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 = 7;
  20 int ignore_case;
  21 int assume_unchanged;
  22 int prefer_symlink_refs;
  23 int is_bare_repository_cfg = -1; /* unspecified */
  24 int log_all_ref_updates = -1; /* unspecified */
  25 int warn_ambiguous_refs = 1;
  26 int warn_on_object_refname_ambiguity = 1;
  27 int ref_paranoia = -1;
  28 int repository_format_precious_objects;
  29 const char *git_commit_encoding;
  30 const char *git_log_output_encoding;
  31 const char *apply_default_whitespace;
  32 const char *apply_default_ignorewhitespace;
  33 const char *git_attributes_file;
  34 int zlib_compression_level = Z_BEST_SPEED;
  35 int core_compression_level;
  36 int core_compression_seen;
  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 const char *pager_program;
  43 int pager_use_color = 1;
  44 const char *editor_program;
  45 const char *askpass_program;
  46 const char *excludes_file;
  47 enum auto_crlf auto_crlf = AUTO_CRLF_FALSE;
  48 int check_replace_refs = 1;
  49 char *git_replace_ref_base;
  50 enum eol core_eol = EOL_UNSET;
  51 enum safe_crlf safe_crlf = SAFE_CRLF_WARN;
  52 unsigned whitespace_rule_cfg = WS_DEFAULT_RULE;
  53 enum branch_track git_branch_track = BRANCH_TRACK_REMOTE;
  54 enum rebase_setup_type autorebase = AUTOREBASE_NEVER;
  55 enum push_default_type push_default = PUSH_DEFAULT_UNSPECIFIED;
  56 #ifndef OBJECT_CREATION_MODE
  57 #define OBJECT_CREATION_MODE OBJECT_CREATION_USES_HARDLINKS
  58 #endif
  59 enum object_creation_mode object_creation_mode = OBJECT_CREATION_MODE;
  60 char *notes_ref_name;
  61 int grafts_replace_parents = 1;
  62 int core_apply_sparse_checkout;
  63 int merge_log_config = -1;
  64 int precomposed_unicode = -1; /* see probe_utf8_pathname_composition() */
  65 unsigned long pack_size_limit_cfg;
  66
  67 #ifndef PROTECT_HFS_DEFAULT
  68 #define PROTECT_HFS_DEFAULT 0
  69 #endif
  70 int protect_hfs = PROTECT_HFS_DEFAULT;
  71
  72 #ifndef PROTECT_NTFS_DEFAULT
  73 #define PROTECT_NTFS_DEFAULT 0
  74 #endif
  75 int protect_ntfs = PROTECT_NTFS_DEFAULT;
  76
  77 /*
  78  * The character that begins a commented line in user-editable file
  79  * that is subject to stripspace.
  80  */
  81 char comment_line_char = '#';
  82 int auto_comment_line_char;
  83
  84 /* Parallel index stat data preload? */
  85 int core_preload_index = 1;
  86
  87 /*
  88  * This is a hack for test programs like test-dump-untracked-cache to
  89  * ensure that they do not modify the untracked cache when reading it.
  90  * Do not use it otherwise!
  91  */
  92 int ignore_untracked_cache_config;
  93
  94 /* This is set by setup_git_dir_gently() and/or git_default_config() */
  95 char *git_work_tree_cfg;
  96 static char *work_tree;
  97
  98 static const char *namespace;
  99 static size_t namespace_len;
 100
 101 static const char *git_dir, *git_common_dir;
 102 static char *git_object_dir, *git_index_file, *git_graft_file;
 103 int git_db_env, git_index_env, git_graft_env, git_common_dir_env;
 104
 105 /*
 106  * Repository-local GIT_* environment variables; see cache.h for details.
 107  */
 108 const char * const local_repo_env[] = {
 109         ALTERNATE_DB_ENVIRONMENT,
 110         CONFIG_ENVIRONMENT,
 111         CONFIG_DATA_ENVIRONMENT,
 112         DB_ENVIRONMENT,
 113         GIT_DIR_ENVIRONMENT,
 114         GIT_WORK_TREE_ENVIRONMENT,
 115         GIT_IMPLICIT_WORK_TREE_ENVIRONMENT,
 116         GRAFT_ENVIRONMENT,
 117         INDEX_ENVIRONMENT,
 118         NO_REPLACE_OBJECTS_ENVIRONMENT,
 119         GIT_REPLACE_REF_BASE_ENVIRONMENT,
 120         GIT_PREFIX_ENVIRONMENT,
 121         GIT_SHALLOW_FILE_ENVIRONMENT,
 122         GIT_COMMON_DIR_ENVIRONMENT,
 123         NULL
 124 };
 125
 126 static char *expand_namespace(const char *raw_namespace)
 127 {
 128         struct strbuf buf = STRBUF_INIT;
 129         struct strbuf **components, **c;
 130
 131         if (!raw_namespace || !*raw_namespace)
 132                 return xstrdup("");
 133
 134         strbuf_addstr(&buf, raw_namespace);
 135         components = strbuf_split(&buf, '/');
 136         strbuf_reset(&buf);
 137         for (c = components; *c; c++)
 138                 if (strcmp((*c)->buf, "/") != 0)
 139                         strbuf_addf(&buf, "refs/namespaces/%s", (*c)->buf);
 140         strbuf_list_free(components);
 141         if (check_refname_format(buf.buf, 0))
 142                 die("bad git namespace path \"%s\"", raw_namespace);
 143         strbuf_addch(&buf, '/');
 144         return strbuf_detach(&buf, NULL);
 145 }
 146
 147 static char *git_path_from_env(const char *envvar, const char *git_dir,
 148                                const char *path, int *fromenv)
 149 {
 150         const char *value = getenv(envvar);
 151         if (!value)
 152                 return xstrfmt("%s/%s", git_dir, path);
 153         if (fromenv)
 154                 *fromenv = 1;
 155         return xstrdup(value);
 156 }
 157
 158 static void setup_git_env(void)
 159 {
 160         struct strbuf sb = STRBUF_INIT;
 161         const char *gitfile;
 162         const char *shallow_file;
 163         const char *replace_ref_base;
 164
 165         git_dir = getenv(GIT_DIR_ENVIRONMENT);
 166         if (!git_dir)
 167                 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
 168         gitfile = read_gitfile(git_dir);
 169         git_dir = xstrdup(gitfile ? gitfile : git_dir);
 170         if (get_common_dir(&sb, git_dir))
 171                 git_common_dir_env = 1;
 172         git_common_dir = strbuf_detach(&sb, NULL);
 173         git_object_dir = git_path_from_env(DB_ENVIRONMENT, git_common_dir,
 174                                            "objects", &git_db_env);
 175         git_index_file = git_path_from_env(INDEX_ENVIRONMENT, git_dir,
 176                                            "index", &git_index_env);
 177         git_graft_file = git_path_from_env(GRAFT_ENVIRONMENT, git_common_dir,
 178                                            "info/grafts", &git_graft_env);
 179         if (getenv(NO_REPLACE_OBJECTS_ENVIRONMENT))
 180                 check_replace_refs = 0;
 181         replace_ref_base = getenv(GIT_REPLACE_REF_BASE_ENVIRONMENT);
 182         git_replace_ref_base = xstrdup(replace_ref_base ? replace_ref_base
 183                                                           : "refs/replace/");
 184         namespace = expand_namespace(getenv(GIT_NAMESPACE_ENVIRONMENT));
 185         namespace_len = strlen(namespace);
 186         shallow_file = getenv(GIT_SHALLOW_FILE_ENVIRONMENT);
 187         if (shallow_file)
 188                 set_alternate_shallow_file(shallow_file, 0);
 189 }
 190
 191 int is_bare_repository(void)
 192 {
 193         /* if core.bare is not 'false', let's see if there is a work tree */
 194         return is_bare_repository_cfg && !get_git_work_tree();
 195 }
 196
 197 const char *get_git_dir(void)
 198 {
 199         if (!git_dir)
 200                 setup_git_env();
 201         return git_dir;
 202 }
 203
 204 const char *get_git_common_dir(void)
 205 {
 206         return git_common_dir;
 207 }
 208
 209 const char *get_git_namespace(void)
 210 {
 211         if (!namespace)
 212                 setup_git_env();
 213         return namespace;
 214 }
 215
 216 const char *strip_namespace(const char *namespaced_ref)
 217 {
 218         if (!starts_with(namespaced_ref, get_git_namespace()))
 219                 return NULL;
 220         return namespaced_ref + namespace_len;
 221 }
 222
 223 static int git_work_tree_initialized;
 224
 225 /*
 226  * Note.  This works only before you used a work tree.  This was added
 227  * primarily to support git-clone to work in a new repository it just
 228  * created, and is not meant to flip between different work trees.
 229  */
 230 void set_git_work_tree(const char *new_work_tree)
 231 {
 232         if (git_work_tree_initialized) {
 233                 new_work_tree = real_path(new_work_tree);
 234                 if (strcmp(new_work_tree, work_tree))
 235                         die("internal error: work tree has already been set\n"
 236                             "Current worktree: %s\nNew worktree: %s",
 237                             work_tree, new_work_tree);
 238                 return;
 239         }
 240         git_work_tree_initialized = 1;
 241         work_tree = xstrdup(real_path(new_work_tree));
 242 }
 243
 244 const char *get_git_work_tree(void)
 245 {
 246         return work_tree;
 247 }
 248
 249 char *get_object_directory(void)
 250 {
 251         if (!git_object_dir)
 252                 setup_git_env();
 253         return git_object_dir;
 254 }
 255
 256 int odb_mkstemp(char *template, size_t limit, const char *pattern)
 257 {
 258         int fd;
 259         /*
 260          * we let the umask do its job, don't try to be more
 261          * restrictive except to remove write permission.
 262          */
 263         int mode = 0444;
 264         snprintf(template, limit, "%s/%s",
 265                  get_object_directory(), pattern);
 266         fd = git_mkstemp_mode(template, mode);
 267         if (0 <= fd)
 268                 return fd;
 269
 270         /* slow path */
 271         /* some mkstemp implementations erase template on failure */
 272         snprintf(template, limit, "%s/%s",
 273                  get_object_directory(), pattern);
 274         safe_create_leading_directories(template);
 275         return xmkstemp_mode(template, mode);
 276 }
 277
 278 int odb_pack_keep(char *name, size_t namesz, const unsigned char *sha1)
 279 {
 280         int fd;
 281
 282         snprintf(name, namesz, "%s/pack/pack-%s.keep",
 283                  get_object_directory(), sha1_to_hex(sha1));
 284         fd = open(name, O_RDWR|O_CREAT|O_EXCL, 0600);
 285         if (0 <= fd)
 286                 return fd;
 287
 288         /* slow path */
 289         safe_create_leading_directories(name);
 290         return open(name, O_RDWR|O_CREAT|O_EXCL, 0600);
 291 }
 292
 293 char *get_index_file(void)
 294 {
 295         if (!git_index_file)
 296                 setup_git_env();
 297         return git_index_file;
 298 }
 299
 300 char *get_graft_file(void)
 301 {
 302         if (!git_graft_file)
 303                 setup_git_env();
 304         return git_graft_file;
 305 }
 306
 307 int set_git_dir(const char *path)
 308 {
 309         if (setenv(GIT_DIR_ENVIRONMENT, path, 1))
 310                 return error("Could not set GIT_DIR to '%s'", path);
 311         setup_git_env();
 312         return 0;
 313 }
 314
 315 const char *get_log_output_encoding(void)
 316 {
 317         return git_log_output_encoding ? git_log_output_encoding
 318                 : get_commit_output_encoding();
 319 }
 320
 321 const char *get_commit_output_encoding(void)
 322 {
 323         return git_commit_encoding ? git_commit_encoding : "UTF-8";
 324 }
 325
 326 static int the_shared_repository = PERM_UMASK;
 327 static int need_shared_repository_from_config = 1;
 328
 329 void set_shared_repository(int value)
 330 {
 331         the_shared_repository = value;
 332         need_shared_repository_from_config = 0;
 333 }
 334
 335 int get_shared_repository(void)
 336 {
 337         if (need_shared_repository_from_config) {
 338                 const char *var = "core.sharedrepository";
 339                 const char *value;
 340                 if (!git_config_get_value(var, &value))
 341                         the_shared_repository = git_config_perm(var, value);
 342                 need_shared_repository_from_config = 0;
 343         }
 344         return the_shared_repository;
 345 }