49a1a2525a871ba408146cd57e6b82cc43898f5e
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(const char *gitdir, int *nongit_ok)
247{
248 char repo_config[PATH_MAX+1];
249 /*
251 * git_config() can't be used here because it calls git_pathdup()
252 * to get $GIT_CONFIG/config. That call will make setup_git_env()
253 * set git_dir to ".git".
254 *
255 * We are in gitdir setup, no git dir has been found useable yet.
256 * Use a gentler version of git_config() to check if this repo
257 * is a good one.
258 */
259 snprintf(repo_config, PATH_MAX, "%s/config", gitdir);
260 git_config_early(check_repository_format_version, NULL, repo_config);
261 if (GIT_REPO_VERSION < repository_format_version) {
262 if (!nongit_ok)
263 die ("Expected git repo version <= %d, found %d",
264 GIT_REPO_VERSION, repository_format_version);
265 warning("Expected git repo version <= %d, found %d",
266 GIT_REPO_VERSION, repository_format_version);
267 warning("Please upgrade Git");
268 *nongit_ok = -1;
269 return -1;
270 }
271 return 0;
272}
273/*
275 * Try to read the location of the git directory from the .git file,
276 * return path to git directory if found.
277 */
278const char *read_gitfile_gently(const char *path)
279{
280 char *buf;
281 char *dir;
282 const char *slash;
283 struct stat st;
284 int fd;
285 size_t len;
286 if (stat(path, &st))
288 return NULL;
289 if (!S_ISREG(st.st_mode))
290 return NULL;
291 fd = open(path, O_RDONLY);
292 if (fd < 0)
293 die_errno("Error opening '%s'", path);
294 buf = xmalloc(st.st_size + 1);
295 len = read_in_full(fd, buf, st.st_size);
296 close(fd);
297 if (len != st.st_size)
298 die("Error reading %s", path);
299 buf[len] = '\0';
300 if (prefixcmp(buf, "gitdir: "))
301 die("Invalid gitfile format: %s", path);
302 while (buf[len - 1] == '\n' || buf[len - 1] == '\r')
303 len--;
304 if (len < 9)
305 die("No path in gitfile: %s", path);
306 buf[len] = '\0';
307 dir = buf + 8;
308 if (!is_absolute_path(dir) && (slash = strrchr(path, '/'))) {
310 size_t pathlen = slash+1 - path;
311 size_t dirlen = pathlen + len - 8;
312 dir = xmalloc(dirlen + 1);
313 strncpy(dir, path, pathlen);
314 strncpy(dir + pathlen, buf + 8, len - 8);
315 dir[dirlen] = '\0';
316 free(buf);
317 buf = dir;
318 }
319 if (!is_git_directory(dir))
321 die("Not a git repository: %s", dir);
322 path = make_absolute_path(dir);
323 free(buf);
325 return path;
326}
327static const char *setup_explicit_git_dir(const char *gitdirenv,
329 const char *work_tree_env, int *nongit_ok)
330{
331 static char buffer[1024 + 1];
332 const char *retval;
333 if (PATH_MAX - 40 < strlen(gitdirenv))
335 die("'$%s' too big", GIT_DIR_ENVIRONMENT);
336 if (!is_git_directory(gitdirenv)) {
337 if (nongit_ok) {
338 *nongit_ok = 1;
339 return NULL;
340 }
341 die("Not a git repository: '%s'", gitdirenv);
342 }
343 if (!work_tree_env) {
344 retval = set_work_tree(gitdirenv);
345 /* config may override worktree */
346 if (check_repository_format_gently(gitdirenv, nongit_ok))
347 return NULL;
348 return retval;
349 }
350 if (check_repository_format_gently(gitdirenv, nongit_ok))
351 return NULL;
352 retval = get_relative_cwd(buffer, sizeof(buffer) - 1,
353 get_git_work_tree());
354 if (!retval || !*retval)
355 return NULL;
356 set_git_dir(make_absolute_path(gitdirenv));
357 if (chdir(work_tree_env) < 0)
358 die_errno ("Could not chdir to '%s'", work_tree_env);
359 strcat(buffer, "/");
360 return retval;
361}
362static int cwd_contains_git_dir(const char **gitfile_dirp)
364{
365 const char *gitfile_dir = read_gitfile_gently(DEFAULT_GIT_DIR_ENVIRONMENT);
366 *gitfile_dirp = gitfile_dir;
367 if (gitfile_dir) {
368 if (set_git_dir(gitfile_dir))
369 die("Repository setup failed");
370 return 1;
371 }
372 if (is_git_directory(DEFAULT_GIT_DIR_ENVIRONMENT)) {
373 *gitfile_dirp = DEFAULT_GIT_DIR_ENVIRONMENT;
374 return 1;
375 }
376 return 0;
377}
378static const char *setup_discovered_git_dir(const char *work_tree_env,
380 const char *gitdir,
381 int offset, int len,
382 char *cwd, int *nongit_ok)
383{
384 int root_len;
385 inside_git_dir = 0;
387 if (!work_tree_env)
388 inside_work_tree = 1;
389 root_len = offset_1st_component(cwd);
390 git_work_tree_cfg = xstrndup(cwd, offset > root_len ? offset : root_len);
391 if (check_repository_format_gently(gitdir, nongit_ok))
392 return NULL;
393 if (offset == len)
394 return NULL;
395 /* Make "offset" point to past the '/', and add a '/' at the end */
397 offset++;
398 cwd[len++] = '/';
399 cwd[len] = 0;
400 return cwd + offset;
401}
402static const char *setup_bare_git_dir(const char *work_tree_env,
404 int offset, int len, char *cwd, int *nongit_ok)
405{
406 int root_len;
407 inside_git_dir = 1;
409 if (!work_tree_env)
410 inside_work_tree = 0;
411 if (offset != len) {
412 if (chdir(cwd))
413 die_errno("Cannot come back to cwd");
414 root_len = offset_1st_component(cwd);
415 cwd[offset > root_len ? offset : root_len] = '\0';
416 set_git_dir(cwd);
417 check_repository_format_gently(cwd, nongit_ok);
418 }
419 else {
420 set_git_dir(".");
421 check_repository_format_gently(".", nongit_ok);
422 }
423 return NULL;
424}
425static const char *setup_nongit(const char *cwd, int *nongit_ok)
427{
428 if (!nongit_ok)
429 die("Not a git repository (or any of the parent directories): %s", DEFAULT_GIT_DIR_ENVIRONMENT);
430 if (chdir(cwd))
431 die_errno("Cannot come back to cwd");
432 *nongit_ok = 1;
433 return NULL;
434}
435static dev_t get_device_or_die(const char *path, const char *prefix)
437{
438 struct stat buf;
439 if (stat(path, &buf))
440 die_errno("failed to stat '%s%s%s'",
441 prefix ? prefix : "",
442 prefix ? "/" : "", path);
443 return buf.st_dev;
444}
445/*
447 * We cannot decide in this function whether we are in the work tree or
448 * not, since the config can only be read _after_ this function was called.
449 */
450static const char *setup_git_directory_gently_1(int *nongit_ok)
451{
452 const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
453 const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT);
454 static char cwd[PATH_MAX+1];
455 const char *gitdirenv;
456 const char *gitfile_dir;
457 int len, offset, ceil_offset;
458 dev_t current_device = 0;
459 int one_filesystem = 1;
460 /*
462 * Let's assume that we are in a git repository.
463 * If it turns out later that we are somewhere else, the value will be
464 * updated accordingly.
465 */
466 if (nongit_ok)
467 *nongit_ok = 0;
468 /*
470 * If GIT_DIR is set explicitly, we're not going
471 * to do any discovery, but we still do repository
472 * validation.
473 */
474 gitdirenv = getenv(GIT_DIR_ENVIRONMENT);
475 if (gitdirenv)
476 return setup_explicit_git_dir(gitdirenv, work_tree_env, nongit_ok);
477 if (!getcwd(cwd, sizeof(cwd)-1))
479 die_errno("Unable to read current working directory");
480 ceil_offset = longest_ancestor_length(cwd, env_ceiling_dirs);
482 if (ceil_offset < 0 && has_dos_drive_prefix(cwd))
483 ceil_offset = 1;
484 /*
486 * Test in the following order (relative to the cwd):
487 * - .git (file containing "gitdir: <path>")
488 * - .git/
489 * - ./ (bare)
490 * - ../.git
491 * - ../.git/
492 * - ../ (bare)
493 * - ../../.git/
494 * etc.
495 */
496 offset = len = strlen(cwd);
497 one_filesystem = !git_env_bool("GIT_DISCOVERY_ACROSS_FILESYSTEM", 0);
498 if (one_filesystem)
499 current_device = get_device_or_die(".", NULL);
500 for (;;) {
501 if (cwd_contains_git_dir(&gitfile_dir))
502 return setup_discovered_git_dir(work_tree_env,
503 gitfile_dir,
504 offset, len,
505 cwd, nongit_ok);
506 if (is_git_directory("."))
507 return setup_bare_git_dir(work_tree_env, offset,
508 len, cwd, nongit_ok);
509 while (--offset > ceil_offset && cwd[offset] != '/');
510 if (offset <= ceil_offset)
511 return setup_nongit(cwd, nongit_ok);
512 if (one_filesystem) {
513 dev_t parent_device = get_device_or_die("..", cwd);
514 if (parent_device != current_device) {
515 if (nongit_ok) {
516 if (chdir(cwd))
517 die_errno("Cannot come back to cwd");
518 *nongit_ok = 1;
519 return NULL;
520 }
521 cwd[offset] = '\0';
522 die("Not a git repository (or any parent up to mount parent %s)\n"
523 "Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).", cwd);
524 }
525 }
526 if (chdir("..")) {
527 cwd[offset] = '\0';
528 die_errno("Cannot change to '%s/..'", cwd);
529 }
530 }
531}
532const char *setup_git_directory_gently(int *nongit_ok)
534{
535 const char *prefix;
536 prefix = setup_git_directory_gently_1(nongit_ok);
538 if (startup_info)
539 startup_info->have_repository = !nongit_ok || !*nongit_ok;
540 return prefix;
541}
542int git_config_perm(const char *var, const char *value)
544{
545 int i;
546 char *endptr;
547 if (value == NULL)
549 return PERM_GROUP;
550 if (!strcmp(value, "umask"))
552 return PERM_UMASK;
553 if (!strcmp(value, "group"))
554 return PERM_GROUP;
555 if (!strcmp(value, "all") ||
556 !strcmp(value, "world") ||
557 !strcmp(value, "everybody"))
558 return PERM_EVERYBODY;
559 /* Parse octal numbers */
561 i = strtol(value, &endptr, 8);
562 /* If not an octal number, maybe true/false? */
564 if (*endptr != 0)
565 return git_config_bool(var, value) ? PERM_GROUP : PERM_UMASK;
566 /*
568 * Treat values 0, 1 and 2 as compatibility cases, otherwise it is
569 * a chmod value to restrict to.
570 */
571 switch (i) {
572 case PERM_UMASK: /* 0 */
573 return PERM_UMASK;
574 case OLD_PERM_GROUP: /* 1 */
575 return PERM_GROUP;
576 case OLD_PERM_EVERYBODY: /* 2 */
577 return PERM_EVERYBODY;
578 }
579 /* A filemode value was given: 0xxx */
581 if ((i & 0600) != 0600)
583 die("Problem with core.sharedRepository filemode value "
584 "(0%.3o).\nThe owner of files must always have "
585 "read and write permissions.", i);
586 /*
588 * Mask filemode value. Others can not get write permission.
589 * x flags for directories are handled separately.
590 */
591 return -(i & 0666);
592}
593int check_repository_format_version(const char *var, const char *value, void *cb)
595{
596 if (strcmp(var, "core.repositoryformatversion") == 0)
597 repository_format_version = git_config_int(var, value);
598 else if (strcmp(var, "core.sharedrepository") == 0)
599 shared_repository = git_config_perm(var, value);
600 else if (strcmp(var, "core.bare") == 0) {
601 is_bare_repository_cfg = git_config_bool(var, value);
602 if (is_bare_repository_cfg == 1)
603 inside_work_tree = -1;
604 } else if (strcmp(var, "core.worktree") == 0) {
605 if (!value)
606 return config_error_nonbool(var);
607 free(git_work_tree_cfg);
608 git_work_tree_cfg = xstrdup(value);
609 inside_work_tree = -1;
610 }
611 return 0;
612}
613int check_repository_format(void)
615{
616 return check_repository_format_gently(get_git_dir(), NULL);
617}
618/*
620 * Returns the "prefix", a path to the current working directory
621 * relative to the work tree root, or NULL, if the current working
622 * directory is not a strict subdirectory of the work tree root. The
623 * prefix always ends with a '/' character.
624 */
625const char *setup_git_directory(void)
626{
627 const char *retval = setup_git_directory_gently(NULL);
628 /* If the work tree is not the default one, recompute prefix */
630 if (inside_work_tree < 0) {
631 static char buffer[PATH_MAX + 1];
632 char *rel;
633 if (retval && chdir(retval))
634 die_errno ("Could not jump back into original cwd");
635 rel = get_relative_cwd(buffer, PATH_MAX, get_git_work_tree());
636 if (rel && *rel && chdir(get_git_work_tree()))
637 die_errno ("Could not jump to working directory");
638 return rel && *rel ? strcat(rel, "/") : NULL;
639 }
640 return retval;
642}