Merge branch 'jk/rev-parse-cleanup' into next
[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 "refs.h"
12 #include "fmt-merge-msg.h"
13 #include "commit.h"
14
15 int trust_executable_bit = 1;
16 int trust_ctime = 1;
17 int check_stat = 1;
18 int has_symlinks = 1;
19 int minimum_abbrev = 4, default_abbrev = -1;
20 int ignore_case;
21 int assume_unchanged;
22 int prefer_symlink_refs;
23 int is_bare_repository_cfg = -1; /* unspecified */
24 int warn_ambiguous_refs = 1;
25 int warn_on_object_refname_ambiguity = 1;
26 int ref_paranoia = -1;
27 int repository_format_precious_objects;
28 const char *git_commit_encoding;
29 const char *git_log_output_encoding;
30 const char *apply_default_whitespace;
31 const char *apply_default_ignorewhitespace;
32 const char *git_attributes_file;
33 const char *git_hooks_path;
34 int zlib_compression_level = Z_BEST_SPEED;
35 int core_compression_level;
36 int pack_compression_level = Z_DEFAULT_COMPRESSION;
37 int fsync_object_files;
38 size_t packed_git_window_size = DEFAULT_PACKED_GIT_WINDOW_SIZE;
39 size_t packed_git_limit = DEFAULT_PACKED_GIT_LIMIT;
40 size_t delta_base_cache_limit = 96 * 1024 * 1024;
41 unsigned long big_file_threshold = 512 * 1024 * 1024;
42 int pager_use_color = 1;
43 const char *editor_program;
44 const char *askpass_program;
45 const char *excludes_file;
46 enum auto_crlf auto_crlf = AUTO_CRLF_FALSE;
47 int check_replace_refs = 1;
48 char *git_replace_ref_base;
49 enum eol core_eol = EOL_UNSET;
50 enum safe_crlf safe_crlf = SAFE_CRLF_WARN;
51 unsigned whitespace_rule_cfg = WS_DEFAULT_RULE;
52 enum branch_track git_branch_track = BRANCH_TRACK_REMOTE;
53 enum rebase_setup_type autorebase = AUTOREBASE_NEVER;
54 enum push_default_type push_default = PUSH_DEFAULT_UNSPECIFIED;
55 #ifndef OBJECT_CREATION_MODE
56 #define OBJECT_CREATION_MODE OBJECT_CREATION_USES_HARDLINKS
57 #endif
58 enum object_creation_mode object_creation_mode = OBJECT_CREATION_MODE;
59 char *notes_ref_name;
60 int grafts_replace_parents = 1;
61 int core_apply_sparse_checkout;
62 int merge_log_config = -1;
63 int precomposed_unicode = -1; /* see probe_utf8_pathname_composition() */
64 unsigned long pack_size_limit_cfg;
65 enum hide_dotfiles_type hide_dotfiles = HIDE_DOTFILES_DOTGITONLY;
66 enum log_refs_config log_all_ref_updates = LOG_REFS_UNSET;
67
68 #ifndef PROTECT_HFS_DEFAULT
69 #define PROTECT_HFS_DEFAULT 0
70 #endif
71 int protect_hfs = PROTECT_HFS_DEFAULT;
72
73 #ifndef PROTECT_NTFS_DEFAULT
74 #define PROTECT_NTFS_DEFAULT 0
75 #endif
76 int protect_ntfs = PROTECT_NTFS_DEFAULT;
77
78 /*
79  * The character that begins a commented line in user-editable file
80  * that is subject to stripspace.
81  */
82 char comment_line_char = '#';
83 int auto_comment_line_char;
84
85 /* Parallel index stat data preload? */
86 int core_preload_index = 1;
87
88 /*
89  * This is a hack for test programs like test-dump-untracked-cache to
90  * ensure that they do not modify the untracked cache when reading it.
91  * Do not use it otherwise!
92  */
93 int ignore_untracked_cache_config;
94
95 /* This is set by setup_git_dir_gently() and/or git_default_config() */
96 char *git_work_tree_cfg;
97 static char *work_tree;
98
99 static const char *namespace;
100 static size_t namespace_len;
101
102 static const char *super_prefix;
103
104 static const char *git_dir, *git_common_dir;
105 static char *git_object_dir, *git_index_file, *git_graft_file;
106 int git_db_env, git_index_env, git_graft_env, git_common_dir_env;
107
108 /*
109  * Repository-local GIT_* environment variables; see cache.h for details.
110  */
111 const char * const local_repo_env[] = {
112         ALTERNATE_DB_ENVIRONMENT,
113         CONFIG_ENVIRONMENT,
114         CONFIG_DATA_ENVIRONMENT,
115         DB_ENVIRONMENT,
116         GIT_DIR_ENVIRONMENT,
117         GIT_WORK_TREE_ENVIRONMENT,
118         GIT_IMPLICIT_WORK_TREE_ENVIRONMENT,
119         GRAFT_ENVIRONMENT,
120         INDEX_ENVIRONMENT,
121         NO_REPLACE_OBJECTS_ENVIRONMENT,
122         GIT_REPLACE_REF_BASE_ENVIRONMENT,
123         GIT_PREFIX_ENVIRONMENT,
124         GIT_SUPER_PREFIX_ENVIRONMENT,
125         GIT_SHALLOW_FILE_ENVIRONMENT,
126         GIT_COMMON_DIR_ENVIRONMENT,
127         NULL
128 };
129
130 static char *expand_namespace(const char *raw_namespace)
131 {
132         struct strbuf buf = STRBUF_INIT;
133         struct strbuf **components, **c;
134
135         if (!raw_namespace || !*raw_namespace)
136                 return xstrdup("");
137
138         strbuf_addstr(&buf, raw_namespace);
139         components = strbuf_split(&buf, '/');
140         strbuf_reset(&buf);
141         for (c = components; *c; c++)
142                 if (strcmp((*c)->buf, "/") != 0)
143                         strbuf_addf(&buf, "refs/namespaces/%s", (*c)->buf);
144         strbuf_list_free(components);
145         if (check_refname_format(buf.buf, 0))
146                 die("bad git namespace path \"%s\"", raw_namespace);
147         strbuf_addch(&buf, '/');
148         return strbuf_detach(&buf, NULL);
149 }
150
151 static char *git_path_from_env(const char *envvar, const char *git_dir,
152                                const char *path, int *fromenv)
153 {
154         const char *value = getenv(envvar);
155         if (!value)
156                 return xstrfmt("%s/%s", git_dir, path);
157         if (fromenv)
158                 *fromenv = 1;
159         return xstrdup(value);
160 }
161
162 static void setup_git_env(void)
163 {
164         struct strbuf sb = STRBUF_INIT;
165         const char *gitfile;
166         const char *shallow_file;
167         const char *replace_ref_base;
168
169         git_dir = getenv(GIT_DIR_ENVIRONMENT);
170         if (!git_dir) {
171                 if (!startup_info->have_repository)
172                         die("BUG: setup_git_env called without repository");
173                 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
174         }
175         gitfile = read_gitfile(git_dir);
176         git_dir = xstrdup(gitfile ? gitfile : git_dir);
177         if (get_common_dir(&sb, git_dir))
178                 git_common_dir_env = 1;
179         git_common_dir = strbuf_detach(&sb, NULL);
180         git_object_dir = git_path_from_env(DB_ENVIRONMENT, git_common_dir,
181                                            "objects", &git_db_env);
182         git_index_file = git_path_from_env(INDEX_ENVIRONMENT, git_dir,
183                                            "index", &git_index_env);
184         git_graft_file = git_path_from_env(GRAFT_ENVIRONMENT, git_common_dir,
185                                            "info/grafts", &git_graft_env);
186         if (getenv(NO_REPLACE_OBJECTS_ENVIRONMENT))
187                 check_replace_refs = 0;
188         replace_ref_base = getenv(GIT_REPLACE_REF_BASE_ENVIRONMENT);
189         git_replace_ref_base = xstrdup(replace_ref_base ? replace_ref_base
190                                                           : "refs/replace/");
191         namespace = expand_namespace(getenv(GIT_NAMESPACE_ENVIRONMENT));
192         namespace_len = strlen(namespace);
193         shallow_file = getenv(GIT_SHALLOW_FILE_ENVIRONMENT);
194         if (shallow_file)
195                 set_alternate_shallow_file(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                 || git_dir
208                 || getenv(GIT_DIR_ENVIRONMENT);
209 }
210
211 const char *get_git_dir(void)
212 {
213         if (!git_dir)
214                 setup_git_env();
215         return git_dir;
216 }
217
218 const char *get_git_common_dir(void)
219 {
220         return git_common_dir;
221 }
222
223 const char *get_git_namespace(void)
224 {
225         if (!namespace)
226                 setup_git_env();
227         return namespace;
228 }
229
230 const char *strip_namespace(const char *namespaced_ref)
231 {
232         if (!starts_with(namespaced_ref, get_git_namespace()))
233                 return NULL;
234         return namespaced_ref + namespace_len;
235 }
236
237 const char *get_super_prefix(void)
238 {
239         static int initialized;
240         if (!initialized) {
241                 super_prefix = getenv(GIT_SUPER_PREFIX_ENVIRONMENT);
242                 initialized = 1;
243         }
244         return super_prefix;
245 }
246
247 static int git_work_tree_initialized;
248
249 /*
250  * Note.  This works only before you used a work tree.  This was added
251  * primarily to support git-clone to work in a new repository it just
252  * created, and is not meant to flip between different work trees.
253  */
254 void set_git_work_tree(const char *new_work_tree)
255 {
256         if (git_work_tree_initialized) {
257                 new_work_tree = real_path(new_work_tree);
258                 if (strcmp(new_work_tree, work_tree))
259                         die("internal error: work tree has already been set\n"
260                             "Current worktree: %s\nNew worktree: %s",
261                             work_tree, new_work_tree);
262                 return;
263         }
264         git_work_tree_initialized = 1;
265         work_tree = real_pathdup(new_work_tree, 1);
266 }
267
268 const char *get_git_work_tree(void)
269 {
270         return work_tree;
271 }
272
273 char *get_object_directory(void)
274 {
275         if (!git_object_dir)
276                 setup_git_env();
277         return git_object_dir;
278 }
279
280 int odb_mkstemp(char *template, size_t limit, const char *pattern)
281 {
282         int fd;
283         /*
284          * we let the umask do its job, don't try to be more
285          * restrictive except to remove write permission.
286          */
287         int mode = 0444;
288         snprintf(template, limit, "%s/%s",
289                  get_object_directory(), pattern);
290         fd = git_mkstemp_mode(template, mode);
291         if (0 <= fd)
292                 return fd;
293
294         /* slow path */
295         /* some mkstemp implementations erase template on failure */
296         snprintf(template, limit, "%s/%s",
297                  get_object_directory(), pattern);
298         safe_create_leading_directories(template);
299         return xmkstemp_mode(template, mode);
300 }
301
302 int odb_pack_keep(char *name, size_t namesz, const unsigned char *sha1)
303 {
304         int fd;
305
306         snprintf(name, namesz, "%s/pack/pack-%s.keep",
307                  get_object_directory(), sha1_to_hex(sha1));
308         fd = open(name, O_RDWR|O_CREAT|O_EXCL, 0600);
309         if (0 <= fd)
310                 return fd;
311
312         /* slow path */
313         safe_create_leading_directories(name);
314         return open(name, O_RDWR|O_CREAT|O_EXCL, 0600);
315 }
316
317 char *get_index_file(void)
318 {
319         if (!git_index_file)
320                 setup_git_env();
321         return git_index_file;
322 }
323
324 char *get_graft_file(void)
325 {
326         if (!git_graft_file)
327                 setup_git_env();
328         return git_graft_file;
329 }
330
331 int set_git_dir(const char *path)
332 {
333         if (setenv(GIT_DIR_ENVIRONMENT, path, 1))
334                 return error("Could not set GIT_DIR to '%s'", path);
335         setup_git_env();
336         return 0;
337 }
338
339 const char *get_log_output_encoding(void)
340 {
341         return git_log_output_encoding ? git_log_output_encoding
342                 : get_commit_output_encoding();
343 }
344
345 const char *get_commit_output_encoding(void)
346 {
347         return git_commit_encoding ? git_commit_encoding : "UTF-8";
348 }
349
350 static int the_shared_repository = PERM_UMASK;
351 static int need_shared_repository_from_config = 1;
352
353 void set_shared_repository(int value)
354 {
355         the_shared_repository = value;
356         need_shared_repository_from_config = 0;
357 }
358
359 int get_shared_repository(void)
360 {
361         if (need_shared_repository_from_config) {
362                 const char *var = "core.sharedrepository";
363                 const char *value;
364                 if (!git_config_get_value(var, &value))
365                         the_shared_repository = git_config_perm(var, value);
366                 need_shared_repository_from_config = 0;
367         }
368         return the_shared_repository;
369 }
370
371 void reset_shared_repository(void)
372 {
373         need_shared_repository_from_config = 1;
374 }