git

1
/*
2
 * We put all the git config variables in this same object
3
 * file, so that programs can link against the config parser
4
 * without having to link against all the rest of git.
5
 *
6
 * In particular, no need to bring in libz etc unless needed,
7
 * even if you might want to know where the git directory etc
8
 * are.
9
 */
10

11
#define USE_THE_REPOSITORY_VARIABLE
12

13
#include "git-compat-util.h"
14
#include "abspath.h"
15
#include "branch.h"
16
#include "convert.h"
17
#include "environment.h"
18
#include "gettext.h"
19
#include "repository.h"
20
#include "config.h"
21
#include "refs.h"
22
#include "fmt-merge-msg.h"
23
#include "commit.h"
24
#include "strvec.h"
25
#include "object-file.h"
26
#include "object-store-ll.h"
27
#include "path.h"
28
#include "replace-object.h"
29
#include "tmp-objdir.h"
30
#include "chdir-notify.h"
31
#include "setup.h"
32
#include "shallow.h"
33
#include "trace.h"
34
#include "write-or-die.h"
35

36
int trust_executable_bit = 1;
37
int trust_ctime = 1;
38
int check_stat = 1;
39
int has_symlinks = 1;
40
int minimum_abbrev = 4, default_abbrev = -1;
41
int ignore_case;
42
int assume_unchanged;
43
int prefer_symlink_refs;
44
int is_bare_repository_cfg = -1; /* unspecified */
45
int warn_ambiguous_refs = 1;
46
int warn_on_object_refname_ambiguity = 1;
47
int repository_format_precious_objects;
48
char *git_commit_encoding;
49
char *git_log_output_encoding;
50
char *apply_default_whitespace;
51
char *apply_default_ignorewhitespace;
52
char *git_attributes_file;
53
char *git_hooks_path;
54
int zlib_compression_level = Z_BEST_SPEED;
55
int pack_compression_level = Z_DEFAULT_COMPRESSION;
56
int fsync_object_files = -1;
57
int use_fsync = -1;
58
enum fsync_method fsync_method = FSYNC_METHOD_DEFAULT;
59
enum fsync_component fsync_components = FSYNC_COMPONENTS_DEFAULT;
60
size_t packed_git_window_size = DEFAULT_PACKED_GIT_WINDOW_SIZE;
61
size_t packed_git_limit = DEFAULT_PACKED_GIT_LIMIT;
62
size_t delta_base_cache_limit = 96 * 1024 * 1024;
63
unsigned long big_file_threshold = 512 * 1024 * 1024;
64
char *editor_program;
65
char *askpass_program;
66
char *excludes_file;
67
enum auto_crlf auto_crlf = AUTO_CRLF_FALSE;
68
enum eol core_eol = EOL_UNSET;
69
int global_conv_flags_eol = CONV_EOL_RNDTRP_WARN;
70
char *check_roundtrip_encoding;
71
enum branch_track git_branch_track = BRANCH_TRACK_REMOTE;
72
enum rebase_setup_type autorebase = AUTOREBASE_NEVER;
73
enum push_default_type push_default = PUSH_DEFAULT_UNSPECIFIED;
74
#ifndef OBJECT_CREATION_MODE
75
#define OBJECT_CREATION_MODE OBJECT_CREATION_USES_HARDLINKS
76
#endif
77
enum object_creation_mode object_creation_mode = OBJECT_CREATION_MODE;
78
char *notes_ref_name;
79
int grafts_keep_true_parents;
80
int core_apply_sparse_checkout;
81
int core_sparse_checkout_cone;
82
int sparse_expect_files_outside_of_patterns;
83
int merge_log_config = -1;
84
int precomposed_unicode = -1; /* see probe_utf8_pathname_composition() */
85
unsigned long pack_size_limit_cfg;
86
enum log_refs_config log_all_ref_updates = LOG_REFS_UNSET;
87
int max_allowed_tree_depth =
88
#ifdef _MSC_VER
89
	/*
90
	 * When traversing into too-deep trees, Visual C-compiled Git seems to
91
	 * run into some internal stack overflow detection in the
92
	 * `RtlpAllocateHeap()` function that is called from within
93
	 * `git_inflate_init()`'s call tree. The following value seems to be
94
	 * low enough to avoid that by letting Git exit with an error before
95
	 * the stack overflow can occur.
96
	 */
97
	512;
98
#else
99
	2048;
100
#endif
101

102
#ifndef PROTECT_HFS_DEFAULT
103
#define PROTECT_HFS_DEFAULT 0
104
#endif
105
int protect_hfs = PROTECT_HFS_DEFAULT;
106

107
#ifndef PROTECT_NTFS_DEFAULT
108
#define PROTECT_NTFS_DEFAULT 1
109
#endif
110
int protect_ntfs = PROTECT_NTFS_DEFAULT;
111

112
/*
113
 * The character that begins a commented line in user-editable file
114
 * that is subject to stripspace.
115
 */
116
const char *comment_line_str = "#";
117
char *comment_line_str_to_free;
118
int auto_comment_line_char;
119

120
/* Parallel index stat data preload? */
121
int core_preload_index = 1;
122

123
/* This is set by setup_git_dir_gently() and/or git_default_config() */
124
char *git_work_tree_cfg;
125

126
static char *git_namespace;
127

128
/*
129
 * Repository-local GIT_* environment variables; see environment.h for details.
130
 */
131
const char * const local_repo_env[] = {
132
	ALTERNATE_DB_ENVIRONMENT,
133
	CONFIG_ENVIRONMENT,
134
	CONFIG_DATA_ENVIRONMENT,
135
	CONFIG_COUNT_ENVIRONMENT,
136
	DB_ENVIRONMENT,
137
	GIT_DIR_ENVIRONMENT,
138
	GIT_WORK_TREE_ENVIRONMENT,
139
	GIT_IMPLICIT_WORK_TREE_ENVIRONMENT,
140
	GRAFT_ENVIRONMENT,
141
	INDEX_ENVIRONMENT,
142
	NO_REPLACE_OBJECTS_ENVIRONMENT,
143
	GIT_REPLACE_REF_BASE_ENVIRONMENT,
144
	GIT_PREFIX_ENVIRONMENT,
145
	GIT_SHALLOW_FILE_ENVIRONMENT,
146
	GIT_COMMON_DIR_ENVIRONMENT,
147
	NULL
148
};
149

150
static char *expand_namespace(const char *raw_namespace)
151
{
152
	struct strbuf buf = STRBUF_INIT;
153
	struct strbuf **components, **c;
154

155
	if (!raw_namespace || !*raw_namespace)
156
		return xstrdup("");
157

158
	strbuf_addstr(&buf, raw_namespace);
159
	components = strbuf_split(&buf, '/');
160
	strbuf_reset(&buf);
161
	for (c = components; *c; c++)
162
		if (strcmp((*c)->buf, "/") != 0)
163
			strbuf_addf(&buf, "refs/namespaces/%s", (*c)->buf);
164
	strbuf_list_free(components);
165
	if (check_refname_format(buf.buf, 0))
166
		die(_("bad git namespace path \"%s\""), raw_namespace);
167
	strbuf_addch(&buf, '/');
168
	return strbuf_detach(&buf, NULL);
169
}
170

171
const char *getenv_safe(struct strvec *argv, const char *name)
172
{
173
	const char *value = getenv(name);
174

175
	if (!value)
176
		return NULL;
177

178
	strvec_push(argv, value);
179
	return argv->v[argv->nr - 1];
180
}
181

182
void setup_git_env(const char *git_dir)
183
{
184
	char *git_replace_ref_base;
185
	const char *shallow_file;
186
	const char *replace_ref_base;
187
	struct set_gitdir_args args = { NULL };
188
	struct strvec to_free = STRVEC_INIT;
189

190
	args.commondir = getenv_safe(&to_free, GIT_COMMON_DIR_ENVIRONMENT);
191
	args.object_dir = getenv_safe(&to_free, DB_ENVIRONMENT);
192
	args.graft_file = getenv_safe(&to_free, GRAFT_ENVIRONMENT);
193
	args.index_file = getenv_safe(&to_free, INDEX_ENVIRONMENT);
194
	args.alternate_db = getenv_safe(&to_free, ALTERNATE_DB_ENVIRONMENT);
195
	if (getenv(GIT_QUARANTINE_ENVIRONMENT)) {
196
		args.disable_ref_updates = 1;
197
	}
198

199
	repo_set_gitdir(the_repository, git_dir, &args);
200
	strvec_clear(&to_free);
201

202
	if (getenv(NO_REPLACE_OBJECTS_ENVIRONMENT))
203
		disable_replace_refs();
204
	replace_ref_base = getenv(GIT_REPLACE_REF_BASE_ENVIRONMENT);
205
	git_replace_ref_base = xstrdup(replace_ref_base ? replace_ref_base
206
							  : "refs/replace/");
207
	update_ref_namespace(NAMESPACE_REPLACE, git_replace_ref_base);
208

209
	free(git_namespace);
210
	git_namespace = expand_namespace(getenv(GIT_NAMESPACE_ENVIRONMENT));
211
	shallow_file = getenv(GIT_SHALLOW_FILE_ENVIRONMENT);
212
	if (shallow_file)
213
		set_alternate_shallow_file(the_repository, shallow_file, 0);
214

215
	if (git_env_bool(NO_LAZY_FETCH_ENVIRONMENT, 0))
216
		fetch_if_missing = 0;
217
}
218

219
int is_bare_repository(void)
220
{
221
	/* if core.bare is not 'false', let's see if there is a work tree */
222
	return is_bare_repository_cfg && !get_git_work_tree();
223
}
224

225
int have_git_dir(void)
226
{
227
	return startup_info->have_repository
228
		|| the_repository->gitdir;
229
}
230

231
const char *get_git_dir(void)
232
{
233
	if (!the_repository->gitdir)
234
		BUG("git environment hasn't been setup");
235
	return the_repository->gitdir;
236
}
237

238
const char *get_git_common_dir(void)
239
{
240
	if (!the_repository->commondir)
241
		BUG("git environment hasn't been setup");
242
	return the_repository->commondir;
243
}
244

245
const char *get_git_namespace(void)
246
{
247
	if (!git_namespace)
248
		BUG("git environment hasn't been setup");
249
	return git_namespace;
250
}
251

252
const char *strip_namespace(const char *namespaced_ref)
253
{
254
	const char *out;
255
	if (skip_prefix(namespaced_ref, get_git_namespace(), &out))
256
		return out;
257
	return NULL;
258
}
259

260
static int git_work_tree_initialized;
261

262
/*
263
 * Note.  This works only before you used a work tree.  This was added
264
 * primarily to support git-clone to work in a new repository it just
265
 * created, and is not meant to flip between different work trees.
266
 */
267
void set_git_work_tree(const char *new_work_tree)
268
{
269
	if (git_work_tree_initialized) {
270
		struct strbuf realpath = STRBUF_INIT;
271

272
		strbuf_realpath(&realpath, new_work_tree, 1);
273
		new_work_tree = realpath.buf;
274
		if (strcmp(new_work_tree, the_repository->worktree))
275
			die("internal error: work tree has already been set\n"
276
			    "Current worktree: %s\nNew worktree: %s",
277
			    the_repository->worktree, new_work_tree);
278
		strbuf_release(&realpath);
279
		return;
280
	}
281
	git_work_tree_initialized = 1;
282
	repo_set_worktree(the_repository, new_work_tree);
283
}
284

285
const char *get_git_work_tree(void)
286
{
287
	return the_repository->worktree;
288
}
289

290
const char *get_object_directory(void)
291
{
292
	if (!the_repository->objects->odb)
293
		BUG("git environment hasn't been setup");
294
	return the_repository->objects->odb->path;
295
}
296

297
int odb_mkstemp(struct strbuf *temp_filename, const char *pattern)
298
{
299
	int fd;
300
	/*
301
	 * we let the umask do its job, don't try to be more
302
	 * restrictive except to remove write permission.
303
	 */
304
	int mode = 0444;
305
	git_path_buf(temp_filename, "objects/%s", pattern);
306
	fd = git_mkstemp_mode(temp_filename->buf, mode);
307
	if (0 <= fd)
308
		return fd;
309

310
	/* slow path */
311
	/* some mkstemp implementations erase temp_filename on failure */
312
	git_path_buf(temp_filename, "objects/%s", pattern);
313
	safe_create_leading_directories(temp_filename->buf);
314
	return xmkstemp_mode(temp_filename->buf, mode);
315
}
316

317
int odb_pack_keep(const char *name)
318
{
319
	int fd;
320

321
	fd = open(name, O_RDWR|O_CREAT|O_EXCL, 0600);
322
	if (0 <= fd)
323
		return fd;
324

325
	/* slow path */
326
	safe_create_leading_directories_const(name);
327
	return open(name, O_RDWR|O_CREAT|O_EXCL, 0600);
328
}
329

330
char *get_index_file(void)
331
{
332
	if (!the_repository->index_file)
333
		BUG("git environment hasn't been setup");
334
	return the_repository->index_file;
335
}
336

337
char *get_graft_file(struct repository *r)
338
{
339
	if (!r->graft_file)
340
		BUG("git environment hasn't been setup");
341
	return r->graft_file;
342
}
343

344
static void set_git_dir_1(const char *path)
345
{
346
	xsetenv(GIT_DIR_ENVIRONMENT, path, 1);
347
	setup_git_env(path);
348
}
349

350
static void update_relative_gitdir(const char *name UNUSED,
351
				   const char *old_cwd,
352
				   const char *new_cwd,
353
				   void *data UNUSED)
354
{
355
	char *path = reparent_relative_path(old_cwd, new_cwd, get_git_dir());
356
	struct tmp_objdir *tmp_objdir = tmp_objdir_unapply_primary_odb();
357

358
	trace_printf_key(&trace_setup_key,
359
			 "setup: move $GIT_DIR to '%s'",
360
			 path);
361
	set_git_dir_1(path);
362
	if (tmp_objdir)
363
		tmp_objdir_reapply_primary_odb(tmp_objdir, old_cwd, new_cwd);
364
	free(path);
365
}
366

367
void set_git_dir(const char *path, int make_realpath)
368
{
369
	struct strbuf realpath = STRBUF_INIT;
370

371
	if (make_realpath) {
372
		strbuf_realpath(&realpath, path, 1);
373
		path = realpath.buf;
374
	}
375

376
	set_git_dir_1(path);
377
	if (!is_absolute_path(path))
378
		chdir_notify_register(NULL, update_relative_gitdir, NULL);
379

380
	strbuf_release(&realpath);
381
}
382

383
const char *get_log_output_encoding(void)
384
{
385
	return git_log_output_encoding ? git_log_output_encoding
386
		: get_commit_output_encoding();
387
}
388

389
const char *get_commit_output_encoding(void)
390
{
391
	return git_commit_encoding ? git_commit_encoding : "UTF-8";
392
}
393

394
static int the_shared_repository = PERM_UMASK;
395
static int need_shared_repository_from_config = 1;
396

397
void set_shared_repository(int value)
398
{
399
	the_shared_repository = value;
400
	need_shared_repository_from_config = 0;
401
}
402

403
int get_shared_repository(void)
404
{
405
	if (need_shared_repository_from_config) {
406
		const char *var = "core.sharedrepository";
407
		const char *value;
408
		if (!git_config_get_value(var, &value))
409
			the_shared_repository = git_config_perm(var, value);
410
		need_shared_repository_from_config = 0;
411
	}
412
	return the_shared_repository;
413
}
414

415
void reset_shared_repository(void)
416
{
417
	need_shared_repository_from_config = 1;
418
}
419

420
int use_optional_locks(void)
421
{
422
	return git_env_bool(GIT_OPTIONAL_LOCKS_ENVIRONMENT, 1);
423
}
424

425
int print_sha1_ellipsis(void)
426
{
427
	/*
428
	 * Determine if the calling environment contains the variable
429
	 * GIT_PRINT_SHA1_ELLIPSIS set to "yes".
430
	 */
431
	static int cached_result = -1; /* unknown */
432

433
	if (cached_result < 0) {
434
		const char *v = getenv("GIT_PRINT_SHA1_ELLIPSIS");
435
		cached_result = (v && !strcasecmp(v, "yes"));
436
	}
437
	return cached_result;
438
}
439