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 if (PATH_MAX <= len + strlen("/objects"))
174 die("Too long path: %.*s", 60, suspect);
175 strcpy(path, suspect);
176 if (getenv(DB_ENVIRONMENT)) {
177 if (access(getenv(DB_ENVIRONMENT), X_OK))
178 return 0;
179 }
180 else {
181 strcpy(path + len, "/objects");
182 if (access(path, X_OK))
183 return 0;
184 }
185 strcpy(path + len, "/refs");
187 if (access(path, X_OK))
188 return 0;
189 strcpy(path + len, "/HEAD");
191 if (validate_headref(path))
192 return 0;
193 return 1;
195}
196int is_inside_git_dir(void)
198{
199 if (inside_git_dir < 0)
200 inside_git_dir = is_inside_dir(get_git_dir());
201 return inside_git_dir;
202}
203int is_inside_work_tree(void)
205{
206 if (inside_work_tree < 0)
207 inside_work_tree = is_inside_dir(get_git_work_tree());
208 return inside_work_tree;
209}
210/*
212 * set_work_tree() is only ever called if you set GIT_DIR explicitly.
213 * The old behaviour (which we retain here) is to set the work tree root
214 * to the cwd, unless overridden by the config, the command line, or
215 * GIT_WORK_TREE.
216 */
217static const char *set_work_tree(const char *dir)
218{
219 char buffer[PATH_MAX + 1];
220 if (!getcwd(buffer, sizeof(buffer)))
222 die ("Could not get the current working directory");
223 git_work_tree_cfg = xstrdup(buffer);
224 inside_work_tree = 1;
225 return NULL;
227}
228void setup_work_tree(void)
230{
231 const char *work_tree, *git_dir;
232 static int initialized = 0;
233 if (initialized)
235 return;
236 work_tree = get_git_work_tree();
237 git_dir = get_git_dir();
238 if (!is_absolute_path(git_dir))
239 git_dir = make_absolute_path(git_dir);
240 if (!work_tree || chdir(work_tree))
241 die("This operation must be run in a work tree");
242 set_git_dir(make_relative_path(git_dir, work_tree));
243 initialized = 1;
244}
245static int check_repository_format_gently(int *nongit_ok)
247{
248 git_config(check_repository_format_version, NULL);
249 if (GIT_REPO_VERSION < repository_format_version) {
250 if (!nongit_ok)
251 die ("Expected git repo version <= %d, found %d",
252 GIT_REPO_VERSION, repository_format_version);
253 warning("Expected git repo version <= %d, found %d",
254 GIT_REPO_VERSION, repository_format_version);
255 warning("Please upgrade Git");
256 *nongit_ok = -1;
257 return -1;
258 }
259 return 0;
260}
261/*
263 * Try to read the location of the git directory from the .git file,
264 * return path to git directory if found.
265 */
266const char *read_gitfile_gently(const char *path)
267{
268 char *buf;
269 char *dir;
270 const char *slash;
271 struct stat st;
272 int fd;
273 size_t len;
274 if (stat(path, &st))
276 return NULL;
277 if (!S_ISREG(st.st_mode))
278 return NULL;
279 fd = open(path, O_RDONLY);
280 if (fd < 0)
281 die_errno("Error opening '%s'", path);
282 buf = xmalloc(st.st_size + 1);
283 len = read_in_full(fd, buf, st.st_size);
284 close(fd);
285 if (len != st.st_size)
286 die("Error reading %s", path);
287 buf[len] = '\0';
288 if (prefixcmp(buf, "gitdir: "))
289 die("Invalid gitfile format: %s", path);
290 while (buf[len - 1] == '\n' || buf[len - 1] == '\r')
291 len--;
292 if (len < 9)
293 die("No path in gitfile: %s", path);
294 buf[len] = '\0';
295 dir = buf + 8;
296 if (!is_absolute_path(dir) && (slash = strrchr(path, '/'))) {
298 size_t pathlen = slash+1 - path;
299 size_t dirlen = pathlen + len - 8;
300 dir = xmalloc(dirlen + 1);
301 strncpy(dir, path, pathlen);
302 strncpy(dir + pathlen, buf + 8, len - 8);
303 dir[dirlen] = '\0';
304 free(buf);
305 buf = dir;
306 }
307 if (!is_git_directory(dir))
309 die("Not a git repository: %s", dir);
310 path = make_absolute_path(dir);
311 free(buf);
313 return path;
314}
315static const char *setup_explicit_git_dir(const char *gitdirenv,
317 const char *work_tree_env, int *nongit_ok)
318{
319 static char buffer[1024 + 1];
320 const char *retval;
321 if (PATH_MAX - 40 < strlen(gitdirenv))
323 die("'$%s' too big", GIT_DIR_ENVIRONMENT);
324 if (!is_git_directory(gitdirenv)) {
325 if (nongit_ok) {
326 *nongit_ok = 1;
327 return NULL;
328 }
329 die("Not a git repository: '%s'", gitdirenv);
330 }
331 if (!work_tree_env) {
332 retval = set_work_tree(gitdirenv);
333 /* config may override worktree */
334 if (check_repository_format_gently(nongit_ok))
335 return NULL;
336 return retval;
337 }
338 if (check_repository_format_gently(nongit_ok))
339 return NULL;
340 retval = get_relative_cwd(buffer, sizeof(buffer) - 1,
341 get_git_work_tree());
342 if (!retval || !*retval)
343 return NULL;
344 set_git_dir(make_absolute_path(gitdirenv));
345 if (chdir(work_tree_env) < 0)
346 die_errno ("Could not chdir to '%s'", work_tree_env);
347 strcat(buffer, "/");
348 return retval;
349}
350static int cwd_contains_git_dir(const char **gitfile_dirp)
352{
353 const char *gitfile_dir = read_gitfile_gently(DEFAULT_GIT_DIR_ENVIRONMENT);
354 *gitfile_dirp = gitfile_dir;
355 if (gitfile_dir) {
356 if (set_git_dir(gitfile_dir))
357 die("Repository setup failed");
358 return 1;
359 }
360 return is_git_directory(DEFAULT_GIT_DIR_ENVIRONMENT);
361}
362static const char *setup_discovered_git_dir(const char *work_tree_env,
364 int offset, int len, char *cwd, int *nongit_ok)
365{
366 int root_len;
367 inside_git_dir = 0;
369 if (!work_tree_env)
370 inside_work_tree = 1;
371 root_len = offset_1st_component(cwd);
372 git_work_tree_cfg = xstrndup(cwd, offset > root_len ? offset : root_len);
373 if (check_repository_format_gently(nongit_ok))
374 return NULL;
375 if (offset == len)
376 return NULL;
377 /* Make "offset" point to past the '/', and add a '/' at the end */
379 offset++;
380 cwd[len++] = '/';
381 cwd[len] = 0;
382 return cwd + offset;
383}
384static const char *setup_bare_git_dir(const char *work_tree_env,
386 int offset, int len, char *cwd, int *nongit_ok)
387{
388 int root_len;
389 inside_git_dir = 1;
391 if (!work_tree_env)
392 inside_work_tree = 0;
393 if (offset != len) {
394 if (chdir(cwd))
395 die_errno("Cannot come back to cwd");
396 root_len = offset_1st_component(cwd);
397 cwd[offset > root_len ? offset : root_len] = '\0';
398 set_git_dir(cwd);
399 } else
400 set_git_dir(".");
401 check_repository_format_gently(nongit_ok);
402 return NULL;
403}
404static const char *setup_nongit(const char *cwd, int *nongit_ok)
406{
407 if (!nongit_ok)
408 die("Not a git repository (or any of the parent directories): %s", DEFAULT_GIT_DIR_ENVIRONMENT);
409 if (chdir(cwd))
410 die_errno("Cannot come back to cwd");
411 *nongit_ok = 1;
412 return NULL;
413}
414static dev_t get_device_or_die(const char *path, const char *prefix)
416{
417 struct stat buf;
418 if (stat(path, &buf))
419 die_errno("failed to stat '%s%s%s'",
420 prefix ? prefix : "",
421 prefix ? "/" : "", path);
422 return buf.st_dev;
423}
424/*
426 * We cannot decide in this function whether we are in the work tree or
427 * not, since the config can only be read _after_ this function was called.
428 */
429static const char *setup_git_directory_gently_1(int *nongit_ok)
430{
431 const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
432 const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT);
433 static char cwd[PATH_MAX+1];
434 const char *gitdirenv;
435 const char *gitfile_dir;
436 int len, offset, ceil_offset;
437 dev_t current_device = 0;
438 int one_filesystem = 1;
439 /*
441 * Let's assume that we are in a git repository.
442 * If it turns out later that we are somewhere else, the value will be
443 * updated accordingly.
444 */
445 if (nongit_ok)
446 *nongit_ok = 0;
447 /*
449 * If GIT_DIR is set explicitly, we're not going
450 * to do any discovery, but we still do repository
451 * validation.
452 */
453 gitdirenv = getenv(GIT_DIR_ENVIRONMENT);
454 if (gitdirenv)
455 return setup_explicit_git_dir(gitdirenv, work_tree_env, nongit_ok);
456 if (!getcwd(cwd, sizeof(cwd)-1))
458 die_errno("Unable to read current working directory");
459 ceil_offset = longest_ancestor_length(cwd, env_ceiling_dirs);
461 if (ceil_offset < 0 && has_dos_drive_prefix(cwd))
462 ceil_offset = 1;
463 /*
465 * Test in the following order (relative to the cwd):
466 * - .git (file containing "gitdir: <path>")
467 * - .git/
468 * - ./ (bare)
469 * - ../.git
470 * - ../.git/
471 * - ../ (bare)
472 * - ../../.git/
473 * etc.
474 */
475 offset = len = strlen(cwd);
476 one_filesystem = !git_env_bool("GIT_DISCOVERY_ACROSS_FILESYSTEM", 0);
477 if (one_filesystem)
478 current_device = get_device_or_die(".", NULL);
479 for (;;) {
480 if (cwd_contains_git_dir(&gitfile_dir))
481 return setup_discovered_git_dir(work_tree_env, offset,
482 len, cwd, nongit_ok);
483 if (is_git_directory("."))
484 return setup_bare_git_dir(work_tree_env, offset,
485 len, cwd, nongit_ok);
486 while (--offset > ceil_offset && cwd[offset] != '/');
487 if (offset <= ceil_offset)
488 return setup_nongit(cwd, nongit_ok);
489 if (one_filesystem) {
490 dev_t parent_device = get_device_or_die("..", cwd);
491 if (parent_device != current_device) {
492 if (nongit_ok) {
493 if (chdir(cwd))
494 die_errno("Cannot come back to cwd");
495 *nongit_ok = 1;
496 return NULL;
497 }
498 cwd[offset] = '\0';
499 die("Not a git repository (or any parent up to mount parent %s)\n"
500 "Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).", cwd);
501 }
502 }
503 if (chdir("..")) {
504 cwd[offset] = '\0';
505 die_errno("Cannot change to '%s/..'", cwd);
506 }
507 }
508}
509const char *setup_git_directory_gently(int *nongit_ok)
511{
512 const char *prefix;
513 prefix = setup_git_directory_gently_1(nongit_ok);
515 if (startup_info)
516 startup_info->have_repository = !nongit_ok || !*nongit_ok;
517 return prefix;
518}
519int git_config_perm(const char *var, const char *value)
521{
522 int i;
523 char *endptr;
524 if (value == NULL)
526 return PERM_GROUP;
527 if (!strcmp(value, "umask"))
529 return PERM_UMASK;
530 if (!strcmp(value, "group"))
531 return PERM_GROUP;
532 if (!strcmp(value, "all") ||
533 !strcmp(value, "world") ||
534 !strcmp(value, "everybody"))
535 return PERM_EVERYBODY;
536 /* Parse octal numbers */
538 i = strtol(value, &endptr, 8);
539 /* If not an octal number, maybe true/false? */
541 if (*endptr != 0)
542 return git_config_bool(var, value) ? PERM_GROUP : PERM_UMASK;
543 /*
545 * Treat values 0, 1 and 2 as compatibility cases, otherwise it is
546 * a chmod value to restrict to.
547 */
548 switch (i) {
549 case PERM_UMASK: /* 0 */
550 return PERM_UMASK;
551 case OLD_PERM_GROUP: /* 1 */
552 return PERM_GROUP;
553 case OLD_PERM_EVERYBODY: /* 2 */
554 return PERM_EVERYBODY;
555 }
556 /* A filemode value was given: 0xxx */
558 if ((i & 0600) != 0600)
560 die("Problem with core.sharedRepository filemode value "
561 "(0%.3o).\nThe owner of files must always have "
562 "read and write permissions.", i);
563 /*
565 * Mask filemode value. Others can not get write permission.
566 * x flags for directories are handled separately.
567 */
568 return -(i & 0666);
569}
570int check_repository_format_version(const char *var, const char *value, void *cb)
572{
573 if (strcmp(var, "core.repositoryformatversion") == 0)
574 repository_format_version = git_config_int(var, value);
575 else if (strcmp(var, "core.sharedrepository") == 0)
576 shared_repository = git_config_perm(var, value);
577 else if (strcmp(var, "core.bare") == 0) {
578 is_bare_repository_cfg = git_config_bool(var, value);
579 if (is_bare_repository_cfg == 1)
580 inside_work_tree = -1;
581 } else if (strcmp(var, "core.worktree") == 0) {
582 if (!value)
583 return config_error_nonbool(var);
584 free(git_work_tree_cfg);
585 git_work_tree_cfg = xstrdup(value);
586 inside_work_tree = -1;
587 }
588 return 0;
589}
590int check_repository_format(void)
592{
593 return check_repository_format_gently(NULL);
594}
595/*
597 * Returns the "prefix", a path to the current working directory
598 * relative to the work tree root, or NULL, if the current working
599 * directory is not a strict subdirectory of the work tree root. The
600 * prefix always ends with a '/' character.
601 */
602const char *setup_git_directory(void)
603{
604 const char *retval = setup_git_directory_gently(NULL);
605 /* If the work tree is not the default one, recompute prefix */
607 if (inside_work_tree < 0) {
608 static char buffer[PATH_MAX + 1];
609 char *rel;
610 if (retval && chdir(retval))
611 die_errno ("Could not jump back into original cwd");
612 rel = get_relative_cwd(buffer, PATH_MAX, get_git_work_tree());
613 if (rel && *rel && chdir(get_git_work_tree()))
614 die_errno ("Could not jump to working directory");
615 return rel && *rel ? strcat(rel, "/") : NULL;
616 }
617 return retval;
619}