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