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_version;
  29 const char *git_commit_encoding;
  30 const char *git_log_output_encoding;
  31 int shared_repository = PERM_UMASK;
  32 const char *apply_default_whitespace;
  33 const char *apply_default_ignorewhitespace;
  34 const char *git_attributes_file;
  35 int zlib_compression_level = Z_BEST_SPEED;
  36 int core_compression_level;
  37 int core_compression_seen;
  38 int fsync_object_files;
  39 size_t packed_git_window_size = DEFAULT_PACKED_GIT_WINDOW_SIZE;
  40 size_t packed_git_limit = DEFAULT_PACKED_GIT_LIMIT;
  41 size_t delta_base_cache_limit = 96 * 1024 * 1024;
  42 unsigned long big_file_threshold = 512 * 1024 * 1024;
  43 const char *pager_program;
  44 int pager_use_color = 1;
  45 const char *editor_program;
  46 const char *askpass_program;
  47 const char *excludes_file;
  48 enum auto_crlf auto_crlf = AUTO_CRLF_FALSE;
  49 int check_replace_refs = 1;
  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 struct startup_info *startup_info;
  66 unsigned long pack_size_limit_cfg;
  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 /* This is set by setup_git_dir_gently() and/or git_default_config() */
  89 char *git_work_tree_cfg;
  90 static char *work_tree;
  91
  92 static const char *namespace;
  93 static size_t namespace_len;
  94
  95 static const char *git_dir, *git_common_dir;
  96 static char *git_object_dir, *git_index_file, *git_graft_file;
  97 int git_db_env, git_index_env, git_graft_env, git_common_dir_env;
  98
  99 /*
 100  * Repository-local GIT_* environment variables; see cache.h for details.
 101  */
 102 const char * const local_repo_env[] = {
 103         ALTERNATE_DB_ENVIRONMENT,
 104         CONFIG_ENVIRONMENT,
 105         CONFIG_DATA_ENVIRONMENT,
 106         DB_ENVIRONMENT,
 107         GIT_DIR_ENVIRONMENT,
 108         GIT_WORK_TREE_ENVIRONMENT,
 109         GIT_IMPLICIT_WORK_TREE_ENVIRONMENT,
 110         GRAFT_ENVIRONMENT,
 111         INDEX_ENVIRONMENT,
 112         NO_REPLACE_OBJECTS_ENVIRONMENT,
 113         GIT_PREFIX_ENVIRONMENT,
 114         GIT_SHALLOW_FILE_ENVIRONMENT,
 115         GIT_COMMON_DIR_ENVIRONMENT,
 116         NULL
 117 };
 118
 119 static char *expand_namespace(const char *raw_namespace)
 120 {
 121         struct strbuf buf = STRBUF_INIT;
 122         struct strbuf **components, **c;
 123
 124         if (!raw_namespace || !*raw_namespace)
 125                 return xstrdup("");
 126
 127         strbuf_addstr(&buf, raw_namespace);
 128         components = strbuf_split(&buf, '/');
 129         strbuf_reset(&buf);
 130         for (c = components; *c; c++)
 131                 if (strcmp((*c)->buf, "/") != 0)
 132                         strbuf_addf(&buf, "refs/namespaces/%s", (*c)->buf);
 133         strbuf_list_free(components);
 134         if (check_refname_format(buf.buf, 0))
 135                 die("bad git namespace path \"%s\"", raw_namespace);
 136         strbuf_addch(&buf, '/');
 137         return strbuf_detach(&buf, NULL);
 138 }
 139
 140 static char *git_path_from_env(const char *envvar, const char *git_dir,
 141                                const char *path, int *fromenv)
 142 {
 143         const char *value = getenv(envvar);
 144         if (!value) {
 145                 char *buf = xmalloc(strlen(git_dir) + strlen(path) + 2);
 146                 sprintf(buf, "%s/%s", git_dir, path);
 147                 return buf;
 148         }
 149         if (fromenv)
 150                 *fromenv = 1;
 151         return xstrdup(value);
 152 }
 153
 154 static void setup_git_env(void)
 155 {
 156         struct strbuf sb = STRBUF_INIT;
 157         const char *gitfile;
 158         const char *shallow_file;
 159
 160         git_dir = getenv(GIT_DIR_ENVIRONMENT);
 161         if (!git_dir)
 162                 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
 163         gitfile = read_gitfile(git_dir);
 164         git_dir = xstrdup(gitfile ? gitfile : git_dir);
 165         if (get_common_dir(&sb, git_dir))
 166                 git_common_dir_env = 1;
 167         git_common_dir = strbuf_detach(&sb, NULL);
 168         git_object_dir = git_path_from_env(DB_ENVIRONMENT, git_common_dir,
 169                                            "objects", &git_db_env);
 170         git_index_file = git_path_from_env(INDEX_ENVIRONMENT, git_dir,
 171                                            "index", &git_index_env);
 172         git_graft_file = git_path_from_env(GRAFT_ENVIRONMENT, git_common_dir,
 173                                            "info/grafts", &git_graft_env);
 174         if (getenv(NO_REPLACE_OBJECTS_ENVIRONMENT))
 175                 check_replace_refs = 0;
 176         namespace = expand_namespace(getenv(GIT_NAMESPACE_ENVIRONMENT));
 177         namespace_len = strlen(namespace);
 178         shallow_file = getenv(GIT_SHALLOW_FILE_ENVIRONMENT);
 179         if (shallow_file)
 180                 set_alternate_shallow_file(shallow_file, 0);
 181 }
 182
 183 int is_bare_repository(void)
 184 {
 185         /* if core.bare is not 'false', let's see if there is a work tree */
 186         return is_bare_repository_cfg && !get_git_work_tree();
 187 }
 188
 189 const char *get_git_dir(void)
 190 {
 191         if (!git_dir)
 192                 setup_git_env();
 193         return git_dir;
 194 }
 195
 196 const char *get_git_common_dir(void)
 197 {
 198         return git_common_dir;
 199 }
 200
 201 const char *get_git_namespace(void)
 202 {
 203         if (!namespace)
 204                 setup_git_env();
 205         return namespace;
 206 }
 207
 208 const char *strip_namespace(const char *namespaced_ref)
 209 {
 210         if (!starts_with(namespaced_ref, get_git_namespace()))
 211                 return NULL;
 212         return namespaced_ref + namespace_len;
 213 }
 214
 215 static int git_work_tree_initialized;
 216
 217 /*
 218  * Note.  This works only before you used a work tree.  This was added
 219  * primarily to support git-clone to work in a new repository it just
 220  * created, and is not meant to flip between different work trees.
 221  */
 222 void set_git_work_tree(const char *new_work_tree)
 223 {
 224         if (git_work_tree_initialized) {
 225                 new_work_tree = real_path(new_work_tree);
 226                 if (strcmp(new_work_tree, work_tree))
 227                         die("internal error: work tree has already been set\n"
 228                             "Current worktree: %s\nNew worktree: %s",
 229                             work_tree, new_work_tree);
 230                 return;
 231         }
 232         git_work_tree_initialized = 1;
 233         work_tree = xstrdup(real_path(new_work_tree));
 234 }
 235
 236 const char *get_git_work_tree(void)
 237 {
 238         return work_tree;
 239 }
 240
 241 char *get_object_directory(void)
 242 {
 243         if (!git_object_dir)
 244                 setup_git_env();
 245         return git_object_dir;
 246 }
 247
 248 int odb_mkstemp(char *template, size_t limit, const char *pattern)
 249 {
 250         int fd;
 251         /*
 252          * we let the umask do its job, don't try to be more
 253          * restrictive except to remove write permission.
 254          */
 255         int mode = 0444;
 256         snprintf(template, limit, "%s/%s",
 257                  get_object_directory(), pattern);
 258         fd = git_mkstemp_mode(template, mode);
 259         if (0 <= fd)
 260                 return fd;
 261
 262         /* slow path */
 263         /* some mkstemp implementations erase template on failure */
 264         snprintf(template, limit, "%s/%s",
 265                  get_object_directory(), pattern);
 266         safe_create_leading_directories(template);
 267         return xmkstemp_mode(template, mode);
 268 }
 269
 270 int odb_pack_keep(char *name, size_t namesz, const unsigned char *sha1)
 271 {
 272         int fd;
 273
 274         snprintf(name, namesz, "%s/pack/pack-%s.keep",
 275                  get_object_directory(), sha1_to_hex(sha1));
 276         fd = open(name, O_RDWR|O_CREAT|O_EXCL, 0600);
 277         if (0 <= fd)
 278                 return fd;
 279
 280         /* slow path */
 281         safe_create_leading_directories(name);
 282         return open(name, O_RDWR|O_CREAT|O_EXCL, 0600);
 283 }
 284
 285 char *get_index_file(void)
 286 {
 287         if (!git_index_file)
 288                 setup_git_env();
 289         return git_index_file;
 290 }
 291
 292 char *get_graft_file(void)
 293 {
 294         if (!git_graft_file)
 295                 setup_git_env();
 296         return git_graft_file;
 297 }
 298
 299 int set_git_dir(const char *path)
 300 {
 301         if (setenv(GIT_DIR_ENVIRONMENT, path, 1))
 302                 return error("Could not set GIT_DIR to '%s'", path);
 303         setup_git_env();
 304         return 0;
 305 }
 306
 307 const char *get_log_output_encoding(void)
 308 {
 309         return git_log_output_encoding ? git_log_output_encoding
 310                 : get_commit_output_encoding();
 311 }
 312
 313 const char *get_commit_output_encoding(void)
 314 {
 315         return git_commit_encoding ? git_commit_encoding : "UTF-8";
 316 }