setup.c: detect $GIT_COMMON_DIR check_repository_format_gently()
[git/git.git] / setup.c
CommitLineData
d288a700 1#include "cache.h"
e90fdc39 2#include "dir.h"
31171d9e 3#include "string-list.h"
e90fdc39
JS
4
5static int inside_git_dir = -1;
6static int inside_work_tree = -1;
d288a700 7
ddc2a628
MEW
8/*
9 * The input parameter must contain an absolute path, and it must already be
10 * normalized.
11 *
12 * Find the part of an absolute path that lies inside the work tree by
13 * dereferencing symlinks outside the work tree, for example:
14 * /dir1/repo/dir2/file (work tree is /dir1/repo) -> dir2/file
15 * /dir/file (work tree is /) -> dir/file
16 * /dir/symlink1/symlink2 (symlink1 points to work tree) -> symlink2
17 * /dir/repolink/file (repolink points to /dir/repo) -> file
18 * /dir/repo (exactly equal to work tree) -> (empty string)
19 */
20static int abspath_part_inside_repo(char *path)
21{
22 size_t len;
23 size_t wtlen;
24 char *path0;
25 int off;
26 const char *work_tree = get_git_work_tree();
27
28 if (!work_tree)
29 return -1;
30 wtlen = strlen(work_tree);
31 len = strlen(path);
6127ff63 32 off = offset_1st_component(path);
ddc2a628
MEW
33
34 /* check if work tree is already the prefix */
35 if (wtlen <= len && !strncmp(path, work_tree, wtlen)) {
36 if (path[wtlen] == '/') {
37 memmove(path, path + wtlen + 1, len - wtlen);
38 return 0;
39 } else if (path[wtlen - 1] == '/' || path[wtlen] == '\0') {
40 /* work tree is the root, or the whole path */
41 memmove(path, path + wtlen, len - wtlen + 1);
42 return 0;
43 }
44 /* work tree might match beginning of a symlink to work tree */
45 off = wtlen;
46 }
47 path0 = path;
6127ff63 48 path += off;
ddc2a628
MEW
49
50 /* check each '/'-terminated level */
51 while (*path) {
52 path++;
53 if (*path == '/') {
54 *path = '\0';
55 if (strcmp(real_path(path0), work_tree) == 0) {
56 memmove(path0, path + 1, len - (path - path0));
57 return 0;
58 }
59 *path = '/';
60 }
61 }
62
63 /* check whole path */
64 if (strcmp(real_path(path0), work_tree) == 0) {
65 *path0 = '\0';
66 return 0;
67 }
68
69 return -1;
70}
71
645a29c4
NTND
72/*
73 * Normalize "path", prepending the "prefix" for relative paths. If
74 * remaining_prefix is not NULL, return the actual prefix still
75 * remains in the path. For example, prefix = sub1/sub2/ and path is
76 *
77 * foo -> sub1/sub2/foo (full prefix)
78 * ../foo -> sub1/foo (remaining prefix is sub1/)
79 * ../../bar -> bar (no remaining prefix)
80 * ../../sub1/sub2/foo -> sub1/sub2/foo (but no remaining prefix)
81 * `pwd`/../bar -> sub1/bar (no remaining prefix)
82 */
83char *prefix_path_gently(const char *prefix, int len,
84 int *remaining_prefix, const char *path)
d089ebaa
JH
85{
86 const char *orig = path;
18e051a3
CMAB
87 char *sanitized;
88 if (is_absolute_path(orig)) {
655ee9ea 89 sanitized = xmalloc(strlen(path) + 1);
645a29c4
NTND
90 if (remaining_prefix)
91 *remaining_prefix = 0;
655ee9ea
MEW
92 if (normalize_path_copy_len(sanitized, path, remaining_prefix)) {
93 free(sanitized);
94 return NULL;
95 }
96 if (abspath_part_inside_repo(sanitized)) {
97 free(sanitized);
98 return NULL;
99 }
18e051a3
CMAB
100 } else {
101 sanitized = xmalloc(len + strlen(path) + 1);
d089ebaa
JH
102 if (len)
103 memcpy(sanitized, prefix, len);
104 strcpy(sanitized + len, path);
645a29c4
NTND
105 if (remaining_prefix)
106 *remaining_prefix = len;
655ee9ea 107 if (normalize_path_copy_len(sanitized, sanitized, remaining_prefix)) {
546e0fd9
JK
108 free(sanitized);
109 return NULL;
d089ebaa 110 }
d089ebaa
JH
111 }
112 return sanitized;
f332726e
LT
113}
114
546e0fd9
JK
115char *prefix_path(const char *prefix, int len, const char *path)
116{
645a29c4 117 char *r = prefix_path_gently(prefix, len, NULL, path);
546e0fd9
JK
118 if (!r)
119 die("'%s' is outside repository", path);
120 return r;
121}
122
123int path_inside_repo(const char *prefix, const char *path)
124{
125 int len = prefix ? strlen(prefix) : 0;
645a29c4 126 char *r = prefix_path_gently(prefix, len, NULL, path);
546e0fd9
JK
127 if (r) {
128 free(r);
129 return 1;
130 }
131 return 0;
132}
133
c6e8c800
JH
134int check_filename(const char *prefix, const char *arg)
135{
136 const char *name;
137 struct stat st;
138
59556548 139 if (starts_with(arg, ":/")) {
4db86e8b
NTND
140 if (arg[2] == '\0') /* ":/" is root dir, always exists */
141 return 1;
142 name = arg + 2;
143 } else if (prefix)
144 name = prefix_filename(prefix, strlen(prefix), arg);
145 else
146 name = arg;
c6e8c800
JH
147 if (!lstat(name, &st))
148 return 1; /* file exists */
149 if (errno == ENOENT || errno == ENOTDIR)
150 return 0; /* file does not exist */
151 die_errno("failed to stat '%s'", arg);
152}
153
023e37c3
MM
154static void NORETURN die_verify_filename(const char *prefix,
155 const char *arg,
156 int diagnose_misspelt_rev)
009fee47 157{
023e37c3
MM
158 if (!diagnose_misspelt_rev)
159 die("%s: no such path in the working tree.\n"
4d4b5739 160 "Use 'git <command> -- <path>...' to specify paths that do not exist locally.",
023e37c3 161 arg);
0e539dca
JH
162 /*
163 * Saying "'(icase)foo' does not exist in the index" when the
164 * user gave us ":(icase)foo" is just stupid. A magic pathspec
165 * begins with a colon and is followed by a non-alnum; do not
8c135ea2 166 * let maybe_die_on_misspelt_object_name() even trigger.
0e539dca
JH
167 */
168 if (!(arg[0] == ':' && !isalnum(arg[1])))
8c135ea2 169 maybe_die_on_misspelt_object_name(arg, prefix);
0e539dca 170
009fee47
MM
171 /* ... or fall back the most general message. */
172 die("ambiguous argument '%s': unknown revision or path not in the working tree.\n"
4d4b5739
MM
173 "Use '--' to separate paths from revisions, like this:\n"
174 "'git <command> [<revision>...] -- [<file>...]'", arg);
009fee47
MM
175
176}
177
e23d0b4a
LT
178/*
179 * Verify a filename that we got as an argument for a pathspec
180 * entry. Note that a filename that begins with "-" never verifies
181 * as true, because even if such a filename were to exist, we want
182 * it to be preceded by the "--" marker (or we want the user to
183 * use a format like "./-filename")
023e37c3
MM
184 *
185 * The "diagnose_misspelt_rev" is used to provide a user-friendly
186 * diagnosis when dying upon finding that "name" is not a pathname.
187 * If set to 1, the diagnosis will try to diagnose "name" as an
188 * invalid object name (e.g. HEAD:foo). If set to 0, the diagnosis
189 * will only complain about an inexisting file.
190 *
191 * This function is typically called to check that a "file or rev"
192 * argument is unambiguous. In this case, the caller will want
193 * diagnose_misspelt_rev == 1 when verifying the first non-rev
194 * argument (which could have been a revision), and
195 * diagnose_misspelt_rev == 0 for the next ones (because we already
196 * saw a filename, there's not ambiguity anymore).
e23d0b4a 197 */
023e37c3
MM
198void verify_filename(const char *prefix,
199 const char *arg,
200 int diagnose_misspelt_rev)
e23d0b4a 201{
e23d0b4a
LT
202 if (*arg == '-')
203 die("bad flag '%s' used after filename", arg);
c6e8c800 204 if (check_filename(prefix, arg))
e23d0b4a 205 return;
023e37c3 206 die_verify_filename(prefix, arg, diagnose_misspelt_rev);
e23d0b4a
LT
207}
208
ea92f41f
JH
209/*
210 * Opposite of the above: the command line did not have -- marker
211 * and we parsed the arg as a refname. It should not be interpretable
212 * as a filename.
213 */
214void verify_non_filename(const char *prefix, const char *arg)
215{
7ae3df8c 216 if (!is_inside_work_tree() || is_inside_git_dir())
68025633 217 return;
ea92f41f
JH
218 if (*arg == '-')
219 return; /* flag */
c6e8c800
JH
220 if (!check_filename(prefix, arg))
221 return;
222 die("ambiguous argument '%s': both revision and filename\n"
4d4b5739
MM
223 "Use '--' to separate paths from revisions, like this:\n"
224 "'git <command> [<revision>...] -- [<file>...]'", arg);
ea92f41f
JH
225}
226
4dc4e145
NTND
227static void get_common_dir(struct strbuf *sb, const char *gitdir)
228{
229 struct strbuf data = STRBUF_INIT;
230 struct strbuf path = STRBUF_INIT;
231 const char *git_common_dir = getenv(GIT_COMMON_DIR_ENVIRONMENT);
232 if (git_common_dir) {
233 strbuf_addstr(sb, git_common_dir);
234 return;
235 }
236 strbuf_addf(&path, "%s/commondir", gitdir);
237 if (file_exists(path.buf)) {
238 if (strbuf_read_file(&data, path.buf, 0) <= 0)
239 die_errno(_("failed to read %s"), path.buf);
240 while (data.len && (data.buf[data.len - 1] == '\n' ||
241 data.buf[data.len - 1] == '\r'))
242 data.len--;
243 data.buf[data.len] = '\0';
244 strbuf_reset(&path);
245 if (!is_absolute_path(data.buf))
246 strbuf_addf(&path, "%s/", gitdir);
247 strbuf_addbuf(&path, &data);
248 strbuf_addstr(sb, real_path(path.buf));
249 } else
250 strbuf_addstr(sb, gitdir);
251 strbuf_release(&data);
252 strbuf_release(&path);
253}
d288a700 254
5f5608bc 255/*
ad1a382f 256 * Test if it looks like we're at a git directory.
5e7bfe25 257 * We want to see:
5f5608bc 258 *
790296fd 259 * - either an objects/ directory _or_ the proper
5f5608bc 260 * GIT_OBJECT_DIRECTORY environment variable
ad1a382f 261 * - a refs/ directory
8098a178 262 * - either a HEAD symlink or a HEAD file that is formatted as
c847f537
JH
263 * a proper "ref:", or a regular file HEAD that has a properly
264 * formatted sha1 object name.
5f5608bc 265 */
b3256eb8 266int is_git_directory(const char *suspect)
5f5608bc 267{
1d186b6f
NTND
268 struct strbuf path = STRBUF_INIT;
269 int ret = 0;
270 size_t len;
ad1a382f 271
4dc4e145
NTND
272 /* Check worktree-related signatures */
273 strbuf_addf(&path, "%s/HEAD", suspect);
274 if (validate_headref(path.buf))
275 goto done;
276
277 strbuf_reset(&path);
278 get_common_dir(&path, suspect);
1d186b6f 279 len = path.len;
4dc4e145
NTND
280
281 /* Check non-worktree-related signatures */
ad1a382f
SP
282 if (getenv(DB_ENVIRONMENT)) {
283 if (access(getenv(DB_ENVIRONMENT), X_OK))
1d186b6f 284 goto done;
ad1a382f
SP
285 }
286 else {
4dc4e145 287 strbuf_setlen(&path, len);
1d186b6f
NTND
288 strbuf_addstr(&path, "/objects");
289 if (access(path.buf, X_OK))
290 goto done;
ad1a382f
SP
291 }
292
1d186b6f
NTND
293 strbuf_setlen(&path, len);
294 strbuf_addstr(&path, "/refs");
295 if (access(path.buf, X_OK))
296 goto done;
ad1a382f 297
1d186b6f
NTND
298 ret = 1;
299done:
300 strbuf_release(&path);
301 return ret;
5f5608bc
LT
302}
303
68025633
JS
304int is_inside_git_dir(void)
305{
e90fdc39
JS
306 if (inside_git_dir < 0)
307 inside_git_dir = is_inside_dir(get_git_dir());
308 return inside_git_dir;
892c41b9
ML
309}
310
892c41b9
ML
311int is_inside_work_tree(void)
312{
e90fdc39
JS
313 if (inside_work_tree < 0)
314 inside_work_tree = is_inside_dir(get_git_work_tree());
315 return inside_work_tree;
892c41b9
ML
316}
317
f3fa1838
JH
318void setup_work_tree(void)
319{
354e6534
JS
320 const char *work_tree, *git_dir;
321 static int initialized = 0;
322
323 if (initialized)
324 return;
325 work_tree = get_git_work_tree();
326 git_dir = get_git_dir();
59f0f2f3 327 if (!is_absolute_path(git_dir))
e2a57aac 328 git_dir = real_path(get_git_dir());
59f0f2f3
MH
329 if (!work_tree || chdir(work_tree))
330 die("This operation must be run in a work tree");
0ed74813
NTND
331
332 /*
333 * Make sure subsequent git processes find correct worktree
334 * if $GIT_WORK_TREE is set relative
335 */
336 if (getenv(GIT_WORK_TREE_ENVIRONMENT))
337 setenv(GIT_WORK_TREE_ENVIRONMENT, ".", 1);
338
41894ae3 339 set_git_dir(remove_leading_path(git_dir, work_tree));
354e6534 340 initialized = 1;
59f0f2f3
MH
341}
342
337e51ce 343static int check_repository_format_gently(const char *gitdir, int *nongit_ok)
9459aa77 344{
7d0fb0da
NTND
345 struct strbuf sb = STRBUF_INIT;
346 const char *repo_config;
347 int ret = 0;
337e51ce 348
e61a509a
NTND
349 get_common_dir(&sb, gitdir);
350 strbuf_addstr(&sb, "/config");
351 repo_config = sb.buf;
352
337e51ce
NTND
353 /*
354 * git_config() can't be used here because it calls git_pathdup()
355 * to get $GIT_CONFIG/config. That call will make setup_git_env()
356 * set git_dir to ".git".
357 *
358 * We are in gitdir setup, no git dir has been found useable yet.
359 * Use a gentler version of git_config() to check if this repo
360 * is a good one.
361 */
337e51ce 362 git_config_early(check_repository_format_version, NULL, repo_config);
9459aa77
NTND
363 if (GIT_REPO_VERSION < repository_format_version) {
364 if (!nongit_ok)
365 die ("Expected git repo version <= %d, found %d",
366 GIT_REPO_VERSION, repository_format_version);
367 warning("Expected git repo version <= %d, found %d",
368 GIT_REPO_VERSION, repository_format_version);
369 warning("Please upgrade Git");
370 *nongit_ok = -1;
7d0fb0da 371 ret = -1;
9459aa77 372 }
7d0fb0da
NTND
373 strbuf_release(&sb);
374 return ret;
9459aa77
NTND
375}
376
b44ebb19
LH
377/*
378 * Try to read the location of the git directory from the .git file,
379 * return path to git directory if found.
380 */
13d6ec91 381const char *read_gitfile(const char *path)
b44ebb19
LH
382{
383 char *buf;
40c813e0
BK
384 char *dir;
385 const char *slash;
b44ebb19
LH
386 struct stat st;
387 int fd;
b1905aea 388 ssize_t len;
b44ebb19
LH
389
390 if (stat(path, &st))
391 return NULL;
392 if (!S_ISREG(st.st_mode))
393 return NULL;
394 fd = open(path, O_RDONLY);
395 if (fd < 0)
d824cbba 396 die_errno("Error opening '%s'", path);
b44ebb19
LH
397 buf = xmalloc(st.st_size + 1);
398 len = read_in_full(fd, buf, st.st_size);
399 close(fd);
400 if (len != st.st_size)
401 die("Error reading %s", path);
402 buf[len] = '\0';
59556548 403 if (!starts_with(buf, "gitdir: "))
b44ebb19
LH
404 die("Invalid gitfile format: %s", path);
405 while (buf[len - 1] == '\n' || buf[len - 1] == '\r')
406 len--;
407 if (len < 9)
408 die("No path in gitfile: %s", path);
409 buf[len] = '\0';
40c813e0
BK
410 dir = buf + 8;
411
412 if (!is_absolute_path(dir) && (slash = strrchr(path, '/'))) {
413 size_t pathlen = slash+1 - path;
414 size_t dirlen = pathlen + len - 8;
415 dir = xmalloc(dirlen + 1);
416 strncpy(dir, path, pathlen);
417 strncpy(dir + pathlen, buf + 8, len - 8);
418 dir[dirlen] = '\0';
419 free(buf);
420 buf = dir;
421 }
422
423 if (!is_git_directory(dir))
424 die("Not a git repository: %s", dir);
e2a57aac 425 path = real_path(dir);
40c813e0 426
b44ebb19
LH
427 free(buf);
428 return path;
429}
430
e4e30347 431static const char *setup_explicit_git_dir(const char *gitdirenv,
7333ed17 432 struct strbuf *cwd,
b3f66fd3 433 int *nongit_ok)
e4e30347 434{
b3f66fd3
NTND
435 const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
436 const char *worktree;
437 char *gitfile;
9b125da4 438 int offset;
e4e30347
JN
439
440 if (PATH_MAX - 40 < strlen(gitdirenv))
441 die("'$%s' too big", GIT_DIR_ENVIRONMENT);
b3f66fd3 442
13d6ec91 443 gitfile = (char*)read_gitfile(gitdirenv);
b3f66fd3
NTND
444 if (gitfile) {
445 gitfile = xstrdup(gitfile);
446 gitdirenv = gitfile;
447 }
448
e4e30347
JN
449 if (!is_git_directory(gitdirenv)) {
450 if (nongit_ok) {
451 *nongit_ok = 1;
b3f66fd3 452 free(gitfile);
e4e30347
JN
453 return NULL;
454 }
455 die("Not a git repository: '%s'", gitdirenv);
456 }
b3f66fd3
NTND
457
458 if (check_repository_format_gently(gitdirenv, nongit_ok)) {
459 free(gitfile);
460 return NULL;
e4e30347 461 }
b3f66fd3
NTND
462
463 /* #3, #7, #11, #15, #19, #23, #27, #31 (see t1510) */
464 if (work_tree_env)
465 set_git_work_tree(work_tree_env);
466 else if (is_bare_repository_cfg > 0) {
467 if (git_work_tree_cfg) /* #22.2, #30 */
468 die("core.bare and core.worktree do not make sense");
469
470 /* #18, #26 */
471 set_git_dir(gitdirenv);
472 free(gitfile);
e4e30347 473 return NULL;
b3f66fd3
NTND
474 }
475 else if (git_work_tree_cfg) { /* #6, #14 */
476 if (is_absolute_path(git_work_tree_cfg))
477 set_git_work_tree(git_work_tree_cfg);
478 else {
56b9f6e7 479 char *core_worktree;
b3f66fd3
NTND
480 if (chdir(gitdirenv))
481 die_errno("Could not chdir to '%s'", gitdirenv);
482 if (chdir(git_work_tree_cfg))
483 die_errno("Could not chdir to '%s'", git_work_tree_cfg);
56b9f6e7 484 core_worktree = xgetcwd();
7333ed17 485 if (chdir(cwd->buf))
b3f66fd3
NTND
486 die_errno("Could not come back to cwd");
487 set_git_work_tree(core_worktree);
56b9f6e7 488 free(core_worktree);
b3f66fd3
NTND
489 }
490 }
2cd83d10
JK
491 else if (!git_env_bool(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, 1)) {
492 /* #16d */
493 set_git_dir(gitdirenv);
494 free(gitfile);
495 return NULL;
496 }
b3f66fd3
NTND
497 else /* #2, #10 */
498 set_git_work_tree(".");
499
500 /* set_git_work_tree() must have been called by now */
501 worktree = get_git_work_tree();
502
503 /* both get_git_work_tree() and cwd are already normalized */
7333ed17 504 if (!strcmp(cwd->buf, worktree)) { /* cwd == worktree */
b3f66fd3
NTND
505 set_git_dir(gitdirenv);
506 free(gitfile);
e4e30347 507 return NULL;
b3f66fd3 508 }
e4e30347 509
7333ed17 510 offset = dir_inside_of(cwd->buf, worktree);
9b125da4 511 if (offset >= 0) { /* cwd inside worktree? */
e2a57aac 512 set_git_dir(real_path(gitdirenv));
b3f66fd3
NTND
513 if (chdir(worktree))
514 die_errno("Could not chdir to '%s'", worktree);
7333ed17 515 strbuf_addch(cwd, '/');
b3f66fd3 516 free(gitfile);
7333ed17 517 return cwd->buf + offset;
93a00542 518 }
b3f66fd3
NTND
519
520 /* cwd outside worktree */
521 set_git_dir(gitdirenv);
522 free(gitfile);
523 return NULL;
93a00542
JN
524}
525
9951d3b3 526static const char *setup_discovered_git_dir(const char *gitdir,
7333ed17 527 struct strbuf *cwd, int offset,
9951d3b3 528 int *nongit_ok)
98937bef 529{
9951d3b3
NTND
530 if (check_repository_format_gently(gitdir, nongit_ok))
531 return NULL;
98937bef 532
4868b2ea
JN
533 /* --work-tree is set without --git-dir; use discovered one */
534 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
7333ed17 535 if (offset != cwd->len && !is_absolute_path(gitdir))
e2a57aac 536 gitdir = xstrdup(real_path(gitdir));
7333ed17 537 if (chdir(cwd->buf))
4868b2ea 538 die_errno("Could not come back to cwd");
7333ed17 539 return setup_explicit_git_dir(gitdir, cwd, nongit_ok);
4868b2ea
JN
540 }
541
9951d3b3
NTND
542 /* #16.2, #17.2, #20.2, #21.2, #24, #25, #28, #29 (see t1510) */
543 if (is_bare_repository_cfg > 0) {
7333ed17
RS
544 set_git_dir(offset == cwd->len ? gitdir : real_path(gitdir));
545 if (chdir(cwd->buf))
9951d3b3 546 die_errno("Could not come back to cwd");
98937bef 547 return NULL;
9951d3b3 548 }
98937bef 549
9951d3b3
NTND
550 /* #0, #1, #5, #8, #9, #12, #13 */
551 set_git_work_tree(".");
552 if (strcmp(gitdir, DEFAULT_GIT_DIR_ENVIRONMENT))
553 set_git_dir(gitdir);
98937bef 554 inside_git_dir = 0;
9951d3b3 555 inside_work_tree = 1;
7333ed17 556 if (offset == cwd->len)
98937bef
NTND
557 return NULL;
558
559 /* Make "offset" point to past the '/', and add a '/' at the end */
560 offset++;
7333ed17
RS
561 strbuf_addch(cwd, '/');
562 return cwd->buf + offset;
98937bef
NTND
563}
564
1cd8031b 565/* #16.1, #17.1, #20.1, #21.1, #22.1 (see t1510) */
7333ed17
RS
566static const char *setup_bare_git_dir(struct strbuf *cwd, int offset,
567 int *nongit_ok)
68698da5
JN
568{
569 int root_len;
570
1cd8031b
NTND
571 if (check_repository_format_gently(".", nongit_ok))
572 return NULL;
573
2cd83d10
JK
574 setenv(GIT_IMPLICIT_WORK_TREE_ENVIRONMENT, "0", 1);
575
4868b2ea
JN
576 /* --work-tree is set without --git-dir; use discovered one */
577 if (getenv(GIT_WORK_TREE_ENVIRONMENT) || git_work_tree_cfg) {
578 const char *gitdir;
579
7333ed17
RS
580 gitdir = offset == cwd->len ? "." : xmemdupz(cwd->buf, offset);
581 if (chdir(cwd->buf))
4868b2ea 582 die_errno("Could not come back to cwd");
7333ed17 583 return setup_explicit_git_dir(gitdir, cwd, nongit_ok);
4868b2ea
JN
584 }
585
68698da5 586 inside_git_dir = 1;
1cd8031b 587 inside_work_tree = 0;
7333ed17
RS
588 if (offset != cwd->len) {
589 if (chdir(cwd->buf))
8fc0ae80 590 die_errno("Cannot come back to cwd");
7333ed17
RS
591 root_len = offset_1st_component(cwd->buf);
592 strbuf_setlen(cwd, offset > root_len ? offset : root_len);
593 set_git_dir(cwd->buf);
337e51ce 594 }
1cd8031b 595 else
68698da5 596 set_git_dir(".");
68698da5
JN
597 return NULL;
598}
599
f161edeb
JN
600static const char *setup_nongit(const char *cwd, int *nongit_ok)
601{
602 if (!nongit_ok)
603 die("Not a git repository (or any of the parent directories): %s", DEFAULT_GIT_DIR_ENVIRONMENT);
604 if (chdir(cwd))
605 die_errno("Cannot come back to cwd");
606 *nongit_ok = 1;
607 return NULL;
608}
609
2565b43b 610static dev_t get_device_or_die(const char *path, const char *prefix, int prefix_len)
60c98d1e
JN
611{
612 struct stat buf;
2565b43b
CB
613 if (stat(path, &buf)) {
614 die_errno("failed to stat '%*s%s%s'",
615 prefix_len,
60c98d1e
JN
616 prefix ? prefix : "",
617 prefix ? "/" : "", path);
2565b43b 618 }
60c98d1e
JN
619 return buf.st_dev;
620}
621
9e2326c7 622/*
1b77d83c
MH
623 * A "string_list_each_func_t" function that canonicalizes an entry
624 * from GIT_CEILING_DIRECTORIES using real_path_if_valid(), or
7ec30aaa
MH
625 * discards it if unusable. The presence of an empty entry in
626 * GIT_CEILING_DIRECTORIES turns off canonicalization for all
627 * subsequent entries.
9e2326c7 628 */
1b77d83c 629static int canonicalize_ceiling_entry(struct string_list_item *item,
7ec30aaa 630 void *cb_data)
9e2326c7 631{
7ec30aaa 632 int *empty_entry_found = cb_data;
1b77d83c 633 char *ceil = item->string;
9e2326c7 634
7ec30aaa
MH
635 if (!*ceil) {
636 *empty_entry_found = 1;
9e2326c7 637 return 0;
7ec30aaa 638 } else if (!is_absolute_path(ceil)) {
9e2326c7 639 return 0;
7ec30aaa
MH
640 } else if (*empty_entry_found) {
641 /* Keep entry but do not canonicalize it */
642 return 1;
643 } else {
644 const char *real_path = real_path_if_valid(ceil);
645 if (!real_path)
646 return 0;
647 free(item->string);
648 item->string = xstrdup(real_path);
649 return 1;
650 }
9e2326c7
MH
651}
652
e90fdc39
JS
653/*
654 * We cannot decide in this function whether we are in the work tree or
655 * not, since the config can only be read _after_ this function was called.
656 */
a60645f9 657static const char *setup_git_directory_gently_1(int *nongit_ok)
d288a700 658{
0454dd93 659 const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT);
31171d9e 660 struct string_list ceiling_dirs = STRING_LIST_INIT_DUP;
7333ed17 661 static struct strbuf cwd = STRBUF_INIT;
9951d3b3
NTND
662 const char *gitdirenv, *ret;
663 char *gitfile;
7333ed17 664 int offset, offset_parent, ceil_offset = -1;
c7d1d1b1
RH
665 dev_t current_device = 0;
666 int one_filesystem = 1;
d288a700 667
3c8687a7
TA
668 /*
669 * We may have read an incomplete configuration before
670 * setting-up the git directory. If so, clear the cache so
671 * that the next queries to the configuration reload complete
672 * configuration (including the per-repo config file that we
673 * ignored previously).
674 */
675 git_config_clear();
676
af05d679
SG
677 /*
678 * Let's assume that we are in a git repository.
679 * If it turns out later that we are somewhere else, the value will be
680 * updated accordingly.
681 */
682 if (nongit_ok)
683 *nongit_ok = 0;
684
7333ed17 685 if (strbuf_getcwd(&cwd))
b3f66fd3 686 die_errno("Unable to read current working directory");
7333ed17 687 offset = cwd.len;
b3f66fd3 688
e90fdc39
JS
689 /*
690 * If GIT_DIR is set explicitly, we're not going
691 * to do any discovery, but we still do repository
692 * validation.
693 */
ad1a382f 694 gitdirenv = getenv(GIT_DIR_ENVIRONMENT);
e4e30347 695 if (gitdirenv)
7333ed17 696 return setup_explicit_git_dir(gitdirenv, &cwd, nongit_ok);
d288a700 697
31171d9e 698 if (env_ceiling_dirs) {
7ec30aaa
MH
699 int empty_entry_found = 0;
700
31171d9e 701 string_list_split(&ceiling_dirs, env_ceiling_dirs, PATH_SEP, -1);
1b77d83c 702 filter_string_list(&ceiling_dirs, 0,
7ec30aaa 703 canonicalize_ceiling_entry, &empty_entry_found);
7333ed17 704 ceil_offset = longest_ancestor_length(cwd.buf, &ceiling_dirs);
31171d9e
MH
705 string_list_clear(&ceiling_dirs, 0);
706 }
707
7333ed17 708 if (ceil_offset < 0 && has_dos_drive_prefix(cwd.buf))
17d778e7 709 ceil_offset = 1;
d288a700 710
892c41b9 711 /*
e90fdc39 712 * Test in the following order (relative to the cwd):
b44ebb19 713 * - .git (file containing "gitdir: <path>")
e90fdc39
JS
714 * - .git/
715 * - ./ (bare)
b44ebb19 716 * - ../.git
e90fdc39
JS
717 * - ../.git/
718 * - ../ (bare)
719 * - ../../.git/
720 * etc.
892c41b9 721 */
cf87463e 722 one_filesystem = !git_env_bool("GIT_DISCOVERY_ACROSS_FILESYSTEM", 0);
60c98d1e 723 if (one_filesystem)
2565b43b 724 current_device = get_device_or_die(".", NULL, 0);
e90fdc39 725 for (;;) {
13d6ec91 726 gitfile = (char*)read_gitfile(DEFAULT_GIT_DIR_ENVIRONMENT);
9951d3b3
NTND
727 if (gitfile)
728 gitdirenv = gitfile = xstrdup(gitfile);
729 else {
730 if (is_git_directory(DEFAULT_GIT_DIR_ENVIRONMENT))
731 gitdirenv = DEFAULT_GIT_DIR_ENVIRONMENT;
732 }
733
734 if (gitdirenv) {
735 ret = setup_discovered_git_dir(gitdirenv,
7333ed17 736 &cwd, offset,
9951d3b3
NTND
737 nongit_ok);
738 free(gitfile);
739 return ret;
740 }
741 free(gitfile);
742
68698da5 743 if (is_git_directory("."))
7333ed17 744 return setup_bare_git_dir(&cwd, offset, nongit_ok);
1cd8031b 745
2565b43b 746 offset_parent = offset;
7333ed17 747 while (--offset_parent > ceil_offset && cwd.buf[offset_parent] != '/');
2565b43b 748 if (offset_parent <= ceil_offset)
7333ed17 749 return setup_nongit(cwd.buf, nongit_ok);
8030e442 750 if (one_filesystem) {
7333ed17
RS
751 dev_t parent_device = get_device_or_die("..", cwd.buf,
752 offset);
60c98d1e 753 if (parent_device != current_device) {
8030e442 754 if (nongit_ok) {
7333ed17 755 if (chdir(cwd.buf))
8030e442
LD
756 die_errno("Cannot come back to cwd");
757 *nongit_ok = 1;
758 return NULL;
759 }
7333ed17 760 strbuf_setlen(&cwd, offset);
2565b43b 761 die("Not a git repository (or any parent up to mount point %s)\n"
7333ed17
RS
762 "Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).",
763 cwd.buf);
8030e442
LD
764 }
765 }
502ffe34 766 if (chdir("..")) {
7333ed17
RS
767 strbuf_setlen(&cwd, offset);
768 die_errno("Cannot change to '%s/..'", cwd.buf);
502ffe34 769 }
2565b43b 770 offset = offset_parent;
892c41b9 771 }
d288a700 772}
5e7bfe25 773
a60645f9
NTND
774const char *setup_git_directory_gently(int *nongit_ok)
775{
776 const char *prefix;
777
778 prefix = setup_git_directory_gently_1(nongit_ok);
1f5d271f 779 if (prefix)
a6f7f9a3 780 setenv(GIT_PREFIX_ENVIRONMENT, prefix, 1);
1f5d271f 781 else
a6f7f9a3 782 setenv(GIT_PREFIX_ENVIRONMENT, "", 1);
1f5d271f 783
f07d6a1a 784 if (startup_info) {
a60645f9 785 startup_info->have_repository = !nongit_ok || !*nongit_ok;
f07d6a1a
NTND
786 startup_info->prefix = prefix;
787 }
a60645f9
NTND
788 return prefix;
789}
790
94df2506
JH
791int git_config_perm(const char *var, const char *value)
792{
06cbe855
HO
793 int i;
794 char *endptr;
795
796 if (value == NULL)
797 return PERM_GROUP;
798
799 if (!strcmp(value, "umask"))
800 return PERM_UMASK;
801 if (!strcmp(value, "group"))
802 return PERM_GROUP;
803 if (!strcmp(value, "all") ||
804 !strcmp(value, "world") ||
805 !strcmp(value, "everybody"))
806 return PERM_EVERYBODY;
807
808 /* Parse octal numbers */
809 i = strtol(value, &endptr, 8);
810
811 /* If not an octal number, maybe true/false? */
812 if (*endptr != 0)
813 return git_config_bool(var, value) ? PERM_GROUP : PERM_UMASK;
814
815 /*
816 * Treat values 0, 1 and 2 as compatibility cases, otherwise it is
5a688fe4 817 * a chmod value to restrict to.
06cbe855
HO
818 */
819 switch (i) {
820 case PERM_UMASK: /* 0 */
821 return PERM_UMASK;
822 case OLD_PERM_GROUP: /* 1 */
823 return PERM_GROUP;
824 case OLD_PERM_EVERYBODY: /* 2 */
825 return PERM_EVERYBODY;
94df2506 826 }
06cbe855
HO
827
828 /* A filemode value was given: 0xxx */
829
830 if ((i & 0600) != 0600)
831 die("Problem with core.sharedRepository filemode value "
832 "(0%.3o).\nThe owner of files must always have "
833 "read and write permissions.", i);
834
835 /*
836 * Mask filemode value. Others can not get write permission.
837 * x flags for directories are handled separately.
838 */
5a688fe4 839 return -(i & 0666);
94df2506
JH
840}
841
ef90d6d4 842int check_repository_format_version(const char *var, const char *value, void *cb)
ab9cb76f 843{
299726d5
JS
844 if (strcmp(var, "core.repositoryformatversion") == 0)
845 repository_format_version = git_config_int(var, value);
457f06d6 846 else if (strcmp(var, "core.sharedrepository") == 0)
94df2506 847 shared_repository = git_config_perm(var, value);
e90fdc39
JS
848 else if (strcmp(var, "core.bare") == 0) {
849 is_bare_repository_cfg = git_config_bool(var, value);
850 if (is_bare_repository_cfg == 1)
851 inside_work_tree = -1;
852 } else if (strcmp(var, "core.worktree") == 0) {
180483c5
JH
853 if (!value)
854 return config_error_nonbool(var);
8e0f7003 855 free(git_work_tree_cfg);
e90fdc39
JS
856 git_work_tree_cfg = xstrdup(value);
857 inside_work_tree = -1;
858 }
299726d5 859 return 0;
ab9cb76f
JH
860}
861
862int check_repository_format(void)
863{
337e51ce 864 return check_repository_format_gently(get_git_dir(), NULL);
ab9cb76f
JH
865}
866
e1e5ec86
CB
867/*
868 * Returns the "prefix", a path to the current working directory
869 * relative to the work tree root, or NULL, if the current working
870 * directory is not a strict subdirectory of the work tree root. The
871 * prefix always ends with a '/' character.
872 */
5e7bfe25
JH
873const char *setup_git_directory(void)
874{
b3f66fd3 875 return setup_git_directory_gently(NULL);
5e7bfe25 876}
abc06822
FG
877
878const char *resolve_gitdir(const char *suspect)
879{
880 if (is_git_directory(suspect))
881 return suspect;
efc5fb6a 882 return read_gitfile(suspect);
abc06822 883}
1d999ddd
TR
884
885/* if any standard file descriptor is missing open it to /dev/null */
886void sanitize_stdfds(void)
887{
888 int fd = open("/dev/null", O_RDWR, 0);
889 while (fd != -1 && fd < 2)
890 fd = dup(fd);
891 if (fd == -1)
892 die_errno("open /dev/null or dup failed");
893 if (fd > 2)
894 close(fd);
895}
de0957ce
NTND
896
897int daemonize(void)
898{
899#ifdef NO_POSIX_GOODIES
900 errno = ENOSYS;
901 return -1;
902#else
903 switch (fork()) {
904 case 0:
905 break;
906 case -1:
907 die_errno("fork failed");
908 default:
909 exit(0);
910 }
911 if (setsid() == -1)
912 die_errno("setsid failed");
913 close(0);
914 close(1);
915 close(2);
916 sanitize_stdfds();
917 return 0;
918#endif
919}