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