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
  14 int trust_executable_bit = 1;
  15 int trust_ctime = 1;
  16 int has_symlinks = 1;
  17 int minimum_abbrev = 4, default_abbrev = 7;
  18 int ignore_case;
  19 int assume_unchanged;
  20 int prefer_symlink_refs;
  21 int is_bare_repository_cfg = -1; /* unspecified */
  22 int log_all_ref_updates = -1; /* unspecified */
  23 int warn_ambiguous_refs = 1;
  24 int repository_format_version;
  25 const char *git_commit_encoding;
  26 const char *git_log_output_encoding;
  27 int shared_repository = PERM_UMASK;
  28 const char *apply_default_whitespace;
  29 const char *apply_default_ignorewhitespace;
  30 const char *git_attributes_file;
  31 int zlib_compression_level = Z_BEST_SPEED;
  32 int core_compression_level;
  33 int core_compression_seen;
  34 int fsync_object_files;
  35 size_t packed_git_window_size = DEFAULT_PACKED_GIT_WINDOW_SIZE;
  36 size_t packed_git_limit = DEFAULT_PACKED_GIT_LIMIT;
  37 size_t delta_base_cache_limit = 16 * 1024 * 1024;
  38 unsigned long big_file_threshold = 512 * 1024 * 1024;
  39 const char *log_pack_access;
  40 const char *pager_program;
  41 int pager_use_color = 1;
  42 const char *editor_program;
  43 const char *askpass_program;
  44 const char *excludes_file;
  45 enum auto_crlf auto_crlf = AUTO_CRLF_FALSE;
  46 int read_replace_refs = 1; /* NEEDSWORK: rename to use_replace_refs */
  47 enum eol core_eol = EOL_UNSET;
  48 enum safe_crlf safe_crlf = SAFE_CRLF_WARN;
  49 unsigned whitespace_rule_cfg = WS_DEFAULT_RULE;
  50 enum branch_track git_branch_track = BRANCH_TRACK_REMOTE;
  51 enum rebase_setup_type autorebase = AUTOREBASE_NEVER;
  52 enum push_default_type push_default = PUSH_DEFAULT_UNSPECIFIED;
  53 #ifndef OBJECT_CREATION_MODE
  54 #define OBJECT_CREATION_MODE OBJECT_CREATION_USES_HARDLINKS
  55 #endif
  56 enum object_creation_mode object_creation_mode = OBJECT_CREATION_MODE;
  57 char *notes_ref_name;
  58 int grafts_replace_parents = 1;
  59 int core_apply_sparse_checkout;
  60 int merge_log_config = -1;
  61 int precomposed_unicode = -1; /* see probe_utf8_pathname_composition() */
  62 struct startup_info *startup_info;
  63 unsigned long pack_size_limit_cfg;
  64
  65 /* Parallel index stat data preload? */
  66 int core_preload_index = 0;
  67
  68 /* This is set by setup_git_dir_gently() and/or git_default_config() */
  69 char *git_work_tree_cfg;
  70 static char *work_tree;
  71
  72 static const char *namespace;
  73 static size_t namespace_len;
  74
  75 static const char *git_dir;
  76 static char *git_object_dir, *git_index_file, *git_graft_file;
  77
  78 /*
  79  * Repository-local GIT_* environment variables
  80  * Remember to update local_repo_env_size in cache.h when
  81  * the size of the list changes
  82  */
  83 const char * const local_repo_env[LOCAL_REPO_ENV_SIZE + 1] = {
  84         ALTERNATE_DB_ENVIRONMENT,
  85         CONFIG_ENVIRONMENT,
  86         CONFIG_DATA_ENVIRONMENT,
  87         DB_ENVIRONMENT,
  88         GIT_DIR_ENVIRONMENT,
  89         GIT_WORK_TREE_ENVIRONMENT,
  90         GRAFT_ENVIRONMENT,
  91         INDEX_ENVIRONMENT,
  92         NO_REPLACE_OBJECTS_ENVIRONMENT,
  93         NULL
  94 };
  95
  96 static char *expand_namespace(const char *raw_namespace)
  97 {
  98         struct strbuf buf = STRBUF_INIT;
  99         struct strbuf **components, **c;
 100
 101         if (!raw_namespace || !*raw_namespace)
 102                 return xstrdup("");
 103
 104         strbuf_addstr(&buf, raw_namespace);
 105         components = strbuf_split(&buf, '/');
 106         strbuf_reset(&buf);
 107         for (c = components; *c; c++)
 108                 if (strcmp((*c)->buf, "/") != 0)
 109                         strbuf_addf(&buf, "refs/namespaces/%s", (*c)->buf);
 110         strbuf_list_free(components);
 111         if (check_refname_format(buf.buf, 0))
 112                 die("bad git namespace path \"%s\"", raw_namespace);
 113         strbuf_addch(&buf, '/');
 114         return strbuf_detach(&buf, NULL);
 115 }
 116
 117 static void setup_git_env(void)
 118 {
 119         git_dir = getenv(GIT_DIR_ENVIRONMENT);
 120         git_dir = git_dir ? xstrdup(git_dir) : NULL;
 121         if (!git_dir) {
 122                 git_dir = read_gitfile(DEFAULT_GIT_DIR_ENVIRONMENT);
 123                 git_dir = git_dir ? xstrdup(git_dir) : NULL;
 124         }
 125         if (!git_dir)
 126                 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
 127         git_object_dir = getenv(DB_ENVIRONMENT);
 128         if (!git_object_dir) {
 129                 git_object_dir = xmalloc(strlen(git_dir) + 9);
 130                 sprintf(git_object_dir, "%s/objects", git_dir);
 131         }
 132         git_index_file = getenv(INDEX_ENVIRONMENT);
 133         if (!git_index_file) {
 134                 git_index_file = xmalloc(strlen(git_dir) + 7);
 135                 sprintf(git_index_file, "%s/index", git_dir);
 136         }
 137         git_graft_file = getenv(GRAFT_ENVIRONMENT);
 138         if (!git_graft_file)
 139                 git_graft_file = git_pathdup("info/grafts");
 140         if (getenv(NO_REPLACE_OBJECTS_ENVIRONMENT))
 141                 read_replace_refs = 0;
 142         namespace = expand_namespace(getenv(GIT_NAMESPACE_ENVIRONMENT));
 143         namespace_len = strlen(namespace);
 144 }
 145
 146 int is_bare_repository(void)
 147 {
 148         /* if core.bare is not 'false', let's see if there is a work tree */
 149         return is_bare_repository_cfg && !get_git_work_tree();
 150 }
 151
 152 int have_git_dir(void)
 153 {
 154         return !!git_dir;
 155 }
 156
 157 const char *get_git_dir(void)
 158 {
 159         if (!git_dir)
 160                 setup_git_env();
 161         return git_dir;
 162 }
 163
 164 const char *get_git_namespace(void)
 165 {
 166         if (!namespace)
 167                 setup_git_env();
 168         return namespace;
 169 }
 170
 171 const char *strip_namespace(const char *namespaced_ref)
 172 {
 173         if (prefixcmp(namespaced_ref, get_git_namespace()) != 0)
 174                 return NULL;
 175         return namespaced_ref + namespace_len;
 176 }
 177
 178 static int git_work_tree_initialized;
 179
 180 /*
 181  * Note.  This works only before you used a work tree.  This was added
 182  * primarily to support git-clone to work in a new repository it just
 183  * created, and is not meant to flip between different work trees.
 184  */
 185 void set_git_work_tree(const char *new_work_tree)
 186 {
 187         if (git_work_tree_initialized) {
 188                 new_work_tree = real_path(new_work_tree);
 189                 if (strcmp(new_work_tree, work_tree))
 190                         die("internal error: work tree has already been set\n"
 191                             "Current worktree: %s\nNew worktree: %s",
 192                             work_tree, new_work_tree);
 193                 return;
 194         }
 195         git_work_tree_initialized = 1;
 196         work_tree = xstrdup(real_path(new_work_tree));
 197 }
 198
 199 const char *get_git_work_tree(void)
 200 {
 201         return work_tree;
 202 }
 203
 204 char *get_object_directory(void)
 205 {
 206         if (!git_object_dir)
 207                 setup_git_env();
 208         return git_object_dir;
 209 }
 210
 211 int odb_mkstemp(char *template, size_t limit, const char *pattern)
 212 {
 213         int fd;
 214         /*
 215          * we let the umask do its job, don't try to be more
 216          * restrictive except to remove write permission.
 217          */
 218         int mode = 0444;
 219         snprintf(template, limit, "%s/%s",
 220                  get_object_directory(), pattern);
 221         fd = git_mkstemp_mode(template, mode);
 222         if (0 <= fd)
 223                 return fd;
 224
 225         /* slow path */
 226         /* some mkstemp implementations erase template on failure */
 227         snprintf(template, limit, "%s/%s",
 228                  get_object_directory(), pattern);
 229         safe_create_leading_directories(template);
 230         return xmkstemp_mode(template, mode);
 231 }
 232
 233 int odb_pack_keep(char *name, size_t namesz, unsigned char *sha1)
 234 {
 235         int fd;
 236
 237         snprintf(name, namesz, "%s/pack/pack-%s.keep",
 238                  get_object_directory(), sha1_to_hex(sha1));
 239         fd = open(name, O_RDWR|O_CREAT|O_EXCL, 0600);
 240         if (0 <= fd)
 241                 return fd;
 242
 243         /* slow path */
 244         safe_create_leading_directories(name);
 245         return open(name, O_RDWR|O_CREAT|O_EXCL, 0600);
 246 }
 247
 248 char *get_index_file(void)
 249 {
 250         if (!git_index_file)
 251                 setup_git_env();
 252         return git_index_file;
 253 }
 254
 255 char *get_graft_file(void)
 256 {
 257         if (!git_graft_file)
 258                 setup_git_env();
 259         return git_graft_file;
 260 }
 261
 262 int set_git_dir(const char *path)
 263 {
 264         if (setenv(GIT_DIR_ENVIRONMENT, path, 1))
 265                 return error("Could not set GIT_DIR to '%s'", path);
 266         setup_git_env();
 267         return 0;
 268 }
 269
 270 const char *get_log_output_encoding(void)
 271 {
 272         return git_log_output_encoding ? git_log_output_encoding
 273                 : get_commit_output_encoding();
 274 }
 275
 276 const char *get_commit_output_encoding(void)
 277 {
 278         return git_commit_encoding ? git_commit_encoding : "UTF-8";
 279 }