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
  13#ifdef NO_TRUSTABLE_FILEMODE
  14#define TEST_FILEMODE 0
  15#else
  16#define TEST_FILEMODE 1
  17#endif
  18
  19static 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
  31static 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
  52static 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
 127static 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
 177static 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
 268static const char init_db_usage[] =
 269"git-init [-q | --quiet] [--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 */
 277int 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        int quiet = 0;
 285
 286        for (i = 1; i < argc; i++, argv++) {
 287                const char *arg = argv[1];
 288                if (!prefixcmp(arg, "--template="))
 289                        template_dir = arg+11;
 290                else if (!strcmp(arg, "--shared"))
 291                        shared_repository = PERM_GROUP;
 292                else if (!prefixcmp(arg, "--shared="))
 293                        shared_repository = git_config_perm("arg", arg+9);
 294                else if (!strcmp(arg, "-q") || !strcmp(arg, "--quiet"))
 295                        quiet = 1;
 296                else
 297                        usage(init_db_usage);
 298        }
 299
 300        /*
 301         * Set up the default .git directory contents
 302         */
 303        git_dir = getenv(GIT_DIR_ENVIRONMENT);
 304        if (!git_dir)
 305                git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
 306        safe_create_dir(git_dir, 0);
 307
 308        /* Check to see if the repository version is right.
 309         * Note that a newly created repository does not have
 310         * config file, so this will not fail.  What we are catching
 311         * is an attempt to reinitialize new repository with an old tool.
 312         */
 313        check_repository_format();
 314
 315        reinit = create_default_files(git_dir, template_dir);
 316
 317        /*
 318         * And set up the object store.
 319         */
 320        sha1_dir = get_object_directory();
 321        len = strlen(sha1_dir);
 322        path = xmalloc(len + 40);
 323        memcpy(path, sha1_dir, len);
 324
 325        safe_create_dir(sha1_dir, 1);
 326        strcpy(path+len, "/pack");
 327        safe_create_dir(path, 1);
 328        strcpy(path+len, "/info");
 329        safe_create_dir(path, 1);
 330
 331        if (shared_repository) {
 332                char buf[10];
 333                /* We do not spell "group" and such, so that
 334                 * the configuration can be read by older version
 335                 * of git.
 336                 */
 337                sprintf(buf, "%d", shared_repository);
 338                git_config_set("core.sharedrepository", buf);
 339                git_config_set("receive.denyNonFastforwards", "true");
 340        }
 341
 342        if (!quiet)
 343                printf("%s%s Git repository in %s/\n",
 344                       reinit ? "Reinitialized existing" : "Initialized empty",
 345                       shared_repository ? " shared" : "",
 346                       git_dir);
 347
 348        return 0;
 349}