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, "enable-remote-branches"))
  64                 repo->enable_remote_branches = atoi(value);
  65         else if (!strcmp(name, "max-stats"))
  66                 repo->max_stats = cgit_find_stats_period(value, NULL);
  67         else if (!strcmp(name, "module-link"))
  68                 repo->module_link= xstrdup(value);
  69         else if (!strcmp(name, "section"))
  70                 repo->section = xstrdup(value);
  71         else if (!strcmp(name, "readme") && value != NULL) {
  72                 if (*value == '/')
  73                         repo->readme = xstrdup(value);
  74                 else
  75                         repo->readme = xstrdup(fmt("%s/%s", repo->path, value));
  76         } else if (ctx.cfg.enable_filter_overrides) {
  77                 if (!strcmp(name, "about-filter"))
  78                         repo->about_filter = new_filter(value, 0);
  79                 else if (!strcmp(name, "commit-filter"))
  80                         repo->commit_filter = new_filter(value, 0);
  81                 else if (!strcmp(name, "source-filter"))
  82                         repo->source_filter = new_filter(value, 1);
  83         }
  84 }
  85
  86 void config_cb(const char *name, const char *value)
  87 {
  88         if (!strcmp(name, "section") || !strcmp(name, "repo.group"))
  89                 ctx.cfg.section = xstrdup(value);
  90         else if (!strcmp(name, "repo.url"))
  91                 ctx.repo = cgit_add_repo(value);
  92         else if (ctx.repo && !strcmp(name, "repo.path"))
  93                 ctx.repo->path = trim_end(value, '/');
  94         else if (ctx.repo && !prefixcmp(name, "repo."))
  95                 repo_config(ctx.repo, name + 5, value);
  96         else if (!strcmp(name, "root-title"))
  97                 ctx.cfg.root_title = xstrdup(value);
  98         else if (!strcmp(name, "root-desc"))
  99                 ctx.cfg.root_desc = xstrdup(value);
 100         else if (!strcmp(name, "root-readme"))
 101                 ctx.cfg.root_readme = xstrdup(value);
 102         else if (!strcmp(name, "css"))
 103                 ctx.cfg.css = xstrdup(value);
 104         else if (!strcmp(name, "favicon"))
 105                 ctx.cfg.favicon = xstrdup(value);
 106         else if (!strcmp(name, "footer"))
 107                 ctx.cfg.footer = xstrdup(value);
 108         else if (!strcmp(name, "head-include"))
 109                 ctx.cfg.head_include = xstrdup(value);
 110         else if (!strcmp(name, "header"))
 111                 ctx.cfg.header = xstrdup(value);
 112         else if (!strcmp(name, "logo"))
 113                 ctx.cfg.logo = xstrdup(value);
 114         else if (!strcmp(name, "index-header"))
 115                 ctx.cfg.index_header = xstrdup(value);
 116         else if (!strcmp(name, "index-info"))
 117                 ctx.cfg.index_info = xstrdup(value);
 118         else if (!strcmp(name, "logo-link"))
 119                 ctx.cfg.logo_link = xstrdup(value);
 120         else if (!strcmp(name, "module-link"))
 121                 ctx.cfg.module_link = xstrdup(value);
 122         else if (!strcmp(name, "virtual-root")) {
 123                 ctx.cfg.virtual_root = trim_end(value, '/');
 124                 if (!ctx.cfg.virtual_root && (!strcmp(value, "/")))
 125                         ctx.cfg.virtual_root = "";
 126         } else if (!strcmp(name, "nocache"))
 127                 ctx.cfg.nocache = atoi(value);
 128         else if (!strcmp(name, "noplainemail"))
 129                 ctx.cfg.noplainemail = atoi(value);
 130         else if (!strcmp(name, "noheader"))
 131                 ctx.cfg.noheader = atoi(value);
 132         else if (!strcmp(name, "snapshots"))
 133                 ctx.cfg.snapshots = cgit_parse_snapshots_mask(value);
 134         else if (!strcmp(name, "enable-filter-overrides"))
 135                 ctx.cfg.enable_filter_overrides = atoi(value);
 136         else if (!strcmp(name, "enable-index-links"))
 137                 ctx.cfg.enable_index_links = atoi(value);
 138         else if (!strcmp(name, "enable-log-filecount"))
 139                 ctx.cfg.enable_log_filecount = atoi(value);
 140         else if (!strcmp(name, "enable-log-linecount"))
 141                 ctx.cfg.enable_log_linecount = atoi(value);
 142         else if (!strcmp(name, "enable-remote-branches"))
 143                 ctx.cfg.enable_remote_branches = atoi(value);
 144         else if (!strcmp(name, "enable-tree-linenumbers"))
 145                 ctx.cfg.enable_tree_linenumbers = atoi(value);
 146         else if (!strcmp(name, "max-stats"))
 147                 ctx.cfg.max_stats = cgit_find_stats_period(value, NULL);
 148         else if (!strcmp(name, "cache-size"))
 149                 ctx.cfg.cache_size = atoi(value);
 150         else if (!strcmp(name, "cache-root"))
 151                 ctx.cfg.cache_root = xstrdup(value);
 152         else if (!strcmp(name, "cache-root-ttl"))
 153                 ctx.cfg.cache_root_ttl = atoi(value);
 154         else if (!strcmp(name, "cache-repo-ttl"))
 155                 ctx.cfg.cache_repo_ttl = atoi(value);
 156         else if (!strcmp(name, "cache-scanrc-ttl"))
 157                 ctx.cfg.cache_scanrc_ttl = atoi(value);
 158         else if (!strcmp(name, "cache-static-ttl"))
 159                 ctx.cfg.cache_static_ttl = atoi(value);
 160         else if (!strcmp(name, "cache-dynamic-ttl"))
 161                 ctx.cfg.cache_dynamic_ttl = atoi(value);
 162         else if (!strcmp(name, "about-filter"))
 163                 ctx.cfg.about_filter = new_filter(value, 0);
 164         else if (!strcmp(name, "commit-filter"))
 165                 ctx.cfg.commit_filter = new_filter(value, 0);
 166         else if (!strcmp(name, "embedded"))
 167                 ctx.cfg.embedded = atoi(value);
 168         else if (!strcmp(name, "max-message-length"))
 169                 ctx.cfg.max_msg_len = atoi(value);
 170         else if (!strcmp(name, "max-repodesc-length"))
 171                 ctx.cfg.max_repodesc_len = atoi(value);
 172         else if (!strcmp(name, "max-blob-size"))
 173                 ctx.cfg.max_blob_size = atoi(value);
 174         else if (!strcmp(name, "max-repo-count"))
 175                 ctx.cfg.max_repo_count = atoi(value);
 176         else if (!strcmp(name, "max-commit-count"))
 177                 ctx.cfg.max_commit_count = atoi(value);
 178         else if (!strcmp(name, "scan-path"))
 179                 if (!ctx.cfg.nocache && ctx.cfg.cache_size)
 180                         process_cached_repolist(value);
 181                 else
 182                         scan_tree(value, repo_config);
 183         else if (!strcmp(name, "source-filter"))
 184                 ctx.cfg.source_filter = new_filter(value, 1);
 185         else if (!strcmp(name, "summary-log"))
 186                 ctx.cfg.summary_log = atoi(value);
 187         else if (!strcmp(name, "summary-branches"))
 188                 ctx.cfg.summary_branches = atoi(value);
 189         else if (!strcmp(name, "summary-tags"))
 190                 ctx.cfg.summary_tags = atoi(value);
 191         else if (!strcmp(name, "side-by-side-diffs"))
 192                 ctx.cfg.ssdiff = atoi(value);
 193         else if (!strcmp(name, "agefile"))
 194                 ctx.cfg.agefile = xstrdup(value);
 195         else if (!strcmp(name, "renamelimit"))
 196                 ctx.cfg.renamelimit = atoi(value);
 197         else if (!strcmp(name, "robots"))
 198                 ctx.cfg.robots = xstrdup(value);
 199         else if (!strcmp(name, "clone-prefix"))
 200                 ctx.cfg.clone_prefix = xstrdup(value);
 201         else if (!strcmp(name, "local-time"))
 202                 ctx.cfg.local_time = atoi(value);
 203         else if (!prefixcmp(name, "mimetype."))
 204                 add_mimetype(name + 9, value);
 205         else if (!strcmp(name, "include"))
 206                 parse_configfile(value, config_cb);
 207 }
 208
 209 static void querystring_cb(const char *name, const char *value)
 210 {
 211         if (!value)
 212                 value = "";
 213
 214         if (!strcmp(name,"r")) {
 215                 ctx.qry.repo = xstrdup(value);
 216                 ctx.repo = cgit_get_repoinfo(value);
 217         } else if (!strcmp(name, "p")) {
 218                 ctx.qry.page = xstrdup(value);
 219         } else if (!strcmp(name, "url")) {
 220                 if (*value == '/')
 221                         value++;
 222                 ctx.qry.url = xstrdup(value);
 223                 cgit_parse_url(value);
 224         } else if (!strcmp(name, "qt")) {
 225                 ctx.qry.grep = xstrdup(value);
 226         } else if (!strcmp(name, "q")) {
 227                 ctx.qry.search = xstrdup(value);
 228         } else if (!strcmp(name, "h")) {
 229                 ctx.qry.head = xstrdup(value);
 230                 ctx.qry.has_symref = 1;
 231         } else if (!strcmp(name, "id")) {
 232                 ctx.qry.sha1 = xstrdup(value);
 233                 ctx.qry.has_sha1 = 1;
 234         } else if (!strcmp(name, "id2")) {
 235                 ctx.qry.sha2 = xstrdup(value);
 236                 ctx.qry.has_sha1 = 1;
 237         } else if (!strcmp(name, "ofs")) {
 238                 ctx.qry.ofs = atoi(value);
 239         } else if (!strcmp(name, "path")) {
 240                 ctx.qry.path = trim_end(value, '/');
 241         } else if (!strcmp(name, "name")) {
 242                 ctx.qry.name = xstrdup(value);
 243         } else if (!strcmp(name, "mimetype")) {
 244                 ctx.qry.mimetype = xstrdup(value);
 245         } else if (!strcmp(name, "s")){
 246                 ctx.qry.sort = xstrdup(value);
 247         } else if (!strcmp(name, "showmsg")) {
 248                 ctx.qry.showmsg = atoi(value);
 249         } else if (!strcmp(name, "period")) {
 250                 ctx.qry.period = xstrdup(value);
 251         } else if (!strcmp(name, "ss")) {
 252                 ctx.qry.ssdiff = atoi(value);
 253         }
 254 }
 255
 256 char *xstrdupn(const char *str)
 257 {
 258         return (str ? xstrdup(str) : NULL);
 259 }
 260
 261 static void prepare_context(struct cgit_context *ctx)
 262 {
 263         memset(ctx, 0, sizeof(*ctx));
 264         ctx->cfg.agefile = "info/web/last-modified";
 265         ctx->cfg.nocache = 0;
 266         ctx->cfg.cache_size = 0;
 267         ctx->cfg.cache_dynamic_ttl = 5;
 268         ctx->cfg.cache_max_create_time = 5;
 269         ctx->cfg.cache_repo_ttl = 5;
 270         ctx->cfg.cache_root = CGIT_CACHE_ROOT;
 271         ctx->cfg.cache_root_ttl = 5;
 272         ctx->cfg.cache_scanrc_ttl = 15;
 273         ctx->cfg.cache_static_ttl = -1;
 274         ctx->cfg.css = "/cgit.css";
 275         ctx->cfg.logo = "/cgit.png";
 276         ctx->cfg.local_time = 0;
 277         ctx->cfg.enable_tree_linenumbers = 1;
 278         ctx->cfg.max_repo_count = 50;
 279         ctx->cfg.max_commit_count = 50;
 280         ctx->cfg.max_lock_attempts = 5;
 281         ctx->cfg.max_msg_len = 80;
 282         ctx->cfg.max_repodesc_len = 80;
 283         ctx->cfg.max_blob_size = 0;
 284         ctx->cfg.max_stats = 0;
 285         ctx->cfg.module_link = "./?repo=%s&page=commit&id=%s";
 286         ctx->cfg.renamelimit = -1;
 287         ctx->cfg.robots = "index, nofollow";
 288         ctx->cfg.root_title = "Git repository browser";
 289         ctx->cfg.root_desc = "a fast webinterface for the git dscm";
 290         ctx->cfg.script_name = CGIT_SCRIPT_NAME;
 291         ctx->cfg.section = "";
 292         ctx->cfg.summary_branches = 10;
 293         ctx->cfg.summary_log = 10;
 294         ctx->cfg.summary_tags = 10;
 295         ctx->cfg.ssdiff = 0;
 296         ctx->env.cgit_config = xstrdupn(getenv("CGIT_CONFIG"));
 297         ctx->env.http_host = xstrdupn(getenv("HTTP_HOST"));
 298         ctx->env.https = xstrdupn(getenv("HTTPS"));
 299         ctx->env.no_http = xstrdupn(getenv("NO_HTTP"));
 300         ctx->env.path_info = xstrdupn(getenv("PATH_INFO"));
 301         ctx->env.query_string = xstrdupn(getenv("QUERY_STRING"));
 302         ctx->env.request_method = xstrdupn(getenv("REQUEST_METHOD"));
 303         ctx->env.script_name = xstrdupn(getenv("SCRIPT_NAME"));
 304         ctx->env.server_name = xstrdupn(getenv("SERVER_NAME"));
 305         ctx->env.server_port = xstrdupn(getenv("SERVER_PORT"));
 306         ctx->page.mimetype = "text/html";
 307         ctx->page.charset = PAGE_ENCODING;
 308         ctx->page.filename = NULL;
 309         ctx->page.size = 0;
 310         ctx->page.modified = time(NULL);
 311         ctx->page.expires = ctx->page.modified;
 312         ctx->page.etag = NULL;
 313         memset(&ctx->cfg.mimetypes, 0, sizeof(struct string_list));
 314         if (ctx->env.script_name)
 315                 ctx->cfg.script_name = ctx->env.script_name;
 316         if (ctx->env.query_string)
 317                 ctx->qry.raw = ctx->env.query_string;
 318         if (!ctx->env.cgit_config)
 319                 ctx->env.cgit_config = CGIT_CONFIG;
 320 }
 321
 322 struct refmatch {
 323         char *req_ref;
 324         char *first_ref;
 325         int match;
 326 };
 327
 328 int find_current_ref(const char *refname, const unsigned char *sha1,
 329                      int flags, void *cb_data)
 330 {
 331         struct refmatch *info;
 332
 333         info = (struct refmatch *)cb_data;
 334         if (!strcmp(refname, info->req_ref))
 335                 info->match = 1;
 336         if (!info->first_ref)
 337                 info->first_ref = xstrdup(refname);
 338         return info->match;
 339 }
 340
 341 char *find_default_branch(struct cgit_repo *repo)
 342 {
 343         struct refmatch info;
 344         char *ref;
 345
 346         info.req_ref = repo->defbranch;
 347         info.first_ref = NULL;
 348         info.match = 0;
 349         for_each_branch_ref(find_current_ref, &info);
 350         if (info.match)
 351                 ref = info.req_ref;
 352         else
 353                 ref = info.first_ref;
 354         if (ref)
 355                 ref = xstrdup(ref);
 356         return ref;
 357 }
 358
 359 static int prepare_repo_cmd(struct cgit_context *ctx)
 360 {
 361         char *tmp;
 362         unsigned char sha1[20];
 363         int nongit = 0;
 364
 365         setenv("GIT_DIR", ctx->repo->path, 1);
 366         setup_git_directory_gently(&nongit);
 367         if (nongit) {
 368                 ctx->page.title = fmt("%s - %s", ctx->cfg.root_title,
 369                                       "config error");
 370                 tmp = fmt("Not a git repository: '%s'", ctx->repo->path);
 371                 ctx->repo = NULL;
 372                 cgit_print_http_headers(ctx);
 373                 cgit_print_docstart(ctx);
 374                 cgit_print_pageheader(ctx);
 375                 cgit_print_error(tmp);
 376                 cgit_print_docend();
 377                 return 1;
 378         }
 379         ctx->page.title = fmt("%s - %s", ctx->repo->name, ctx->repo->desc);
 380
 381         if (!ctx->qry.head) {
 382                 ctx->qry.nohead = 1;
 383                 ctx->qry.head = find_default_branch(ctx->repo);
 384                 ctx->repo->defbranch = ctx->qry.head;
 385         }
 386
 387         if (!ctx->qry.head) {
 388                 cgit_print_http_headers(ctx);
 389                 cgit_print_docstart(ctx);
 390                 cgit_print_pageheader(ctx);
 391                 cgit_print_error("Repository seems to be empty");
 392                 cgit_print_docend();
 393                 return 1;
 394         }
 395
 396         if (get_sha1(ctx->qry.head, sha1)) {
 397                 tmp = xstrdup(ctx->qry.head);
 398                 ctx->qry.head = ctx->repo->defbranch;
 399                 ctx->page.status = 404;
 400                 ctx->page.statusmsg = "not found";
 401                 cgit_print_http_headers(ctx);
 402                 cgit_print_docstart(ctx);
 403                 cgit_print_pageheader(ctx);
 404                 cgit_print_error(fmt("Invalid branch: %s", tmp));
 405                 cgit_print_docend();
 406                 return 1;
 407         }
 408         return 0;
 409 }
 410
 411 static void process_request(void *cbdata)
 412 {
 413         struct cgit_context *ctx = cbdata;
 414         struct cgit_cmd *cmd;
 415
 416         cmd = cgit_get_cmd(ctx);
 417         if (!cmd) {
 418                 ctx->page.title = "cgit error";
 419                 cgit_print_http_headers(ctx);
 420                 cgit_print_docstart(ctx);
 421                 cgit_print_pageheader(ctx);
 422                 cgit_print_error("Invalid request");
 423                 cgit_print_docend();
 424                 return;
 425         }
 426
 427         if (cmd->want_repo && !ctx->repo) {
 428                 cgit_print_http_headers(ctx);
 429                 cgit_print_docstart(ctx);
 430                 cgit_print_pageheader(ctx);
 431                 cgit_print_error(fmt("No repository selected"));
 432                 cgit_print_docend();
 433                 return;
 434         }
 435
 436         if (ctx->repo && prepare_repo_cmd(ctx))
 437                 return;
 438
 439         if (cmd->want_layout) {
 440                 cgit_print_http_headers(ctx);
 441                 cgit_print_docstart(ctx);
 442                 cgit_print_pageheader(ctx);
 443         }
 444
 445         cmd->fn(ctx);
 446
 447         if (cmd->want_layout)
 448                 cgit_print_docend();
 449 }
 450
 451 int cmp_repos(const void *a, const void *b)
 452 {
 453         const struct cgit_repo *ra = a, *rb = b;
 454         return strcmp(ra->url, rb->url);
 455 }
 456
 457 char *build_snapshot_setting(int bitmap)
 458 {
 459         const struct cgit_snapshot_format *f;
 460         char *result = xstrdup("");
 461         char *tmp;
 462         int len;
 463
 464         for (f = cgit_snapshot_formats; f->suffix; f++) {
 465                 if (f->bit & bitmap) {
 466                         tmp = result;
 467                         result = xstrdup(fmt("%s%s ", tmp, f->suffix));
 468                         free(tmp);
 469                 }
 470         }
 471         len = strlen(result);
 472         if (len)
 473                 result[len - 1] = '\0';
 474         return result;
 475 }
 476
 477 char *get_first_line(char *txt)
 478 {
 479         char *t = xstrdup(txt);
 480         char *p = strchr(t, '\n');
 481         if (p)
 482                 *p = '\0';
 483         return t;
 484 }
 485
 486 void print_repo(FILE *f, struct cgit_repo *repo)
 487 {
 488         fprintf(f, "repo.url=%s\n", repo->url);
 489         fprintf(f, "repo.name=%s\n", repo->name);
 490         fprintf(f, "repo.path=%s\n", repo->path);
 491         if (repo->owner)
 492                 fprintf(f, "repo.owner=%s\n", repo->owner);
 493         if (repo->desc) {
 494                 char *tmp = get_first_line(repo->desc);
 495                 fprintf(f, "repo.desc=%s\n", tmp);
 496                 free(tmp);
 497         }
 498         if (repo->readme)
 499                 fprintf(f, "repo.readme=%s\n", repo->readme);
 500         if (repo->defbranch)
 501                 fprintf(f, "repo.defbranch=%s\n", repo->defbranch);
 502         if (repo->module_link)
 503                 fprintf(f, "repo.module-link=%s\n", repo->module_link);
 504         if (repo->section)
 505                 fprintf(f, "repo.section=%s\n", repo->section);
 506         if (repo->clone_url)
 507                 fprintf(f, "repo.clone-url=%s\n", repo->clone_url);
 508         fprintf(f, "repo.enable-log-filecount=%d\n",
 509                 repo->enable_log_filecount);
 510         fprintf(f, "repo.enable-log-linecount=%d\n",
 511                 repo->enable_log_linecount);
 512         if (repo->about_filter && repo->about_filter != ctx.cfg.about_filter)
 513                 fprintf(f, "repo.about-filter=%s\n", repo->about_filter->cmd);
 514         if (repo->commit_filter && repo->commit_filter != ctx.cfg.commit_filter)
 515                 fprintf(f, "repo.commit-filter=%s\n", repo->commit_filter->cmd);
 516         if (repo->source_filter && repo->source_filter != ctx.cfg.source_filter)
 517                 fprintf(f, "repo.source-filter=%s\n", repo->source_filter->cmd);
 518         if (repo->snapshots != ctx.cfg.snapshots) {
 519                 char *tmp = build_snapshot_setting(repo->snapshots);
 520                 fprintf(f, "repo.snapshots=%s\n", tmp);
 521                 free(tmp);
 522         }
 523         if (repo->max_stats != ctx.cfg.max_stats)
 524                 fprintf(f, "repo.max-stats=%s\n",
 525                         cgit_find_stats_periodname(repo->max_stats));
 526         fprintf(f, "\n");
 527 }
 528
 529 void print_repolist(FILE *f, struct cgit_repolist *list, int start)
 530 {
 531         int i;
 532
 533         for(i = start; i < list->count; i++)
 534                 print_repo(f, &list->repos[i]);
 535 }
 536
 537 /* Scan 'path' for git repositories, save the resulting repolist in 'cached_rc'
 538  * and return 0 on success.
 539  */
 540 static int generate_cached_repolist(const char *path, const char *cached_rc)
 541 {
 542         char *locked_rc;
 543         int idx;
 544         FILE *f;
 545
 546         locked_rc = xstrdup(fmt("%s.lock", cached_rc));
 547         f = fopen(locked_rc, "wx");
 548         if (!f) {
 549                 /* Inform about the error unless the lockfile already existed,
 550                  * since that only means we've got concurrent requests.
 551                  */
 552                 if (errno != EEXIST)
 553                         fprintf(stderr, "[cgit] Error opening %s: %s (%d)\n",
 554                                 locked_rc, strerror(errno), errno);
 555                 return errno;
 556         }
 557         idx = cgit_repolist.count;
 558         scan_tree(path, repo_config);
 559         print_repolist(f, &cgit_repolist, idx);
 560         if (rename(locked_rc, cached_rc))
 561                 fprintf(stderr, "[cgit] Error renaming %s to %s: %s (%d)\n",
 562                         locked_rc, cached_rc, strerror(errno), errno);
 563         fclose(f);
 564         return 0;
 565 }
 566
 567 static void process_cached_repolist(const char *path)
 568 {
 569         struct stat st;
 570         char *cached_rc;
 571         time_t age;
 572
 573         cached_rc = xstrdup(fmt("%s/rc-%8x", ctx.cfg.cache_root,
 574                 hash_str(path)));
 575
 576         if (stat(cached_rc, &st)) {
 577                 /* Nothing is cached, we need to scan without forking. And
 578                  * if we fail to generate a cached repolist, we need to
 579                  * invoke scan_tree manually.
 580                  */
 581                 if (generate_cached_repolist(path, cached_rc))
 582                         scan_tree(path, repo_config);
 583                 return;
 584         }
 585
 586         parse_configfile(cached_rc, config_cb);
 587
 588         /* If the cached configfile hasn't expired, lets exit now */
 589         age = time(NULL) - st.st_mtime;
 590         if (age <= (ctx.cfg.cache_scanrc_ttl * 60))
 591                 return;
 592
 593         /* The cached repolist has been parsed, but it was old. So lets
 594          * rescan the specified path and generate a new cached repolist
 595          * in a child-process to avoid latency for the current request.
 596          */
 597         if (fork())
 598                 return;
 599
 600         exit(generate_cached_repolist(path, cached_rc));
 601 }
 602
 603 static void cgit_parse_args(int argc, const char **argv)
 604 {
 605         int i;
 606         int scan = 0;
 607
 608         for (i = 1; i < argc; i++) {
 609                 if (!strncmp(argv[i], "--cache=", 8)) {
 610                         ctx.cfg.cache_root = xstrdup(argv[i]+8);
 611                 }
 612                 if (!strcmp(argv[i], "--nocache")) {
 613                         ctx.cfg.nocache = 1;
 614                 }
 615                 if (!strcmp(argv[i], "--nohttp")) {
 616                         ctx.env.no_http = "1";
 617                 }
 618                 if (!strncmp(argv[i], "--query=", 8)) {
 619                         ctx.qry.raw = xstrdup(argv[i]+8);
 620                 }
 621                 if (!strncmp(argv[i], "--repo=", 7)) {
 622                         ctx.qry.repo = xstrdup(argv[i]+7);
 623                 }
 624                 if (!strncmp(argv[i], "--page=", 7)) {
 625                         ctx.qry.page = xstrdup(argv[i]+7);
 626                 }
 627                 if (!strncmp(argv[i], "--head=", 7)) {
 628                         ctx.qry.head = xstrdup(argv[i]+7);
 629                         ctx.qry.has_symref = 1;
 630                 }
 631                 if (!strncmp(argv[i], "--sha1=", 7)) {
 632                         ctx.qry.sha1 = xstrdup(argv[i]+7);
 633                         ctx.qry.has_sha1 = 1;
 634                 }
 635                 if (!strncmp(argv[i], "--ofs=", 6)) {
 636                         ctx.qry.ofs = atoi(argv[i]+6);
 637                 }
 638                 if (!strncmp(argv[i], "--scan-tree=", 12) ||
 639                     !strncmp(argv[i], "--scan-path=", 12)) {
 640                         /* HACK: the global snapshot bitmask defines the
 641                          * set of allowed snapshot formats, but the config
 642                          * file hasn't been parsed yet so the mask is
 643                          * currently 0. By setting all bits high before
 644                          * scanning we make sure that any in-repo cgitrc
 645                          * snapshot setting is respected by scan_tree().
 646                          * BTW: we assume that there'll never be more than
 647                          * 255 different snapshot formats supported by cgit...
 648                          */
 649                         ctx.cfg.snapshots = 0xFF;
 650                         scan++;
 651                         scan_tree(argv[i] + 12, repo_config);
 652                 }
 653         }
 654         if (scan) {
 655                 qsort(cgit_repolist.repos, cgit_repolist.count,
 656                         sizeof(struct cgit_repo), cmp_repos);
 657                 print_repolist(stdout, &cgit_repolist, 0);
 658                 exit(0);
 659         }
 660 }
 661
 662 static int calc_ttl()
 663 {
 664         if (!ctx.repo)
 665                 return ctx.cfg.cache_root_ttl;
 666
 667         if (!ctx.qry.page)
 668                 return ctx.cfg.cache_repo_ttl;
 669
 670         if (ctx.qry.has_symref)
 671                 return ctx.cfg.cache_dynamic_ttl;
 672
 673         if (ctx.qry.has_sha1)
 674                 return ctx.cfg.cache_static_ttl;
 675
 676         return ctx.cfg.cache_repo_ttl;
 677 }
 678
 679 int main(int argc, const char **argv)
 680 {
 681         const char *path;
 682         char *qry;
 683         int err, ttl;
 684
 685         prepare_context(&ctx);
 686         cgit_repolist.length = 0;
 687         cgit_repolist.count = 0;
 688         cgit_repolist.repos = NULL;
 689
 690         cgit_parse_args(argc, argv);
 691         parse_configfile(ctx.env.cgit_config, config_cb);
 692         ctx.repo = NULL;
 693         http_parse_querystring(ctx.qry.raw, querystring_cb);
 694
 695         /* If virtual-root isn't specified in cgitrc, lets pretend
 696          * that virtual-root equals SCRIPT_NAME.
 697          */
 698         if (!ctx.cfg.virtual_root)
 699                 ctx.cfg.virtual_root = ctx.cfg.script_name;
 700
 701         /* If no url parameter is specified on the querystring, lets
 702          * use PATH_INFO as url. This allows cgit to work with virtual
 703          * urls without the need for rewriterules in the webserver (as
 704          * long as PATH_INFO is included in the cache lookup key).
 705          */
 706         path = ctx.env.path_info;
 707         if (!ctx.qry.url && path) {
 708                 if (path[0] == '/')
 709                         path++;
 710                 ctx.qry.url = xstrdup(path);
 711                 if (ctx.qry.raw) {
 712                         qry = ctx.qry.raw;
 713                         ctx.qry.raw = xstrdup(fmt("%s?%s", path, qry));
 714                         free(qry);
 715                 } else
 716                         ctx.qry.raw = xstrdup(ctx.qry.url);
 717                 cgit_parse_url(ctx.qry.url);
 718         }
 719
 720         ttl = calc_ttl();
 721         ctx.page.expires += ttl*60;
 722         if (ctx.env.request_method && !strcmp(ctx.env.request_method, "HEAD"))
 723                 ctx.cfg.nocache = 1;
 724         if (ctx.cfg.nocache)
 725                 ctx.cfg.cache_size = 0;
 726         err = cache_process(ctx.cfg.cache_size, ctx.cfg.cache_root,
 727                             ctx.qry.raw, ttl, process_request, &ctx);
 728         if (err)
 729                 cgit_print_error(fmt("Error processing page: %s (%d)",
 730                                      strerror(err), err));
 731         return err;
 732 }