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 int repository_format_precious_objects;
  30 const char *git_commit_encoding;
  31 const char *git_log_output_encoding;
  32 int shared_repository = PERM_UMASK;
  33 const char *apply_default_whitespace;
  34 const char *apply_default_ignorewhitespace;
  35 const char *git_attributes_file;
  36 int zlib_compression_level = Z_BEST_SPEED;
  37 int core_compression_level;
  38 int core_compression_seen;
  39 int fsync_object_files;
  40 size_t packed_git_window_size = DEFAULT_PACKED_GIT_WINDOW_SIZE;
  41 size_t packed_git_limit = DEFAULT_PACKED_GIT_LIMIT;
  42 size_t delta_base_cache_limit = 96 * 1024 * 1024;
  43 unsigned long big_file_threshold = 512 * 1024 * 1024;
  44 const char *pager_program;
  45 int pager_use_color = 1;
  46 const char *editor_program;
  47 const char *askpass_program;
  48 const char *excludes_file;
  49 enum auto_crlf auto_crlf = AUTO_CRLF_FALSE;
  50 int check_replace_refs = 1;
  51 char *git_replace_ref_base;
  52 enum eol core_eol = EOL_UNSET;
  53 enum safe_crlf safe_crlf = SAFE_CRLF_WARN;
  54 unsigned whitespace_rule_cfg = WS_DEFAULT_RULE;
  55 enum branch_track git_branch_track = BRANCH_TRACK_REMOTE;
  56 enum rebase_setup_type autorebase = AUTOREBASE_NEVER;
  57 enum push_default_type push_default = PUSH_DEFAULT_UNSPECIFIED;
  58 #ifndef OBJECT_CREATION_MODE
  59 #define OBJECT_CREATION_MODE OBJECT_CREATION_USES_HARDLINKS
  60 #endif
  61 enum object_creation_mode object_creation_mode = OBJECT_CREATION_MODE;
  62 char *notes_ref_name;
  63 int grafts_replace_parents = 1;
  64 int core_apply_sparse_checkout;
  65 int merge_log_config = -1;
  66 int precomposed_unicode = -1; /* see probe_utf8_pathname_composition() */
  67 struct startup_info *startup_info;
  68 unsigned long pack_size_limit_cfg;
  69
  70 #ifndef PROTECT_HFS_DEFAULT
  71 #define PROTECT_HFS_DEFAULT 0
  72 #endif
  73 int protect_hfs = PROTECT_HFS_DEFAULT;
  74
  75 #ifndef PROTECT_NTFS_DEFAULT
  76 #define PROTECT_NTFS_DEFAULT 0
  77 #endif
  78 int protect_ntfs = PROTECT_NTFS_DEFAULT;
  79
  80 /*
  81  * The character that begins a commented line in user-editable file
  82  * that is subject to stripspace.
  83  */
  84 char comment_line_char = '#';
  85 int auto_comment_line_char;
  86
  87 /* Parallel index stat data preload? */
  88 int core_preload_index = 1;
  89
  90 /* This is set by setup_git_dir_gently() and/or git_default_config() */
  91 char *git_work_tree_cfg;
  92 static char *work_tree;
  93
  94 static const char *namespace;
  95 static size_t namespace_len;
  96
  97 static const char *git_dir, *git_common_dir;
  98 static char *git_object_dir, *git_index_file, *git_graft_file;
  99 int git_db_env, git_index_env, git_graft_env, git_common_dir_env;
 100
 101 /*
 102  * Repository-local GIT_* environment variables; see cache.h for details.
 103  */
 104 const char * const local_repo_env[] = {
 105         ALTERNATE_DB_ENVIRONMENT,
 106         CONFIG_ENVIRONMENT,
 107         CONFIG_DATA_ENVIRONMENT,
 108         DB_ENVIRONMENT,
 109         GIT_DIR_ENVIRONMENT,
 110         GIT_WORK_TREE_ENVIRONMENT,
 111         GIT_IMPLICIT_WORK_TREE_ENVIRONMENT,
 112         GRAFT_ENVIRONMENT,
 113         INDEX_ENVIRONMENT,
 114         NO_REPLACE_OBJECTS_ENVIRONMENT,
 115         GIT_REPLACE_REF_BASE_ENVIRONMENT,
 116         GIT_PREFIX_ENVIRONMENT,
 117         GIT_SHALLOW_FILE_ENVIRONMENT,
 118         GIT_COMMON_DIR_ENVIRONMENT,
 119         NULL
 120 };
 121
 122 static char *expand_namespace(const char *raw_namespace)
 123 {
 124         struct strbuf buf = STRBUF_INIT;
 125         struct strbuf **components, **c;
 126
 127         if (!raw_namespace || !*raw_namespace)
 128                 return xstrdup("");
 129
 130         strbuf_addstr(&buf, raw_namespace);
 131         components = strbuf_split(&buf, '/');
 132         strbuf_reset(&buf);
 133         for (c = components; *c; c++)
 134                 if (strcmp((*c)->buf, "/") != 0)
 135                         strbuf_addf(&buf, "refs/namespaces/%s", (*c)->buf);
 136         strbuf_list_free(components);
 137         if (check_refname_format(buf.buf, 0))
 138                 die("bad git namespace path \"%s\"", raw_namespace);
 139         strbuf_addch(&buf, '/');
 140         return strbuf_detach(&buf, NULL);
 141 }
 142
 143 static char *git_path_from_env(const char *envvar, const char *git_dir,
 144                                const char *path, int *fromenv)
 145 {
 146         const char *value = getenv(envvar);
 147         if (!value)
 148                 return xstrfmt("%s/%s", git_dir, path);
 149         if (fromenv)
 150                 *fromenv = 1;
 151         return xstrdup(value);
 152 }
 153
 154 static void setup_git_env(void)
 155 {
 156         struct strbuf sb = STRBUF_INIT;
 157         const char *gitfile;
 158         const char *shallow_file;
 159         const char *replace_ref_base;
 160
 161         git_dir = getenv(GIT_DIR_ENVIRONMENT);
 162         if (!git_dir)
 163                 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
 164         gitfile = read_gitfile(git_dir);
 165         git_dir = xstrdup(gitfile ? gitfile : git_dir);
 166         if (get_common_dir(&sb, git_dir))
 167                 git_common_dir_env = 1;
 168         git_common_dir = strbuf_detach(&sb, NULL);
 169         git_object_dir = git_path_from_env(DB_ENVIRONMENT, git_common_dir,
 170                                            "objects", &git_db_env);
 171         git_index_file = git_path_from_env(INDEX_ENVIRONMENT, git_dir,
 172                                            "index", &git_index_env);
 173         git_graft_file = git_path_from_env(GRAFT_ENVIRONMENT, git_common_dir,
 174                                            "info/grafts", &git_graft_env);
 175         if (getenv(NO_REPLACE_OBJECTS_ENVIRONMENT))
 176                 check_replace_refs = 0;
 177         replace_ref_base = getenv(GIT_REPLACE_REF_BASE_ENVIRONMENT);
 178         git_replace_ref_base = xstrdup(replace_ref_base ? replace_ref_base
 179                                                           : "refs/replace/");
 180         namespace = expand_namespace(getenv(GIT_NAMESPACE_ENVIRONMENT));
 181         namespace_len = strlen(namespace);
 182         shallow_file = getenv(GIT_SHALLOW_FILE_ENVIRONMENT);
 183         if (shallow_file)
 184                 set_alternate_shallow_file(shallow_file, 0);
 185 }
 186
 187 int is_bare_repository(void)
 188 {
 189         /* if core.bare is not 'false', let's see if there is a work tree */
 190         return is_bare_repository_cfg && !get_git_work_tree();
 191 }
 192
 193 const char *get_git_dir(void)
 194 {
 195         if (!git_dir)
 196                 setup_git_env();
 197         return git_dir;
 198 }
 199
 200 const char *get_git_common_dir(void)
 201 {
 202         return git_common_dir;
 203 }
 204
 205 const char *get_git_namespace(void)
 206 {
 207         if (!namespace)
 208                 setup_git_env();
 209         return namespace;
 210 }
 211
 212 const char *strip_namespace(const char *namespaced_ref)
 213 {
 214         if (!starts_with(namespaced_ref, get_git_namespace()))
 215                 return NULL;
 216         return namespaced_ref + namespace_len;
 217 }
 218
 219 static int git_work_tree_initialized;
 220
 221 /*
 222  * Note.  This works only before you used a work tree.  This was added
 223  * primarily to support git-clone to work in a new repository it just
 224  * created, and is not meant to flip between different work trees.
 225  */
 226 void set_git_work_tree(const char *new_work_tree)
 227 {
 228         if (git_work_tree_initialized) {
 229                 new_work_tree = real_path(new_work_tree);
 230                 if (strcmp(new_work_tree, work_tree))
 231                         die("internal error: work tree has already been set\n"
 232                             "Current worktree: %s\nNew worktree: %s",
 233                             work_tree, new_work_tree);
 234                 return;
 235         }
 236         git_work_tree_initialized = 1;
 237         work_tree = xstrdup(real_path(new_work_tree));
 238         if (setenv(GIT_WORK_TREE_ENVIRONMENT, work_tree, 1))
 239                 die("could not set GIT_WORK_TREE to '%s'", work_tree);
 240 }
 241
 242 const char *get_git_work_tree(void)
 243 {
 244         return work_tree;
 245 }
 246
 247 char *get_object_directory(void)
 248 {
 249         if (!git_object_dir)
 250                 setup_git_env();
 251         return git_object_dir;
 252 }
 253
 254 int odb_mkstemp(char *template, size_t limit, const char *pattern)
 255 {
 256         int fd;
 257         /*
 258          * we let the umask do its job, don't try to be more
 259          * restrictive except to remove write permission.
 260          */
 261         int mode = 0444;
 262         snprintf(template, limit, "%s/%s",
 263                  get_object_directory(), pattern);
 264         fd = git_mkstemp_mode(template, mode);
 265         if (0 <= fd)
 266                 return fd;
 267
 268         /* slow path */
 269         /* some mkstemp implementations erase template on failure */
 270         snprintf(template, limit, "%s/%s",
 271                  get_object_directory(), pattern);
 272         safe_create_leading_directories(template);
 273         return xmkstemp_mode(template, mode);
 274 }
 275
 276 int odb_pack_keep(char *name, size_t namesz, const unsigned char *sha1)
 277 {
 278         int fd;
 279
 280         snprintf(name, namesz, "%s/pack/pack-%s.keep",
 281                  get_object_directory(), sha1_to_hex(sha1));
 282         fd = open(name, O_RDWR|O_CREAT|O_EXCL, 0600);
 283         if (0 <= fd)
 284                 return fd;
 285
 286         /* slow path */
 287         safe_create_leading_directories(name);
 288         return open(name, O_RDWR|O_CREAT|O_EXCL, 0600);
 289 }
 290
 291 char *get_index_file(void)
 292 {
 293         if (!git_index_file)
 294                 setup_git_env();
 295         return git_index_file;
 296 }
 297
 298 char *get_graft_file(void)
 299 {
 300         if (!git_graft_file)
 301                 setup_git_env();
 302         return git_graft_file;
 303 }
 304
 305 int set_git_dir(const char *path)
 306 {
 307         if (setenv(GIT_DIR_ENVIRONMENT, path, 1))
 308                 return error("Could not set GIT_DIR to '%s'", path);
 309         setup_git_env();
 310         return 0;
 311 }
 312
 313 const char *get_log_output_encoding(void)
 314 {
 315         return git_log_output_encoding ? git_log_output_encoding
 316                 : get_commit_output_encoding();
 317 }
 318
 319 const char *get_commit_output_encoding(void)
 320 {
 321         return git_commit_encoding ? git_commit_encoding : "UTF-8";
 322 }