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