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 #include "commit.h"
  14
  15 int trust_executable_bit = 1;
  16 int trust_ctime = 1;
  17 int check_stat = 1;
  18 int has_symlinks = 1;
  19 int minimum_abbrev = 4, default_abbrev = 7;
  20 int ignore_case;
  21 int assume_unchanged;
  22 int prefer_symlink_refs;
  23 int is_bare_repository_cfg = -1; /* unspecified */
  24 int log_all_ref_updates = -1; /* unspecified */
  25 int warn_ambiguous_refs = 1;
  26 int warn_on_object_refname_ambiguity = 1;
  27 int repository_format_version;
  28 const char *git_commit_encoding;
  29 const char *git_log_output_encoding;
  30 int shared_repository = PERM_UMASK;
  31 const char *apply_default_whitespace;
  32 const char *apply_default_ignorewhitespace;
  33 const char *git_attributes_file;
  34 int zlib_compression_level = Z_BEST_SPEED;
  35 int core_compression_level;
  36 int core_compression_seen;
  37 int fsync_object_files;
  38 size_t packed_git_window_size = DEFAULT_PACKED_GIT_WINDOW_SIZE;
  39 size_t packed_git_limit = DEFAULT_PACKED_GIT_LIMIT;
  40 size_t delta_base_cache_limit = 16 * 1024 * 1024;
  41 unsigned long big_file_threshold = 512 * 1024 * 1024;
  42 const char *pager_program;
  43 int pager_use_color = 1;
  44 const char *editor_program;
  45 const char *askpass_program;
  46 const char *excludes_file;
  47 enum auto_crlf auto_crlf = AUTO_CRLF_FALSE;
  48 int check_replace_refs = 1;
  49 enum eol core_eol = EOL_UNSET;
  50 enum safe_crlf safe_crlf = SAFE_CRLF_WARN;
  51 unsigned whitespace_rule_cfg = WS_DEFAULT_RULE;
  52 enum branch_track git_branch_track = BRANCH_TRACK_REMOTE;
  53 enum rebase_setup_type autorebase = AUTOREBASE_NEVER;
  54 enum push_default_type push_default = PUSH_DEFAULT_UNSPECIFIED;
  55 #ifndef OBJECT_CREATION_MODE
  56 #define OBJECT_CREATION_MODE OBJECT_CREATION_USES_HARDLINKS
  57 #endif
  58 enum object_creation_mode object_creation_mode = OBJECT_CREATION_MODE;
  59 char *notes_ref_name;
  60 int grafts_replace_parents = 1;
  61 int core_apply_sparse_checkout;
  62 int merge_log_config = -1;
  63 int precomposed_unicode = -1; /* see probe_utf8_pathname_composition() */
  64 struct startup_info *startup_info;
  65 unsigned long pack_size_limit_cfg;
  66
  67 #ifndef PROTECT_HFS_DEFAULT
  68 #define PROTECT_HFS_DEFAULT 0
  69 #endif
  70 int protect_hfs = PROTECT_HFS_DEFAULT;
  71
  72 #ifndef PROTECT_NTFS_DEFAULT
  73 #define PROTECT_NTFS_DEFAULT 0
  74 #endif
  75 int protect_ntfs = PROTECT_NTFS_DEFAULT;
  76
  77 /*
  78  * The character that begins a commented line in user-editable file
  79  * that is subject to stripspace.
  80  */
  81 char comment_line_char = '#';
  82
  83 /* Parallel index stat data preload? */
  84 int core_preload_index = 0;
  85
  86 /* This is set by setup_git_dir_gently() and/or git_default_config() */
  87 char *git_work_tree_cfg;
  88 static char *work_tree;
  89
  90 static const char *namespace;
  91 static size_t namespace_len;
  92
  93 static const char *git_dir;
  94 static char *git_object_dir, *git_index_file, *git_graft_file;
  95
  96 /*
  97  * Repository-local GIT_* environment variables; see cache.h for details.
  98  */
  99 const char * const local_repo_env[] = {
 100         ALTERNATE_DB_ENVIRONMENT,
 101         CONFIG_ENVIRONMENT,
 102         CONFIG_DATA_ENVIRONMENT,
 103         DB_ENVIRONMENT,
 104         GIT_DIR_ENVIRONMENT,
 105         GIT_WORK_TREE_ENVIRONMENT,
 106         GIT_IMPLICIT_WORK_TREE_ENVIRONMENT,
 107         GRAFT_ENVIRONMENT,
 108         INDEX_ENVIRONMENT,
 109         NO_REPLACE_OBJECTS_ENVIRONMENT,
 110         GIT_PREFIX_ENVIRONMENT,
 111         GIT_SHALLOW_FILE_ENVIRONMENT,
 112         NULL
 113 };
 114
 115 static char *expand_namespace(const char *raw_namespace)
 116 {
 117         struct strbuf buf = STRBUF_INIT;
 118         struct strbuf **components, **c;
 119
 120         if (!raw_namespace || !*raw_namespace)
 121                 return xstrdup("");
 122
 123         strbuf_addstr(&buf, raw_namespace);
 124         components = strbuf_split(&buf, '/');
 125         strbuf_reset(&buf);
 126         for (c = components; *c; c++)
 127                 if (strcmp((*c)->buf, "/") != 0)
 128                         strbuf_addf(&buf, "refs/namespaces/%s", (*c)->buf);
 129         strbuf_list_free(components);
 130         if (check_refname_format(buf.buf, 0))
 131                 die("bad git namespace path \"%s\"", raw_namespace);
 132         strbuf_addch(&buf, '/');
 133         return strbuf_detach(&buf, NULL);
 134 }
 135
 136 static void setup_git_env(void)
 137 {
 138         const char *gitfile;
 139         const char *shallow_file;
 140
 141         git_dir = getenv(GIT_DIR_ENVIRONMENT);
 142         if (!git_dir)
 143                 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
 144         gitfile = read_gitfile(git_dir);
 145         git_dir = xstrdup(gitfile ? gitfile : git_dir);
 146         git_object_dir = getenv(DB_ENVIRONMENT);
 147         if (!git_object_dir) {
 148                 git_object_dir = xmalloc(strlen(git_dir) + 9);
 149                 sprintf(git_object_dir, "%s/objects", git_dir);
 150         }
 151         git_index_file = getenv(INDEX_ENVIRONMENT);
 152         if (!git_index_file) {
 153                 git_index_file = xmalloc(strlen(git_dir) + 7);
 154                 sprintf(git_index_file, "%s/index", git_dir);
 155         }
 156         git_graft_file = getenv(GRAFT_ENVIRONMENT);
 157         if (!git_graft_file)
 158                 git_graft_file = git_pathdup("info/grafts");
 159         if (getenv(NO_REPLACE_OBJECTS_ENVIRONMENT))
 160                 check_replace_refs = 0;
 161         namespace = expand_namespace(getenv(GIT_NAMESPACE_ENVIRONMENT));
 162         namespace_len = strlen(namespace);
 163         shallow_file = getenv(GIT_SHALLOW_FILE_ENVIRONMENT);
 164         if (shallow_file)
 165                 set_alternate_shallow_file(shallow_file, 0);
 166 }
 167
 168 int is_bare_repository(void)
 169 {
 170         /* if core.bare is not 'false', let's see if there is a work tree */
 171         return is_bare_repository_cfg && !get_git_work_tree();
 172 }
 173
 174 const char *get_git_dir(void)
 175 {
 176         if (!git_dir)
 177                 setup_git_env();
 178         return git_dir;
 179 }
 180
 181 const char *get_git_namespace(void)
 182 {
 183         if (!namespace)
 184                 setup_git_env();
 185         return namespace;
 186 }
 187
 188 const char *strip_namespace(const char *namespaced_ref)
 189 {
 190         if (!starts_with(namespaced_ref, get_git_namespace()))
 191                 return NULL;
 192         return namespaced_ref + namespace_len;
 193 }
 194
 195 static int git_work_tree_initialized;
 196
 197 /*
 198  * Note.  This works only before you used a work tree.  This was added
 199  * primarily to support git-clone to work in a new repository it just
 200  * created, and is not meant to flip between different work trees.
 201  */
 202 void set_git_work_tree(const char *new_work_tree)
 203 {
 204         if (git_work_tree_initialized) {
 205                 new_work_tree = real_path(new_work_tree);
 206                 if (strcmp(new_work_tree, work_tree))
 207                         die("internal error: work tree has already been set\n"
 208                             "Current worktree: %s\nNew worktree: %s",
 209                             work_tree, new_work_tree);
 210                 return;
 211         }
 212         git_work_tree_initialized = 1;
 213         work_tree = xstrdup(real_path(new_work_tree));
 214         if (setenv(GIT_WORK_TREE_ENVIRONMENT, work_tree, 1))
 215                 die("could not set GIT_WORK_TREE to '%s'", work_tree);
 216 }
 217
 218 const char *get_git_work_tree(void)
 219 {
 220         return work_tree;
 221 }
 222
 223 char *get_object_directory(void)
 224 {
 225         if (!git_object_dir)
 226                 setup_git_env();
 227         return git_object_dir;
 228 }
 229
 230 int odb_mkstemp(char *template, size_t limit, const char *pattern)
 231 {
 232         int fd;
 233         /*
 234          * we let the umask do its job, don't try to be more
 235          * restrictive except to remove write permission.
 236          */
 237         int mode = 0444;
 238         snprintf(template, limit, "%s/%s",
 239                  get_object_directory(), pattern);
 240         fd = git_mkstemp_mode(template, mode);
 241         if (0 <= fd)
 242                 return fd;
 243
 244         /* slow path */
 245         /* some mkstemp implementations erase template on failure */
 246         snprintf(template, limit, "%s/%s",
 247                  get_object_directory(), pattern);
 248         safe_create_leading_directories(template);
 249         return xmkstemp_mode(template, mode);
 250 }
 251
 252 int odb_pack_keep(char *name, size_t namesz, const unsigned char *sha1)
 253 {
 254         int fd;
 255
 256         snprintf(name, namesz, "%s/pack/pack-%s.keep",
 257                  get_object_directory(), sha1_to_hex(sha1));
 258         fd = open(name, O_RDWR|O_CREAT|O_EXCL, 0600);
 259         if (0 <= fd)
 260                 return fd;
 261
 262         /* slow path */
 263         safe_create_leading_directories(name);
 264         return open(name, O_RDWR|O_CREAT|O_EXCL, 0600);
 265 }
 266
 267 char *get_index_file(void)
 268 {
 269         if (!git_index_file)
 270                 setup_git_env();
 271         return git_index_file;
 272 }
 273
 274 char *get_graft_file(void)
 275 {
 276         if (!git_graft_file)
 277                 setup_git_env();
 278         return git_graft_file;
 279 }
 280
 281 int set_git_dir(const char *path)
 282 {
 283         if (setenv(GIT_DIR_ENVIRONMENT, path, 1))
 284                 return error("Could not set GIT_DIR to '%s'", path);
 285         setup_git_env();
 286         return 0;
 287 }
 288
 289 const char *get_log_output_encoding(void)
 290 {
 291         return git_log_output_encoding ? git_log_output_encoding
 292                 : get_commit_output_encoding();
 293 }
 294
 295 const char *get_commit_output_encoding(void)
 296 {
 297         return git_commit_encoding ? git_commit_encoding : "UTF-8";
 298 }