init-db.c

   1 /*
   2  * GIT - The information manager from hell
   3  *
   4  * Copyright (C) Linus Torvalds, 2005
   5  */
   6 #include "cache.h"
   7
   8 #ifndef DEFAULT_GIT_TEMPLATE_DIR
   9 #define DEFAULT_GIT_TEMPLATE_DIR "/usr/share/git-core/templates/"
  10 #endif
  11
  12 static void safe_create_dir(const char *dir, int share)
  13 {
  14         if (mkdir(dir, 0777) < 0) {
  15                 if (errno != EEXIST) {
  16                         perror(dir);
  17                         exit(1);
  18                 }
  19         }
  20         else if (share && adjust_shared_perm(dir))
  21                 die("Could not make %s writable by group\n", dir);
  22 }
  23
  24 static int copy_file(const char *dst, const char *src, int mode)
  25 {
  26         int fdi, fdo, status;
  27
  28         mode = (mode & 0111) ? 0777 : 0666;
  29         if ((fdi = open(src, O_RDONLY)) < 0)
  30                 return fdi;
  31         if ((fdo = open(dst, O_WRONLY | O_CREAT | O_EXCL, mode)) < 0) {
  32                 close(fdi);
  33                 return fdo;
  34         }
  35         status = copy_fd(fdi, fdo);
  36         close(fdo);
  37
  38         if (!status && adjust_shared_perm(dst))
  39                 return -1;
  40
  41         return status;
  42 }
  43
  44 static void copy_templates_1(char *path, int baselen,
  45                              char *template, int template_baselen,
  46                              DIR *dir)
  47 {
  48         struct dirent *de;
  49
  50         /* Note: if ".git/hooks" file exists in the repository being
  51          * re-initialized, /etc/core-git/templates/hooks/update would
  52          * cause git-init-db to fail here.  I think this is sane but
  53          * it means that the set of templates we ship by default, along
  54          * with the way the namespace under .git/ is organized, should
  55          * be really carefully chosen.
  56          */
  57         safe_create_dir(path, 1);
  58         while ((de = readdir(dir)) != NULL) {
  59                 struct stat st_git, st_template;
  60                 int namelen;
  61                 int exists = 0;
  62
  63                 if (de->d_name[0] == '.')
  64                         continue;
  65                 namelen = strlen(de->d_name);
  66                 if ((PATH_MAX <= baselen + namelen) ||
  67                     (PATH_MAX <= template_baselen + namelen))
  68                         die("insanely long template name %s", de->d_name);
  69                 memcpy(path + baselen, de->d_name, namelen+1);
  70                 memcpy(template + template_baselen, de->d_name, namelen+1);
  71                 if (lstat(path, &st_git)) {
  72                         if (errno != ENOENT)
  73                                 die("cannot stat %s", path);
  74                 }
  75                 else
  76                         exists = 1;
  77
  78                 if (lstat(template, &st_template))
  79                         die("cannot stat template %s", template);
  80
  81                 if (S_ISDIR(st_template.st_mode)) {
  82                         DIR *subdir = opendir(template);
  83                         int baselen_sub = baselen + namelen;
  84                         int template_baselen_sub = template_baselen + namelen;
  85                         if (!subdir)
  86                                 die("cannot opendir %s", template);
  87                         path[baselen_sub++] =
  88                                 template[template_baselen_sub++] = '/';
  89                         path[baselen_sub] =
  90                                 template[template_baselen_sub] = 0;
  91                         copy_templates_1(path, baselen_sub,
  92                                          template, template_baselen_sub,
  93                                          subdir);
  94                         closedir(subdir);
  95                 }
  96                 else if (exists)
  97                         continue;
  98                 else if (S_ISLNK(st_template.st_mode)) {
  99                         char lnk[256];
 100                         int len;
 101                         len = readlink(template, lnk, sizeof(lnk));
 102                         if (len < 0)
 103                                 die("cannot readlink %s", template);
 104                         if (sizeof(lnk) <= len)
 105                                 die("insanely long symlink %s", template);
 106                         lnk[len] = 0;
 107                         if (symlink(lnk, path))
 108                                 die("cannot symlink %s %s", lnk, path);
 109                 }
 110                 else if (S_ISREG(st_template.st_mode)) {
 111                         if (copy_file(path, template, st_template.st_mode))
 112                                 die("cannot copy %s to %s", template, path);
 113                 }
 114                 else
 115                         error("ignoring template %s", template);
 116         }
 117 }
 118
 119 static void copy_templates(const char *git_dir, int len, char *template_dir)
 120 {
 121         char path[PATH_MAX];
 122         char template_path[PATH_MAX];
 123         int template_len;
 124         DIR *dir;
 125
 126         if (!template_dir)
 127                 template_dir = DEFAULT_GIT_TEMPLATE_DIR;
 128         strcpy(template_path, template_dir);
 129         template_len = strlen(template_path);
 130         if (template_path[template_len-1] != '/') {
 131                 template_path[template_len++] = '/';
 132                 template_path[template_len] = 0;
 133         }
 134         dir = opendir(template_path);
 135         if (!dir) {
 136                 fprintf(stderr, "warning: templates not found %s\n",
 137                         template_dir);
 138                 return;
 139         }
 140
 141         /* Make sure that template is from the correct vintage */
 142         strcpy(template_path + template_len, "config");
 143         repository_format_version = 0;
 144         git_config_from_file(check_repository_format_version,
 145                              template_path);
 146         template_path[template_len] = 0;
 147
 148         if (repository_format_version &&
 149             repository_format_version != GIT_REPO_VERSION) {
 150                 fprintf(stderr, "warning: not copying templates of "
 151                         "a wrong format version %d from '%s'\n",
 152                         repository_format_version,
 153                         template_dir);
 154                 closedir(dir);
 155                 return;
 156         }
 157
 158         memcpy(path, git_dir, len);
 159         path[len] = 0;
 160         copy_templates_1(path, len,
 161                          template_path, template_len,
 162                          dir);
 163         closedir(dir);
 164 }
 165
 166 static void create_default_files(const char *git_dir, char *template_path)
 167 {
 168         unsigned len = strlen(git_dir);
 169         static char path[PATH_MAX];
 170         unsigned char sha1[20];
 171         struct stat st1;
 172         char repo_version_string[10];
 173
 174         if (len > sizeof(path)-50)
 175                 die("insane git directory %s", git_dir);
 176         memcpy(path, git_dir, len);
 177
 178         if (len && path[len-1] != '/')
 179                 path[len++] = '/';
 180
 181         /*
 182          * Create .git/refs/{heads,tags}
 183          */
 184         strcpy(path + len, "refs");
 185         safe_create_dir(path, 1);
 186         strcpy(path + len, "refs/heads");
 187         safe_create_dir(path, 1);
 188         strcpy(path + len, "refs/tags");
 189         safe_create_dir(path, 1);
 190
 191         /* First copy the templates -- we might have the default
 192          * config file there, in which case we would want to read
 193          * from it after installing.
 194          */
 195         path[len] = 0;
 196         copy_templates(path, len, template_path);
 197
 198         git_config(git_default_config);
 199
 200         /*
 201          * Create the default symlink from ".git/HEAD" to the "master"
 202          * branch, if it does not exist yet.
 203          */
 204         strcpy(path + len, "HEAD");
 205         if (read_ref(path, sha1) < 0) {
 206                 if (create_symref(path, "refs/heads/master") < 0)
 207                         exit(1);
 208         }
 209
 210         /* This forces creation of new config file */
 211         sprintf(repo_version_string, "%d", GIT_REPO_VERSION);
 212         git_config_set("core.repositoryformatversion", repo_version_string);
 213
 214         path[len] = 0;
 215         strcpy(path + len, "config");
 216
 217         /* Check filemode trustability */
 218         if (!lstat(path, &st1)) {
 219                 struct stat st2;
 220                 int filemode = (!chmod(path, st1.st_mode ^ S_IXUSR) &&
 221                                 !lstat(path, &st2) &&
 222                                 st1.st_mode != st2.st_mode);
 223                 git_config_set("core.filemode",
 224                                filemode ? "true" : "false");
 225         }
 226 }
 227
 228 static const char init_db_usage[] =
 229 "git-init-db [--template=<template-directory>] [--shared]";
 230
 231 /*
 232  * If you want to, you can share the DB area with any number of branches.
 233  * That has advantages: you can save space by sharing all the SHA1 objects.
 234  * On the other hand, it might just make lookup slower and messier. You
 235  * be the judge.  The default case is to have one DB per managed directory.
 236  */
 237 int main(int argc, char **argv)
 238 {
 239         const char *git_dir;
 240         const char *sha1_dir;
 241         char *path, *template_dir = NULL;
 242         int len, i;
 243
 244         for (i = 1; i < argc; i++, argv++) {
 245                 char *arg = argv[1];
 246                 if (!strncmp(arg, "--template=", 11))
 247                         template_dir = arg+11;
 248                 else if (!strcmp(arg, "--shared"))
 249                         shared_repository = 1;
 250                 else
 251                         die(init_db_usage);
 252         }
 253
 254         /*
 255          * Set up the default .git directory contents
 256          */
 257         git_dir = getenv(GIT_DIR_ENVIRONMENT);
 258         if (!git_dir) {
 259                 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
 260                 fprintf(stderr, "defaulting to local storage area\n");
 261         }
 262         safe_create_dir(git_dir, 0);
 263
 264         /* Check to see if the repository version is right.
 265          * Note that a newly created repository does not have
 266          * config file, so this will not fail.  What we are catching
 267          * is an attempt to reinitialize new repository with an old tool.
 268          */
 269         check_repository_format();
 270
 271         create_default_files(git_dir, template_dir);
 272
 273         /*
 274          * And set up the object store.
 275          */
 276         sha1_dir = get_object_directory();
 277         len = strlen(sha1_dir);
 278         path = xmalloc(len + 40);
 279         memcpy(path, sha1_dir, len);
 280
 281         safe_create_dir(sha1_dir, 1);
 282         strcpy(path+len, "/pack");
 283         safe_create_dir(path, 1);
 284         strcpy(path+len, "/info");
 285         safe_create_dir(path, 1);
 286
 287         if (shared_repository)
 288                 git_config_set("core.sharedRepository", "true");
 289
 290         return 0;
 291 }