builtin-init-db.c

   1 /*
   2  * GIT - The information manager from hell
   3  *
   4  * Copyright (C) Linus Torvalds, 2005
   5  */
   6 #include "cache.h"
   7 #include "builtin.h"
   8 #include "exec_cmd.h"
   9
  10 #ifndef DEFAULT_GIT_TEMPLATE_DIR
  11 #define DEFAULT_GIT_TEMPLATE_DIR "/usr/share/git-core/templates"
  12 #endif
  13
  14 #ifdef NO_TRUSTABLE_FILEMODE
  15 #define TEST_FILEMODE 0
  16 #else
  17 #define TEST_FILEMODE 1
  18 #endif
  19
  20 static void safe_create_dir(const char *dir, int share)
  21 {
  22         if (mkdir(dir, 0777) < 0) {
  23                 if (errno != EEXIST) {
  24                         perror(dir);
  25                         exit(1);
  26                 }
  27         }
  28         else if (share && adjust_shared_perm(dir))
  29                 die("Could not make %s writable by group\n", dir);
  30 }
  31
  32 static int copy_file(const char *dst, const char *src, int mode)
  33 {
  34         int fdi, fdo, status;
  35
  36         mode = (mode & 0111) ? 0777 : 0666;
  37         if ((fdi = open(src, O_RDONLY)) < 0)
  38                 return fdi;
  39         if ((fdo = open(dst, O_WRONLY | O_CREAT | O_EXCL, mode)) < 0) {
  40                 close(fdi);
  41                 return fdo;
  42         }
  43         status = copy_fd(fdi, fdo);
  44         if (close(fdo) != 0)
  45                 return error("%s: write error: %s", dst, strerror(errno));
  46
  47         if (!status && adjust_shared_perm(dst))
  48                 return -1;
  49
  50         return status;
  51 }
  52
  53 static void copy_templates_1(char *path, int baselen,
  54                              char *template, int template_baselen,
  55                              DIR *dir)
  56 {
  57         struct dirent *de;
  58
  59         /* Note: if ".git/hooks" file exists in the repository being
  60          * re-initialized, /etc/core-git/templates/hooks/update would
  61          * cause git-init to fail here.  I think this is sane but
  62          * it means that the set of templates we ship by default, along
  63          * with the way the namespace under .git/ is organized, should
  64          * be really carefully chosen.
  65          */
  66         safe_create_dir(path, 1);
  67         while ((de = readdir(dir)) != NULL) {
  68                 struct stat st_git, st_template;
  69                 int namelen;
  70                 int exists = 0;
  71
  72                 if (de->d_name[0] == '.')
  73                         continue;
  74                 namelen = strlen(de->d_name);
  75                 if ((PATH_MAX <= baselen + namelen) ||
  76                     (PATH_MAX <= template_baselen + namelen))
  77                         die("insanely long template name %s", de->d_name);
  78                 memcpy(path + baselen, de->d_name, namelen+1);
  79                 memcpy(template + template_baselen, de->d_name, namelen+1);
  80                 if (lstat(path, &st_git)) {
  81                         if (errno != ENOENT)
  82                                 die("cannot stat %s", path);
  83                 }
  84                 else
  85                         exists = 1;
  86
  87                 if (lstat(template, &st_template))
  88                         die("cannot stat template %s", template);
  89
  90                 if (S_ISDIR(st_template.st_mode)) {
  91                         DIR *subdir = opendir(template);
  92                         int baselen_sub = baselen + namelen;
  93                         int template_baselen_sub = template_baselen + namelen;
  94                         if (!subdir)
  95                                 die("cannot opendir %s", template);
  96                         path[baselen_sub++] =
  97                                 template[template_baselen_sub++] = '/';
  98                         path[baselen_sub] =
  99                                 template[template_baselen_sub] = 0;
 100                         copy_templates_1(path, baselen_sub,
 101                                          template, template_baselen_sub,
 102                                          subdir);
 103                         closedir(subdir);
 104                 }
 105                 else if (exists)
 106                         continue;
 107                 else if (S_ISLNK(st_template.st_mode)) {
 108                         char lnk[256];
 109                         int len;
 110                         len = readlink(template, lnk, sizeof(lnk));
 111                         if (len < 0)
 112                                 die("cannot readlink %s", template);
 113                         if (sizeof(lnk) <= len)
 114                                 die("insanely long symlink %s", template);
 115                         lnk[len] = 0;
 116                         if (symlink(lnk, path))
 117                                 die("cannot symlink %s %s", lnk, path);
 118                 }
 119                 else if (S_ISREG(st_template.st_mode)) {
 120                         if (copy_file(path, template, st_template.st_mode))
 121                                 die("cannot copy %s to %s", template, path);
 122                 }
 123                 else
 124                         error("ignoring template %s", template);
 125         }
 126 }
 127
 128 static void copy_templates(const char *git_dir, int len, const char *template_dir)
 129 {
 130         char path[PATH_MAX];
 131         char template_path[PATH_MAX];
 132         int template_len;
 133         DIR *dir;
 134
 135         if (!template_dir)
 136                 template_dir = getenv(TEMPLATE_DIR_ENVIRONMENT);
 137         if (!template_dir) {
 138                 /*
 139                  * if the hard-coded template is relative, it is
 140                  * interpreted relative to the exec_dir
 141                  */
 142                 template_dir = DEFAULT_GIT_TEMPLATE_DIR;
 143                 if (template_dir[0] != '/' && template_dir[1] != ':') {
 144                         const char *exec_path = git_exec_path();
 145                         template_dir = prefix_path(exec_path, strlen(exec_path),
 146                                                    template_dir);
 147                 }
 148         }
 149         strcpy(template_path, template_dir);
 150         template_len = strlen(template_path);
 151         if (template_path[template_len-1] != '/') {
 152                 template_path[template_len++] = '/';
 153                 template_path[template_len] = 0;
 154         }
 155         dir = opendir(template_path);
 156         if (!dir) {
 157                 fprintf(stderr, "warning: templates not found %s\n",
 158                         template_dir);
 159                 return;
 160         }
 161
 162         /* Make sure that template is from the correct vintage */
 163         strcpy(template_path + template_len, "config");
 164         repository_format_version = 0;
 165         git_config_from_file(check_repository_format_version,
 166                              template_path);
 167         template_path[template_len] = 0;
 168
 169         if (repository_format_version &&
 170             repository_format_version != GIT_REPO_VERSION) {
 171                 fprintf(stderr, "warning: not copying templates of "
 172                         "a wrong format version %d from '%s'\n",
 173                         repository_format_version,
 174                         template_dir);
 175                 closedir(dir);
 176                 return;
 177         }
 178
 179         memcpy(path, git_dir, len);
 180         path[len] = 0;
 181         copy_templates_1(path, len,
 182                          template_path, template_len,
 183                          dir);
 184         closedir(dir);
 185 }
 186
 187 /*
 188  * Get the full path to the working tree specified in $GIT_WORK_TREE
 189  * or NULL if no working tree is specified.
 190  */
 191 static const char *get_work_tree(void)
 192 {
 193         const char *git_work_tree;
 194         char cwd[PATH_MAX];
 195         static char worktree[PATH_MAX];
 196
 197         git_work_tree = getenv(GIT_WORK_TREE_ENVIRONMENT);
 198         if (!git_work_tree)
 199                 return NULL;
 200         if (!getcwd(cwd, sizeof(cwd)))
 201                 die("Unable to read current working directory");
 202         if (chdir(git_work_tree))
 203                 die("Cannot change directory to specified working tree '%s'",
 204                         git_work_tree);
 205         if (git_work_tree[0] != '/') {
 206                 if (!getcwd(worktree, sizeof(worktree)))
 207                         die("Unable to read current working directory");
 208                 git_work_tree = worktree;
 209         }
 210         if (chdir(cwd))
 211                 die("Cannot come back to cwd");
 212         return git_work_tree;
 213 }
 214
 215 static int create_default_files(const char *git_dir, const char *git_work_tree,
 216         const char *template_path)
 217 {
 218         unsigned len = strlen(git_dir);
 219         static char path[PATH_MAX];
 220         unsigned char sha1[20];
 221         struct stat st1;
 222         char repo_version_string[10];
 223         int reinit;
 224         int filemode;
 225
 226         if (len > sizeof(path)-50)
 227                 die("insane git directory %s", git_dir);
 228         memcpy(path, git_dir, len);
 229
 230         if (len && path[len-1] != '/')
 231                 path[len++] = '/';
 232
 233         /*
 234          * Create .git/refs/{heads,tags}
 235          */
 236         strcpy(path + len, "refs");
 237         safe_create_dir(path, 1);
 238         strcpy(path + len, "refs/heads");
 239         safe_create_dir(path, 1);
 240         strcpy(path + len, "refs/tags");
 241         safe_create_dir(path, 1);
 242
 243         /* First copy the templates -- we might have the default
 244          * config file there, in which case we would want to read
 245          * from it after installing.
 246          */
 247         path[len] = 0;
 248         copy_templates(path, len, template_path);
 249
 250         git_config(git_default_config);
 251
 252         /*
 253          * We would have created the above under user's umask -- under
 254          * shared-repository settings, we would need to fix them up.
 255          */
 256         if (shared_repository) {
 257                 path[len] = 0;
 258                 adjust_shared_perm(path);
 259                 strcpy(path + len, "refs");
 260                 adjust_shared_perm(path);
 261                 strcpy(path + len, "refs/heads");
 262                 adjust_shared_perm(path);
 263                 strcpy(path + len, "refs/tags");
 264                 adjust_shared_perm(path);
 265         }
 266
 267         /*
 268          * Create the default symlink from ".git/HEAD" to the "master"
 269          * branch, if it does not exist yet.
 270          */
 271         strcpy(path + len, "HEAD");
 272         reinit = !read_ref("HEAD", sha1);
 273         if (!reinit) {
 274                 if (create_symref("HEAD", "refs/heads/master", NULL) < 0)
 275                         exit(1);
 276         }
 277
 278         /* This forces creation of new config file */
 279         sprintf(repo_version_string, "%d", GIT_REPO_VERSION);
 280         git_config_set("core.repositoryformatversion", repo_version_string);
 281
 282         path[len] = 0;
 283         strcpy(path + len, "config");
 284
 285         /* Check filemode trustability */
 286         filemode = TEST_FILEMODE;
 287         if (TEST_FILEMODE && !lstat(path, &st1)) {
 288                 struct stat st2;
 289                 filemode = (!chmod(path, st1.st_mode ^ S_IXUSR) &&
 290                                 !lstat(path, &st2) &&
 291                                 st1.st_mode != st2.st_mode);
 292         }
 293         git_config_set("core.filemode", filemode ? "true" : "false");
 294
 295         if (is_bare_repository() && !git_work_tree) {
 296                 git_config_set("core.bare", "true");
 297         }
 298         else {
 299                 git_config_set("core.bare", "false");
 300                 /* allow template config file to override the default */
 301                 if (log_all_ref_updates == -1)
 302                     git_config_set("core.logallrefupdates", "true");
 303                 if (git_work_tree)
 304                         git_config_set("core.worktree", git_work_tree);
 305         }
 306         return reinit;
 307 }
 308
 309 static const char init_db_usage[] =
 310 "git-init [-q | --quiet] [--template=<template-directory>] [--shared]";
 311
 312 /*
 313  * If you want to, you can share the DB area with any number of branches.
 314  * That has advantages: you can save space by sharing all the SHA1 objects.
 315  * On the other hand, it might just make lookup slower and messier. You
 316  * be the judge.  The default case is to have one DB per managed directory.
 317  */
 318 int cmd_init_db(int argc, const char **argv, const char *prefix)
 319 {
 320         const char *git_dir;
 321         const char *git_work_tree;
 322         const char *sha1_dir;
 323         const char *template_dir = NULL;
 324         char *path;
 325         int len, i, reinit;
 326         int quiet = 0;
 327
 328         for (i = 1; i < argc; i++, argv++) {
 329                 const char *arg = argv[1];
 330                 if (!prefixcmp(arg, "--template="))
 331                         template_dir = arg+11;
 332                 else if (!strcmp(arg, "--shared"))
 333                         shared_repository = PERM_GROUP;
 334                 else if (!prefixcmp(arg, "--shared="))
 335                         shared_repository = git_config_perm("arg", arg+9);
 336                 else if (!strcmp(arg, "-q") || !strcmp(arg, "--quiet"))
 337                         quiet = 1;
 338                 else
 339                         usage(init_db_usage);
 340         }
 341
 342         git_work_tree = get_work_tree();
 343
 344         /*
 345          * Set up the default .git directory contents
 346          */
 347         git_dir = get_git_dir();
 348         safe_create_dir(git_dir, 0);
 349
 350         /* Check to see if the repository version is right.
 351          * Note that a newly created repository does not have
 352          * config file, so this will not fail.  What we are catching
 353          * is an attempt to reinitialize new repository with an old tool.
 354          */
 355         check_repository_format();
 356
 357         reinit = create_default_files(git_dir, git_work_tree, template_dir);
 358
 359         /*
 360          * And set up the object store.
 361          */
 362         sha1_dir = get_object_directory();
 363         len = strlen(sha1_dir);
 364         path = xmalloc(len + 40);
 365         memcpy(path, sha1_dir, len);
 366
 367         safe_create_dir(sha1_dir, 1);
 368         strcpy(path+len, "/pack");
 369         safe_create_dir(path, 1);
 370         strcpy(path+len, "/info");
 371         safe_create_dir(path, 1);
 372
 373         if (shared_repository) {
 374                 char buf[10];
 375                 /* We do not spell "group" and such, so that
 376                  * the configuration can be read by older version
 377                  * of git.
 378                  */
 379                 sprintf(buf, "%d", shared_repository);
 380                 git_config_set("core.sharedrepository", buf);
 381                 git_config_set("receive.denyNonFastforwards", "true");
 382         }
 383
 384         if (!quiet)
 385                 printf("%s%s Git repository in %s/\n",
 386                        reinit ? "Reinitialized existing" : "Initialized empty",
 387                        shared_repository ? " shared" : "",
 388                        git_dir);
 389
 390         return 0;
 391 }