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 warn_on_object_refname_ambiguity = 1;
  26 int repository_format_version;
  27 const char *git_commit_encoding;
  28 const char *git_log_output_encoding;
  29 int shared_repository = PERM_UMASK;
  30 const char *apply_default_whitespace;
  31 const char *apply_default_ignorewhitespace;
  32 const char *git_attributes_file;
  33 int zlib_compression_level = Z_BEST_SPEED;
  34 int core_compression_level;
  35 int core_compression_seen;
  36 int fsync_object_files;
  37 size_t packed_git_window_size = DEFAULT_PACKED_GIT_WINDOW_SIZE;
  38 size_t packed_git_limit = DEFAULT_PACKED_GIT_LIMIT;
  39 size_t delta_base_cache_limit = 16 * 1024 * 1024;
  40 unsigned long big_file_threshold = 512 * 1024 * 1024;
  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 #ifndef PROTECT_HFS_DEFAULT
  67 #define PROTECT_HFS_DEFAULT 0
  68 #endif
  69 int protect_hfs = PROTECT_HFS_DEFAULT;
  70
  71 #ifndef PROTECT_NTFS_DEFAULT
  72 #define PROTECT_NTFS_DEFAULT 0
  73 #endif
  74 int protect_ntfs = PROTECT_NTFS_DEFAULT;
  75
  76 /*
  77  * The character that begins a commented line in user-editable file
  78  * that is subject to stripspace.
  79  */
  80 char comment_line_char = '#';
  81
  82 /* Parallel index stat data preload? */
  83 int core_preload_index = 0;
  84
  85 /* This is set by setup_git_dir_gently() and/or git_default_config() */
  86 char *git_work_tree_cfg;
  87 static char *work_tree;
  88
  89 static const char *namespace;
  90 static size_t namespace_len;
  91
  92 static const char *git_dir;
  93 static char *git_object_dir, *git_index_file, *git_graft_file;
  94
  95 /*
  96  * Repository-local GIT_* environment variables; see cache.h for details.
  97  */
  98 const char * const local_repo_env[] = {
  99         ALTERNATE_DB_ENVIRONMENT,
 100         CONFIG_ENVIRONMENT,
 101         CONFIG_DATA_ENVIRONMENT,
 102         DB_ENVIRONMENT,
 103         GIT_DIR_ENVIRONMENT,
 104         GIT_WORK_TREE_ENVIRONMENT,
 105         GIT_IMPLICIT_WORK_TREE_ENVIRONMENT,
 106         GRAFT_ENVIRONMENT,
 107         INDEX_ENVIRONMENT,
 108         NO_REPLACE_OBJECTS_ENVIRONMENT,
 109         GIT_PREFIX_ENVIRONMENT,
 110         NULL
 111 };
 112
 113 static char *expand_namespace(const char *raw_namespace)
 114 {
 115         struct strbuf buf = STRBUF_INIT;
 116         struct strbuf **components, **c;
 117
 118         if (!raw_namespace || !*raw_namespace)
 119                 return xstrdup("");
 120
 121         strbuf_addstr(&buf, raw_namespace);
 122         components = strbuf_split(&buf, '/');
 123         strbuf_reset(&buf);
 124         for (c = components; *c; c++)
 125                 if (strcmp((*c)->buf, "/") != 0)
 126                         strbuf_addf(&buf, "refs/namespaces/%s", (*c)->buf);
 127         strbuf_list_free(components);
 128         if (check_refname_format(buf.buf, 0))
 129                 die("bad git namespace path \"%s\"", raw_namespace);
 130         strbuf_addch(&buf, '/');
 131         return strbuf_detach(&buf, NULL);
 132 }
 133
 134 static void setup_git_env(void)
 135 {
 136         const char *gitfile;
 137
 138         git_dir = getenv(GIT_DIR_ENVIRONMENT);
 139         if (!git_dir)
 140                 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
 141         gitfile = read_gitfile(git_dir);
 142         git_dir = xstrdup(gitfile ? gitfile : git_dir);
 143         git_object_dir = getenv(DB_ENVIRONMENT);
 144         if (!git_object_dir) {
 145                 git_object_dir = xmalloc(strlen(git_dir) + 9);
 146                 sprintf(git_object_dir, "%s/objects", git_dir);
 147         }
 148         git_index_file = getenv(INDEX_ENVIRONMENT);
 149         if (!git_index_file) {
 150                 git_index_file = xmalloc(strlen(git_dir) + 7);
 151                 sprintf(git_index_file, "%s/index", git_dir);
 152         }
 153         git_graft_file = getenv(GRAFT_ENVIRONMENT);
 154         if (!git_graft_file)
 155                 git_graft_file = git_pathdup("info/grafts");
 156         if (getenv(NO_REPLACE_OBJECTS_ENVIRONMENT))
 157                 read_replace_refs = 0;
 158         namespace = expand_namespace(getenv(GIT_NAMESPACE_ENVIRONMENT));
 159         namespace_len = strlen(namespace);
 160 }
 161
 162 int is_bare_repository(void)
 163 {
 164         /* if core.bare is not 'false', let's see if there is a work tree */
 165         return is_bare_repository_cfg && !get_git_work_tree();
 166 }
 167
 168 const char *get_git_dir(void)
 169 {
 170         if (!git_dir)
 171                 setup_git_env();
 172         return git_dir;
 173 }
 174
 175 const char *get_git_namespace(void)
 176 {
 177         if (!namespace)
 178                 setup_git_env();
 179         return namespace;
 180 }
 181
 182 const char *strip_namespace(const char *namespaced_ref)
 183 {
 184         if (prefixcmp(namespaced_ref, get_git_namespace()) != 0)
 185                 return NULL;
 186         return namespaced_ref + namespace_len;
 187 }
 188
 189 static int git_work_tree_initialized;
 190
 191 /*
 192  * Note.  This works only before you used a work tree.  This was added
 193  * primarily to support git-clone to work in a new repository it just
 194  * created, and is not meant to flip between different work trees.
 195  */
 196 void set_git_work_tree(const char *new_work_tree)
 197 {
 198         if (git_work_tree_initialized) {
 199                 new_work_tree = real_path(new_work_tree);
 200                 if (strcmp(new_work_tree, work_tree))
 201                         die("internal error: work tree has already been set\n"
 202                             "Current worktree: %s\nNew worktree: %s",
 203                             work_tree, new_work_tree);
 204                 return;
 205         }
 206         git_work_tree_initialized = 1;
 207         work_tree = xstrdup(real_path(new_work_tree));
 208 }
 209
 210 const char *get_git_work_tree(void)
 211 {
 212         return work_tree;
 213 }
 214
 215 char *get_object_directory(void)
 216 {
 217         if (!git_object_dir)
 218                 setup_git_env();
 219         return git_object_dir;
 220 }
 221
 222 int odb_mkstemp(char *template, size_t limit, const char *pattern)
 223 {
 224         int fd;
 225         /*
 226          * we let the umask do its job, don't try to be more
 227          * restrictive except to remove write permission.
 228          */
 229         int mode = 0444;
 230         snprintf(template, limit, "%s/%s",
 231                  get_object_directory(), pattern);
 232         fd = git_mkstemp_mode(template, mode);
 233         if (0 <= fd)
 234                 return fd;
 235
 236         /* slow path */
 237         /* some mkstemp implementations erase template on failure */
 238         snprintf(template, limit, "%s/%s",
 239                  get_object_directory(), pattern);
 240         safe_create_leading_directories(template);
 241         return xmkstemp_mode(template, mode);
 242 }
 243
 244 int odb_pack_keep(char *name, size_t namesz, unsigned char *sha1)
 245 {
 246         int fd;
 247
 248         snprintf(name, namesz, "%s/pack/pack-%s.keep",
 249                  get_object_directory(), sha1_to_hex(sha1));
 250         fd = open(name, O_RDWR|O_CREAT|O_EXCL, 0600);
 251         if (0 <= fd)
 252                 return fd;
 253
 254         /* slow path */
 255         safe_create_leading_directories(name);
 256         return open(name, O_RDWR|O_CREAT|O_EXCL, 0600);
 257 }
 258
 259 char *get_index_file(void)
 260 {
 261         if (!git_index_file)
 262                 setup_git_env();
 263         return git_index_file;
 264 }
 265
 266 char *get_graft_file(void)
 267 {
 268         if (!git_graft_file)
 269                 setup_git_env();
 270         return git_graft_file;
 271 }
 272
 273 int set_git_dir(const char *path)
 274 {
 275         if (setenv(GIT_DIR_ENVIRONMENT, path, 1))
 276                 return error("Could not set GIT_DIR to '%s'", path);
 277         setup_git_env();
 278         return 0;
 279 }
 280
 281 const char *get_log_output_encoding(void)
 282 {
 283         return git_log_output_encoding ? git_log_output_encoding
 284                 : get_commit_output_encoding();
 285 }
 286
 287 const char *get_commit_output_encoding(void)
 288 {
 289         return git_commit_encoding ? git_commit_encoding : "UTF-8";
 290 }