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 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 = 96 * 1024 * 1024;
  41 unsigned long big_file_threshold = 512 * 1024 * 1024;
  42 const char *pager_program;
  43 int pager_use_color = 1;
  44 const char *editor_program;
  45 const char *askpass_program;
  46 const char *excludes_file;
  47 enum auto_crlf auto_crlf = AUTO_CRLF_FALSE;
  48 int check_replace_refs = 1;
  49 enum eol core_eol = EOL_UNSET;
  50 enum safe_crlf safe_crlf = SAFE_CRLF_WARN;
  51 unsigned whitespace_rule_cfg = WS_DEFAULT_RULE;
  52 enum branch_track git_branch_track = BRANCH_TRACK_REMOTE;
  53 enum rebase_setup_type autorebase = AUTOREBASE_NEVER;
  54 enum push_default_type push_default = PUSH_DEFAULT_UNSPECIFIED;
  55 #ifndef OBJECT_CREATION_MODE
  56 #define OBJECT_CREATION_MODE OBJECT_CREATION_USES_HARDLINKS
  57 #endif
  58 enum object_creation_mode object_creation_mode = OBJECT_CREATION_MODE;
  59 char *notes_ref_name;
  60 int grafts_replace_parents = 1;
  61 int core_apply_sparse_checkout;
  62 int merge_log_config = -1;
  63 int precomposed_unicode = -1; /* see probe_utf8_pathname_composition() */
  64 struct startup_info *startup_info;
  65 unsigned long pack_size_limit_cfg;
  66
  67 /*
  68  * The character that begins a commented line in user-editable file
  69  * that is subject to stripspace.
  70  */
  71 char comment_line_char = '#';
  72 int auto_comment_line_char;
  73
  74 /* Parallel index stat data preload? */
  75 int core_preload_index = 1;
  76
  77 /* This is set by setup_git_dir_gently() and/or git_default_config() */
  78 char *git_work_tree_cfg;
  79 static char *work_tree;
  80
  81 static const char *namespace;
  82 static size_t namespace_len;
  83
  84 static const char *git_dir, *git_common_dir;
  85 static char *git_object_dir, *git_index_file, *git_graft_file;
  86 int git_db_env, git_index_env, git_graft_env, git_common_dir_env;
  87
  88 /*
  89  * Repository-local GIT_* environment variables; see cache.h for details.
  90  */
  91 const char * const local_repo_env[] = {
  92         ALTERNATE_DB_ENVIRONMENT,
  93         CONFIG_ENVIRONMENT,
  94         CONFIG_DATA_ENVIRONMENT,
  95         DB_ENVIRONMENT,
  96         GIT_DIR_ENVIRONMENT,
  97         GIT_WORK_TREE_ENVIRONMENT,
  98         GIT_IMPLICIT_WORK_TREE_ENVIRONMENT,
  99         GRAFT_ENVIRONMENT,
 100         INDEX_ENVIRONMENT,
 101         NO_REPLACE_OBJECTS_ENVIRONMENT,
 102         GIT_PREFIX_ENVIRONMENT,
 103         GIT_SHALLOW_FILE_ENVIRONMENT,
 104         GIT_COMMON_DIR_ENVIRONMENT,
 105         NULL
 106 };
 107
 108 static char *expand_namespace(const char *raw_namespace)
 109 {
 110         struct strbuf buf = STRBUF_INIT;
 111         struct strbuf **components, **c;
 112
 113         if (!raw_namespace || !*raw_namespace)
 114                 return xstrdup("");
 115
 116         strbuf_addstr(&buf, raw_namespace);
 117         components = strbuf_split(&buf, '/');
 118         strbuf_reset(&buf);
 119         for (c = components; *c; c++)
 120                 if (strcmp((*c)->buf, "/") != 0)
 121                         strbuf_addf(&buf, "refs/namespaces/%s", (*c)->buf);
 122         strbuf_list_free(components);
 123         if (check_refname_format(buf.buf, 0))
 124                 die("bad git namespace path \"%s\"", raw_namespace);
 125         strbuf_addch(&buf, '/');
 126         return strbuf_detach(&buf, NULL);
 127 }
 128
 129 static char *git_path_from_env(const char *envvar, const char *git_dir,
 130                                const char *path, int *fromenv)
 131 {
 132         const char *value = getenv(envvar);
 133         if (!value) {
 134                 char *buf = xmalloc(strlen(git_dir) + strlen(path) + 2);
 135                 sprintf(buf, "%s/%s", git_dir, path);
 136                 return buf;
 137         }
 138         if (fromenv)
 139                 *fromenv = 1;
 140         return xstrdup(value);
 141 }
 142
 143 static void setup_git_env(void)
 144 {
 145         struct strbuf sb = STRBUF_INIT;
 146         const char *gitfile;
 147         const char *shallow_file;
 148
 149         git_dir = getenv(GIT_DIR_ENVIRONMENT);
 150         if (!git_dir)
 151                 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
 152         gitfile = read_gitfile(git_dir);
 153         git_dir = xstrdup(gitfile ? gitfile : git_dir);
 154         if (get_common_dir(&sb, git_dir))
 155                 git_common_dir_env = 1;
 156         git_common_dir = strbuf_detach(&sb, NULL);
 157         git_object_dir = git_path_from_env(DB_ENVIRONMENT, git_common_dir,
 158                                            "objects", &git_db_env);
 159         git_index_file = git_path_from_env(INDEX_ENVIRONMENT, git_dir,
 160                                            "index", &git_index_env);
 161         git_graft_file = git_path_from_env(GRAFT_ENVIRONMENT, git_common_dir,
 162                                            "info/grafts", &git_graft_env);
 163         if (getenv(NO_REPLACE_OBJECTS_ENVIRONMENT))
 164                 check_replace_refs = 0;
 165         namespace = expand_namespace(getenv(GIT_NAMESPACE_ENVIRONMENT));
 166         namespace_len = strlen(namespace);
 167         shallow_file = getenv(GIT_SHALLOW_FILE_ENVIRONMENT);
 168         if (shallow_file)
 169                 set_alternate_shallow_file(shallow_file, 0);
 170 }
 171
 172 int is_bare_repository(void)
 173 {
 174         /* if core.bare is not 'false', let's see if there is a work tree */
 175         return is_bare_repository_cfg && !get_git_work_tree();
 176 }
 177
 178 const char *get_git_dir(void)
 179 {
 180         if (!git_dir)
 181                 setup_git_env();
 182         return git_dir;
 183 }
 184
 185 const char *get_git_common_dir(void)
 186 {
 187         return git_common_dir;
 188 }
 189
 190 const char *get_git_namespace(void)
 191 {
 192         if (!namespace)
 193                 setup_git_env();
 194         return namespace;
 195 }
 196
 197 const char *strip_namespace(const char *namespaced_ref)
 198 {
 199         if (!starts_with(namespaced_ref, get_git_namespace()))
 200                 return NULL;
 201         return namespaced_ref + namespace_len;
 202 }
 203
 204 static int git_work_tree_initialized;
 205
 206 /*
 207  * Note.  This works only before you used a work tree.  This was added
 208  * primarily to support git-clone to work in a new repository it just
 209  * created, and is not meant to flip between different work trees.
 210  */
 211 void set_git_work_tree(const char *new_work_tree)
 212 {
 213         if (git_work_tree_initialized) {
 214                 new_work_tree = real_path(new_work_tree);
 215                 if (strcmp(new_work_tree, work_tree))
 216                         die("internal error: work tree has already been set\n"
 217                             "Current worktree: %s\nNew worktree: %s",
 218                             work_tree, new_work_tree);
 219                 return;
 220         }
 221         git_work_tree_initialized = 1;
 222         work_tree = xstrdup(real_path(new_work_tree));
 223 }
 224
 225 const char *get_git_work_tree(void)
 226 {
 227         return work_tree;
 228 }
 229
 230 char *get_object_directory(void)
 231 {
 232         if (!git_object_dir)
 233                 setup_git_env();
 234         return git_object_dir;
 235 }
 236
 237 int odb_mkstemp(char *template, size_t limit, const char *pattern)
 238 {
 239         int fd;
 240         /*
 241          * we let the umask do its job, don't try to be more
 242          * restrictive except to remove write permission.
 243          */
 244         int mode = 0444;
 245         snprintf(template, limit, "%s/%s",
 246                  get_object_directory(), pattern);
 247         fd = git_mkstemp_mode(template, mode);
 248         if (0 <= fd)
 249                 return fd;
 250
 251         /* slow path */
 252         /* some mkstemp implementations erase template on failure */
 253         snprintf(template, limit, "%s/%s",
 254                  get_object_directory(), pattern);
 255         safe_create_leading_directories(template);
 256         return xmkstemp_mode(template, mode);
 257 }
 258
 259 int odb_pack_keep(char *name, size_t namesz, const unsigned char *sha1)
 260 {
 261         int fd;
 262
 263         snprintf(name, namesz, "%s/pack/pack-%s.keep",
 264                  get_object_directory(), sha1_to_hex(sha1));
 265         fd = open(name, O_RDWR|O_CREAT|O_EXCL, 0600);
 266         if (0 <= fd)
 267                 return fd;
 268
 269         /* slow path */
 270         safe_create_leading_directories(name);
 271         return open(name, O_RDWR|O_CREAT|O_EXCL, 0600);
 272 }
 273
 274 char *get_index_file(void)
 275 {
 276         if (!git_index_file)
 277                 setup_git_env();
 278         return git_index_file;
 279 }
 280
 281 char *get_graft_file(void)
 282 {
 283         if (!git_graft_file)
 284                 setup_git_env();
 285         return git_graft_file;
 286 }
 287
 288 int set_git_dir(const char *path)
 289 {
 290         if (setenv(GIT_DIR_ENVIRONMENT, path, 1))
 291                 return error("Could not set GIT_DIR to '%s'", path);
 292         setup_git_env();
 293         return 0;
 294 }
 295
 296 const char *get_log_output_encoding(void)
 297 {
 298         return git_log_output_encoding ? git_log_output_encoding
 299                 : get_commit_output_encoding();
 300 }
 301
 302 const char *get_commit_output_encoding(void)
 303 {
 304         return git_commit_encoding ? git_commit_encoding : "UTF-8";
 305 }