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 check_stat = 1;
  17 int has_symlinks = 1;
  18 int minimum_abbrev = 4, default_abbrev = 7;
  19 int ignore_case;
  20 int assume_unchanged;
  21 int prefer_symlink_refs;
  22 int is_bare_repository_cfg = -1; /* unspecified */
  23 int log_all_ref_updates = -1; /* unspecified */
  24 int warn_ambiguous_refs = 1;
  25 int repository_format_version;
  26 const char *git_commit_encoding;
  27 const char *git_log_output_encoding;
  28 int shared_repository = PERM_UMASK;
  29 const char *apply_default_whitespace;
  30 const char *apply_default_ignorewhitespace;
  31 const char *git_attributes_file;
  32 int zlib_compression_level = Z_BEST_SPEED;
  33 int core_compression_level;
  34 int core_compression_seen;
  35 int fsync_object_files;
  36 size_t packed_git_window_size = DEFAULT_PACKED_GIT_WINDOW_SIZE;
  37 size_t packed_git_limit = DEFAULT_PACKED_GIT_LIMIT;
  38 size_t delta_base_cache_limit = 16 * 1024 * 1024;
  39 unsigned long big_file_threshold = 512 * 1024 * 1024;
  40 const char *log_pack_access;
  41 const char *pager_program;
  42 int pager_use_color = 1;
  43 const char *editor_program;
  44 const char *askpass_program;
  45 const char *excludes_file;
  46 enum auto_crlf auto_crlf = AUTO_CRLF_FALSE;
  47 int read_replace_refs = 1; /* NEEDSWORK: rename to use_replace_refs */
  48 enum eol core_eol = EOL_UNSET;
  49 enum safe_crlf safe_crlf = SAFE_CRLF_WARN;
  50 unsigned whitespace_rule_cfg = WS_DEFAULT_RULE;
  51 enum branch_track git_branch_track = BRANCH_TRACK_REMOTE;
  52 enum rebase_setup_type autorebase = AUTOREBASE_NEVER;
  53 enum push_default_type push_default = PUSH_DEFAULT_UNSPECIFIED;
  54 #ifndef OBJECT_CREATION_MODE
  55 #define OBJECT_CREATION_MODE OBJECT_CREATION_USES_HARDLINKS
  56 #endif
  57 enum object_creation_mode object_creation_mode = OBJECT_CREATION_MODE;
  58 char *notes_ref_name;
  59 int grafts_replace_parents = 1;
  60 int core_apply_sparse_checkout;
  61 int merge_log_config = -1;
  62 int precomposed_unicode = -1; /* see probe_utf8_pathname_composition() */
  63 struct startup_info *startup_info;
  64 unsigned long pack_size_limit_cfg;
  65
  66 /*
  67  * The character that begins a commented line in user-editable file
  68  * that is subject to stripspace.
  69  */
  70 char comment_line_char = '#';
  71
  72 /* Parallel index stat data preload? */
  73 int core_preload_index = 0;
  74
  75 /* This is set by setup_git_dir_gently() and/or git_default_config() */
  76 char *git_work_tree_cfg;
  77 static char *work_tree;
  78
  79 static const char *namespace;
  80 static size_t namespace_len;
  81
  82 static const char *git_dir;
  83 static char *git_object_dir, *git_index_file, *git_graft_file;
  84
  85 /*
  86  * Repository-local GIT_* environment variables; see cache.h for details.
  87  */
  88 const char * const local_repo_env[] = {
  89         ALTERNATE_DB_ENVIRONMENT,
  90         CONFIG_ENVIRONMENT,
  91         CONFIG_DATA_ENVIRONMENT,
  92         DB_ENVIRONMENT,
  93         GIT_DIR_ENVIRONMENT,
  94         GIT_WORK_TREE_ENVIRONMENT,
  95         GIT_IMPLICIT_WORK_TREE_ENVIRONMENT,
  96         GRAFT_ENVIRONMENT,
  97         INDEX_ENVIRONMENT,
  98         NO_REPLACE_OBJECTS_ENVIRONMENT,
  99         GIT_PREFIX_ENVIRONMENT,
 100         NULL
 101 };
 102
 103 static char *expand_namespace(const char *raw_namespace)
 104 {
 105         struct strbuf buf = STRBUF_INIT;
 106         struct strbuf **components, **c;
 107
 108         if (!raw_namespace || !*raw_namespace)
 109                 return xstrdup("");
 110
 111         strbuf_addstr(&buf, raw_namespace);
 112         components = strbuf_split(&buf, '/');
 113         strbuf_reset(&buf);
 114         for (c = components; *c; c++)
 115                 if (strcmp((*c)->buf, "/") != 0)
 116                         strbuf_addf(&buf, "refs/namespaces/%s", (*c)->buf);
 117         strbuf_list_free(components);
 118         if (check_refname_format(buf.buf, 0))
 119                 die("bad git namespace path \"%s\"", raw_namespace);
 120         strbuf_addch(&buf, '/');
 121         return strbuf_detach(&buf, NULL);
 122 }
 123
 124 static void setup_git_env(void)
 125 {
 126         const char *gitfile;
 127
 128         git_dir = getenv(GIT_DIR_ENVIRONMENT);
 129         if (!git_dir)
 130                 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
 131         gitfile = read_gitfile(git_dir);
 132         git_dir = xstrdup(gitfile ? gitfile : git_dir);
 133         git_object_dir = getenv(DB_ENVIRONMENT);
 134         if (!git_object_dir) {
 135                 git_object_dir = xmalloc(strlen(git_dir) + 9);
 136                 sprintf(git_object_dir, "%s/objects", git_dir);
 137         }
 138         git_index_file = getenv(INDEX_ENVIRONMENT);
 139         if (!git_index_file) {
 140                 git_index_file = xmalloc(strlen(git_dir) + 7);
 141                 sprintf(git_index_file, "%s/index", git_dir);
 142         }
 143         git_graft_file = getenv(GRAFT_ENVIRONMENT);
 144         if (!git_graft_file)
 145                 git_graft_file = git_pathdup("info/grafts");
 146         if (getenv(NO_REPLACE_OBJECTS_ENVIRONMENT))
 147                 read_replace_refs = 0;
 148         namespace = expand_namespace(getenv(GIT_NAMESPACE_ENVIRONMENT));
 149         namespace_len = strlen(namespace);
 150 }
 151
 152 int is_bare_repository(void)
 153 {
 154         /* if core.bare is not 'false', let's see if there is a work tree */
 155         return is_bare_repository_cfg && !get_git_work_tree();
 156 }
 157
 158 int have_git_dir(void)
 159 {
 160         return !!git_dir;
 161 }
 162
 163 const char *get_git_dir(void)
 164 {
 165         if (!git_dir)
 166                 setup_git_env();
 167         return git_dir;
 168 }
 169
 170 const char *get_git_namespace(void)
 171 {
 172         if (!namespace)
 173                 setup_git_env();
 174         return namespace;
 175 }
 176
 177 const char *strip_namespace(const char *namespaced_ref)
 178 {
 179         if (prefixcmp(namespaced_ref, get_git_namespace()) != 0)
 180                 return NULL;
 181         return namespaced_ref + namespace_len;
 182 }
 183
 184 static int git_work_tree_initialized;
 185
 186 /*
 187  * Note.  This works only before you used a work tree.  This was added
 188  * primarily to support git-clone to work in a new repository it just
 189  * created, and is not meant to flip between different work trees.
 190  */
 191 void set_git_work_tree(const char *new_work_tree)
 192 {
 193         if (git_work_tree_initialized) {
 194                 new_work_tree = real_path(new_work_tree);
 195                 if (strcmp(new_work_tree, work_tree))
 196                         die("internal error: work tree has already been set\n"
 197                             "Current worktree: %s\nNew worktree: %s",
 198                             work_tree, new_work_tree);
 199                 return;
 200         }
 201         git_work_tree_initialized = 1;
 202         work_tree = xstrdup(real_path(new_work_tree));
 203 }
 204
 205 const char *get_git_work_tree(void)
 206 {
 207         return work_tree;
 208 }
 209
 210 char *get_object_directory(void)
 211 {
 212         if (!git_object_dir)
 213                 setup_git_env();
 214         return git_object_dir;
 215 }
 216
 217 int odb_mkstemp(char *template, size_t limit, const char *pattern)
 218 {
 219         int fd;
 220         /*
 221          * we let the umask do its job, don't try to be more
 222          * restrictive except to remove write permission.
 223          */
 224         int mode = 0444;
 225         snprintf(template, limit, "%s/%s",
 226                  get_object_directory(), pattern);
 227         fd = git_mkstemp_mode(template, mode);
 228         if (0 <= fd)
 229                 return fd;
 230
 231         /* slow path */
 232         /* some mkstemp implementations erase template on failure */
 233         snprintf(template, limit, "%s/%s",
 234                  get_object_directory(), pattern);
 235         safe_create_leading_directories(template);
 236         return xmkstemp_mode(template, mode);
 237 }
 238
 239 int odb_pack_keep(char *name, size_t namesz, unsigned char *sha1)
 240 {
 241         int fd;
 242
 243         snprintf(name, namesz, "%s/pack/pack-%s.keep",
 244                  get_object_directory(), sha1_to_hex(sha1));
 245         fd = open(name, O_RDWR|O_CREAT|O_EXCL, 0600);
 246         if (0 <= fd)
 247                 return fd;
 248
 249         /* slow path */
 250         safe_create_leading_directories(name);
 251         return open(name, O_RDWR|O_CREAT|O_EXCL, 0600);
 252 }
 253
 254 char *get_index_file(void)
 255 {
 256         if (!git_index_file)
 257                 setup_git_env();
 258         return git_index_file;
 259 }
 260
 261 char *get_graft_file(void)
 262 {
 263         if (!git_graft_file)
 264                 setup_git_env();
 265         return git_graft_file;
 266 }
 267
 268 int set_git_dir(const char *path)
 269 {
 270         if (setenv(GIT_DIR_ENVIRONMENT, path, 1))
 271                 return error("Could not set GIT_DIR to '%s'", path);
 272         setup_git_env();
 273         return 0;
 274 }
 275
 276 const char *get_log_output_encoding(void)
 277 {
 278         return git_log_output_encoding ? git_log_output_encoding
 279                 : get_commit_output_encoding();
 280 }
 281
 282 const char *get_commit_output_encoding(void)
 283 {
 284         return git_commit_encoding ? git_commit_encoding : "UTF-8";
 285 }