builtin/init-db.c

   1 /*
   2  * GIT - The information manager from hell
   3  *
   4  * Copyright (C) Linus Torvalds, 2005
   5  */
   6 #include "builtin.h"
   7 #include "abspath.h"
   8 #include "config.h"
   9 #include "environment.h"
  10 #include "gettext.h"
  11 #include "object-file.h"
  12 #include "parse-options.h"
  13 #include "path.h"
  14 #include "setup.h"
  15 #include "strbuf.h"
  16
  17 static int guess_repository_type(const char *git_dir)
  18 {
  19         const char *slash;
  20         char *cwd;
  21         int cwd_is_git_dir;
  22
  23         /*
  24          * "GIT_DIR=. git init" is always bare.
  25          * "GIT_DIR=`pwd` git init" too.
  26          */
  27         if (!strcmp(".", git_dir))
  28                 return 1;
  29         cwd = xgetcwd();
  30         cwd_is_git_dir = !strcmp(git_dir, cwd);
  31         free(cwd);
  32         if (cwd_is_git_dir)
  33                 return 1;
  34         /*
  35          * "GIT_DIR=.git or GIT_DIR=something/.git is usually not.
  36          */
  37         if (!strcmp(git_dir, ".git"))
  38                 return 0;
  39         slash = strrchr(git_dir, '/');
  40         if (slash && !strcmp(slash, "/.git"))
  41                 return 0;
  42
  43         /*
  44          * Otherwise it is often bare.  At this point
  45          * we are just guessing.
  46          */
  47         return 1;
  48 }
  49
  50 static int shared_callback(const struct option *opt, const char *arg, int unset)
  51 {
  52         BUG_ON_OPT_NEG(unset);
  53         *((int *) opt->value) = (arg) ? git_config_perm("arg", arg) : PERM_GROUP;
  54         return 0;
  55 }
  56
  57 static const char *const init_db_usage[] = {
  58         N_("git init [-q | --quiet] [--bare] [--template=<template-directory>]\n"
  59            "         [--separate-git-dir <git-dir>] [--object-format=<format>]\n"
  60            "         [-b <branch-name> | --initial-branch=<branch-name>]\n"
  61            "         [--shared[=<permissions>]] [<directory>]"),
  62         NULL
  63 };
  64
  65 /*
  66  * If you want to, you can share the DB area with any number of branches.
  67  * That has advantages: you can save space by sharing all the SHA1 objects.
  68  * On the other hand, it might just make lookup slower and messier. You
  69  * be the judge.  The default case is to have one DB per managed directory.
  70  */
  71 int cmd_init_db(int argc, const char **argv, const char *prefix)
  72 {
  73         const char *git_dir;
  74         const char *real_git_dir = NULL;
  75         const char *work_tree;
  76         const char *template_dir = NULL;
  77         unsigned int flags = 0;
  78         const char *object_format = NULL;
  79         const char *initial_branch = NULL;
  80         int hash_algo = GIT_HASH_UNKNOWN;
  81         int init_shared_repository = -1;
  82         const struct option init_db_options[] = {
  83                 OPT_STRING(0, "template", &template_dir, N_("template-directory"),
  84                                 N_("directory from which templates will be used")),
  85                 OPT_SET_INT(0, "bare", &is_bare_repository_cfg,
  86                                 N_("create a bare repository"), 1),
  87                 { OPTION_CALLBACK, 0, "shared", &init_shared_repository,
  88                         N_("permissions"),
  89                         N_("specify that the git repository is to be shared amongst several users"),
  90                         PARSE_OPT_OPTARG | PARSE_OPT_NONEG, shared_callback, 0},
  91                 OPT_BIT('q', "quiet", &flags, N_("be quiet"), INIT_DB_QUIET),
  92                 OPT_STRING(0, "separate-git-dir", &real_git_dir, N_("gitdir"),
  93                            N_("separate git dir from working tree")),
  94                 OPT_STRING('b', "initial-branch", &initial_branch, N_("name"),
  95                            N_("override the name of the initial branch")),
  96                 OPT_STRING(0, "object-format", &object_format, N_("hash"),
  97                            N_("specify the hash algorithm to use")),
  98                 OPT_END()
  99         };
 100
 101         argc = parse_options(argc, argv, prefix, init_db_options, init_db_usage, 0);
 102
 103         if (real_git_dir && is_bare_repository_cfg == 1)
 104                 die(_("options '%s' and '%s' cannot be used together"), "--separate-git-dir", "--bare");
 105
 106         if (real_git_dir && !is_absolute_path(real_git_dir))
 107                 real_git_dir = real_pathdup(real_git_dir, 1);
 108
 109         if (template_dir && *template_dir && !is_absolute_path(template_dir)) {
 110                 template_dir = absolute_pathdup(template_dir);
 111                 UNLEAK(template_dir);
 112         }
 113
 114         if (argc == 1) {
 115                 int mkdir_tried = 0;
 116         retry:
 117                 if (chdir(argv[0]) < 0) {
 118                         if (!mkdir_tried) {
 119                                 int saved;
 120                                 /*
 121                                  * At this point we haven't read any configuration,
 122                                  * and we know shared_repository should always be 0;
 123                                  * but just in case we play safe.
 124                                  */
 125                                 saved = get_shared_repository();
 126                                 set_shared_repository(0);
 127                                 switch (safe_create_leading_directories_const(argv[0])) {
 128                                 case SCLD_OK:
 129                                 case SCLD_PERMS:
 130                                         break;
 131                                 case SCLD_EXISTS:
 132                                         errno = EEXIST;
 133                                         /* fallthru */
 134                                 default:
 135                                         die_errno(_("cannot mkdir %s"), argv[0]);
 136                                         break;
 137                                 }
 138                                 set_shared_repository(saved);
 139                                 if (mkdir(argv[0], 0777) < 0)
 140                                         die_errno(_("cannot mkdir %s"), argv[0]);
 141                                 mkdir_tried = 1;
 142                                 goto retry;
 143                         }
 144                         die_errno(_("cannot chdir to %s"), argv[0]);
 145                 }
 146         } else if (0 < argc) {
 147                 usage(init_db_usage[0]);
 148         }
 149         if (is_bare_repository_cfg == 1) {
 150                 char *cwd = xgetcwd();
 151                 setenv(GIT_DIR_ENVIRONMENT, cwd, argc > 0);
 152                 free(cwd);
 153         }
 154
 155         if (object_format) {
 156                 hash_algo = hash_algo_by_name(object_format);
 157                 if (hash_algo == GIT_HASH_UNKNOWN)
 158                         die(_("unknown hash algorithm '%s'"), object_format);
 159         }
 160
 161         if (init_shared_repository != -1)
 162                 set_shared_repository(init_shared_repository);
 163
 164         /*
 165          * GIT_WORK_TREE makes sense only in conjunction with GIT_DIR
 166          * without --bare.  Catch the error early.
 167          */
 168         git_dir = xstrdup_or_null(getenv(GIT_DIR_ENVIRONMENT));
 169         work_tree = xstrdup_or_null(getenv(GIT_WORK_TREE_ENVIRONMENT));
 170         if ((!git_dir || is_bare_repository_cfg == 1) && work_tree)
 171                 die(_("%s (or --work-tree=<directory>) not allowed without "
 172                           "specifying %s (or --git-dir=<directory>)"),
 173                     GIT_WORK_TREE_ENVIRONMENT,
 174                     GIT_DIR_ENVIRONMENT);
 175
 176         /*
 177          * Set up the default .git directory contents
 178          */
 179         if (!git_dir)
 180                 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
 181
 182         /*
 183          * When --separate-git-dir is used inside a linked worktree, take
 184          * care to ensure that the common .git/ directory is relocated, not
 185          * the worktree-specific .git/worktrees/<id>/ directory.
 186          */
 187         if (real_git_dir) {
 188                 int err;
 189                 const char *p;
 190                 struct strbuf sb = STRBUF_INIT;
 191
 192                 p = read_gitfile_gently(git_dir, &err);
 193                 if (p && get_common_dir(&sb, p)) {
 194                         struct strbuf mainwt = STRBUF_INIT;
 195
 196                         strbuf_addbuf(&mainwt, &sb);
 197                         strbuf_strip_suffix(&mainwt, "/.git");
 198                         if (chdir(mainwt.buf) < 0)
 199                                 die_errno(_("cannot chdir to %s"), mainwt.buf);
 200                         strbuf_release(&mainwt);
 201                         git_dir = strbuf_detach(&sb, NULL);
 202                 }
 203                 strbuf_release(&sb);
 204         }
 205
 206         if (is_bare_repository_cfg < 0)
 207                 is_bare_repository_cfg = guess_repository_type(git_dir);
 208
 209         if (!is_bare_repository_cfg) {
 210                 const char *git_dir_parent = strrchr(git_dir, '/');
 211                 if (git_dir_parent) {
 212                         char *rel = xstrndup(git_dir, git_dir_parent - git_dir);
 213                         git_work_tree_cfg = real_pathdup(rel, 1);
 214                         free(rel);
 215                 }
 216                 if (!git_work_tree_cfg)
 217                         git_work_tree_cfg = xgetcwd();
 218                 if (work_tree)
 219                         set_git_work_tree(work_tree);
 220                 else
 221                         set_git_work_tree(git_work_tree_cfg);
 222                 if (access(get_git_work_tree(), X_OK))
 223                         die_errno (_("Cannot access work tree '%s'"),
 224                                    get_git_work_tree());
 225         }
 226         else {
 227                 if (real_git_dir)
 228                         die(_("--separate-git-dir incompatible with bare repository"));
 229                 if (work_tree)
 230                         set_git_work_tree(work_tree);
 231         }
 232
 233         UNLEAK(real_git_dir);
 234         UNLEAK(git_dir);
 235         UNLEAK(work_tree);
 236
 237         flags |= INIT_DB_EXIST_OK;
 238         return init_db(git_dir, real_git_dir, template_dir, hash_algo,
 239                        initial_branch, init_shared_repository, flags);
 240 }