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