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