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