environment.con commit setup_git_env: avoid blind fall-back to ".git" (b1ef400)
   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
  15int trust_executable_bit = 1;
  16int trust_ctime = 1;
  17int check_stat = 1;
  18int has_symlinks = 1;
  19int minimum_abbrev = 4, default_abbrev = 7;
  20int ignore_case;
  21int assume_unchanged;
  22int prefer_symlink_refs;
  23int is_bare_repository_cfg = -1; /* unspecified */
  24int log_all_ref_updates = -1; /* unspecified */
  25int warn_ambiguous_refs = 1;
  26int warn_on_object_refname_ambiguity = 1;
  27int ref_paranoia = -1;
  28int repository_format_precious_objects;
  29const char *git_commit_encoding;
  30const char *git_log_output_encoding;
  31const char *apply_default_whitespace;
  32const char *apply_default_ignorewhitespace;
  33const char *git_attributes_file;
  34const char *git_hooks_path;
  35int zlib_compression_level = Z_BEST_SPEED;
  36int core_compression_level;
  37int core_compression_seen;
  38int fsync_object_files;
  39size_t packed_git_window_size = DEFAULT_PACKED_GIT_WINDOW_SIZE;
  40size_t packed_git_limit = DEFAULT_PACKED_GIT_LIMIT;
  41size_t delta_base_cache_limit = 96 * 1024 * 1024;
  42unsigned long big_file_threshold = 512 * 1024 * 1024;
  43int pager_use_color = 1;
  44const char *editor_program;
  45const char *askpass_program;
  46const char *excludes_file;
  47enum auto_crlf auto_crlf = AUTO_CRLF_FALSE;
  48int check_replace_refs = 1;
  49char *git_replace_ref_base;
  50enum eol core_eol = EOL_UNSET;
  51enum safe_crlf safe_crlf = SAFE_CRLF_WARN;
  52unsigned whitespace_rule_cfg = WS_DEFAULT_RULE;
  53enum branch_track git_branch_track = BRANCH_TRACK_REMOTE;
  54enum rebase_setup_type autorebase = AUTOREBASE_NEVER;
  55enum push_default_type push_default = PUSH_DEFAULT_UNSPECIFIED;
  56#ifndef OBJECT_CREATION_MODE
  57#define OBJECT_CREATION_MODE OBJECT_CREATION_USES_HARDLINKS
  58#endif
  59enum object_creation_mode object_creation_mode = OBJECT_CREATION_MODE;
  60char *notes_ref_name;
  61int grafts_replace_parents = 1;
  62int core_apply_sparse_checkout;
  63int merge_log_config = -1;
  64int precomposed_unicode = -1; /* see probe_utf8_pathname_composition() */
  65unsigned long pack_size_limit_cfg;
  66enum hide_dotfiles_type hide_dotfiles = HIDE_DOTFILES_DOTGITONLY;
  67
  68#ifndef PROTECT_HFS_DEFAULT
  69#define PROTECT_HFS_DEFAULT 0
  70#endif
  71int protect_hfs = PROTECT_HFS_DEFAULT;
  72
  73#ifndef PROTECT_NTFS_DEFAULT
  74#define PROTECT_NTFS_DEFAULT 0
  75#endif
  76int protect_ntfs = PROTECT_NTFS_DEFAULT;
  77
  78/*
  79 * The character that begins a commented line in user-editable file
  80 * that is subject to stripspace.
  81 */
  82char comment_line_char = '#';
  83int auto_comment_line_char;
  84
  85/* Parallel index stat data preload? */
  86int core_preload_index = 1;
  87
  88/*
  89 * This is a hack for test programs like test-dump-untracked-cache to
  90 * ensure that they do not modify the untracked cache when reading it.
  91 * Do not use it otherwise!
  92 */
  93int ignore_untracked_cache_config;
  94
  95/* This is set by setup_git_dir_gently() and/or git_default_config() */
  96char *git_work_tree_cfg;
  97static char *work_tree;
  98
  99static const char *namespace;
 100static size_t namespace_len;
 101
 102static const char *super_prefix;
 103
 104static const char *git_dir, *git_common_dir;
 105static char *git_object_dir, *git_index_file, *git_graft_file;
 106int git_db_env, git_index_env, git_graft_env, git_common_dir_env;
 107
 108/*
 109 * Repository-local GIT_* environment variables; see cache.h for details.
 110 */
 111const char * const local_repo_env[] = {
 112        ALTERNATE_DB_ENVIRONMENT,
 113        CONFIG_ENVIRONMENT,
 114        CONFIG_DATA_ENVIRONMENT,
 115        DB_ENVIRONMENT,
 116        GIT_DIR_ENVIRONMENT,
 117        GIT_WORK_TREE_ENVIRONMENT,
 118        GIT_IMPLICIT_WORK_TREE_ENVIRONMENT,
 119        GRAFT_ENVIRONMENT,
 120        INDEX_ENVIRONMENT,
 121        NO_REPLACE_OBJECTS_ENVIRONMENT,
 122        GIT_REPLACE_REF_BASE_ENVIRONMENT,
 123        GIT_PREFIX_ENVIRONMENT,
 124        GIT_SUPER_PREFIX_ENVIRONMENT,
 125        GIT_SHALLOW_FILE_ENVIRONMENT,
 126        GIT_COMMON_DIR_ENVIRONMENT,
 127        NULL
 128};
 129
 130static char *expand_namespace(const char *raw_namespace)
 131{
 132        struct strbuf buf = STRBUF_INIT;
 133        struct strbuf **components, **c;
 134
 135        if (!raw_namespace || !*raw_namespace)
 136                return xstrdup("");
 137
 138        strbuf_addstr(&buf, raw_namespace);
 139        components = strbuf_split(&buf, '/');
 140        strbuf_reset(&buf);
 141        for (c = components; *c; c++)
 142                if (strcmp((*c)->buf, "/") != 0)
 143                        strbuf_addf(&buf, "refs/namespaces/%s", (*c)->buf);
 144        strbuf_list_free(components);
 145        if (check_refname_format(buf.buf, 0))
 146                die("bad git namespace path \"%s\"", raw_namespace);
 147        strbuf_addch(&buf, '/');
 148        return strbuf_detach(&buf, NULL);
 149}
 150
 151static char *git_path_from_env(const char *envvar, const char *git_dir,
 152                               const char *path, int *fromenv)
 153{
 154        const char *value = getenv(envvar);
 155        if (!value)
 156                return xstrfmt("%s/%s", git_dir, path);
 157        if (fromenv)
 158                *fromenv = 1;
 159        return xstrdup(value);
 160}
 161
 162static void setup_git_env(void)
 163{
 164        struct strbuf sb = STRBUF_INIT;
 165        const char *gitfile;
 166        const char *shallow_file;
 167        const char *replace_ref_base;
 168
 169        git_dir = getenv(GIT_DIR_ENVIRONMENT);
 170        if (!git_dir) {
 171                if (!startup_info->have_repository)
 172                        die("BUG: setup_git_env called without repository");
 173                git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
 174        }
 175        gitfile = read_gitfile(git_dir);
 176        git_dir = xstrdup(gitfile ? gitfile : git_dir);
 177        if (get_common_dir(&sb, git_dir))
 178                git_common_dir_env = 1;
 179        git_common_dir = strbuf_detach(&sb, NULL);
 180        git_object_dir = git_path_from_env(DB_ENVIRONMENT, git_common_dir,
 181                                           "objects", &git_db_env);
 182        git_index_file = git_path_from_env(INDEX_ENVIRONMENT, git_dir,
 183                                           "index", &git_index_env);
 184        git_graft_file = git_path_from_env(GRAFT_ENVIRONMENT, git_common_dir,
 185                                           "info/grafts", &git_graft_env);
 186        if (getenv(NO_REPLACE_OBJECTS_ENVIRONMENT))
 187                check_replace_refs = 0;
 188        replace_ref_base = getenv(GIT_REPLACE_REF_BASE_ENVIRONMENT);
 189        git_replace_ref_base = xstrdup(replace_ref_base ? replace_ref_base
 190                                                          : "refs/replace/");
 191        namespace = expand_namespace(getenv(GIT_NAMESPACE_ENVIRONMENT));
 192        namespace_len = strlen(namespace);
 193        shallow_file = getenv(GIT_SHALLOW_FILE_ENVIRONMENT);
 194        if (shallow_file)
 195                set_alternate_shallow_file(shallow_file, 0);
 196}
 197
 198int is_bare_repository(void)
 199{
 200        /* if core.bare is not 'false', let's see if there is a work tree */
 201        return is_bare_repository_cfg && !get_git_work_tree();
 202}
 203
 204int have_git_dir(void)
 205{
 206        return startup_info->have_repository
 207                || git_dir
 208                || getenv(GIT_DIR_ENVIRONMENT);
 209}
 210
 211const char *get_git_dir(void)
 212{
 213        if (!git_dir)
 214                setup_git_env();
 215        return git_dir;
 216}
 217
 218const char *get_git_common_dir(void)
 219{
 220        return git_common_dir;
 221}
 222
 223const char *get_git_namespace(void)
 224{
 225        if (!namespace)
 226                setup_git_env();
 227        return namespace;
 228}
 229
 230const char *strip_namespace(const char *namespaced_ref)
 231{
 232        if (!starts_with(namespaced_ref, get_git_namespace()))
 233                return NULL;
 234        return namespaced_ref + namespace_len;
 235}
 236
 237const char *get_super_prefix(void)
 238{
 239        static int initialized;
 240        if (!initialized) {
 241                super_prefix = getenv(GIT_SUPER_PREFIX_ENVIRONMENT);
 242                initialized = 1;
 243        }
 244        return super_prefix;
 245}
 246
 247static int git_work_tree_initialized;
 248
 249/*
 250 * Note.  This works only before you used a work tree.  This was added
 251 * primarily to support git-clone to work in a new repository it just
 252 * created, and is not meant to flip between different work trees.
 253 */
 254void set_git_work_tree(const char *new_work_tree)
 255{
 256        if (git_work_tree_initialized) {
 257                new_work_tree = real_path(new_work_tree);
 258                if (strcmp(new_work_tree, work_tree))
 259                        die("internal error: work tree has already been set\n"
 260                            "Current worktree: %s\nNew worktree: %s",
 261                            work_tree, new_work_tree);
 262                return;
 263        }
 264        git_work_tree_initialized = 1;
 265        work_tree = xstrdup(real_path(new_work_tree));
 266}
 267
 268const char *get_git_work_tree(void)
 269{
 270        return work_tree;
 271}
 272
 273char *get_object_directory(void)
 274{
 275        if (!git_object_dir)
 276                setup_git_env();
 277        return git_object_dir;
 278}
 279
 280int odb_mkstemp(char *template, size_t limit, const char *pattern)
 281{
 282        int fd;
 283        /*
 284         * we let the umask do its job, don't try to be more
 285         * restrictive except to remove write permission.
 286         */
 287        int mode = 0444;
 288        snprintf(template, limit, "%s/%s",
 289                 get_object_directory(), pattern);
 290        fd = git_mkstemp_mode(template, mode);
 291        if (0 <= fd)
 292                return fd;
 293
 294        /* slow path */
 295        /* some mkstemp implementations erase template on failure */
 296        snprintf(template, limit, "%s/%s",
 297                 get_object_directory(), pattern);
 298        safe_create_leading_directories(template);
 299        return xmkstemp_mode(template, mode);
 300}
 301
 302int odb_pack_keep(char *name, size_t namesz, const unsigned char *sha1)
 303{
 304        int fd;
 305
 306        snprintf(name, namesz, "%s/pack/pack-%s.keep",
 307                 get_object_directory(), sha1_to_hex(sha1));
 308        fd = open(name, O_RDWR|O_CREAT|O_EXCL, 0600);
 309        if (0 <= fd)
 310                return fd;
 311
 312        /* slow path */
 313        safe_create_leading_directories(name);
 314        return open(name, O_RDWR|O_CREAT|O_EXCL, 0600);
 315}
 316
 317char *get_index_file(void)
 318{
 319        if (!git_index_file)
 320                setup_git_env();
 321        return git_index_file;
 322}
 323
 324char *get_graft_file(void)
 325{
 326        if (!git_graft_file)
 327                setup_git_env();
 328        return git_graft_file;
 329}
 330
 331int set_git_dir(const char *path)
 332{
 333        if (setenv(GIT_DIR_ENVIRONMENT, path, 1))
 334                return error("Could not set GIT_DIR to '%s'", path);
 335        setup_git_env();
 336        return 0;
 337}
 338
 339const char *get_log_output_encoding(void)
 340{
 341        return git_log_output_encoding ? git_log_output_encoding
 342                : get_commit_output_encoding();
 343}
 344
 345const char *get_commit_output_encoding(void)
 346{
 347        return git_commit_encoding ? git_commit_encoding : "UTF-8";
 348}
 349
 350static int the_shared_repository = PERM_UMASK;
 351static int need_shared_repository_from_config = 1;
 352
 353void set_shared_repository(int value)
 354{
 355        the_shared_repository = value;
 356        need_shared_repository_from_config = 0;
 357}
 358
 359int get_shared_repository(void)
 360{
 361        if (need_shared_repository_from_config) {
 362                const char *var = "core.sharedrepository";
 363                const char *value;
 364                if (!git_config_get_value(var, &value))
 365                        the_shared_repository = git_config_perm(var, value);
 366                need_shared_repository_from_config = 0;
 367        }
 368        return the_shared_repository;
 369}
 370
 371void reset_shared_repository(void)
 372{
 373        need_shared_repository_from_config = 1;
 374}