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