pack-revindex: introduce a new API
[git] / environment.c
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 #include "cache.h"
11 #include "branch.h"
12 #include "repository.h"
13 #include "config.h"
14 #include "refs.h"
15 #include "fmt-merge-msg.h"
16 #include "commit.h"
17 #include "strvec.h"
18 #include "object-store.h"
19 #include "chdir-notify.h"
20 #include "shallow.h"
21
22 int trust_executable_bit = 1;
23 int trust_ctime = 1;
24 int check_stat = 1;
25 int has_symlinks = 1;
26 int minimum_abbrev = 4, default_abbrev = -1;
27 int ignore_case;
28 int assume_unchanged;
29 int prefer_symlink_refs;
30 int is_bare_repository_cfg = -1; /* unspecified */
31 int warn_ambiguous_refs = 1;
32 int warn_on_object_refname_ambiguity = 1;
33 int ref_paranoia = -1;
34 int repository_format_precious_objects;
35 int repository_format_worktree_config;
36 const char *git_commit_encoding;
37 const char *git_log_output_encoding;
38 char *apply_default_whitespace;
39 char *apply_default_ignorewhitespace;
40 const char *git_attributes_file;
41 const char *git_hooks_path;
42 int zlib_compression_level = Z_BEST_SPEED;
43 int core_compression_level;
44 int pack_compression_level = Z_DEFAULT_COMPRESSION;
45 int fsync_object_files;
46 size_t packed_git_window_size = DEFAULT_PACKED_GIT_WINDOW_SIZE;
47 size_t packed_git_limit = DEFAULT_PACKED_GIT_LIMIT;
48 size_t delta_base_cache_limit = 96 * 1024 * 1024;
49 unsigned long big_file_threshold = 512 * 1024 * 1024;
50 int pager_use_color = 1;
51 const char *editor_program;
52 const char *askpass_program;
53 const char *excludes_file;
54 enum auto_crlf auto_crlf = AUTO_CRLF_FALSE;
55 int read_replace_refs = 1;
56 char *git_replace_ref_base;
57 enum eol core_eol = EOL_UNSET;
58 int global_conv_flags_eol = CONV_EOL_RNDTRP_WARN;
59 char *check_roundtrip_encoding = "SHIFT-JIS";
60 unsigned whitespace_rule_cfg = WS_DEFAULT_RULE;
61 enum branch_track git_branch_track = BRANCH_TRACK_REMOTE;
62 enum rebase_setup_type autorebase = AUTOREBASE_NEVER;
63 enum push_default_type push_default = PUSH_DEFAULT_UNSPECIFIED;
64 #ifndef OBJECT_CREATION_MODE
65 #define OBJECT_CREATION_MODE OBJECT_CREATION_USES_HARDLINKS
66 #endif
67 enum object_creation_mode object_creation_mode = OBJECT_CREATION_MODE;
68 char *notes_ref_name;
69 int grafts_replace_parents = 1;
70 int core_apply_sparse_checkout;
71 int core_sparse_checkout_cone;
72 int merge_log_config = -1;
73 int precomposed_unicode = -1; /* see probe_utf8_pathname_composition() */
74 unsigned long pack_size_limit_cfg;
75 enum log_refs_config log_all_ref_updates = LOG_REFS_UNSET;
76
77 #ifndef PROTECT_HFS_DEFAULT
78 #define PROTECT_HFS_DEFAULT 0
79 #endif
80 int protect_hfs = PROTECT_HFS_DEFAULT;
81
82 #ifndef PROTECT_NTFS_DEFAULT
83 #define PROTECT_NTFS_DEFAULT 1
84 #endif
85 int protect_ntfs = PROTECT_NTFS_DEFAULT;
86 const char *core_fsmonitor;
87
88 /*
89  * The character that begins a commented line in user-editable file
90  * that is subject to stripspace.
91  */
92 char comment_line_char = '#';
93 int auto_comment_line_char;
94
95 /* Parallel index stat data preload? */
96 int core_preload_index = 1;
97
98 /*
99  * This is a hack for test programs like test-dump-untracked-cache to
100  * ensure that they do not modify the untracked cache when reading it.
101  * Do not use it otherwise!
102  */
103 int ignore_untracked_cache_config;
104
105 /* This is set by setup_git_dir_gently() and/or git_default_config() */
106 char *git_work_tree_cfg;
107
108 static char *git_namespace;
109
110 static char *super_prefix;
111
112 /*
113  * Repository-local GIT_* environment variables; see cache.h for details.
114  */
115 const char * const local_repo_env[] = {
116         ALTERNATE_DB_ENVIRONMENT,
117         CONFIG_ENVIRONMENT,
118         CONFIG_DATA_ENVIRONMENT,
119         DB_ENVIRONMENT,
120         GIT_DIR_ENVIRONMENT,
121         GIT_WORK_TREE_ENVIRONMENT,
122         GIT_IMPLICIT_WORK_TREE_ENVIRONMENT,
123         GRAFT_ENVIRONMENT,
124         INDEX_ENVIRONMENT,
125         NO_REPLACE_OBJECTS_ENVIRONMENT,
126         GIT_REPLACE_REF_BASE_ENVIRONMENT,
127         GIT_PREFIX_ENVIRONMENT,
128         GIT_SUPER_PREFIX_ENVIRONMENT,
129         GIT_SHALLOW_FILE_ENVIRONMENT,
130         GIT_COMMON_DIR_ENVIRONMENT,
131         NULL
132 };
133
134 static char *expand_namespace(const char *raw_namespace)
135 {
136         struct strbuf buf = STRBUF_INIT;
137         struct strbuf **components, **c;
138
139         if (!raw_namespace || !*raw_namespace)
140                 return xstrdup("");
141
142         strbuf_addstr(&buf, raw_namespace);
143         components = strbuf_split(&buf, '/');
144         strbuf_reset(&buf);
145         for (c = components; *c; c++)
146                 if (strcmp((*c)->buf, "/") != 0)
147                         strbuf_addf(&buf, "refs/namespaces/%s", (*c)->buf);
148         strbuf_list_free(components);
149         if (check_refname_format(buf.buf, 0))
150                 die(_("bad git namespace path \"%s\""), raw_namespace);
151         strbuf_addch(&buf, '/');
152         return strbuf_detach(&buf, NULL);
153 }
154
155 /*
156  * Wrapper of getenv() that returns a strdup value. This value is kept
157  * in argv to be freed later.
158  */
159 static const char *getenv_safe(struct strvec *argv, const char *name)
160 {
161         const char *value = getenv(name);
162
163         if (!value)
164                 return NULL;
165
166         strvec_push(argv, value);
167         return argv->v[argv->nr - 1];
168 }
169
170 void setup_git_env(const char *git_dir)
171 {
172         const char *shallow_file;
173         const char *replace_ref_base;
174         struct set_gitdir_args args = { NULL };
175         struct strvec to_free = STRVEC_INIT;
176
177         args.commondir = getenv_safe(&to_free, GIT_COMMON_DIR_ENVIRONMENT);
178         args.object_dir = getenv_safe(&to_free, DB_ENVIRONMENT);
179         args.graft_file = getenv_safe(&to_free, GRAFT_ENVIRONMENT);
180         args.index_file = getenv_safe(&to_free, INDEX_ENVIRONMENT);
181         args.alternate_db = getenv_safe(&to_free, ALTERNATE_DB_ENVIRONMENT);
182         repo_set_gitdir(the_repository, git_dir, &args);
183         strvec_clear(&to_free);
184
185         if (getenv(NO_REPLACE_OBJECTS_ENVIRONMENT))
186                 read_replace_refs = 0;
187         replace_ref_base = getenv(GIT_REPLACE_REF_BASE_ENVIRONMENT);
188         free(git_replace_ref_base);
189         git_replace_ref_base = xstrdup(replace_ref_base ? replace_ref_base
190                                                           : "refs/replace/");
191         free(git_namespace);
192         git_namespace = expand_namespace(getenv(GIT_NAMESPACE_ENVIRONMENT));
193         shallow_file = getenv(GIT_SHALLOW_FILE_ENVIRONMENT);
194         if (shallow_file)
195                 set_alternate_shallow_file(the_repository, shallow_file, 0);
196 }
197
198 int is_bare_repository(void)
199 {
200         /* if core.bare is not 'false', let's see if there is a work tree */
201         return is_bare_repository_cfg && !get_git_work_tree();
202 }
203
204 int have_git_dir(void)
205 {
206         return startup_info->have_repository
207                 || the_repository->gitdir;
208 }
209
210 const char *get_git_dir(void)
211 {
212         if (!the_repository->gitdir)
213                 BUG("git environment hasn't been setup");
214         return the_repository->gitdir;
215 }
216
217 const char *get_git_common_dir(void)
218 {
219         if (!the_repository->commondir)
220                 BUG("git environment hasn't been setup");
221         return the_repository->commondir;
222 }
223
224 const char *get_git_namespace(void)
225 {
226         if (!git_namespace)
227                 BUG("git environment hasn't been setup");
228         return git_namespace;
229 }
230
231 const char *strip_namespace(const char *namespaced_ref)
232 {
233         const char *out;
234         if (skip_prefix(namespaced_ref, get_git_namespace(), &out))
235                 return out;
236         return NULL;
237 }
238
239 const char *get_super_prefix(void)
240 {
241         static int initialized;
242         if (!initialized) {
243                 super_prefix = xstrdup_or_null(getenv(GIT_SUPER_PREFIX_ENVIRONMENT));
244                 initialized = 1;
245         }
246         return super_prefix;
247 }
248
249 static int git_work_tree_initialized;
250
251 /*
252  * Note.  This works only before you used a work tree.  This was added
253  * primarily to support git-clone to work in a new repository it just
254  * created, and is not meant to flip between different work trees.
255  */
256 void set_git_work_tree(const char *new_work_tree)
257 {
258         struct strbuf realpath = STRBUF_INIT;
259
260         if (git_work_tree_initialized) {
261                 strbuf_realpath(&realpath, new_work_tree, 1);
262                 new_work_tree = realpath.buf;
263                 if (strcmp(new_work_tree, the_repository->worktree))
264                         die("internal error: work tree has already been set\n"
265                             "Current worktree: %s\nNew worktree: %s",
266                             the_repository->worktree, new_work_tree);
267                 return;
268         }
269         git_work_tree_initialized = 1;
270         repo_set_worktree(the_repository, new_work_tree);
271
272         strbuf_release(&realpath);
273 }
274
275 const char *get_git_work_tree(void)
276 {
277         return the_repository->worktree;
278 }
279
280 char *get_object_directory(void)
281 {
282         if (!the_repository->objects->odb)
283                 BUG("git environment hasn't been setup");
284         return the_repository->objects->odb->path;
285 }
286
287 int odb_mkstemp(struct strbuf *temp_filename, const char *pattern)
288 {
289         int fd;
290         /*
291          * we let the umask do its job, don't try to be more
292          * restrictive except to remove write permission.
293          */
294         int mode = 0444;
295         git_path_buf(temp_filename, "objects/%s", pattern);
296         fd = git_mkstemp_mode(temp_filename->buf, mode);
297         if (0 <= fd)
298                 return fd;
299
300         /* slow path */
301         /* some mkstemp implementations erase temp_filename on failure */
302         git_path_buf(temp_filename, "objects/%s", pattern);
303         safe_create_leading_directories(temp_filename->buf);
304         return xmkstemp_mode(temp_filename->buf, mode);
305 }
306
307 int odb_pack_keep(const char *name)
308 {
309         int fd;
310
311         fd = open(name, O_RDWR|O_CREAT|O_EXCL, 0600);
312         if (0 <= fd)
313                 return fd;
314
315         /* slow path */
316         safe_create_leading_directories_const(name);
317         return open(name, O_RDWR|O_CREAT|O_EXCL, 0600);
318 }
319
320 char *get_index_file(void)
321 {
322         if (!the_repository->index_file)
323                 BUG("git environment hasn't been setup");
324         return the_repository->index_file;
325 }
326
327 char *get_graft_file(struct repository *r)
328 {
329         if (!r->graft_file)
330                 BUG("git environment hasn't been setup");
331         return r->graft_file;
332 }
333
334 static void set_git_dir_1(const char *path)
335 {
336         if (setenv(GIT_DIR_ENVIRONMENT, path, 1))
337                 die(_("could not set GIT_DIR to '%s'"), path);
338         setup_git_env(path);
339 }
340
341 static void update_relative_gitdir(const char *name,
342                                    const char *old_cwd,
343                                    const char *new_cwd,
344                                    void *data)
345 {
346         char *path = reparent_relative_path(old_cwd, new_cwd, get_git_dir());
347         trace_printf_key(&trace_setup_key,
348                          "setup: move $GIT_DIR to '%s'",
349                          path);
350         set_git_dir_1(path);
351         free(path);
352 }
353
354 void set_git_dir(const char *path, int make_realpath)
355 {
356         struct strbuf realpath = STRBUF_INIT;
357
358         if (make_realpath) {
359                 strbuf_realpath(&realpath, path, 1);
360                 path = realpath.buf;
361         }
362
363         set_git_dir_1(path);
364         if (!is_absolute_path(path))
365                 chdir_notify_register(NULL, update_relative_gitdir, NULL);
366
367         strbuf_release(&realpath);
368 }
369
370 const char *get_log_output_encoding(void)
371 {
372         return git_log_output_encoding ? git_log_output_encoding
373                 : get_commit_output_encoding();
374 }
375
376 const char *get_commit_output_encoding(void)
377 {
378         return git_commit_encoding ? git_commit_encoding : "UTF-8";
379 }
380
381 static int the_shared_repository = PERM_UMASK;
382 static int need_shared_repository_from_config = 1;
383
384 void set_shared_repository(int value)
385 {
386         the_shared_repository = value;
387         need_shared_repository_from_config = 0;
388 }
389
390 int get_shared_repository(void)
391 {
392         if (need_shared_repository_from_config) {
393                 const char *var = "core.sharedrepository";
394                 const char *value;
395                 if (!git_config_get_value(var, &value))
396                         the_shared_repository = git_config_perm(var, value);
397                 need_shared_repository_from_config = 0;
398         }
399         return the_shared_repository;
400 }
401
402 void reset_shared_repository(void)
403 {
404         need_shared_repository_from_config = 1;
405 }
406
407 int use_optional_locks(void)
408 {
409         return git_env_bool(GIT_OPTIONAL_LOCKS_ENVIRONMENT, 1);
410 }
411
412 int print_sha1_ellipsis(void)
413 {
414         /*
415          * Determine if the calling environment contains the variable
416          * GIT_PRINT_SHA1_ELLIPSIS set to "yes".
417          */
418         static int cached_result = -1; /* unknown */
419
420         if (cached_result < 0) {
421                 const char *v = getenv("GIT_PRINT_SHA1_ELLIPSIS");
422                 cached_result = (v && !strcasecmp(v, "yes"));
423         }
424         return cached_result;
425 }