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 char git_default_email[MAX_GITNAME];
  15 char git_default_name[MAX_GITNAME];
  16 int user_ident_explicitly_given;
  17 int trust_executable_bit = 1;
  18 int trust_ctime = 1;
  19 int has_symlinks = 1;
  20 int minimum_abbrev = 4, default_abbrev = 7;
  21 int ignore_case;
  22 int assume_unchanged;
  23 int prefer_symlink_refs;
  24 int is_bare_repository_cfg = -1; /* unspecified */
  25 int log_all_ref_updates = -1; /* unspecified */
  26 int warn_ambiguous_refs = 1;
  27 int repository_format_version;
  28 const char *git_commit_encoding;
  29 const char *git_log_output_encoding;
  30 int shared_repository = PERM_UMASK;
  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 = 16 * 1024 * 1024;
  41 unsigned long big_file_threshold = 512 * 1024 * 1024;
  42 const char *log_pack_access;
  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 read_replace_refs = 1; /* NEEDSWORK: rename to use_replace_refs */
  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_MATCHING;
  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 struct startup_info *startup_info;
  65 unsigned long pack_size_limit_cfg;
  66 enum hide_dotfiles_type hide_dotfiles = HIDE_DOTFILES_DOTGITONLY;
  67
  68 /* Parallel index stat data preload? */
  69 int core_preload_index = 0;
  70
  71 /* This is set by setup_git_dir_gently() and/or git_default_config() */
  72 char *git_work_tree_cfg;
  73 static char *work_tree;
  74
  75 static const char *namespace;
  76 static size_t namespace_len;
  77
  78 static const char *git_dir;
  79 static char *git_object_dir, *git_index_file, *git_graft_file;
  80
  81 /*
  82  * Repository-local GIT_* environment variables
  83  * Remember to update local_repo_env_size in cache.h when
  84  * the size of the list changes
  85  */
  86 const char * const local_repo_env[LOCAL_REPO_ENV_SIZE + 1] = {
  87         ALTERNATE_DB_ENVIRONMENT,
  88         CONFIG_ENVIRONMENT,
  89         CONFIG_DATA_ENVIRONMENT,
  90         DB_ENVIRONMENT,
  91         GIT_DIR_ENVIRONMENT,
  92         GIT_WORK_TREE_ENVIRONMENT,
  93         GRAFT_ENVIRONMENT,
  94         INDEX_ENVIRONMENT,
  95         NO_REPLACE_OBJECTS_ENVIRONMENT,
  96         NULL
  97 };
  98
  99 static char *expand_namespace(const char *raw_namespace)
 100 {
 101         struct strbuf buf = STRBUF_INIT;
 102         struct strbuf **components, **c;
 103
 104         if (!raw_namespace || !*raw_namespace)
 105                 return xstrdup("");
 106
 107         strbuf_addstr(&buf, raw_namespace);
 108         components = strbuf_split(&buf, '/');
 109         strbuf_reset(&buf);
 110         for (c = components; *c; c++)
 111                 if (strcmp((*c)->buf, "/") != 0)
 112                         strbuf_addf(&buf, "refs/namespaces/%s", (*c)->buf);
 113         strbuf_list_free(components);
 114         if (check_refname_format(buf.buf, 0))
 115                 die("bad git namespace path \"%s\"", raw_namespace);
 116         strbuf_addch(&buf, '/');
 117         return strbuf_detach(&buf, NULL);
 118 }
 119
 120 static void setup_git_env(void)
 121 {
 122         git_dir = getenv(GIT_DIR_ENVIRONMENT);
 123         git_dir = git_dir ? xstrdup(git_dir) : NULL;
 124         if (!git_dir) {
 125                 git_dir = read_gitfile(DEFAULT_GIT_DIR_ENVIRONMENT);
 126                 git_dir = git_dir ? xstrdup(git_dir) : NULL;
 127         }
 128         if (!git_dir)
 129                 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
 130         git_object_dir = getenv(DB_ENVIRONMENT);
 131         if (!git_object_dir) {
 132                 git_object_dir = xmalloc(strlen(git_dir) + 9);
 133                 sprintf(git_object_dir, "%s/objects", git_dir);
 134         }
 135         git_index_file = getenv(INDEX_ENVIRONMENT);
 136         if (!git_index_file) {
 137                 git_index_file = xmalloc(strlen(git_dir) + 7);
 138                 sprintf(git_index_file, "%s/index", git_dir);
 139         }
 140         git_graft_file = getenv(GRAFT_ENVIRONMENT);
 141         if (!git_graft_file)
 142                 git_graft_file = git_pathdup("info/grafts");
 143         if (getenv(NO_REPLACE_OBJECTS_ENVIRONMENT))
 144                 read_replace_refs = 0;
 145         namespace = expand_namespace(getenv(GIT_NAMESPACE_ENVIRONMENT));
 146         namespace_len = strlen(namespace);
 147 }
 148
 149 int is_bare_repository(void)
 150 {
 151         /* if core.bare is not 'false', let's see if there is a work tree */
 152         return is_bare_repository_cfg && !get_git_work_tree();
 153 }
 154
 155 int have_git_dir(void)
 156 {
 157         return !!git_dir;
 158 }
 159
 160 const char *get_git_dir(void)
 161 {
 162         if (!git_dir)
 163                 setup_git_env();
 164         return git_dir;
 165 }
 166
 167 const char *get_git_namespace(void)
 168 {
 169         if (!namespace)
 170                 setup_git_env();
 171         return namespace;
 172 }
 173
 174 const char *strip_namespace(const char *namespaced_ref)
 175 {
 176         if (prefixcmp(namespaced_ref, get_git_namespace()) != 0)
 177                 return NULL;
 178         return namespaced_ref + namespace_len;
 179 }
 180
 181 static int git_work_tree_initialized;
 182
 183 /*
 184  * Note.  This works only before you used a work tree.  This was added
 185  * primarily to support git-clone to work in a new repository it just
 186  * created, and is not meant to flip between different work trees.
 187  */
 188 void set_git_work_tree(const char *new_work_tree)
 189 {
 190         if (git_work_tree_initialized) {
 191                 new_work_tree = real_path(new_work_tree);
 192                 if (strcmp(new_work_tree, work_tree))
 193                         die("internal error: work tree has already been set\n"
 194                             "Current worktree: %s\nNew worktree: %s",
 195                             work_tree, new_work_tree);
 196                 return;
 197         }
 198         git_work_tree_initialized = 1;
 199         work_tree = xstrdup(real_path(new_work_tree));
 200 }
 201
 202 const char *get_git_work_tree(void)
 203 {
 204         return work_tree;
 205 }
 206
 207 char *get_object_directory(void)
 208 {
 209         if (!git_object_dir)
 210                 setup_git_env();
 211         return git_object_dir;
 212 }
 213
 214 int odb_mkstemp(char *template, size_t limit, const char *pattern)
 215 {
 216         int fd;
 217         /*
 218          * we let the umask do its job, don't try to be more
 219          * restrictive except to remove write permission.
 220          */
 221         int mode = 0444;
 222         snprintf(template, limit, "%s/%s",
 223                  get_object_directory(), pattern);
 224         fd = git_mkstemp_mode(template, mode);
 225         if (0 <= fd)
 226                 return fd;
 227
 228         /* slow path */
 229         /* some mkstemp implementations erase template on failure */
 230         snprintf(template, limit, "%s/%s",
 231                  get_object_directory(), pattern);
 232         safe_create_leading_directories(template);
 233         return xmkstemp_mode(template, mode);
 234 }
 235
 236 int odb_pack_keep(char *name, size_t namesz, unsigned char *sha1)
 237 {
 238         int fd;
 239
 240         snprintf(name, namesz, "%s/pack/pack-%s.keep",
 241                  get_object_directory(), sha1_to_hex(sha1));
 242         fd = open(name, O_RDWR|O_CREAT|O_EXCL, 0600);
 243         if (0 <= fd)
 244                 return fd;
 245
 246         /* slow path */
 247         safe_create_leading_directories(name);
 248         return open(name, O_RDWR|O_CREAT|O_EXCL, 0600);
 249 }
 250
 251 char *get_index_file(void)
 252 {
 253         if (!git_index_file)
 254                 setup_git_env();
 255         return git_index_file;
 256 }
 257
 258 char *get_graft_file(void)
 259 {
 260         if (!git_graft_file)
 261                 setup_git_env();
 262         return git_graft_file;
 263 }
 264
 265 int set_git_dir(const char *path)
 266 {
 267         if (setenv(GIT_DIR_ENVIRONMENT, path, 1))
 268                 return error("Could not set GIT_DIR to '%s'", path);
 269         setup_git_env();
 270         return 0;
 271 }
 272
 273 const char *get_log_output_encoding(void)
 274 {
 275         return git_log_output_encoding ? git_log_output_encoding
 276                 : get_commit_output_encoding();
 277 }
 278
 279 const char *get_commit_output_encoding(void)
 280 {
 281         return git_commit_encoding ? git_commit_encoding : "UTF-8";
 282 }