Andrew's git - gitweb.git/blob

   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
  13static 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
  25static 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
  45static 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
 120static 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 = getenv(TEMPLATE_DIR_ENVIRONMENT);
 129                if (!template_dir)
 130                        template_dir = DEFAULT_GIT_TEMPLATE_DIR;
 131        }
 132        strcpy(template_path, template_dir);
 133        template_len = strlen(template_path);
 134        if (template_path[template_len-1] != '/') {
 135                template_path[template_len++] = '/';
 136                template_path[template_len] = 0;
 137        }
 138        dir = opendir(template_path);
 139        if (!dir) {
 140                fprintf(stderr, "warning: templates not found %s\n",
 141                        template_dir);
 142                return;
 143        }
 144
 145        /* Make sure that template is from the correct vintage */
 146        strcpy(template_path + template_len, "config");
 147        repository_format_version = 0;
 148        git_config_from_file(check_repository_format_version,
 149                             template_path);
 150        template_path[template_len] = 0;
 151
 152        if (repository_format_version &&
 153            repository_format_version != GIT_REPO_VERSION) {
 154                fprintf(stderr, "warning: not copying templates of "
 155                        "a wrong format version %d from '%s'\n",
 156                        repository_format_version,
 157                        template_dir);
 158                closedir(dir);
 159                return;
 160        }
 161
 162        memcpy(path, git_dir, len);
 163        path[len] = 0;
 164        copy_templates_1(path, len,
 165                         template_path, template_len,
 166                         dir);
 167        closedir(dir);
 168}
 169
 170static int create_default_files(const char *git_dir, const char *template_path)
 171{
 172        unsigned len = strlen(git_dir);
 173        static char path[PATH_MAX];
 174        unsigned char sha1[20];
 175        struct stat st1;
 176        char repo_version_string[10];
 177        int reinit;
 178
 179        if (len > sizeof(path)-50)
 180                die("insane git directory %s", git_dir);
 181        memcpy(path, git_dir, len);
 182
 183        if (len && path[len-1] != '/')
 184                path[len++] = '/';
 185
 186        /*
 187         * Create .git/refs/{heads,tags}
 188         */
 189        strcpy(path + len, "refs");
 190        safe_create_dir(path, 1);
 191        strcpy(path + len, "refs/heads");
 192        safe_create_dir(path, 1);
 193        strcpy(path + len, "refs/tags");
 194        safe_create_dir(path, 1);
 195
 196        /* First copy the templates -- we might have the default
 197         * config file there, in which case we would want to read
 198         * from it after installing.
 199         */
 200        path[len] = 0;
 201        copy_templates(path, len, template_path);
 202
 203        git_config(git_default_config);
 204
 205        /*
 206         * We would have created the above under user's umask -- under
 207         * shared-repository settings, we would need to fix them up.
 208         */
 209        if (shared_repository) {
 210                path[len] = 0;
 211                adjust_shared_perm(path);
 212                strcpy(path + len, "refs");
 213                adjust_shared_perm(path);
 214                strcpy(path + len, "refs/heads");
 215                adjust_shared_perm(path);
 216                strcpy(path + len, "refs/tags");
 217                adjust_shared_perm(path);
 218        }
 219
 220        /*
 221         * Create the default symlink from ".git/HEAD" to the "master"
 222         * branch, if it does not exist yet.
 223         */
 224        strcpy(path + len, "HEAD");
 225        reinit = !read_ref("HEAD", sha1);
 226        if (!reinit) {
 227                if (create_symref("HEAD", "refs/heads/master") < 0)
 228                        exit(1);
 229        }
 230
 231        /* This forces creation of new config file */
 232        sprintf(repo_version_string, "%d", GIT_REPO_VERSION);
 233        git_config_set("core.repositoryformatversion", repo_version_string);
 234
 235        path[len] = 0;
 236        strcpy(path + len, "config");
 237
 238        /* Check filemode trustability */
 239        if (!lstat(path, &st1)) {
 240                struct stat st2;
 241                int filemode = (!chmod(path, st1.st_mode ^ S_IXUSR) &&
 242                                !lstat(path, &st2) &&
 243                                st1.st_mode != st2.st_mode);
 244                git_config_set("core.filemode",
 245                               filemode ? "true" : "false");
 246        }
 247
 248        /* Enable logAllRefUpdates if a working tree is attached */
 249        if (!is_bare_git_dir(git_dir))
 250                git_config_set("core.logallrefupdates", "true");
 251        return reinit;
 252}
 253
 254static const char init_db_usage[] =
 255"git-init-db [--template=<template-directory>] [--shared]";
 256
 257/*
 258 * If you want to, you can share the DB area with any number of branches.
 259 * That has advantages: you can save space by sharing all the SHA1 objects.
 260 * On the other hand, it might just make lookup slower and messier. You
 261 * be the judge.  The default case is to have one DB per managed directory.
 262 */
 263int cmd_init_db(int argc, const char **argv, const char *prefix)
 264{
 265        const char *git_dir;
 266        const char *sha1_dir;
 267        const char *template_dir = NULL;
 268        char *path;
 269        int len, i, reinit;
 270
 271        for (i = 1; i < argc; i++, argv++) {
 272                const char *arg = argv[1];
 273                if (!strncmp(arg, "--template=", 11))
 274                        template_dir = arg+11;
 275                else if (!strcmp(arg, "--shared"))
 276                        shared_repository = PERM_GROUP;
 277                else if (!strncmp(arg, "--shared=", 9))
 278                        shared_repository = git_config_perm("arg", arg+9);
 279                else
 280                        usage(init_db_usage);
 281        }
 282
 283        /*
 284         * Set up the default .git directory contents
 285         */
 286        git_dir = getenv(GIT_DIR_ENVIRONMENT);
 287        if (!git_dir)
 288                git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
 289        safe_create_dir(git_dir, 0);
 290
 291        /* Check to see if the repository version is right.
 292         * Note that a newly created repository does not have
 293         * config file, so this will not fail.  What we are catching
 294         * is an attempt to reinitialize new repository with an old tool.
 295         */
 296        check_repository_format();
 297
 298        reinit = create_default_files(git_dir, template_dir);
 299
 300        /*
 301         * And set up the object store.
 302         */
 303        sha1_dir = get_object_directory();
 304        len = strlen(sha1_dir);
 305        path = xmalloc(len + 40);
 306        memcpy(path, sha1_dir, len);
 307
 308        safe_create_dir(sha1_dir, 1);
 309        strcpy(path+len, "/pack");
 310        safe_create_dir(path, 1);
 311        strcpy(path+len, "/info");
 312        safe_create_dir(path, 1);
 313
 314        if (shared_repository) {
 315                char buf[10];
 316                /* We do not spell "group" and such, so that
 317                 * the configuration can be read by older version
 318                 * of git.
 319                 */
 320                sprintf(buf, "%d", shared_repository);
 321                git_config_set("core.sharedrepository", buf);
 322                git_config_set("receive.denyNonFastforwards", "true");
 323        }
 324
 325        printf("%s%s Git repository in %s/\n",
 326                reinit ? "Reinitialized existing" : "Initialized empty",
 327                shared_repository ? " shared" : "",
 328                git_dir);
 329
 330        return 0;
 331}