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 int trust_executable_bit = 1;
  15 int trust_ctime = 1;
  16 int has_symlinks = 1;
  17 int minimum_abbrev = 4, default_abbrev = 7;
  18 int ignore_case;
  19 int assume_unchanged;
  20 int prefer_symlink_refs;
  21 int is_bare_repository_cfg = -1; /* unspecified */
  22 int log_all_ref_updates = -1; /* unspecified */
  23 int warn_ambiguous_refs = 1;
  24 int repository_format_version;
  25 const char *git_commit_encoding;
  26 const char *git_log_output_encoding;
  27 int shared_repository = PERM_UMASK;
  28 const char *apply_default_whitespace;
  29 const char *apply_default_ignorewhitespace;
  30 const char *git_attributes_file;
  31 int zlib_compression_level = Z_BEST_SPEED;
  32 int core_compression_level;
  33 int core_compression_seen;
  34 int fsync_object_files;
  35 size_t packed_git_window_size = DEFAULT_PACKED_GIT_WINDOW_SIZE;
  36 size_t packed_git_limit = DEFAULT_PACKED_GIT_LIMIT;
  37 size_t delta_base_cache_limit = 16 * 1024 * 1024;
  38 unsigned long big_file_threshold = 512 * 1024 * 1024;
  39 const char *log_pack_access;
  40 const char *pager_program;
  41 int pager_use_color = 1;
  42 const char *editor_program;
  43 const char *askpass_program;
  44 const char *excludes_file;
  45 enum auto_crlf auto_crlf = AUTO_CRLF_FALSE;
  46 int read_replace_refs = 1; /* NEEDSWORK: rename to use_replace_refs */
  47 enum eol core_eol = EOL_UNSET;
  48 enum safe_crlf safe_crlf = SAFE_CRLF_WARN;
  49 unsigned whitespace_rule_cfg = WS_DEFAULT_RULE;
  50 enum branch_track git_branch_track = BRANCH_TRACK_REMOTE;
  51 enum rebase_setup_type autorebase = AUTOREBASE_NEVER;
  52 enum push_default_type push_default = PUSH_DEFAULT_UNSPECIFIED;
  53 #ifndef OBJECT_CREATION_MODE
  54 #define OBJECT_CREATION_MODE OBJECT_CREATION_USES_HARDLINKS
  55 #endif
  56 enum object_creation_mode object_creation_mode = OBJECT_CREATION_MODE;
  57 char *notes_ref_name;
  58 int grafts_replace_parents = 1;
  59 int core_apply_sparse_checkout;
  60 int merge_log_config = -1;
  61 struct startup_info *startup_info;
  62 unsigned long pack_size_limit_cfg;
  63
  64 /* Parallel index stat data preload? */
  65 int core_preload_index = 0;
  66
  67 /* This is set by setup_git_dir_gently() and/or git_default_config() */
  68 char *git_work_tree_cfg;
  69 static char *work_tree;
  70
  71 static const char *namespace;
  72 static size_t namespace_len;
  73
  74 static const char *git_dir;
  75 static char *git_object_dir, *git_index_file, *git_graft_file;
  76
  77 /*
  78  * Repository-local GIT_* environment variables
  79  * Remember to update local_repo_env_size in cache.h when
  80  * the size of the list changes
  81  */
  82 const char * const local_repo_env[LOCAL_REPO_ENV_SIZE + 1] = {
  83         ALTERNATE_DB_ENVIRONMENT,
  84         CONFIG_ENVIRONMENT,
  85         CONFIG_DATA_ENVIRONMENT,
  86         DB_ENVIRONMENT,
  87         GIT_DIR_ENVIRONMENT,
  88         GIT_WORK_TREE_ENVIRONMENT,
  89         GRAFT_ENVIRONMENT,
  90         INDEX_ENVIRONMENT,
  91         NO_REPLACE_OBJECTS_ENVIRONMENT,
  92         NULL
  93 };
  94
  95 static char *expand_namespace(const char *raw_namespace)
  96 {
  97         struct strbuf buf = STRBUF_INIT;
  98         struct strbuf **components, **c;
  99
 100         if (!raw_namespace || !*raw_namespace)
 101                 return xstrdup("");
 102
 103         strbuf_addstr(&buf, raw_namespace);
 104         components = strbuf_split(&buf, '/');
 105         strbuf_reset(&buf);
 106         for (c = components; *c; c++)
 107                 if (strcmp((*c)->buf, "/") != 0)
 108                         strbuf_addf(&buf, "refs/namespaces/%s", (*c)->buf);
 109         strbuf_list_free(components);
 110         if (check_refname_format(buf.buf, 0))
 111                 die("bad git namespace path \"%s\"", raw_namespace);
 112         strbuf_addch(&buf, '/');
 113         return strbuf_detach(&buf, NULL);
 114 }
 115
 116 static void setup_git_env(void)
 117 {
 118         git_dir = getenv(GIT_DIR_ENVIRONMENT);
 119         git_dir = git_dir ? xstrdup(git_dir) : NULL;
 120         if (!git_dir) {
 121                 git_dir = read_gitfile(DEFAULT_GIT_DIR_ENVIRONMENT);
 122                 git_dir = git_dir ? xstrdup(git_dir) : NULL;
 123         }
 124         if (!git_dir)
 125                 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
 126         git_object_dir = getenv(DB_ENVIRONMENT);
 127         if (!git_object_dir) {
 128                 git_object_dir = xmalloc(strlen(git_dir) + 9);
 129                 sprintf(git_object_dir, "%s/objects", git_dir);
 130         }
 131         git_index_file = getenv(INDEX_ENVIRONMENT);
 132         if (!git_index_file) {
 133                 git_index_file = xmalloc(strlen(git_dir) + 7);
 134                 sprintf(git_index_file, "%s/index", git_dir);
 135         }
 136         git_graft_file = getenv(GRAFT_ENVIRONMENT);
 137         if (!git_graft_file)
 138                 git_graft_file = git_pathdup("info/grafts");
 139         if (getenv(NO_REPLACE_OBJECTS_ENVIRONMENT))
 140                 read_replace_refs = 0;
 141         namespace = expand_namespace(getenv(GIT_NAMESPACE_ENVIRONMENT));
 142         namespace_len = strlen(namespace);
 143 }
 144
 145 int is_bare_repository(void)
 146 {
 147         /* if core.bare is not 'false', let's see if there is a work tree */
 148         return is_bare_repository_cfg && !get_git_work_tree();
 149 }
 150
 151 int have_git_dir(void)
 152 {
 153         return !!git_dir;
 154 }
 155
 156 const char *get_git_dir(void)
 157 {
 158         if (!git_dir)
 159                 setup_git_env();
 160         return git_dir;
 161 }
 162
 163 const char *get_git_namespace(void)
 164 {
 165         if (!namespace)
 166                 setup_git_env();
 167         return namespace;
 168 }
 169
 170 const char *strip_namespace(const char *namespaced_ref)
 171 {
 172         if (prefixcmp(namespaced_ref, get_git_namespace()) != 0)
 173                 return NULL;
 174         return namespaced_ref + namespace_len;
 175 }
 176
 177 static int git_work_tree_initialized;
 178
 179 /*
 180  * Note.  This works only before you used a work tree.  This was added
 181  * primarily to support git-clone to work in a new repository it just
 182  * created, and is not meant to flip between different work trees.
 183  */
 184 void set_git_work_tree(const char *new_work_tree)
 185 {
 186         if (git_work_tree_initialized) {
 187                 new_work_tree = real_path(new_work_tree);
 188                 if (strcmp(new_work_tree, work_tree))
 189                         die("internal error: work tree has already been set\n"
 190                             "Current worktree: %s\nNew worktree: %s",
 191                             work_tree, new_work_tree);
 192                 return;
 193         }
 194         git_work_tree_initialized = 1;
 195         work_tree = xstrdup(real_path(new_work_tree));
 196 }
 197
 198 const char *get_git_work_tree(void)
 199 {
 200         return work_tree;
 201 }
 202
 203 char *get_object_directory(void)
 204 {
 205         if (!git_object_dir)
 206                 setup_git_env();
 207         return git_object_dir;
 208 }
 209
 210 int odb_mkstemp(char *template, size_t limit, const char *pattern)
 211 {
 212         int fd;
 213         /*
 214          * we let the umask do its job, don't try to be more
 215          * restrictive except to remove write permission.
 216          */
 217         int mode = 0444;
 218         snprintf(template, limit, "%s/%s",
 219                  get_object_directory(), pattern);
 220         fd = git_mkstemp_mode(template, mode);
 221         if (0 <= fd)
 222                 return fd;
 223
 224         /* slow path */
 225         /* some mkstemp implementations erase template on failure */
 226         snprintf(template, limit, "%s/%s",
 227                  get_object_directory(), pattern);
 228         safe_create_leading_directories(template);
 229         return xmkstemp_mode(template, mode);
 230 }
 231
 232 int odb_pack_keep(char *name, size_t namesz, unsigned char *sha1)
 233 {
 234         int fd;
 235
 236         snprintf(name, namesz, "%s/pack/pack-%s.keep",
 237                  get_object_directory(), sha1_to_hex(sha1));
 238         fd = open(name, O_RDWR|O_CREAT|O_EXCL, 0600);
 239         if (0 <= fd)
 240                 return fd;
 241
 242         /* slow path */
 243         safe_create_leading_directories(name);
 244         return open(name, O_RDWR|O_CREAT|O_EXCL, 0600);
 245 }
 246
 247 char *get_index_file(void)
 248 {
 249         if (!git_index_file)
 250                 setup_git_env();
 251         return git_index_file;
 252 }
 253
 254 char *get_graft_file(void)
 255 {
 256         if (!git_graft_file)
 257                 setup_git_env();
 258         return git_graft_file;
 259 }
 260
 261 int set_git_dir(const char *path)
 262 {
 263         if (setenv(GIT_DIR_ENVIRONMENT, path, 1))
 264                 return error("Could not set GIT_DIR to '%s'", path);
 265         setup_git_env();
 266         return 0;
 267 }
 268
 269 const char *get_log_output_encoding(void)
 270 {
 271         return git_log_output_encoding ? git_log_output_encoding
 272                 : get_commit_output_encoding();
 273 }
 274
 275 const char *get_commit_output_encoding(void)
 276 {
 277         return git_commit_encoding ? git_commit_encoding : "UTF-8";
 278 }