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