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 int repository_format_precious_objects;
  30 const char *git_commit_encoding;
  31 const char *git_log_output_encoding;
  32 int shared_repository = PERM_UMASK;
  33 const char *apply_default_whitespace;
  34 const char *apply_default_ignorewhitespace;
  35 const char *git_attributes_file;
  36 int zlib_compression_level = Z_BEST_SPEED;
  37 int core_compression_level;
  38 int core_compression_seen;
  39 int fsync_object_files;
  40 size_t packed_git_window_size = DEFAULT_PACKED_GIT_WINDOW_SIZE;
  41 size_t packed_git_limit = DEFAULT_PACKED_GIT_LIMIT;
  42 size_t delta_base_cache_limit = 96 * 1024 * 1024;
  43 unsigned long big_file_threshold = 512 * 1024 * 1024;
  44 const char *pager_program;
  45 int pager_use_color = 1;
  46 const char *editor_program;
  47 const char *askpass_program;
  48 const char *excludes_file;
  49 enum auto_crlf auto_crlf = AUTO_CRLF_FALSE;
  50 int check_replace_refs = 1;
  51 char *git_replace_ref_base;
  52 enum eol core_eol = EOL_UNSET;
  53 enum safe_crlf safe_crlf = SAFE_CRLF_WARN;
  54 unsigned whitespace_rule_cfg = WS_DEFAULT_RULE;
  55 enum branch_track git_branch_track = BRANCH_TRACK_REMOTE;
  56 enum rebase_setup_type autorebase = AUTOREBASE_NEVER;
  57 enum push_default_type push_default = PUSH_DEFAULT_UNSPECIFIED;
  58 #ifndef OBJECT_CREATION_MODE
  59 #define OBJECT_CREATION_MODE OBJECT_CREATION_USES_HARDLINKS
  60 #endif
  61 enum object_creation_mode object_creation_mode = OBJECT_CREATION_MODE;
  62 char *notes_ref_name;
  63 int grafts_replace_parents = 1;
  64 int core_apply_sparse_checkout;
  65 int merge_log_config = -1;
  66 int precomposed_unicode = -1; /* see probe_utf8_pathname_composition() */
  67 struct startup_info *startup_info;
  68 unsigned long pack_size_limit_cfg;
  69 enum hide_dotfiles_type hide_dotfiles = HIDE_DOTFILES_DOTGITONLY;
  70
  71 #ifndef PROTECT_HFS_DEFAULT
  72 #define PROTECT_HFS_DEFAULT 0
  73 #endif
  74 int protect_hfs = PROTECT_HFS_DEFAULT;
  75
  76 #ifndef PROTECT_NTFS_DEFAULT
  77 #define PROTECT_NTFS_DEFAULT 0
  78 #endif
  79 int protect_ntfs = PROTECT_NTFS_DEFAULT;
  80
  81 /*
  82  * The character that begins a commented line in user-editable file
  83  * that is subject to stripspace.
  84  */
  85 char comment_line_char = '#';
  86 int auto_comment_line_char;
  87
  88 /* Parallel index stat data preload? */
  89 int core_preload_index = 1;
  90
  91 /*
  92  * This is a hack for test programs like test-dump-untracked-cache to
  93  * ensure that they do not modify the untracked cache when reading it.
  94  * Do not use it otherwise!
  95  */
  96 int ignore_untracked_cache_config;
  97
  98 /* This is set by setup_git_dir_gently() and/or git_default_config() */
  99 char *git_work_tree_cfg;
 100 static char *work_tree;
 101
 102 static const char *namespace;
 103 static size_t namespace_len;
 104
 105 static const char *git_dir, *git_common_dir;
 106 static char *git_object_dir, *git_index_file, *git_graft_file;
 107 int git_db_env, git_index_env, git_graft_env, git_common_dir_env;
 108
 109 /*
 110  * Repository-local GIT_* environment variables; see cache.h for details.
 111  */
 112 const char * const local_repo_env[] = {
 113         ALTERNATE_DB_ENVIRONMENT,
 114         CONFIG_ENVIRONMENT,
 115         CONFIG_DATA_ENVIRONMENT,
 116         DB_ENVIRONMENT,
 117         GIT_DIR_ENVIRONMENT,
 118         GIT_WORK_TREE_ENVIRONMENT,
 119         GIT_IMPLICIT_WORK_TREE_ENVIRONMENT,
 120         GRAFT_ENVIRONMENT,
 121         INDEX_ENVIRONMENT,
 122         NO_REPLACE_OBJECTS_ENVIRONMENT,
 123         GIT_REPLACE_REF_BASE_ENVIRONMENT,
 124         GIT_PREFIX_ENVIRONMENT,
 125         GIT_SHALLOW_FILE_ENVIRONMENT,
 126         GIT_COMMON_DIR_ENVIRONMENT,
 127         NULL
 128 };
 129
 130 static char *expand_namespace(const char *raw_namespace)
 131 {
 132         struct strbuf buf = STRBUF_INIT;
 133         struct strbuf **components, **c;
 134
 135         if (!raw_namespace || !*raw_namespace)
 136                 return xstrdup("");
 137
 138         strbuf_addstr(&buf, raw_namespace);
 139         components = strbuf_split(&buf, '/');
 140         strbuf_reset(&buf);
 141         for (c = components; *c; c++)
 142                 if (strcmp((*c)->buf, "/") != 0)
 143                         strbuf_addf(&buf, "refs/namespaces/%s", (*c)->buf);
 144         strbuf_list_free(components);
 145         if (check_refname_format(buf.buf, 0))
 146                 die("bad git namespace path \"%s\"", raw_namespace);
 147         strbuf_addch(&buf, '/');
 148         return strbuf_detach(&buf, NULL);
 149 }
 150
 151 static char *git_path_from_env(const char *envvar, const char *git_dir,
 152                                const char *path, int *fromenv)
 153 {
 154         const char *value = getenv(envvar);
 155         if (!value)
 156                 return xstrfmt("%s/%s", git_dir, path);
 157         if (fromenv)
 158                 *fromenv = 1;
 159         return xstrdup(value);
 160 }
 161
 162 static void setup_git_env(void)
 163 {
 164         struct strbuf sb = STRBUF_INIT;
 165         const char *gitfile;
 166         const char *shallow_file;
 167         const char *replace_ref_base;
 168
 169         git_dir = getenv(GIT_DIR_ENVIRONMENT);
 170         if (!git_dir)
 171                 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
 172         gitfile = read_gitfile(git_dir);
 173         git_dir = xstrdup(gitfile ? gitfile : git_dir);
 174         if (get_common_dir(&sb, git_dir))
 175                 git_common_dir_env = 1;
 176         git_common_dir = strbuf_detach(&sb, NULL);
 177         git_object_dir = git_path_from_env(DB_ENVIRONMENT, git_common_dir,
 178                                            "objects", &git_db_env);
 179         git_index_file = git_path_from_env(INDEX_ENVIRONMENT, git_dir,
 180                                            "index", &git_index_env);
 181         git_graft_file = git_path_from_env(GRAFT_ENVIRONMENT, git_common_dir,
 182                                            "info/grafts", &git_graft_env);
 183         if (getenv(NO_REPLACE_OBJECTS_ENVIRONMENT))
 184                 check_replace_refs = 0;
 185         replace_ref_base = getenv(GIT_REPLACE_REF_BASE_ENVIRONMENT);
 186         git_replace_ref_base = xstrdup(replace_ref_base ? replace_ref_base
 187                                                           : "refs/replace/");
 188         namespace = expand_namespace(getenv(GIT_NAMESPACE_ENVIRONMENT));
 189         namespace_len = strlen(namespace);
 190         shallow_file = getenv(GIT_SHALLOW_FILE_ENVIRONMENT);
 191         if (shallow_file)
 192                 set_alternate_shallow_file(shallow_file, 0);
 193 }
 194
 195 int is_bare_repository(void)
 196 {
 197         /* if core.bare is not 'false', let's see if there is a work tree */
 198         return is_bare_repository_cfg && !get_git_work_tree();
 199 }
 200
 201 const char *get_git_dir(void)
 202 {
 203         if (!git_dir)
 204                 setup_git_env();
 205         return git_dir;
 206 }
 207
 208 const char *get_git_common_dir(void)
 209 {
 210         return git_common_dir;
 211 }
 212
 213 const char *get_git_namespace(void)
 214 {
 215         if (!namespace)
 216                 setup_git_env();
 217         return namespace;
 218 }
 219
 220 const char *strip_namespace(const char *namespaced_ref)
 221 {
 222         if (!starts_with(namespaced_ref, get_git_namespace()))
 223                 return NULL;
 224         return namespaced_ref + namespace_len;
 225 }
 226
 227 static int git_work_tree_initialized;
 228
 229 /*
 230  * Note.  This works only before you used a work tree.  This was added
 231  * primarily to support git-clone to work in a new repository it just
 232  * created, and is not meant to flip between different work trees.
 233  */
 234 void set_git_work_tree(const char *new_work_tree)
 235 {
 236         if (git_work_tree_initialized) {
 237                 new_work_tree = real_path(new_work_tree);
 238                 if (strcmp(new_work_tree, work_tree))
 239                         die("internal error: work tree has already been set\n"
 240                             "Current worktree: %s\nNew worktree: %s",
 241                             work_tree, new_work_tree);
 242                 return;
 243         }
 244         git_work_tree_initialized = 1;
 245         work_tree = xstrdup(real_path(new_work_tree));
 246 }
 247
 248 const char *get_git_work_tree(void)
 249 {
 250         return work_tree;
 251 }
 252
 253 char *get_object_directory(void)
 254 {
 255         if (!git_object_dir)
 256                 setup_git_env();
 257         return git_object_dir;
 258 }
 259
 260 int odb_mkstemp(char *template, size_t limit, const char *pattern)
 261 {
 262         int fd;
 263         /*
 264          * we let the umask do its job, don't try to be more
 265          * restrictive except to remove write permission.
 266          */
 267         int mode = 0444;
 268         snprintf(template, limit, "%s/%s",
 269                  get_object_directory(), pattern);
 270         fd = git_mkstemp_mode(template, mode);
 271         if (0 <= fd)
 272                 return fd;
 273
 274         /* slow path */
 275         /* some mkstemp implementations erase template on failure */
 276         snprintf(template, limit, "%s/%s",
 277                  get_object_directory(), pattern);
 278         safe_create_leading_directories(template);
 279         return xmkstemp_mode(template, mode);
 280 }
 281
 282 int odb_pack_keep(char *name, size_t namesz, const unsigned char *sha1)
 283 {
 284         int fd;
 285
 286         snprintf(name, namesz, "%s/pack/pack-%s.keep",
 287                  get_object_directory(), sha1_to_hex(sha1));
 288         fd = open(name, O_RDWR|O_CREAT|O_EXCL, 0600);
 289         if (0 <= fd)
 290                 return fd;
 291
 292         /* slow path */
 293         safe_create_leading_directories(name);
 294         return open(name, O_RDWR|O_CREAT|O_EXCL, 0600);
 295 }
 296
 297 char *get_index_file(void)
 298 {
 299         if (!git_index_file)
 300                 setup_git_env();
 301         return git_index_file;
 302 }
 303
 304 char *get_graft_file(void)
 305 {
 306         if (!git_graft_file)
 307                 setup_git_env();
 308         return git_graft_file;
 309 }
 310
 311 int set_git_dir(const char *path)
 312 {
 313         if (setenv(GIT_DIR_ENVIRONMENT, path, 1))
 314                 return error("Could not set GIT_DIR to '%s'", path);
 315         setup_git_env();
 316         return 0;
 317 }
 318
 319 const char *get_log_output_encoding(void)
 320 {
 321         return git_log_output_encoding ? git_log_output_encoding
 322                 : get_commit_output_encoding();
 323 }
 324
 325 const char *get_commit_output_encoding(void)
 326 {
 327         return git_commit_encoding ? git_commit_encoding : "UTF-8";
 328 }