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