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 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 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 *pager_program;
  40 int pager_use_color = 1;
  41 const char *editor_program;
  42 const char *askpass_program;
  43 const char *excludes_file;
  44 enum auto_crlf auto_crlf = AUTO_CRLF_FALSE;
  45 int read_replace_refs = 1;
  46 enum eol eol = EOL_UNSET;
  47 enum safe_crlf safe_crlf = SAFE_CRLF_WARN;
  48 unsigned whitespace_rule_cfg = WS_DEFAULT_RULE;
  49 enum branch_track git_branch_track = BRANCH_TRACK_REMOTE;
  50 enum rebase_setup_type autorebase = AUTOREBASE_NEVER;
  51 enum push_default_type push_default = PUSH_DEFAULT_MATCHING;
  52 #ifndef OBJECT_CREATION_MODE
  53 #define OBJECT_CREATION_MODE OBJECT_CREATION_USES_HARDLINKS
  54 #endif
  55 enum object_creation_mode object_creation_mode = OBJECT_CREATION_MODE;
  56 char *notes_ref_name;
  57 int grafts_replace_parents = 1;
  58 int core_apply_sparse_checkout;
  59 struct startup_info *startup_info;
  60
  61 /* Parallel index stat data preload? */
  62 int core_preload_index = 0;
  63
  64 /* This is set by setup_git_dir_gently() and/or git_default_config() */
  65 char *git_work_tree_cfg;
  66 static char *work_tree;
  67
  68 static const char *git_dir;
  69 static char *git_object_dir, *git_index_file, *git_graft_file;
  70
  71 /*
  72  * Repository-local GIT_* environment variables
  73  * Remember to update local_repo_env_size in cache.h when
  74  * the size of the list changes
  75  */
  76 const char * const local_repo_env[LOCAL_REPO_ENV_SIZE + 1] = {
  77         ALTERNATE_DB_ENVIRONMENT,
  78         CONFIG_ENVIRONMENT,
  79         CONFIG_DATA_ENVIRONMENT,
  80         DB_ENVIRONMENT,
  81         GIT_DIR_ENVIRONMENT,
  82         GIT_WORK_TREE_ENVIRONMENT,
  83         GRAFT_ENVIRONMENT,
  84         INDEX_ENVIRONMENT,
  85         NO_REPLACE_OBJECTS_ENVIRONMENT,
  86         NULL
  87 };
  88
  89 static void setup_git_env(void)
  90 {
  91         git_dir = getenv(GIT_DIR_ENVIRONMENT);
  92         git_dir = git_dir ? xstrdup(git_dir) : NULL;
  93         if (!git_dir) {
  94                 git_dir = read_gitfile_gently(DEFAULT_GIT_DIR_ENVIRONMENT);
  95                 git_dir = git_dir ? xstrdup(git_dir) : NULL;
  96         }
  97         if (!git_dir)
  98                 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
  99         git_object_dir = getenv(DB_ENVIRONMENT);
 100         if (!git_object_dir) {
 101                 git_object_dir = xmalloc(strlen(git_dir) + 9);
 102                 sprintf(git_object_dir, "%s/objects", git_dir);
 103         }
 104         git_index_file = getenv(INDEX_ENVIRONMENT);
 105         if (!git_index_file) {
 106                 git_index_file = xmalloc(strlen(git_dir) + 7);
 107                 sprintf(git_index_file, "%s/index", git_dir);
 108         }
 109         git_graft_file = getenv(GRAFT_ENVIRONMENT);
 110         if (!git_graft_file)
 111                 git_graft_file = git_pathdup("info/grafts");
 112         if (getenv(NO_REPLACE_OBJECTS_ENVIRONMENT))
 113                 read_replace_refs = 0;
 114 }
 115
 116 int is_bare_repository(void)
 117 {
 118         /* if core.bare is not 'false', let's see if there is a work tree */
 119         return is_bare_repository_cfg && !get_git_work_tree();
 120 }
 121
 122 int have_git_dir(void)
 123 {
 124         return !!git_dir;
 125 }
 126
 127 const char *get_git_dir(void)
 128 {
 129         if (!git_dir)
 130                 setup_git_env();
 131         return git_dir;
 132 }
 133
 134 static int git_work_tree_initialized;
 135
 136 /*
 137  * Note.  This works only before you used a work tree.  This was added
 138  * primarily to support git-clone to work in a new repository it just
 139  * created, and is not meant to flip between different work trees.
 140  */
 141 void set_git_work_tree(const char *new_work_tree)
 142 {
 143         if (git_work_tree_initialized) {
 144                 new_work_tree = real_path(new_work_tree);
 145                 if (strcmp(new_work_tree, work_tree))
 146                         die("internal error: work tree has already been set\n"
 147                             "Current worktree: %s\nNew worktree: %s",
 148                             work_tree, new_work_tree);
 149                 return;
 150         }
 151         git_work_tree_initialized = 1;
 152         work_tree = xstrdup(real_path(new_work_tree));
 153 }
 154
 155 const char *get_git_work_tree(void)
 156 {
 157         return work_tree;
 158 }
 159
 160 char *get_object_directory(void)
 161 {
 162         if (!git_object_dir)
 163                 setup_git_env();
 164         return git_object_dir;
 165 }
 166
 167 int odb_mkstemp(char *template, size_t limit, const char *pattern)
 168 {
 169         int fd;
 170         /*
 171          * we let the umask do its job, don't try to be more
 172          * restrictive except to remove write permission.
 173          */
 174         int mode = 0444;
 175         snprintf(template, limit, "%s/%s",
 176                  get_object_directory(), pattern);
 177         fd = git_mkstemp_mode(template, mode);
 178         if (0 <= fd)
 179                 return fd;
 180
 181         /* slow path */
 182         /* some mkstemp implementations erase template on failure */
 183         snprintf(template, limit, "%s/%s",
 184                  get_object_directory(), pattern);
 185         safe_create_leading_directories(template);
 186         return xmkstemp_mode(template, mode);
 187 }
 188
 189 int odb_pack_keep(char *name, size_t namesz, unsigned char *sha1)
 190 {
 191         int fd;
 192
 193         snprintf(name, namesz, "%s/pack/pack-%s.keep",
 194                  get_object_directory(), sha1_to_hex(sha1));
 195         fd = open(name, O_RDWR|O_CREAT|O_EXCL, 0600);
 196         if (0 <= fd)
 197                 return fd;
 198
 199         /* slow path */
 200         safe_create_leading_directories(name);
 201         return open(name, O_RDWR|O_CREAT|O_EXCL, 0600);
 202 }
 203
 204 char *get_index_file(void)
 205 {
 206         if (!git_index_file)
 207                 setup_git_env();
 208         return git_index_file;
 209 }
 210
 211 char *get_graft_file(void)
 212 {
 213         if (!git_graft_file)
 214                 setup_git_env();
 215         return git_graft_file;
 216 }
 217
 218 int set_git_dir(const char *path)
 219 {
 220         if (setenv(GIT_DIR_ENVIRONMENT, path, 1))
 221                 return error("Could not set GIT_DIR to '%s'", path);
 222         setup_git_env();
 223         return 0;
 224 }
 225
 226 const char *get_log_output_encoding(void)
 227 {
 228         return git_log_output_encoding ? git_log_output_encoding
 229                 : get_commit_output_encoding();
 230 }
 231
 232 const char *get_commit_output_encoding(void)
 233 {
 234         return git_commit_encoding ? git_commit_encoding : "UTF-8";
 235 }