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