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 unique_abbrev_extra_length;
  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 const char *pager_program;
  39 int pager_use_color = 1;
  40 const char *editor_program;
  41 const char *askpass_program;
  42 const char *excludes_file;
  43 enum auto_crlf auto_crlf = AUTO_CRLF_FALSE;
  44 int read_replace_refs = 1;
  45 enum eol eol = EOL_UNSET;
  46 enum safe_crlf safe_crlf = SAFE_CRLF_WARN;
  47 unsigned whitespace_rule_cfg = WS_DEFAULT_RULE;
  48 enum branch_track git_branch_track = BRANCH_TRACK_REMOTE;
  49 enum rebase_setup_type autorebase = AUTOREBASE_NEVER;
  50 enum push_default_type push_default = PUSH_DEFAULT_MATCHING;
  51 #ifndef OBJECT_CREATION_MODE
  52 #define OBJECT_CREATION_MODE OBJECT_CREATION_USES_HARDLINKS
  53 #endif
  54 enum object_creation_mode object_creation_mode = OBJECT_CREATION_MODE;
  55 char *notes_ref_name;
  56 int grafts_replace_parents = 1;
  57 int core_apply_sparse_checkout;
  58 struct startup_info *startup_info;
  59
  60 /* Parallel index stat data preload? */
  61 int core_preload_index = 0;
  62
  63 /* This is set by setup_git_dir_gently() and/or git_default_config() */
  64 char *git_work_tree_cfg;
  65 static char *work_tree;
  66
  67 static const char *git_dir;
  68 static char *git_object_dir, *git_index_file, *git_graft_file;
  69
  70 /*
  71  * Repository-local GIT_* environment variables
  72  * Remember to update local_repo_env_size in cache.h when
  73  * the size of the list changes
  74  */
  75 const char * const local_repo_env[LOCAL_REPO_ENV_SIZE + 1] = {
  76         ALTERNATE_DB_ENVIRONMENT,
  77         CONFIG_ENVIRONMENT,
  78         CONFIG_DATA_ENVIRONMENT,
  79         DB_ENVIRONMENT,
  80         GIT_DIR_ENVIRONMENT,
  81         GIT_WORK_TREE_ENVIRONMENT,
  82         GRAFT_ENVIRONMENT,
  83         INDEX_ENVIRONMENT,
  84         NO_REPLACE_OBJECTS_ENVIRONMENT,
  85         NULL
  86 };
  87
  88 static void setup_git_env(void)
  89 {
  90         git_dir = getenv(GIT_DIR_ENVIRONMENT);
  91         git_dir = git_dir ? xstrdup(git_dir) : NULL;
  92         if (!git_dir) {
  93                 git_dir = read_gitfile_gently(DEFAULT_GIT_DIR_ENVIRONMENT);
  94                 git_dir = git_dir ? xstrdup(git_dir) : NULL;
  95         }
  96         if (!git_dir)
  97                 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
  98         git_object_dir = getenv(DB_ENVIRONMENT);
  99         if (!git_object_dir) {
 100                 git_object_dir = xmalloc(strlen(git_dir) + 9);
 101                 sprintf(git_object_dir, "%s/objects", git_dir);
 102         }
 103         git_index_file = getenv(INDEX_ENVIRONMENT);
 104         if (!git_index_file) {
 105                 git_index_file = xmalloc(strlen(git_dir) + 7);
 106                 sprintf(git_index_file, "%s/index", git_dir);
 107         }
 108         git_graft_file = getenv(GRAFT_ENVIRONMENT);
 109         if (!git_graft_file)
 110                 git_graft_file = git_pathdup("info/grafts");
 111         if (getenv(NO_REPLACE_OBJECTS_ENVIRONMENT))
 112                 read_replace_refs = 0;
 113 }
 114
 115 int is_bare_repository(void)
 116 {
 117         /* if core.bare is not 'false', let's see if there is a work tree */
 118         return is_bare_repository_cfg && !get_git_work_tree();
 119 }
 120
 121 int have_git_dir(void)
 122 {
 123         return !!git_dir;
 124 }
 125
 126 const char *get_git_dir(void)
 127 {
 128         if (!git_dir)
 129                 setup_git_env();
 130         return git_dir;
 131 }
 132
 133 static int git_work_tree_initialized;
 134
 135 /*
 136  * Note.  This works only before you used a work tree.  This was added
 137  * primarily to support git-clone to work in a new repository it just
 138  * created, and is not meant to flip between different work trees.
 139  */
 140 void set_git_work_tree(const char *new_work_tree)
 141 {
 142         if (is_bare_repository_cfg >= 0)
 143                 die("cannot set work tree after initialization");
 144         git_work_tree_initialized = 1;
 145         free(work_tree);
 146         work_tree = xstrdup(make_absolute_path(new_work_tree));
 147         is_bare_repository_cfg = 0;
 148 }
 149
 150 const char *get_git_work_tree(void)
 151 {
 152         if (!git_work_tree_initialized) {
 153                 work_tree = getenv(GIT_WORK_TREE_ENVIRONMENT);
 154                 /* core.bare = true overrides implicit and config work tree */
 155                 if (!work_tree && is_bare_repository_cfg < 1) {
 156                         work_tree = git_work_tree_cfg;
 157                         /* make_absolute_path also normalizes the path */
 158                         if (work_tree && !is_absolute_path(work_tree))
 159                                 work_tree = xstrdup(make_absolute_path(git_path("%s", work_tree)));
 160                 } else if (work_tree)
 161                         work_tree = xstrdup(make_absolute_path(work_tree));
 162                 git_work_tree_initialized = 1;
 163                 if (work_tree)
 164                         is_bare_repository_cfg = 0;
 165         }
 166         return work_tree;
 167 }
 168
 169 char *get_object_directory(void)
 170 {
 171         if (!git_object_dir)
 172                 setup_git_env();
 173         return git_object_dir;
 174 }
 175
 176 int odb_mkstemp(char *template, size_t limit, const char *pattern)
 177 {
 178         int fd;
 179         /*
 180          * we let the umask do its job, don't try to be more
 181          * restrictive except to remove write permission.
 182          */
 183         int mode = 0444;
 184         snprintf(template, limit, "%s/%s",
 185                  get_object_directory(), pattern);
 186         fd = git_mkstemp_mode(template, mode);
 187         if (0 <= fd)
 188                 return fd;
 189
 190         /* slow path */
 191         /* some mkstemp implementations erase template on failure */
 192         snprintf(template, limit, "%s/%s",
 193                  get_object_directory(), pattern);
 194         safe_create_leading_directories(template);
 195         return xmkstemp_mode(template, mode);
 196 }
 197
 198 int odb_pack_keep(char *name, size_t namesz, unsigned char *sha1)
 199 {
 200         int fd;
 201
 202         snprintf(name, namesz, "%s/pack/pack-%s.keep",
 203                  get_object_directory(), sha1_to_hex(sha1));
 204         fd = open(name, O_RDWR|O_CREAT|O_EXCL, 0600);
 205         if (0 <= fd)
 206                 return fd;
 207
 208         /* slow path */
 209         safe_create_leading_directories(name);
 210         return open(name, O_RDWR|O_CREAT|O_EXCL, 0600);
 211 }
 212
 213 char *get_index_file(void)
 214 {
 215         if (!git_index_file)
 216                 setup_git_env();
 217         return git_index_file;
 218 }
 219
 220 char *get_graft_file(void)
 221 {
 222         if (!git_graft_file)
 223                 setup_git_env();
 224         return git_graft_file;
 225 }
 226
 227 int set_git_dir(const char *path)
 228 {
 229         if (setenv(GIT_DIR_ENVIRONMENT, path, 1))
 230                 return error("Could not set GIT_DIR to '%s'", path);
 231         setup_git_env();
 232         return 0;
 233 }
 234
 235 const char *get_log_output_encoding(void)
 236 {
 237         return git_log_output_encoding ? git_log_output_encoding
 238                 : get_commit_output_encoding();
 239 }
 240
 241 const char *get_commit_output_encoding(void)
 242 {
 243         return git_commit_encoding ? git_commit_encoding : "UTF-8";
 244 }