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(const char *name)
 303 {
 304         int fd;
 305
 306         fd = open(name, O_RDWR|O_CREAT|O_EXCL, 0600);
 307         if (0 <= fd)
 308                 return fd;
 309
 310         /* slow path */
 311         safe_create_leading_directories_const(name);
 312         return open(name, O_RDWR|O_CREAT|O_EXCL, 0600);
 313 }
 314
 315 char *get_index_file(void)
 316 {
 317         if (!git_index_file)
 318                 setup_git_env();
 319         return git_index_file;
 320 }
 321
 322 char *get_graft_file(void)
 323 {
 324         if (!git_graft_file)
 325                 setup_git_env();
 326         return git_graft_file;
 327 }
 328
 329 int set_git_dir(const char *path)
 330 {
 331         if (setenv(GIT_DIR_ENVIRONMENT, path, 1))
 332                 return error("Could not set GIT_DIR to '%s'", path);
 333         setup_git_env();
 334         return 0;
 335 }
 336
 337 const char *get_log_output_encoding(void)
 338 {
 339         return git_log_output_encoding ? git_log_output_encoding
 340                 : get_commit_output_encoding();
 341 }
 342
 343 const char *get_commit_output_encoding(void)
 344 {
 345         return git_commit_encoding ? git_commit_encoding : "UTF-8";
 346 }
 347
 348 static int the_shared_repository = PERM_UMASK;
 349 static int need_shared_repository_from_config = 1;
 350
 351 void set_shared_repository(int value)
 352 {
 353         the_shared_repository = value;
 354         need_shared_repository_from_config = 0;
 355 }
 356
 357 int get_shared_repository(void)
 358 {
 359         if (need_shared_repository_from_config) {
 360                 const char *var = "core.sharedrepository";
 361                 const char *value;
 362                 if (!git_config_get_value(var, &value))
 363                         the_shared_repository = git_config_perm(var, value);
 364                 need_shared_repository_from_config = 0;
 365         }
 366         return the_shared_repository;
 367 }
 368
 369 void reset_shared_repository(void)
 370 {
 371         need_shared_repository_from_config = 1;
 372 }