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