octal number, maybe true/false? */
495 if (*endptr != 0)
496 return git_config_bool(var, value) ? PERM_GROUP : PERM_UMASK;
497 /*
499 * Treat values 0, 1 and 2 as compatibility cases, otherwise it is
500 * a chmod value to restrict to.
501 */
502 switch (i) {
503 case PERM_UMASK: /* 0 */
504 return PERM_UMASK;
505 case OLD_PERM_GROUP: /* 1 */
506 return PERM_GROUP;
507 case OLD_PERM_EVERYBODY: /* 2 */
508 return PERM_EVERYBODY;
509 }
510 /* A filemode value was given: 0xxx */
512 if ((i & 0600) != 0600)
514 die("Problem with core.sharedRepository filemode value "
515 "(0%.3o).\nThe owner of files must always have "
516 "read and write permissions.", i);
517 /*
519 * Mask filemode value. Others can not get write permission.
520 * x flags for directories are handled separately.
521 */
522 return -(i & 0666);
523}
524int check_repository_format_version(const char *var, const char *value, void *cb)
526{
527 if (strcmp(var, "core.repositoryformatversion") == 0)
528 repository_format_version = git_config_int(var, value);
529 else if (strcmp(var, "core.sharedrepository") == 0)
530 shared_repository = git_config_perm(var, value);
531 else if (strcmp(var, "core.bare") == 0) {
532 is_bare_repository_cfg = git_config_bool(var, value);
533 if (is_bare_repository_cfg == 1)
534 inside_work_tree = -1;
535 } else if (strcmp(var, "core.worktree") == 0) {
536 if (!value)
537 return config_error_nonbool(var);
538 free(git_work_tree_cfg);
539 git_work_tree_cfg = xstrdup(value);
540 inside_work_tree = -1;
541 }
542 return 0;
543}
544int check_repository_format(void)
546{
547 return check_repository_format_gently(NULL);
548}
549/*
551 * Returns the "prefix", a path to the current working directory
552 * relative to the work tree root, or NULL, if the current working
553 * directory is not a strict subdirectory of the work tree root. The
554 * prefix always ends with a '/' character.
555 */
556const char *setup_git_directory(void)
557{
558 const char *retval = setup_git_directory_gently(NULL);
559 /* If the work tree is not the default one, recompute prefix */
561 if (inside_work_tree < 0) {
562 static char buffer[PATH_MAX + 1];
563 char *rel;
564 if (retval && chdir(retval))
565 die_errno ("Could not jump back into original cwd");
566 rel = get_relative_cwd(buffer, PATH_MAX, get_git_work_tree());
567 if (rel && *rel && chdir(get_git_work_tree()))
568 die_errno ("Could not jump to working directory");
569 return rel && *rel ? strcat(rel, "/") : NULL;
570 }
571 return retval;
573}