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                         template_dir = DEFAULT_GIT_TEMPLATE_DIR;
 137         }
 138         strcpy(template_path, template_dir);
 139         template_len = strlen(template_path);
 140         if (template_path[template_len-1] != '/') {
 141                 template_path[template_len++] = '/';
 142                 template_path[template_len] = 0;
 143         }
 144         dir = opendir(template_path);
 145         if (!dir) {
 146                 fprintf(stderr, "warning: templates not found %s\n",
 147                         template_dir);
 148                 return;
 149         }
 150
 151         /* Make sure that template is from the correct vintage */
 152         strcpy(template_path + template_len, "config");
 153         repository_format_version = 0;
 154         git_config_from_file(check_repository_format_version,
 155                              template_path);
 156         template_path[template_len] = 0;
 157
 158         if (repository_format_version &&
 159             repository_format_version != GIT_REPO_VERSION) {
 160                 fprintf(stderr, "warning: not copying templates of "
 161                         "a wrong format version %d from '%s'\n",
 162                         repository_format_version,
 163                         template_dir);
 164                 closedir(dir);
 165                 return;
 166         }
 167
 168         memcpy(path, git_dir, len);
 169         path[len] = 0;
 170         copy_templates_1(path, len,
 171                          template_path, template_len,
 172                          dir);
 173         closedir(dir);
 174 }
 175
 176 static int create_default_files(const char *git_dir, const char *template_path)
 177 {
 178         unsigned len = strlen(git_dir);
 179         static char path[PATH_MAX];
 180         unsigned char sha1[20];
 181         struct stat st1;
 182         char repo_version_string[10];
 183         int reinit;
 184         int filemode;
 185
 186         if (len > sizeof(path)-50)
 187                 die("insane git directory %s", git_dir);
 188         memcpy(path, git_dir, len);
 189
 190         if (len && path[len-1] != '/')
 191                 path[len++] = '/';
 192
 193         /*
 194          * Create .git/refs/{heads,tags}
 195          */
 196         strcpy(path + len, "refs");
 197         safe_create_dir(path, 1);
 198         strcpy(path + len, "refs/heads");
 199         safe_create_dir(path, 1);
 200         strcpy(path + len, "refs/tags");
 201         safe_create_dir(path, 1);
 202
 203         /* First copy the templates -- we might have the default
 204          * config file there, in which case we would want to read
 205          * from it after installing.
 206          */
 207         path[len] = 0;
 208         copy_templates(path, len, template_path);
 209
 210         git_config(git_default_config);
 211
 212         /*
 213          * We would have created the above under user's umask -- under
 214          * shared-repository settings, we would need to fix them up.
 215          */
 216         if (shared_repository) {
 217                 path[len] = 0;
 218                 adjust_shared_perm(path);
 219                 strcpy(path + len, "refs");
 220                 adjust_shared_perm(path);
 221                 strcpy(path + len, "refs/heads");
 222                 adjust_shared_perm(path);
 223                 strcpy(path + len, "refs/tags");
 224                 adjust_shared_perm(path);
 225         }
 226
 227         /*
 228          * Create the default symlink from ".git/HEAD" to the "master"
 229          * branch, if it does not exist yet.
 230          */
 231         strcpy(path + len, "HEAD");
 232         reinit = !read_ref("HEAD", sha1);
 233         if (!reinit) {
 234                 if (create_symref("HEAD", "refs/heads/master", NULL) < 0)
 235                         exit(1);
 236         }
 237
 238         /* This forces creation of new config file */
 239         sprintf(repo_version_string, "%d", GIT_REPO_VERSION);
 240         git_config_set("core.repositoryformatversion", repo_version_string);
 241
 242         path[len] = 0;
 243         strcpy(path + len, "config");
 244
 245         /* Check filemode trustability */
 246         filemode = TEST_FILEMODE;
 247         if (TEST_FILEMODE && !lstat(path, &st1)) {
 248                 struct stat st2;
 249                 filemode = (!chmod(path, st1.st_mode ^ S_IXUSR) &&
 250                                 !lstat(path, &st2) &&
 251                                 st1.st_mode != st2.st_mode);
 252         }
 253         git_config_set("core.filemode", filemode ? "true" : "false");
 254
 255         if (is_bare_repository()) {
 256                 git_config_set("core.bare", "true");
 257         }
 258         else {
 259                 git_config_set("core.bare", "false");
 260                 /* allow template config file to override the default */
 261                 if (log_all_ref_updates == -1)
 262                     git_config_set("core.logallrefupdates", "true");
 263         }
 264         return reinit;
 265 }
 266
 267 static const char init_db_usage[] =
 268 "git-init [--template=<template-directory>] [--shared]";
 269
 270 /*
 271  * If you want to, you can share the DB area with any number of branches.
 272  * That has advantages: you can save space by sharing all the SHA1 objects.
 273  * On the other hand, it might just make lookup slower and messier. You
 274  * be the judge.  The default case is to have one DB per managed directory.
 275  */
 276 int cmd_init_db(int argc, const char **argv, const char *prefix)
 277 {
 278         const char *git_dir;
 279         const char *sha1_dir;
 280         const char *template_dir = NULL;
 281         char *path;
 282         int len, i, reinit;
 283
 284         for (i = 1; i < argc; i++, argv++) {
 285                 const char *arg = argv[1];
 286                 if (!strncmp(arg, "--template=", 11))
 287                         template_dir = arg+11;
 288                 else if (!strcmp(arg, "--shared"))
 289                         shared_repository = PERM_GROUP;
 290                 else if (!strncmp(arg, "--shared=", 9))
 291                         shared_repository = git_config_perm("arg", arg+9);
 292                 else
 293                         usage(init_db_usage);
 294         }
 295
 296         /*
 297          * Set up the default .git directory contents
 298          */
 299         git_dir = getenv(GIT_DIR_ENVIRONMENT);
 300         if (!git_dir)
 301                 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
 302         safe_create_dir(git_dir, 0);
 303
 304         /* Check to see if the repository version is right.
 305          * Note that a newly created repository does not have
 306          * config file, so this will not fail.  What we are catching
 307          * is an attempt to reinitialize new repository with an old tool.
 308          */
 309         check_repository_format();
 310
 311         reinit = create_default_files(git_dir, template_dir);
 312
 313         /*
 314          * And set up the object store.
 315          */
 316         sha1_dir = get_object_directory();
 317         len = strlen(sha1_dir);
 318         path = xmalloc(len + 40);
 319         memcpy(path, sha1_dir, len);
 320
 321         safe_create_dir(sha1_dir, 1);
 322         strcpy(path+len, "/pack");
 323         safe_create_dir(path, 1);
 324         strcpy(path+len, "/info");
 325         safe_create_dir(path, 1);
 326
 327         if (shared_repository) {
 328                 char buf[10];
 329                 /* We do not spell "group" and such, so that
 330                  * the configuration can be read by older version
 331                  * of git.
 332                  */
 333                 sprintf(buf, "%d", shared_repository);
 334                 git_config_set("core.sharedrepository", buf);
 335                 git_config_set("receive.denyNonFastforwards", "true");
 336         }
 337
 338         printf("%s%s Git repository in %s/\n",
 339                 reinit ? "Reinitialized existing" : "Initialized empty",
 340                 shared_repository ? " shared" : "",
 341                 git_dir);
 342
 343         return 0;
 344 }