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