die_errno(): double % in strerror() output just in case
[git/git.git] / setup.c
CommitLineData
d288a700 1#include "cache.h"
e90fdc39
JS
2#include "dir.h"
3
4static int inside_git_dir = -1;
5static int inside_work_tree = -1;
d288a700 6
d089ebaa
JH
7const 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);
9a13ba1b 11 if (is_absolute_path(orig))
d089ebaa
JH
12 strcpy(sanitized, path);
13 else {
14 if (len)
15 memcpy(sanitized, prefix, len);
16 strcpy(sanitized + len, path);
f332726e 17 }
f3cad0ad 18 if (normalize_path_copy(sanitized, sanitized))
d089ebaa 19 goto error_out;
9a13ba1b 20 if (is_absolute_path(orig)) {
d089ebaa
JH
21 const char *work_tree = get_git_work_tree();
22 size_t len = strlen(work_tree);
23 size_t total = strlen(sanitized) + 1;
24 if (strncmp(sanitized, work_tree, len) ||
25 (sanitized[len] != '\0' && sanitized[len] != '/')) {
26 error_out:
62525ef7 27 die("'%s' is outside repository", orig);
d089ebaa
JH
28 }
29 if (sanitized[len] == '/')
30 len++;
31 memmove(sanitized, sanitized + len, total - len);
32 }
33 return sanitized;
f332726e
LT
34}
35
a6080a0a 36/*
4ca06608
JH
37 * Unlike prefix_path, this should be used if the named file does
38 * not have to interact with index entry; i.e. name of a random file
39 * on the filesystem.
40 */
41const char *prefix_filename(const char *pfx, int pfx_len, const char *arg)
42{
43 static char path[PATH_MAX];
25fe217b 44#ifndef __MINGW32__
ecf4831d 45 if (!pfx || !*pfx || is_absolute_path(arg))
4ca06608
JH
46 return arg;
47 memcpy(path, pfx, pfx_len);
48 strcpy(path + pfx_len, arg);
25fe217b
JS
49#else
50 char *p;
51 /* don't add prefix to absolute paths, but still replace '\' by '/' */
52 if (is_absolute_path(arg))
53 pfx_len = 0;
54 else
55 memcpy(path, pfx, pfx_len);
56 strcpy(path + pfx_len, arg);
57 for (p = path + pfx_len; *p; p++)
58 if (*p == '\\')
59 *p = '/';
60#endif
4ca06608
JH
61 return path;
62}
63
e23d0b4a
LT
64/*
65 * Verify a filename that we got as an argument for a pathspec
66 * entry. Note that a filename that begins with "-" never verifies
67 * as true, because even if such a filename were to exist, we want
68 * it to be preceded by the "--" marker (or we want the user to
69 * use a format like "./-filename")
70 */
71void verify_filename(const char *prefix, const char *arg)
72{
73 const char *name;
74 struct stat st;
75
76 if (*arg == '-')
77 die("bad flag '%s' used after filename", arg);
78 name = prefix ? prefix_filename(prefix, strlen(prefix), arg) : arg;
79 if (!lstat(name, &st))
80 return;
81 if (errno == ENOENT)
ea92f41f
JH
82 die("ambiguous argument '%s': unknown revision or path not in the working tree.\n"
83 "Use '--' to separate paths from revisions", arg);
e23d0b4a
LT
84 die("'%s': %s", arg, strerror(errno));
85}
86
ea92f41f
JH
87/*
88 * Opposite of the above: the command line did not have -- marker
89 * and we parsed the arg as a refname. It should not be interpretable
90 * as a filename.
91 */
92void verify_non_filename(const char *prefix, const char *arg)
93{
94 const char *name;
95 struct stat st;
96
7ae3df8c 97 if (!is_inside_work_tree() || is_inside_git_dir())
68025633 98 return;
ea92f41f
JH
99 if (*arg == '-')
100 return; /* flag */
101 name = prefix ? prefix_filename(prefix, strlen(prefix), arg) : arg;
102 if (!lstat(name, &st))
103 die("ambiguous argument '%s': both revision and filename\n"
104 "Use '--' to separate filenames from revisions", arg);
33a798c8 105 if (errno != ENOENT && errno != ENOTDIR)
ea92f41f
JH
106 die("'%s': %s", arg, strerror(errno));
107}
108
6b5ee137 109const char **get_pathspec(const char *prefix, const char **pathspec)
d288a700 110{
6b5ee137 111 const char *entry = *pathspec;
d089ebaa 112 const char **src, **dst;
d288a700
LT
113 int prefixlen;
114
f332726e
LT
115 if (!prefix && !entry)
116 return NULL;
d288a700
LT
117
118 if (!entry) {
119 static const char *spec[2];
120 spec[0] = prefix;
121 spec[1] = NULL;
122 return spec;
123 }
124
125 /* Otherwise we have to re-write the entries.. */
d089ebaa
JH
126 src = pathspec;
127 dst = pathspec;
f332726e 128 prefixlen = prefix ? strlen(prefix) : 0;
d089ebaa
JH
129 while (*src) {
130 const char *p = prefix_path(prefix, prefixlen, *src);
62525ef7 131 *(dst++) = p;
d089ebaa
JH
132 src++;
133 }
134 *dst = NULL;
135 if (!*pathspec)
136 return NULL;
137 return pathspec;
d288a700
LT
138}
139
5f5608bc 140/*
ad1a382f 141 * Test if it looks like we're at a git directory.
5e7bfe25 142 * We want to see:
5f5608bc 143 *
790296fd 144 * - either an objects/ directory _or_ the proper
5f5608bc 145 * GIT_OBJECT_DIRECTORY environment variable
ad1a382f 146 * - a refs/ directory
8098a178 147 * - either a HEAD symlink or a HEAD file that is formatted as
c847f537
JH
148 * a proper "ref:", or a regular file HEAD that has a properly
149 * formatted sha1 object name.
5f5608bc 150 */
ad1a382f 151static int is_git_directory(const char *suspect)
5f5608bc 152{
ad1a382f
SP
153 char path[PATH_MAX];
154 size_t len = strlen(suspect);
155
156 strcpy(path, suspect);
157 if (getenv(DB_ENVIRONMENT)) {
158 if (access(getenv(DB_ENVIRONMENT), X_OK))
159 return 0;
160 }
161 else {
162 strcpy(path + len, "/objects");
163 if (access(path, X_OK))
164 return 0;
165 }
166
167 strcpy(path + len, "/refs");
168 if (access(path, X_OK))
8098a178 169 return 0;
ad1a382f
SP
170
171 strcpy(path + len, "/HEAD");
c847f537 172 if (validate_headref(path))
ad1a382f
SP
173 return 0;
174
8098a178 175 return 1;
5f5608bc
LT
176}
177
68025633
JS
178int is_inside_git_dir(void)
179{
e90fdc39
JS
180 if (inside_git_dir < 0)
181 inside_git_dir = is_inside_dir(get_git_dir());
182 return inside_git_dir;
892c41b9
ML
183}
184
892c41b9
ML
185int is_inside_work_tree(void)
186{
e90fdc39
JS
187 if (inside_work_tree < 0)
188 inside_work_tree = is_inside_dir(get_git_work_tree());
189 return inside_work_tree;
892c41b9
ML
190}
191
e90fdc39 192/*
7efeb8f0
JS
193 * set_work_tree() is only ever called if you set GIT_DIR explicitely.
194 * The old behaviour (which we retain here) is to set the work tree root
195 * to the cwd, unless overridden by the config, the command line, or
196 * GIT_WORK_TREE.
e90fdc39 197 */
7efeb8f0 198static const char *set_work_tree(const char *dir)
892c41b9 199{
7efeb8f0 200 char buffer[PATH_MAX + 1];
e90fdc39 201
7efeb8f0
JS
202 if (!getcwd(buffer, sizeof(buffer)))
203 die ("Could not get the current working directory");
204 git_work_tree_cfg = xstrdup(buffer);
e90fdc39
JS
205 inside_work_tree = 1;
206
7efeb8f0 207 return NULL;
68025633
JS
208}
209
f3fa1838
JH
210void setup_work_tree(void)
211{
354e6534
JS
212 const char *work_tree, *git_dir;
213 static int initialized = 0;
214
215 if (initialized)
216 return;
217 work_tree = get_git_work_tree();
218 git_dir = get_git_dir();
59f0f2f3 219 if (!is_absolute_path(git_dir))
044bbbcb 220 git_dir = make_absolute_path(git_dir);
59f0f2f3
MH
221 if (!work_tree || chdir(work_tree))
222 die("This operation must be run in a work tree");
044bbbcb 223 set_git_dir(make_relative_path(git_dir, work_tree));
354e6534 224 initialized = 1;
59f0f2f3
MH
225}
226
9459aa77
NTND
227static int check_repository_format_gently(int *nongit_ok)
228{
ef90d6d4 229 git_config(check_repository_format_version, NULL);
9459aa77
NTND
230 if (GIT_REPO_VERSION < repository_format_version) {
231 if (!nongit_ok)
232 die ("Expected git repo version <= %d, found %d",
233 GIT_REPO_VERSION, repository_format_version);
234 warning("Expected git repo version <= %d, found %d",
235 GIT_REPO_VERSION, repository_format_version);
236 warning("Please upgrade Git");
237 *nongit_ok = -1;
238 return -1;
239 }
240 return 0;
241}
242
b44ebb19
LH
243/*
244 * Try to read the location of the git directory from the .git file,
245 * return path to git directory if found.
246 */
247const char *read_gitfile_gently(const char *path)
248{
249 char *buf;
250 struct stat st;
251 int fd;
252 size_t len;
253
254 if (stat(path, &st))
255 return NULL;
256 if (!S_ISREG(st.st_mode))
257 return NULL;
258 fd = open(path, O_RDONLY);
259 if (fd < 0)
260 die("Error opening %s: %s", path, strerror(errno));
261 buf = xmalloc(st.st_size + 1);
262 len = read_in_full(fd, buf, st.st_size);
263 close(fd);
264 if (len != st.st_size)
265 die("Error reading %s", path);
266 buf[len] = '\0';
267 if (prefixcmp(buf, "gitdir: "))
268 die("Invalid gitfile format: %s", path);
269 while (buf[len - 1] == '\n' || buf[len - 1] == '\r')
270 len--;
271 if (len < 9)
272 die("No path in gitfile: %s", path);
273 buf[len] = '\0';
274 if (!is_git_directory(buf + 8))
275 die("Not a git repository: %s", buf + 8);
276 path = make_absolute_path(buf + 8);
277 free(buf);
278 return path;
279}
280
e90fdc39
JS
281/*
282 * We cannot decide in this function whether we are in the work tree or
283 * not, since the config can only be read _after_ this function was called.
284 */
4ca06608 285const char *setup_git_directory_gently(int *nongit_ok)
d288a700 286{
e90fdc39 287 const char *work_tree_env = getenv(GIT_WORK_TREE_ENVIRONMENT);
0454dd93 288 const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT);
d288a700 289 static char cwd[PATH_MAX+1];
e90fdc39 290 const char *gitdirenv;
b44ebb19 291 const char *gitfile_dir;
0454dd93 292 int len, offset, ceil_offset;
d288a700 293
af05d679
SG
294 /*
295 * Let's assume that we are in a git repository.
296 * If it turns out later that we are somewhere else, the value will be
297 * updated accordingly.
298 */
299 if (nongit_ok)
300 *nongit_ok = 0;
301
e90fdc39
JS
302 /*
303 * If GIT_DIR is set explicitly, we're not going
304 * to do any discovery, but we still do repository
305 * validation.
306 */
ad1a382f 307 gitdirenv = getenv(GIT_DIR_ENVIRONMENT);
e90fdc39
JS
308 if (gitdirenv) {
309 if (PATH_MAX - 40 < strlen(gitdirenv))
310 die("'$%s' too big", GIT_DIR_ENVIRONMENT);
311 if (is_git_directory(gitdirenv)) {
dd5c8af1
JS
312 static char buffer[1024 + 1];
313 const char *retval;
314
138dd1e9
NTND
315 if (!work_tree_env) {
316 retval = set_work_tree(gitdirenv);
9459aa77
NTND
317 /* config may override worktree */
318 if (check_repository_format_gently(nongit_ok))
319 return NULL;
138dd1e9
NTND
320 return retval;
321 }
9459aa77
NTND
322 if (check_repository_format_gently(nongit_ok))
323 return NULL;
dd5c8af1
JS
324 retval = get_relative_cwd(buffer, sizeof(buffer) - 1,
325 get_git_work_tree());
326 if (!retval || !*retval)
327 return NULL;
328 set_git_dir(make_absolute_path(gitdirenv));
329 if (chdir(work_tree_env) < 0)
330 die ("Could not chdir to %s", work_tree_env);
331 strcat(buffer, "/");
332 return retval;
892c41b9 333 }
3a3c3fc4 334 if (nongit_ok) {
41e95f69
ML
335 *nongit_ok = 1;
336 return NULL;
337 }
ad1a382f 338 die("Not a git repository: '%s'", gitdirenv);
5e7bfe25 339 }
d288a700 340
f66a4d68 341 if (!getcwd(cwd, sizeof(cwd)-1))
d288a700
LT
342 die("Unable to read current working directory");
343
0454dd93 344 ceil_offset = longest_ancestor_length(cwd, env_ceiling_dirs);
17d778e7
JH
345 if (ceil_offset < 0 && has_dos_drive_prefix(cwd))
346 ceil_offset = 1;
d288a700 347
892c41b9 348 /*
e90fdc39 349 * Test in the following order (relative to the cwd):
b44ebb19 350 * - .git (file containing "gitdir: <path>")
e90fdc39
JS
351 * - .git/
352 * - ./ (bare)
b44ebb19 353 * - ../.git
e90fdc39
JS
354 * - ../.git/
355 * - ../ (bare)
356 * - ../../.git/
357 * etc.
892c41b9 358 */
e90fdc39
JS
359 offset = len = strlen(cwd);
360 for (;;) {
b44ebb19
LH
361 gitfile_dir = read_gitfile_gently(DEFAULT_GIT_DIR_ENVIRONMENT);
362 if (gitfile_dir) {
363 if (set_git_dir(gitfile_dir))
364 die("Repository setup failed");
365 break;
366 }
e90fdc39
JS
367 if (is_git_directory(DEFAULT_GIT_DIR_ENVIRONMENT))
368 break;
369 if (is_git_directory(".")) {
370 inside_git_dir = 1;
371 if (!work_tree_env)
372 inside_work_tree = 0;
72183cb2
SG
373 if (offset != len) {
374 cwd[offset] = '\0';
375 setenv(GIT_DIR_ENVIRONMENT, cwd, 1);
376 } else
377 setenv(GIT_DIR_ENVIRONMENT, ".", 1);
9459aa77 378 check_repository_format_gently(nongit_ok);
892c41b9
ML
379 return NULL;
380 }
0454dd93
DR
381 while (--offset > ceil_offset && cwd[offset] != '/');
382 if (offset <= ceil_offset) {
383 if (nongit_ok) {
384 if (chdir(cwd))
385 die("Cannot come back to cwd");
386 *nongit_ok = 1;
387 return NULL;
e90fdc39 388 }
f66bc5f9 389 die("Not a git repository (or any of the parent directories): %s", DEFAULT_GIT_DIR_ENVIRONMENT);
0454dd93 390 }
7be77de2
AR
391 if (chdir(".."))
392 die("Cannot change to %s/..: %s", cwd, strerror(errno));
892c41b9
ML
393 }
394
e90fdc39
JS
395 inside_git_dir = 0;
396 if (!work_tree_env)
397 inside_work_tree = 1;
398 git_work_tree_cfg = xstrndup(cwd, offset);
9459aa77
NTND
399 if (check_repository_format_gently(nongit_ok))
400 return NULL;
e90fdc39 401 if (offset == len)
d288a700
LT
402 return NULL;
403
e90fdc39
JS
404 /* Make "offset" point to past the '/', and add a '/' at the end */
405 offset++;
406 cwd[len++] = '/';
407 cwd[len] = 0;
408 return cwd + offset;
d288a700 409}
5e7bfe25 410
94df2506
JH
411int git_config_perm(const char *var, const char *value)
412{
06cbe855
HO
413 int i;
414 char *endptr;
415
416 if (value == NULL)
417 return PERM_GROUP;
418
419 if (!strcmp(value, "umask"))
420 return PERM_UMASK;
421 if (!strcmp(value, "group"))
422 return PERM_GROUP;
423 if (!strcmp(value, "all") ||
424 !strcmp(value, "world") ||
425 !strcmp(value, "everybody"))
426 return PERM_EVERYBODY;
427
428 /* Parse octal numbers */
429 i = strtol(value, &endptr, 8);
430
431 /* If not an octal number, maybe true/false? */
432 if (*endptr != 0)
433 return git_config_bool(var, value) ? PERM_GROUP : PERM_UMASK;
434
435 /*
436 * Treat values 0, 1 and 2 as compatibility cases, otherwise it is
5a688fe4 437 * a chmod value to restrict to.
06cbe855
HO
438 */
439 switch (i) {
440 case PERM_UMASK: /* 0 */
441 return PERM_UMASK;
442 case OLD_PERM_GROUP: /* 1 */
443 return PERM_GROUP;
444 case OLD_PERM_EVERYBODY: /* 2 */
445 return PERM_EVERYBODY;
94df2506 446 }
06cbe855
HO
447
448 /* A filemode value was given: 0xxx */
449
450 if ((i & 0600) != 0600)
451 die("Problem with core.sharedRepository filemode value "
452 "(0%.3o).\nThe owner of files must always have "
453 "read and write permissions.", i);
454
455 /*
456 * Mask filemode value. Others can not get write permission.
457 * x flags for directories are handled separately.
458 */
5a688fe4 459 return -(i & 0666);
94df2506
JH
460}
461
ef90d6d4 462int check_repository_format_version(const char *var, const char *value, void *cb)
ab9cb76f 463{
299726d5
JS
464 if (strcmp(var, "core.repositoryformatversion") == 0)
465 repository_format_version = git_config_int(var, value);
457f06d6 466 else if (strcmp(var, "core.sharedrepository") == 0)
94df2506 467 shared_repository = git_config_perm(var, value);
e90fdc39
JS
468 else if (strcmp(var, "core.bare") == 0) {
469 is_bare_repository_cfg = git_config_bool(var, value);
470 if (is_bare_repository_cfg == 1)
471 inside_work_tree = -1;
472 } else if (strcmp(var, "core.worktree") == 0) {
180483c5
JH
473 if (!value)
474 return config_error_nonbool(var);
8e0f7003 475 free(git_work_tree_cfg);
e90fdc39
JS
476 git_work_tree_cfg = xstrdup(value);
477 inside_work_tree = -1;
478 }
299726d5 479 return 0;
ab9cb76f
JH
480}
481
482int check_repository_format(void)
483{
9459aa77 484 return check_repository_format_gently(NULL);
ab9cb76f
JH
485}
486
5e7bfe25
JH
487const char *setup_git_directory(void)
488{
4ca06608 489 const char *retval = setup_git_directory_gently(NULL);
e90fdc39
JS
490
491 /* If the work tree is not the default one, recompute prefix */
492 if (inside_work_tree < 0) {
493 static char buffer[PATH_MAX + 1];
494 char *rel;
495 if (retval && chdir(retval))
496 die ("Could not jump back into original cwd");
497 rel = get_relative_cwd(buffer, PATH_MAX, get_git_work_tree());
bb528633
NTND
498 if (rel && *rel && chdir(get_git_work_tree()))
499 die ("Could not jump to working directory");
e90fdc39
JS
500 return rel && *rel ? strcat(rel, "/") : NULL;
501 }
502
5e7bfe25
JH
503 return retval;
504}