cgit.c

   1 /* cgit.c: cgi for the git scm
   2  *
   3  * Copyright (C) 2006 Lars Hjemli
   4  *
   5  * Licensed under GNU General Public License v2
   6  *   (see COPYING for full license text)
   7  */
   8
   9 #include "cgit.h"
  10 #include "cache.h"
  11 #include "cmd.h"
  12 #include "configfile.h"
  13 #include "html.h"
  14 #include "ui-shared.h"
  15 #include "ui-stats.h"
  16 #include "scan-tree.h"
  17
  18 const char *cgit_version = CGIT_VERSION;
  19
  20 void add_mimetype(const char *name, const char *value)
  21 {
  22         struct string_list_item *item;
  23
  24         item = string_list_insert(xstrdup(name), &ctx.cfg.mimetypes);
  25         item->util = xstrdup(value);
  26 }
  27
  28 struct cgit_filter *new_filter(const char *cmd, int extra_args)
  29 {
  30         struct cgit_filter *f;
  31
  32         if (!cmd || !cmd[0])
  33                 return NULL;
  34
  35         f = xmalloc(sizeof(struct cgit_filter));
  36         f->cmd = xstrdup(cmd);
  37         f->argv = xmalloc((2 + extra_args) * sizeof(char *));
  38         f->argv[0] = f->cmd;
  39         f->argv[1] = NULL;
  40         return f;
  41 }
  42
  43 static void process_cached_repolist(const char *path);
  44
  45 void repo_config(struct cgit_repo *repo, const char *name, const char *value)
  46 {
  47         if (!strcmp(name, "name"))
  48                 repo->name = xstrdup(value);
  49         else if (!strcmp(name, "clone-url"))
  50                 repo->clone_url = xstrdup(value);
  51         else if (!strcmp(name, "desc"))
  52                 repo->desc = xstrdup(value);
  53         else if (!strcmp(name, "owner"))
  54                 repo->owner = xstrdup(value);
  55         else if (!strcmp(name, "defbranch"))
  56                 repo->defbranch = xstrdup(value);
  57         else if (!strcmp(name, "snapshots"))
  58                 repo->snapshots = ctx.cfg.snapshots & cgit_parse_snapshots_mask(value);
  59         else if (!strcmp(name, "enable-log-filecount"))
  60                 repo->enable_log_filecount = ctx.cfg.enable_log_filecount * atoi(value);
  61         else if (!strcmp(name, "enable-log-linecount"))
  62                 repo->enable_log_linecount = ctx.cfg.enable_log_linecount * atoi(value);
  63         else if (!strcmp(name, "max-stats"))
  64                 repo->max_stats = cgit_find_stats_period(value, NULL);
  65         else if (!strcmp(name, "module-link"))
  66                 repo->module_link= xstrdup(value);
  67         else if (!strcmp(name, "section"))
  68                 repo->section = xstrdup(value);
  69         else if (!strcmp(name, "readme") && value != NULL) {
  70                 if (*value == '/')
  71                         ctx.repo->readme = xstrdup(value);
  72                 else
  73                         ctx.repo->readme = xstrdup(fmt("%s/%s", ctx.repo->path, value));
  74         } else if (ctx.cfg.enable_filter_overrides) {
  75                 if (!strcmp(name, "about-filter"))
  76                         repo->about_filter = new_filter(value, 0);
  77                 else if (!strcmp(name, "commit-filter"))
  78                         repo->commit_filter = new_filter(value, 0);
  79                 else if (!strcmp(name, "source-filter"))
  80                         repo->source_filter = new_filter(value, 1);
  81         }
  82 }
  83
  84 void config_cb(const char *name, const char *value)
  85 {
  86         if (!strcmp(name, "section") || !strcmp(name, "repo.group"))
  87                 ctx.cfg.section = xstrdup(value);
  88         else if (!strcmp(name, "repo.url"))
  89                 ctx.repo = cgit_add_repo(value);
  90         else if (ctx.repo && !strcmp(name, "repo.path"))
  91                 ctx.repo->path = trim_end(value, '/');
  92         else if (ctx.repo && !prefixcmp(name, "repo."))
  93                 repo_config(ctx.repo, name + 5, value);
  94         else if (!strcmp(name, "root-title"))
  95                 ctx.cfg.root_title = xstrdup(value);
  96         else if (!strcmp(name, "root-desc"))
  97                 ctx.cfg.root_desc = xstrdup(value);
  98         else if (!strcmp(name, "root-readme"))
  99                 ctx.cfg.root_readme = xstrdup(value);
 100         else if (!strcmp(name, "css"))
 101                 ctx.cfg.css = xstrdup(value);
 102         else if (!strcmp(name, "favicon"))
 103                 ctx.cfg.favicon = xstrdup(value);
 104         else if (!strcmp(name, "footer"))
 105                 ctx.cfg.footer = xstrdup(value);
 106         else if (!strcmp(name, "head-include"))
 107                 ctx.cfg.head_include = xstrdup(value);
 108         else if (!strcmp(name, "header"))
 109                 ctx.cfg.header = xstrdup(value);
 110         else if (!strcmp(name, "logo"))
 111                 ctx.cfg.logo = xstrdup(value);
 112         else if (!strcmp(name, "index-header"))
 113                 ctx.cfg.index_header = xstrdup(value);
 114         else if (!strcmp(name, "index-info"))
 115                 ctx.cfg.index_info = xstrdup(value);
 116         else if (!strcmp(name, "logo-link"))
 117                 ctx.cfg.logo_link = xstrdup(value);
 118         else if (!strcmp(name, "module-link"))
 119                 ctx.cfg.module_link = xstrdup(value);
 120         else if (!strcmp(name, "virtual-root")) {
 121                 ctx.cfg.virtual_root = trim_end(value, '/');
 122                 if (!ctx.cfg.virtual_root && (!strcmp(value, "/")))
 123                         ctx.cfg.virtual_root = "";
 124         } else if (!strcmp(name, "nocache"))
 125                 ctx.cfg.nocache = atoi(value);
 126         else if (!strcmp(name, "noplainemail"))
 127                 ctx.cfg.noplainemail = atoi(value);
 128         else if (!strcmp(name, "noheader"))
 129                 ctx.cfg.noheader = atoi(value);
 130         else if (!strcmp(name, "snapshots"))
 131                 ctx.cfg.snapshots = cgit_parse_snapshots_mask(value);
 132         else if (!strcmp(name, "enable-filter-overrides"))
 133                 ctx.cfg.enable_filter_overrides = atoi(value);
 134         else if (!strcmp(name, "enable-index-links"))
 135                 ctx.cfg.enable_index_links = atoi(value);
 136         else if (!strcmp(name, "enable-log-filecount"))
 137                 ctx.cfg.enable_log_filecount = atoi(value);
 138         else if (!strcmp(name, "enable-log-linecount"))
 139                 ctx.cfg.enable_log_linecount = atoi(value);
 140         else if (!strcmp(name, "enable-tree-linenumbers"))
 141                 ctx.cfg.enable_tree_linenumbers = atoi(value);
 142         else if (!strcmp(name, "max-stats"))
 143                 ctx.cfg.max_stats = cgit_find_stats_period(value, NULL);
 144         else if (!strcmp(name, "cache-size"))
 145                 ctx.cfg.cache_size = atoi(value);
 146         else if (!strcmp(name, "cache-root"))
 147                 ctx.cfg.cache_root = xstrdup(value);
 148         else if (!strcmp(name, "cache-root-ttl"))
 149                 ctx.cfg.cache_root_ttl = atoi(value);
 150         else if (!strcmp(name, "cache-repo-ttl"))
 151                 ctx.cfg.cache_repo_ttl = atoi(value);
 152         else if (!strcmp(name, "cache-scanrc-ttl"))
 153                 ctx.cfg.cache_scanrc_ttl = atoi(value);
 154         else if (!strcmp(name, "cache-static-ttl"))
 155                 ctx.cfg.cache_static_ttl = atoi(value);
 156         else if (!strcmp(name, "cache-dynamic-ttl"))
 157                 ctx.cfg.cache_dynamic_ttl = atoi(value);
 158         else if (!strcmp(name, "about-filter"))
 159                 ctx.cfg.about_filter = new_filter(value, 0);
 160         else if (!strcmp(name, "commit-filter"))
 161                 ctx.cfg.commit_filter = new_filter(value, 0);
 162         else if (!strcmp(name, "embedded"))
 163                 ctx.cfg.embedded = atoi(value);
 164         else if (!strcmp(name, "max-message-length"))
 165                 ctx.cfg.max_msg_len = atoi(value);
 166         else if (!strcmp(name, "max-repodesc-length"))
 167                 ctx.cfg.max_repodesc_len = atoi(value);
 168         else if (!strcmp(name, "max-blob-size"))
 169                 ctx.cfg.max_blob_size = atoi(value);
 170         else if (!strcmp(name, "max-repo-count"))
 171                 ctx.cfg.max_repo_count = atoi(value);
 172         else if (!strcmp(name, "max-commit-count"))
 173                 ctx.cfg.max_commit_count = atoi(value);
 174         else if (!strcmp(name, "scan-path"))
 175                 if (!ctx.cfg.nocache && ctx.cfg.cache_size)
 176                         process_cached_repolist(value);
 177                 else
 178                         scan_tree(value, repo_config);
 179         else if (!strcmp(name, "source-filter"))
 180                 ctx.cfg.source_filter = new_filter(value, 1);
 181         else if (!strcmp(name, "summary-log"))
 182                 ctx.cfg.summary_log = atoi(value);
 183         else if (!strcmp(name, "summary-branches"))
 184                 ctx.cfg.summary_branches = atoi(value);
 185         else if (!strcmp(name, "summary-tags"))
 186                 ctx.cfg.summary_tags = atoi(value);
 187         else if (!strcmp(name, "agefile"))
 188                 ctx.cfg.agefile = xstrdup(value);
 189         else if (!strcmp(name, "renamelimit"))
 190                 ctx.cfg.renamelimit = atoi(value);
 191         else if (!strcmp(name, "robots"))
 192                 ctx.cfg.robots = xstrdup(value);
 193         else if (!strcmp(name, "clone-prefix"))
 194                 ctx.cfg.clone_prefix = xstrdup(value);
 195         else if (!strcmp(name, "local-time"))
 196                 ctx.cfg.local_time = atoi(value);
 197         else if (!prefixcmp(name, "mimetype."))
 198                 add_mimetype(name + 9, value);
 199         else if (!strcmp(name, "include"))
 200                 parse_configfile(value, config_cb);
 201 }
 202
 203 static void querystring_cb(const char *name, const char *value)
 204 {
 205         if (!value)
 206                 value = "";
 207
 208         if (!strcmp(name,"r")) {
 209                 ctx.qry.repo = xstrdup(value);
 210                 ctx.repo = cgit_get_repoinfo(value);
 211         } else if (!strcmp(name, "p")) {
 212                 ctx.qry.page = xstrdup(value);
 213         } else if (!strcmp(name, "url")) {
 214                 if (*value == '/')
 215                         value++;
 216                 ctx.qry.url = xstrdup(value);
 217                 cgit_parse_url(value);
 218         } else if (!strcmp(name, "qt")) {
 219                 ctx.qry.grep = xstrdup(value);
 220         } else if (!strcmp(name, "q")) {
 221                 ctx.qry.search = xstrdup(value);
 222         } else if (!strcmp(name, "h")) {
 223                 ctx.qry.head = xstrdup(value);
 224                 ctx.qry.has_symref = 1;
 225         } else if (!strcmp(name, "id")) {
 226                 ctx.qry.sha1 = xstrdup(value);
 227                 ctx.qry.has_sha1 = 1;
 228         } else if (!strcmp(name, "id2")) {
 229                 ctx.qry.sha2 = xstrdup(value);
 230                 ctx.qry.has_sha1 = 1;
 231         } else if (!strcmp(name, "ofs")) {
 232                 ctx.qry.ofs = atoi(value);
 233         } else if (!strcmp(name, "path")) {
 234                 ctx.qry.path = trim_end(value, '/');
 235         } else if (!strcmp(name, "name")) {
 236                 ctx.qry.name = xstrdup(value);
 237         } else if (!strcmp(name, "mimetype")) {
 238                 ctx.qry.mimetype = xstrdup(value);
 239         } else if (!strcmp(name, "s")){
 240                 ctx.qry.sort = xstrdup(value);
 241         } else if (!strcmp(name, "showmsg")) {
 242                 ctx.qry.showmsg = atoi(value);
 243         } else if (!strcmp(name, "period")) {
 244                 ctx.qry.period = xstrdup(value);
 245         }
 246 }
 247
 248 char *xstrdupn(const char *str)
 249 {
 250         return (str ? xstrdup(str) : NULL);
 251 }
 252
 253 static void prepare_context(struct cgit_context *ctx)
 254 {
 255         memset(ctx, 0, sizeof(ctx));
 256         ctx->cfg.agefile = "info/web/last-modified";
 257         ctx->cfg.nocache = 0;
 258         ctx->cfg.cache_size = 0;
 259         ctx->cfg.cache_dynamic_ttl = 5;
 260         ctx->cfg.cache_max_create_time = 5;
 261         ctx->cfg.cache_repo_ttl = 5;
 262         ctx->cfg.cache_root = CGIT_CACHE_ROOT;
 263         ctx->cfg.cache_root_ttl = 5;
 264         ctx->cfg.cache_scanrc_ttl = 15;
 265         ctx->cfg.cache_static_ttl = -1;
 266         ctx->cfg.css = "/cgit.css";
 267         ctx->cfg.logo = "/cgit.png";
 268         ctx->cfg.local_time = 0;
 269         ctx->cfg.enable_tree_linenumbers = 1;
 270         ctx->cfg.max_repo_count = 50;
 271         ctx->cfg.max_commit_count = 50;
 272         ctx->cfg.max_lock_attempts = 5;
 273         ctx->cfg.max_msg_len = 80;
 274         ctx->cfg.max_repodesc_len = 80;
 275         ctx->cfg.max_blob_size = 0;
 276         ctx->cfg.max_stats = 0;
 277         ctx->cfg.module_link = "./?repo=%s&page=commit&id=%s";
 278         ctx->cfg.renamelimit = -1;
 279         ctx->cfg.robots = "index, nofollow";
 280         ctx->cfg.root_title = "Git repository browser";
 281         ctx->cfg.root_desc = "a fast webinterface for the git dscm";
 282         ctx->cfg.script_name = CGIT_SCRIPT_NAME;
 283         ctx->cfg.section = "";
 284         ctx->cfg.summary_branches = 10;
 285         ctx->cfg.summary_log = 10;
 286         ctx->cfg.summary_tags = 10;
 287         ctx->env.cgit_config = xstrdupn(getenv("CGIT_CONFIG"));
 288         ctx->env.http_host = xstrdupn(getenv("HTTP_HOST"));
 289         ctx->env.https = xstrdupn(getenv("HTTPS"));
 290         ctx->env.no_http = xstrdupn(getenv("NO_HTTP"));
 291         ctx->env.path_info = xstrdupn(getenv("PATH_INFO"));
 292         ctx->env.query_string = xstrdupn(getenv("QUERY_STRING"));
 293         ctx->env.request_method = xstrdupn(getenv("REQUEST_METHOD"));
 294         ctx->env.script_name = xstrdupn(getenv("SCRIPT_NAME"));
 295         ctx->env.server_name = xstrdupn(getenv("SERVER_NAME"));
 296         ctx->env.server_port = xstrdupn(getenv("SERVER_PORT"));
 297         ctx->page.mimetype = "text/html";
 298         ctx->page.charset = PAGE_ENCODING;
 299         ctx->page.filename = NULL;
 300         ctx->page.size = 0;
 301         ctx->page.modified = time(NULL);
 302         ctx->page.expires = ctx->page.modified;
 303         ctx->page.etag = NULL;
 304         memset(&ctx->cfg.mimetypes, 0, sizeof(struct string_list));
 305         if (ctx->env.script_name)
 306                 ctx->cfg.script_name = ctx->env.script_name;
 307         if (ctx->env.query_string)
 308                 ctx->qry.raw = ctx->env.query_string;
 309         if (!ctx->env.cgit_config)
 310                 ctx->env.cgit_config = CGIT_CONFIG;
 311 }
 312
 313 struct refmatch {
 314         char *req_ref;
 315         char *first_ref;
 316         int match;
 317 };
 318
 319 int find_current_ref(const char *refname, const unsigned char *sha1,
 320                      int flags, void *cb_data)
 321 {
 322         struct refmatch *info;
 323
 324         info = (struct refmatch *)cb_data;
 325         if (!strcmp(refname, info->req_ref))
 326                 info->match = 1;
 327         if (!info->first_ref)
 328                 info->first_ref = xstrdup(refname);
 329         return info->match;
 330 }
 331
 332 char *find_default_branch(struct cgit_repo *repo)
 333 {
 334         struct refmatch info;
 335         char *ref;
 336
 337         info.req_ref = repo->defbranch;
 338         info.first_ref = NULL;
 339         info.match = 0;
 340         for_each_branch_ref(find_current_ref, &info);
 341         if (info.match)
 342                 ref = info.req_ref;
 343         else
 344                 ref = info.first_ref;
 345         if (ref)
 346                 ref = xstrdup(ref);
 347         return ref;
 348 }
 349
 350 static int prepare_repo_cmd(struct cgit_context *ctx)
 351 {
 352         char *tmp;
 353         unsigned char sha1[20];
 354         int nongit = 0;
 355
 356         setenv("GIT_DIR", ctx->repo->path, 1);
 357         setup_git_directory_gently(&nongit);
 358         if (nongit) {
 359                 ctx->page.title = fmt("%s - %s", ctx->cfg.root_title,
 360                                       "config error");
 361                 tmp = fmt("Not a git repository: '%s'", ctx->repo->path);
 362                 ctx->repo = NULL;
 363                 cgit_print_http_headers(ctx);
 364                 cgit_print_docstart(ctx);
 365                 cgit_print_pageheader(ctx);
 366                 cgit_print_error(tmp);
 367                 cgit_print_docend();
 368                 return 1;
 369         }
 370         ctx->page.title = fmt("%s - %s", ctx->repo->name, ctx->repo->desc);
 371
 372         if (!ctx->qry.head) {
 373                 ctx->qry.nohead = 1;
 374                 ctx->qry.head = find_default_branch(ctx->repo);
 375                 ctx->repo->defbranch = ctx->qry.head;
 376         }
 377
 378         if (!ctx->qry.head) {
 379                 cgit_print_http_headers(ctx);
 380                 cgit_print_docstart(ctx);
 381                 cgit_print_pageheader(ctx);
 382                 cgit_print_error("Repository seems to be empty");
 383                 cgit_print_docend();
 384                 return 1;
 385         }
 386
 387         if (get_sha1(ctx->qry.head, sha1)) {
 388                 tmp = xstrdup(ctx->qry.head);
 389                 ctx->qry.head = ctx->repo->defbranch;
 390                 ctx->page.status = 404;
 391                 ctx->page.statusmsg = "not found";
 392                 cgit_print_http_headers(ctx);
 393                 cgit_print_docstart(ctx);
 394                 cgit_print_pageheader(ctx);
 395                 cgit_print_error(fmt("Invalid branch: %s", tmp));
 396                 cgit_print_docend();
 397                 return 1;
 398         }
 399         return 0;
 400 }
 401
 402 static void process_request(void *cbdata)
 403 {
 404         struct cgit_context *ctx = cbdata;
 405         struct cgit_cmd *cmd;
 406
 407         cmd = cgit_get_cmd(ctx);
 408         if (!cmd) {
 409                 ctx->page.title = "cgit error";
 410                 cgit_print_http_headers(ctx);
 411                 cgit_print_docstart(ctx);
 412                 cgit_print_pageheader(ctx);
 413                 cgit_print_error("Invalid request");
 414                 cgit_print_docend();
 415                 return;
 416         }
 417
 418         if (cmd->want_repo && !ctx->repo) {
 419                 cgit_print_http_headers(ctx);
 420                 cgit_print_docstart(ctx);
 421                 cgit_print_pageheader(ctx);
 422                 cgit_print_error(fmt("No repository selected"));
 423                 cgit_print_docend();
 424                 return;
 425         }
 426
 427         if (ctx->repo && prepare_repo_cmd(ctx))
 428                 return;
 429
 430         if (cmd->want_layout) {
 431                 cgit_print_http_headers(ctx);
 432                 cgit_print_docstart(ctx);
 433                 cgit_print_pageheader(ctx);
 434         }
 435
 436         cmd->fn(ctx);
 437
 438         if (cmd->want_layout)
 439                 cgit_print_docend();
 440 }
 441
 442 int cmp_repos(const void *a, const void *b)
 443 {
 444         const struct cgit_repo *ra = a, *rb = b;
 445         return strcmp(ra->url, rb->url);
 446 }
 447
 448 char *build_snapshot_setting(int bitmap)
 449 {
 450         const struct cgit_snapshot_format *f;
 451         char *result = xstrdup("");
 452         char *tmp;
 453         int len;
 454
 455         for (f = cgit_snapshot_formats; f->suffix; f++) {
 456                 if (f->bit & bitmap) {
 457                         tmp = result;
 458                         result = xstrdup(fmt("%s%s ", tmp, f->suffix));
 459                         free(tmp);
 460                 }
 461         }
 462         len = strlen(result);
 463         if (len)
 464                 result[len - 1] = '\0';
 465         return result;
 466 }
 467
 468 char *get_first_line(char *txt)
 469 {
 470         char *t = xstrdup(txt);
 471         char *p = strchr(t, '\n');
 472         if (p)
 473                 *p = '\0';
 474         return t;
 475 }
 476
 477 void print_repo(FILE *f, struct cgit_repo *repo)
 478 {
 479         fprintf(f, "repo.url=%s\n", repo->url);
 480         fprintf(f, "repo.name=%s\n", repo->name);
 481         fprintf(f, "repo.path=%s\n", repo->path);
 482         if (repo->owner)
 483                 fprintf(f, "repo.owner=%s\n", repo->owner);
 484         if (repo->desc) {
 485                 char *tmp = get_first_line(repo->desc);
 486                 fprintf(f, "repo.desc=%s\n", tmp);
 487                 free(tmp);
 488         }
 489         if (repo->readme)
 490                 fprintf(f, "repo.readme=%s\n", repo->readme);
 491         if (repo->defbranch)
 492                 fprintf(f, "repo.defbranch=%s\n", repo->defbranch);
 493         if (repo->module_link)
 494                 fprintf(f, "repo.module-link=%s\n", repo->module_link);
 495         if (repo->section)
 496                 fprintf(f, "repo.section=%s\n", repo->section);
 497         if (repo->clone_url)
 498                 fprintf(f, "repo.clone-url=%s\n", repo->clone_url);
 499         fprintf(f, "repo.enable-log-filecount=%d\n",
 500                 repo->enable_log_filecount);
 501         fprintf(f, "repo.enable-log-linecount=%d\n",
 502                 repo->enable_log_linecount);
 503         if (repo->about_filter && repo->about_filter != ctx.cfg.about_filter)
 504                 fprintf(f, "repo.about-filter=%s\n", repo->about_filter->cmd);
 505         if (repo->commit_filter && repo->commit_filter != ctx.cfg.commit_filter)
 506                 fprintf(f, "repo.commit-filter=%s\n", repo->commit_filter->cmd);
 507         if (repo->source_filter && repo->source_filter != ctx.cfg.source_filter)
 508                 fprintf(f, "repo.source-filter=%s\n", repo->source_filter->cmd);
 509         if (repo->snapshots != ctx.cfg.snapshots) {
 510                 char *tmp = build_snapshot_setting(repo->snapshots);
 511                 fprintf(f, "repo.snapshots=%s\n", tmp);
 512                 free(tmp);
 513         }
 514         if (repo->max_stats != ctx.cfg.max_stats)
 515                 fprintf(f, "repo.max-stats=%s\n",
 516                         cgit_find_stats_periodname(repo->max_stats));
 517         fprintf(f, "\n");
 518 }
 519
 520 void print_repolist(FILE *f, struct cgit_repolist *list, int start)
 521 {
 522         int i;
 523
 524         for(i = start; i < list->count; i++)
 525                 print_repo(f, &list->repos[i]);
 526 }
 527
 528 /* Scan 'path' for git repositories, save the resulting repolist in 'cached_rc'
 529  * and return 0 on success.
 530  */
 531 static int generate_cached_repolist(const char *path, const char *cached_rc)
 532 {
 533         char *locked_rc;
 534         int idx;
 535         FILE *f;
 536
 537         locked_rc = xstrdup(fmt("%s.lock", cached_rc));
 538         f = fopen(locked_rc, "wx");
 539         if (!f) {
 540                 /* Inform about the error unless the lockfile already existed,
 541                  * since that only means we've got concurrent requests.
 542                  */
 543                 if (errno != EEXIST)
 544                         fprintf(stderr, "[cgit] Error opening %s: %s (%d)\n",
 545                                 locked_rc, strerror(errno), errno);
 546                 return errno;
 547         }
 548         idx = cgit_repolist.count;
 549         scan_tree(path, repo_config);
 550         print_repolist(f, &cgit_repolist, idx);
 551         if (rename(locked_rc, cached_rc))
 552                 fprintf(stderr, "[cgit] Error renaming %s to %s: %s (%d)\n",
 553                         locked_rc, cached_rc, strerror(errno), errno);
 554         fclose(f);
 555         return 0;
 556 }
 557
 558 static void process_cached_repolist(const char *path)
 559 {
 560         struct stat st;
 561         char *cached_rc;
 562         time_t age;
 563
 564         cached_rc = xstrdup(fmt("%s/rc-%8x", ctx.cfg.cache_root,
 565                 hash_str(path)));
 566
 567         if (stat(cached_rc, &st)) {
 568                 /* Nothing is cached, we need to scan without forking. And
 569                  * if we fail to generate a cached repolist, we need to
 570                  * invoke scan_tree manually.
 571                  */
 572                 if (generate_cached_repolist(path, cached_rc))
 573                         scan_tree(path, repo_config);
 574                 return;
 575         }
 576
 577         parse_configfile(cached_rc, config_cb);
 578
 579         /* If the cached configfile hasn't expired, lets exit now */
 580         age = time(NULL) - st.st_mtime;
 581         if (age <= (ctx.cfg.cache_scanrc_ttl * 60))
 582                 return;
 583
 584         /* The cached repolist has been parsed, but it was old. So lets
 585          * rescan the specified path and generate a new cached repolist
 586          * in a child-process to avoid latency for the current request.
 587          */
 588         if (fork())
 589                 return;
 590
 591         exit(generate_cached_repolist(path, cached_rc));
 592 }
 593
 594 static void cgit_parse_args(int argc, const char **argv)
 595 {
 596         int i;
 597         int scan = 0;
 598
 599         for (i = 1; i < argc; i++) {
 600                 if (!strncmp(argv[i], "--cache=", 8)) {
 601                         ctx.cfg.cache_root = xstrdup(argv[i]+8);
 602                 }
 603                 if (!strcmp(argv[i], "--nocache")) {
 604                         ctx.cfg.nocache = 1;
 605                 }
 606                 if (!strcmp(argv[i], "--nohttp")) {
 607                         ctx.env.no_http = "1";
 608                 }
 609                 if (!strncmp(argv[i], "--query=", 8)) {
 610                         ctx.qry.raw = xstrdup(argv[i]+8);
 611                 }
 612                 if (!strncmp(argv[i], "--repo=", 7)) {
 613                         ctx.qry.repo = xstrdup(argv[i]+7);
 614                 }
 615                 if (!strncmp(argv[i], "--page=", 7)) {
 616                         ctx.qry.page = xstrdup(argv[i]+7);
 617                 }
 618                 if (!strncmp(argv[i], "--head=", 7)) {
 619                         ctx.qry.head = xstrdup(argv[i]+7);
 620                         ctx.qry.has_symref = 1;
 621                 }
 622                 if (!strncmp(argv[i], "--sha1=", 7)) {
 623                         ctx.qry.sha1 = xstrdup(argv[i]+7);
 624                         ctx.qry.has_sha1 = 1;
 625                 }
 626                 if (!strncmp(argv[i], "--ofs=", 6)) {
 627                         ctx.qry.ofs = atoi(argv[i]+6);
 628                 }
 629                 if (!strncmp(argv[i], "--scan-tree=", 12) ||
 630                     !strncmp(argv[i], "--scan-path=", 12)) {
 631                         /* HACK: the global snapshot bitmask defines the
 632                          * set of allowed snapshot formats, but the config
 633                          * file hasn't been parsed yet so the mask is
 634                          * currently 0. By setting all bits high before
 635                          * scanning we make sure that any in-repo cgitrc
 636                          * snapshot setting is respected by scan_tree().
 637                          * BTW: we assume that there'll never be more than
 638                          * 255 different snapshot formats supported by cgit...
 639                          */
 640                         ctx.cfg.snapshots = 0xFF;
 641                         scan++;
 642                         scan_tree(argv[i] + 12, repo_config);
 643                 }
 644         }
 645         if (scan) {
 646                 qsort(cgit_repolist.repos, cgit_repolist.count,
 647                         sizeof(struct cgit_repo), cmp_repos);
 648                 print_repolist(stdout, &cgit_repolist, 0);
 649                 exit(0);
 650         }
 651 }
 652
 653 static int calc_ttl()
 654 {
 655         if (!ctx.repo)
 656                 return ctx.cfg.cache_root_ttl;
 657
 658         if (!ctx.qry.page)
 659                 return ctx.cfg.cache_repo_ttl;
 660
 661         if (ctx.qry.has_symref)
 662                 return ctx.cfg.cache_dynamic_ttl;
 663
 664         if (ctx.qry.has_sha1)
 665                 return ctx.cfg.cache_static_ttl;
 666
 667         return ctx.cfg.cache_repo_ttl;
 668 }
 669
 670 int main(int argc, const char **argv)
 671 {
 672         const char *path;
 673         char *qry;
 674         int err, ttl;
 675
 676         prepare_context(&ctx);
 677         cgit_repolist.length = 0;
 678         cgit_repolist.count = 0;
 679         cgit_repolist.repos = NULL;
 680
 681         cgit_parse_args(argc, argv);
 682         parse_configfile(ctx.env.cgit_config, config_cb);
 683         ctx.repo = NULL;
 684         http_parse_querystring(ctx.qry.raw, querystring_cb);
 685
 686         /* If virtual-root isn't specified in cgitrc, lets pretend
 687          * that virtual-root equals SCRIPT_NAME.
 688          */
 689         if (!ctx.cfg.virtual_root)
 690                 ctx.cfg.virtual_root = ctx.cfg.script_name;
 691
 692         /* If no url parameter is specified on the querystring, lets
 693          * use PATH_INFO as url. This allows cgit to work with virtual
 694          * urls without the need for rewriterules in the webserver (as
 695          * long as PATH_INFO is included in the cache lookup key).
 696          */
 697         path = ctx.env.path_info;
 698         if (!ctx.qry.url && path) {
 699                 if (path[0] == '/')
 700                         path++;
 701                 ctx.qry.url = xstrdup(path);
 702                 if (ctx.qry.raw) {
 703                         qry = ctx.qry.raw;
 704                         ctx.qry.raw = xstrdup(fmt("%s?%s", path, qry));
 705                         free(qry);
 706                 } else
 707                         ctx.qry.raw = xstrdup(ctx.qry.url);
 708                 cgit_parse_url(ctx.qry.url);
 709         }
 710
 711         ttl = calc_ttl();
 712         ctx.page.expires += ttl*60;
 713         if (ctx.env.request_method && !strcmp(ctx.env.request_method, "HEAD"))
 714                 ctx.cfg.nocache = 1;
 715         if (ctx.cfg.nocache)
 716                 ctx.cfg.cache_size = 0;
 717         err = cache_process(ctx.cfg.cache_size, ctx.cfg.cache_root,
 718                             ctx.qry.raw, ttl, process_request, &ctx);
 719         if (err)
 720                 cgit_print_error(fmt("Error processing page: %s (%d)",
 721                                      strerror(err), err));
 722         return err;
 723 }