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