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
  12 char git_default_email[MAX_GITNAME];
  13 char git_default_name[MAX_GITNAME];
  14 int user_ident_explicitly_given;
  15 int trust_executable_bit = 1;
  16 int trust_ctime = 1;
  17 int has_symlinks = 1;
  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 int zlib_compression_level = Z_BEST_SPEED;
  31 int core_compression_level;
  32 int core_compression_seen;
  33 int fsync_object_files;
  34 size_t packed_git_window_size = DEFAULT_PACKED_GIT_WINDOW_SIZE;
  35 size_t packed_git_limit = DEFAULT_PACKED_GIT_LIMIT;
  36 size_t delta_base_cache_limit = 16 * 1024 * 1024;
  37 const char *pager_program;
  38 int pager_use_color = 1;
  39 const char *editor_program;
  40 const char *askpass_program;
  41 const char *excludes_file;
  42 enum auto_crlf auto_crlf = AUTO_CRLF_FALSE;
  43 int read_replace_refs = 1;
  44 enum eol eol = EOL_UNSET;
  45 enum safe_crlf safe_crlf = SAFE_CRLF_WARN;
  46 unsigned whitespace_rule_cfg = WS_DEFAULT_RULE;
  47 enum branch_track git_branch_track = BRANCH_TRACK_REMOTE;
  48 enum rebase_setup_type autorebase = AUTOREBASE_NEVER;
  49 enum push_default_type push_default = PUSH_DEFAULT_MATCHING;
  50 #ifndef OBJECT_CREATION_MODE
  51 #define OBJECT_CREATION_MODE OBJECT_CREATION_USES_HARDLINKS
  52 #endif
  53 enum object_creation_mode object_creation_mode = OBJECT_CREATION_MODE;
  54 char *notes_ref_name;
  55 int grafts_replace_parents = 1;
  56 int core_apply_sparse_checkout;
  57 struct startup_info *startup_info;
  58
  59 /* Parallel index stat data preload? */
  60 int core_preload_index = 0;
  61
  62 /* This is set by setup_git_dir_gently() and/or git_default_config() */
  63 char *git_work_tree_cfg;
  64 static char *work_tree;
  65
  66 static const char *git_dir;
  67 static char *git_object_dir, *git_index_file, *git_graft_file;
  68
  69 /*
  70  * Repository-local GIT_* environment variables
  71  * Remember to update local_repo_env_size in cache.h when
  72  * the size of the list changes
  73  */
  74 const char * const local_repo_env[LOCAL_REPO_ENV_SIZE + 1] = {
  75         ALTERNATE_DB_ENVIRONMENT,
  76         CONFIG_ENVIRONMENT,
  77         CONFIG_DATA_ENVIRONMENT,
  78         DB_ENVIRONMENT,
  79         GIT_DIR_ENVIRONMENT,
  80         GIT_WORK_TREE_ENVIRONMENT,
  81         GRAFT_ENVIRONMENT,
  82         INDEX_ENVIRONMENT,
  83         NO_REPLACE_OBJECTS_ENVIRONMENT,
  84         NULL
  85 };
  86
  87 static void setup_git_env(void)
  88 {
  89         git_dir = getenv(GIT_DIR_ENVIRONMENT);
  90         git_dir = git_dir ? xstrdup(git_dir) : NULL;
  91         if (!git_dir) {
  92                 git_dir = read_gitfile_gently(DEFAULT_GIT_DIR_ENVIRONMENT);
  93                 git_dir = git_dir ? xstrdup(git_dir) : NULL;
  94         }
  95         if (!git_dir)
  96                 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
  97         git_object_dir = getenv(DB_ENVIRONMENT);
  98         if (!git_object_dir) {
  99                 git_object_dir = xmalloc(strlen(git_dir) + 9);
 100                 sprintf(git_object_dir, "%s/objects", git_dir);
 101         }
 102         git_index_file = getenv(INDEX_ENVIRONMENT);
 103         if (!git_index_file) {
 104                 git_index_file = xmalloc(strlen(git_dir) + 7);
 105                 sprintf(git_index_file, "%s/index", git_dir);
 106         }
 107         git_graft_file = getenv(GRAFT_ENVIRONMENT);
 108         if (!git_graft_file)
 109                 git_graft_file = git_pathdup("info/grafts");
 110         if (getenv(NO_REPLACE_OBJECTS_ENVIRONMENT))
 111                 read_replace_refs = 0;
 112 }
 113
 114 int is_bare_repository(void)
 115 {
 116         /* if core.bare is not 'false', let's see if there is a work tree */
 117         return is_bare_repository_cfg && !get_git_work_tree();
 118 }
 119
 120 int have_git_dir(void)
 121 {
 122         return !!git_dir;
 123 }
 124
 125 const char *get_git_dir(void)
 126 {
 127         if (!git_dir)
 128                 setup_git_env();
 129         return git_dir;
 130 }
 131
 132 static int git_work_tree_initialized;
 133
 134 /*
 135  * Note.  This works only before you used a work tree.  This was added
 136  * primarily to support git-clone to work in a new repository it just
 137  * created, and is not meant to flip between different work trees.
 138  */
 139 void set_git_work_tree(const char *new_work_tree)
 140 {
 141         if (git_work_tree_initialized) {
 142                 new_work_tree = make_absolute_path(new_work_tree);
 143                 if (strcmp(new_work_tree, work_tree))
 144                         die("internal error: work tree has already been set\n"
 145                             "Current worktree: %s\nNew worktree: %s",
 146                             work_tree, new_work_tree);
 147                 return;
 148         }
 149         git_work_tree_initialized = 1;
 150         work_tree = xstrdup(make_absolute_path(new_work_tree));
 151 }
 152
 153 const char *get_git_work_tree(void)
 154 {
 155         return work_tree;
 156 }
 157
 158 char *get_object_directory(void)
 159 {
 160         if (!git_object_dir)
 161                 setup_git_env();
 162         return git_object_dir;
 163 }
 164
 165 int odb_mkstemp(char *template, size_t limit, const char *pattern)
 166 {
 167         int fd;
 168         /*
 169          * we let the umask do its job, don't try to be more
 170          * restrictive except to remove write permission.
 171          */
 172         int mode = 0444;
 173         snprintf(template, limit, "%s/%s",
 174                  get_object_directory(), pattern);
 175         fd = git_mkstemp_mode(template, mode);
 176         if (0 <= fd)
 177                 return fd;
 178
 179         /* slow path */
 180         /* some mkstemp implementations erase template on failure */
 181         snprintf(template, limit, "%s/%s",
 182                  get_object_directory(), pattern);
 183         safe_create_leading_directories(template);
 184         return xmkstemp_mode(template, mode);
 185 }
 186
 187 int odb_pack_keep(char *name, size_t namesz, unsigned char *sha1)
 188 {
 189         int fd;
 190
 191         snprintf(name, namesz, "%s/pack/pack-%s.keep",
 192                  get_object_directory(), sha1_to_hex(sha1));
 193         fd = open(name, O_RDWR|O_CREAT|O_EXCL, 0600);
 194         if (0 <= fd)
 195                 return fd;
 196
 197         /* slow path */
 198         safe_create_leading_directories(name);
 199         return open(name, O_RDWR|O_CREAT|O_EXCL, 0600);
 200 }
 201
 202 char *get_index_file(void)
 203 {
 204         if (!git_index_file)
 205                 setup_git_env();
 206         return git_index_file;
 207 }
 208
 209 char *get_graft_file(void)
 210 {
 211         if (!git_graft_file)
 212                 setup_git_env();
 213         return git_graft_file;
 214 }
 215
 216 int set_git_dir(const char *path)
 217 {
 218         if (setenv(GIT_DIR_ENVIRONMENT, path, 1))
 219                 return error("Could not set GIT_DIR to '%s'", path);
 220         setup_git_env();
 221         return 0;
 222 }
 223
 224 const char *get_log_output_encoding(void)
 225 {
 226         return git_log_output_encoding ? git_log_output_encoding
 227                 : get_commit_output_encoding();
 228 }
 229
 230 const char *get_commit_output_encoding(void)
 231 {
 232         return git_commit_encoding ? git_commit_encoding : "UTF-8";
 233 }