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, "enable-subject-links"))
  66                 repo->enable_subject_links = atoi(value);
  67         else if (!strcmp(name, "max-stats"))
  68                 repo->max_stats = cgit_find_stats_period(value, NULL);
  69         else if (!strcmp(name, "module-link"))
  70                 repo->module_link= xstrdup(value);
  71         else if (!strcmp(name, "section"))
  72                 repo->section = xstrdup(value);
  73         else if (!strcmp(name, "readme") && value != NULL) {
  74                 if (*value == '/')
  75                         repo->readme = xstrdup(value);
  76                 else
  77                         repo->readme = xstrdup(fmt("%s/%s", repo->path, value));
  78         } else if (ctx.cfg.enable_filter_overrides) {
  79                 if (!strcmp(name, "about-filter"))
  80                         repo->about_filter = new_filter(value, 0);
  81                 else if (!strcmp(name, "commit-filter"))
  82                         repo->commit_filter = new_filter(value, 0);
  83                 else if (!strcmp(name, "source-filter"))
  84                         repo->source_filter = new_filter(value, 1);
  85         }
  86 }
  87
  88 void config_cb(const char *name, const char *value)
  89 {
  90         if (!strcmp(name, "section") || !strcmp(name, "repo.group"))
  91                 ctx.cfg.section = xstrdup(value);
  92         else if (!strcmp(name, "repo.url"))
  93                 ctx.repo = cgit_add_repo(value);
  94         else if (ctx.repo && !strcmp(name, "repo.path"))
  95                 ctx.repo->path = trim_end(value, '/');
  96         else if (ctx.repo && !prefixcmp(name, "repo."))
  97                 repo_config(ctx.repo, name + 5, value);
  98         else if (!strcmp(name, "root-title"))
  99                 ctx.cfg.root_title = xstrdup(value);
 100         else if (!strcmp(name, "root-desc"))
 101                 ctx.cfg.root_desc = xstrdup(value);
 102         else if (!strcmp(name, "root-readme"))
 103                 ctx.cfg.root_readme = xstrdup(value);
 104         else if (!strcmp(name, "css"))
 105                 ctx.cfg.css = xstrdup(value);
 106         else if (!strcmp(name, "favicon"))
 107                 ctx.cfg.favicon = xstrdup(value);
 108         else if (!strcmp(name, "footer"))
 109                 ctx.cfg.footer = xstrdup(value);
 110         else if (!strcmp(name, "head-include"))
 111                 ctx.cfg.head_include = xstrdup(value);
 112         else if (!strcmp(name, "header"))
 113                 ctx.cfg.header = xstrdup(value);
 114         else if (!strcmp(name, "logo"))
 115                 ctx.cfg.logo = xstrdup(value);
 116         else if (!strcmp(name, "index-header"))
 117                 ctx.cfg.index_header = xstrdup(value);
 118         else if (!strcmp(name, "index-info"))
 119                 ctx.cfg.index_info = xstrdup(value);
 120         else if (!strcmp(name, "logo-link"))
 121                 ctx.cfg.logo_link = xstrdup(value);
 122         else if (!strcmp(name, "module-link"))
 123                 ctx.cfg.module_link = xstrdup(value);
 124         else if (!strcmp(name, "virtual-root")) {
 125                 ctx.cfg.virtual_root = trim_end(value, '/');
 126                 if (!ctx.cfg.virtual_root && (!strcmp(value, "/")))
 127                         ctx.cfg.virtual_root = "";
 128         } else if (!strcmp(name, "nocache"))
 129                 ctx.cfg.nocache = atoi(value);
 130         else if (!strcmp(name, "noplainemail"))
 131                 ctx.cfg.noplainemail = atoi(value);
 132         else if (!strcmp(name, "noheader"))
 133                 ctx.cfg.noheader = atoi(value);
 134         else if (!strcmp(name, "snapshots"))
 135                 ctx.cfg.snapshots = cgit_parse_snapshots_mask(value);
 136         else if (!strcmp(name, "enable-filter-overrides"))
 137                 ctx.cfg.enable_filter_overrides = atoi(value);
 138         else if (!strcmp(name, "enable-index-links"))
 139                 ctx.cfg.enable_index_links = atoi(value);
 140         else if (!strcmp(name, "enable-log-filecount"))
 141                 ctx.cfg.enable_log_filecount = atoi(value);
 142         else if (!strcmp(name, "enable-log-linecount"))
 143                 ctx.cfg.enable_log_linecount = atoi(value);
 144         else if (!strcmp(name, "enable-remote-branches"))
 145                 ctx.cfg.enable_remote_branches = atoi(value);
 146         else if (!strcmp(name, "enable-subject-links"))
 147                 ctx.cfg.enable_subject_links = atoi(value);
 148         else if (!strcmp(name, "enable-tree-linenumbers"))
 149                 ctx.cfg.enable_tree_linenumbers = atoi(value);
 150         else if (!strcmp(name, "max-stats"))
 151                 ctx.cfg.max_stats = cgit_find_stats_period(value, NULL);
 152         else if (!strcmp(name, "cache-size"))
 153                 ctx.cfg.cache_size = atoi(value);
 154         else if (!strcmp(name, "cache-root"))
 155                 ctx.cfg.cache_root = xstrdup(value);
 156         else if (!strcmp(name, "cache-root-ttl"))
 157                 ctx.cfg.cache_root_ttl = atoi(value);
 158         else if (!strcmp(name, "cache-repo-ttl"))
 159                 ctx.cfg.cache_repo_ttl = atoi(value);
 160         else if (!strcmp(name, "cache-scanrc-ttl"))
 161                 ctx.cfg.cache_scanrc_ttl = atoi(value);
 162         else if (!strcmp(name, "cache-static-ttl"))
 163                 ctx.cfg.cache_static_ttl = atoi(value);
 164         else if (!strcmp(name, "cache-dynamic-ttl"))
 165                 ctx.cfg.cache_dynamic_ttl = atoi(value);
 166         else if (!strcmp(name, "about-filter"))
 167                 ctx.cfg.about_filter = new_filter(value, 0);
 168         else if (!strcmp(name, "commit-filter"))
 169                 ctx.cfg.commit_filter = new_filter(value, 0);
 170         else if (!strcmp(name, "embedded"))
 171                 ctx.cfg.embedded = atoi(value);
 172         else if (!strcmp(name, "max-atom-items"))
 173                 ctx.cfg.max_atom_items = atoi(value);
 174         else if (!strcmp(name, "max-message-length"))
 175                 ctx.cfg.max_msg_len = atoi(value);
 176         else if (!strcmp(name, "max-repodesc-length"))
 177                 ctx.cfg.max_repodesc_len = atoi(value);
 178         else if (!strcmp(name, "max-blob-size"))
 179                 ctx.cfg.max_blob_size = atoi(value);
 180         else if (!strcmp(name, "max-repo-count"))
 181                 ctx.cfg.max_repo_count = atoi(value);
 182         else if (!strcmp(name, "max-commit-count"))
 183                 ctx.cfg.max_commit_count = atoi(value);
 184         else if (!strcmp(name, "scan-path"))
 185                 if (!ctx.cfg.nocache && ctx.cfg.cache_size)
 186                         process_cached_repolist(value);
 187                 else
 188                         scan_tree(value, repo_config);
 189         else if (!strcmp(name, "source-filter"))
 190                 ctx.cfg.source_filter = new_filter(value, 1);
 191         else if (!strcmp(name, "summary-log"))
 192                 ctx.cfg.summary_log = atoi(value);
 193         else if (!strcmp(name, "summary-branches"))
 194                 ctx.cfg.summary_branches = atoi(value);
 195         else if (!strcmp(name, "summary-tags"))
 196                 ctx.cfg.summary_tags = atoi(value);
 197         else if (!strcmp(name, "side-by-side-diffs"))
 198                 ctx.cfg.ssdiff = atoi(value);
 199         else if (!strcmp(name, "agefile"))
 200                 ctx.cfg.agefile = xstrdup(value);
 201         else if (!strcmp(name, "renamelimit"))
 202                 ctx.cfg.renamelimit = atoi(value);
 203         else if (!strcmp(name, "robots"))
 204                 ctx.cfg.robots = xstrdup(value);
 205         else if (!strcmp(name, "clone-prefix"))
 206                 ctx.cfg.clone_prefix = xstrdup(value);
 207         else if (!strcmp(name, "local-time"))
 208                 ctx.cfg.local_time = atoi(value);
 209         else if (!prefixcmp(name, "mimetype."))
 210                 add_mimetype(name + 9, value);
 211         else if (!strcmp(name, "include"))
 212                 parse_configfile(value, config_cb);
 213 }
 214
 215 static void querystring_cb(const char *name, const char *value)
 216 {
 217         if (!value)
 218                 value = "";
 219
 220         if (!strcmp(name,"r")) {
 221                 ctx.qry.repo = xstrdup(value);
 222                 ctx.repo = cgit_get_repoinfo(value);
 223         } else if (!strcmp(name, "p")) {
 224                 ctx.qry.page = xstrdup(value);
 225         } else if (!strcmp(name, "url")) {
 226                 if (*value == '/')
 227                         value++;
 228                 ctx.qry.url = xstrdup(value);
 229                 cgit_parse_url(value);
 230         } else if (!strcmp(name, "qt")) {
 231                 ctx.qry.grep = xstrdup(value);
 232         } else if (!strcmp(name, "q")) {
 233                 ctx.qry.search = xstrdup(value);
 234         } else if (!strcmp(name, "h")) {
 235                 ctx.qry.head = xstrdup(value);
 236                 ctx.qry.has_symref = 1;
 237         } else if (!strcmp(name, "id")) {
 238                 ctx.qry.sha1 = xstrdup(value);
 239                 ctx.qry.has_sha1 = 1;
 240         } else if (!strcmp(name, "id2")) {
 241                 ctx.qry.sha2 = xstrdup(value);
 242                 ctx.qry.has_sha1 = 1;
 243         } else if (!strcmp(name, "ofs")) {
 244                 ctx.qry.ofs = atoi(value);
 245         } else if (!strcmp(name, "path")) {
 246                 ctx.qry.path = trim_end(value, '/');
 247         } else if (!strcmp(name, "name")) {
 248                 ctx.qry.name = xstrdup(value);
 249         } else if (!strcmp(name, "mimetype")) {
 250                 ctx.qry.mimetype = xstrdup(value);
 251         } else if (!strcmp(name, "s")){
 252                 ctx.qry.sort = xstrdup(value);
 253         } else if (!strcmp(name, "showmsg")) {
 254                 ctx.qry.showmsg = atoi(value);
 255         } else if (!strcmp(name, "period")) {
 256                 ctx.qry.period = xstrdup(value);
 257         } else if (!strcmp(name, "ss")) {
 258                 ctx.qry.ssdiff = atoi(value);
 259         } else if (!strcmp(name, "all")) {
 260                 ctx.qry.show_all = atoi(value);
 261         }
 262 }
 263
 264 char *xstrdupn(const char *str)
 265 {
 266         return (str ? xstrdup(str) : NULL);
 267 }
 268
 269 static void prepare_context(struct cgit_context *ctx)
 270 {
 271         memset(ctx, 0, sizeof(*ctx));
 272         ctx->cfg.agefile = "info/web/last-modified";
 273         ctx->cfg.nocache = 0;
 274         ctx->cfg.cache_size = 0;
 275         ctx->cfg.cache_dynamic_ttl = 5;
 276         ctx->cfg.cache_max_create_time = 5;
 277         ctx->cfg.cache_repo_ttl = 5;
 278         ctx->cfg.cache_root = CGIT_CACHE_ROOT;
 279         ctx->cfg.cache_root_ttl = 5;
 280         ctx->cfg.cache_scanrc_ttl = 15;
 281         ctx->cfg.cache_static_ttl = -1;
 282         ctx->cfg.css = "/cgit.css";
 283         ctx->cfg.logo = "/cgit.png";
 284         ctx->cfg.local_time = 0;
 285         ctx->cfg.enable_tree_linenumbers = 1;
 286         ctx->cfg.max_repo_count = 50;
 287         ctx->cfg.max_commit_count = 50;
 288         ctx->cfg.max_lock_attempts = 5;
 289         ctx->cfg.max_msg_len = 80;
 290         ctx->cfg.max_repodesc_len = 80;
 291         ctx->cfg.max_blob_size = 0;
 292         ctx->cfg.max_stats = 0;
 293         ctx->cfg.module_link = "./?repo=%s&page=commit&id=%s";
 294         ctx->cfg.renamelimit = -1;
 295         ctx->cfg.robots = "index, nofollow";
 296         ctx->cfg.root_title = "Git repository browser";
 297         ctx->cfg.root_desc = "a fast webinterface for the git dscm";
 298         ctx->cfg.script_name = CGIT_SCRIPT_NAME;
 299         ctx->cfg.section = "";
 300         ctx->cfg.summary_branches = 10;
 301         ctx->cfg.summary_log = 10;
 302         ctx->cfg.summary_tags = 10;
 303         ctx->cfg.max_atom_items = 10;
 304         ctx->cfg.ssdiff = 0;
 305         ctx->env.cgit_config = xstrdupn(getenv("CGIT_CONFIG"));
 306         ctx->env.http_host = xstrdupn(getenv("HTTP_HOST"));
 307         ctx->env.https = xstrdupn(getenv("HTTPS"));
 308         ctx->env.no_http = xstrdupn(getenv("NO_HTTP"));
 309         ctx->env.path_info = xstrdupn(getenv("PATH_INFO"));
 310         ctx->env.query_string = xstrdupn(getenv("QUERY_STRING"));
 311         ctx->env.request_method = xstrdupn(getenv("REQUEST_METHOD"));
 312         ctx->env.script_name = xstrdupn(getenv("SCRIPT_NAME"));
 313         ctx->env.server_name = xstrdupn(getenv("SERVER_NAME"));
 314         ctx->env.server_port = xstrdupn(getenv("SERVER_PORT"));
 315         ctx->page.mimetype = "text/html";
 316         ctx->page.charset = PAGE_ENCODING;
 317         ctx->page.filename = NULL;
 318         ctx->page.size = 0;
 319         ctx->page.modified = time(NULL);
 320         ctx->page.expires = ctx->page.modified;
 321         ctx->page.etag = NULL;
 322         memset(&ctx->cfg.mimetypes, 0, sizeof(struct string_list));
 323         if (ctx->env.script_name)
 324                 ctx->cfg.script_name = ctx->env.script_name;
 325         if (ctx->env.query_string)
 326                 ctx->qry.raw = ctx->env.query_string;
 327         if (!ctx->env.cgit_config)
 328                 ctx->env.cgit_config = CGIT_CONFIG;
 329 }
 330
 331 struct refmatch {
 332         char *req_ref;
 333         char *first_ref;
 334         int match;
 335 };
 336
 337 int find_current_ref(const char *refname, const unsigned char *sha1,
 338                      int flags, void *cb_data)
 339 {
 340         struct refmatch *info;
 341
 342         info = (struct refmatch *)cb_data;
 343         if (!strcmp(refname, info->req_ref))
 344                 info->match = 1;
 345         if (!info->first_ref)
 346                 info->first_ref = xstrdup(refname);
 347         return info->match;
 348 }
 349
 350 char *find_default_branch(struct cgit_repo *repo)
 351 {
 352         struct refmatch info;
 353         char *ref;
 354
 355         info.req_ref = repo->defbranch;
 356         info.first_ref = NULL;
 357         info.match = 0;
 358         for_each_branch_ref(find_current_ref, &info);
 359         if (info.match)
 360                 ref = info.req_ref;
 361         else
 362                 ref = info.first_ref;
 363         if (ref)
 364                 ref = xstrdup(ref);
 365         return ref;
 366 }
 367
 368 static int prepare_repo_cmd(struct cgit_context *ctx)
 369 {
 370         char *tmp;
 371         unsigned char sha1[20];
 372         int nongit = 0;
 373
 374         setenv("GIT_DIR", ctx->repo->path, 1);
 375         setup_git_directory_gently(&nongit);
 376         if (nongit) {
 377                 ctx->page.title = fmt("%s - %s", ctx->cfg.root_title,
 378                                       "config error");
 379                 tmp = fmt("Not a git repository: '%s'", ctx->repo->path);
 380                 ctx->repo = NULL;
 381                 cgit_print_http_headers(ctx);
 382                 cgit_print_docstart(ctx);
 383                 cgit_print_pageheader(ctx);
 384                 cgit_print_error(tmp);
 385                 cgit_print_docend();
 386                 return 1;
 387         }
 388         ctx->page.title = fmt("%s - %s", ctx->repo->name, ctx->repo->desc);
 389
 390         if (!ctx->qry.head) {
 391                 ctx->qry.nohead = 1;
 392                 ctx->qry.head = find_default_branch(ctx->repo);
 393                 ctx->repo->defbranch = ctx->qry.head;
 394         }
 395
 396         if (!ctx->qry.head) {
 397                 cgit_print_http_headers(ctx);
 398                 cgit_print_docstart(ctx);
 399                 cgit_print_pageheader(ctx);
 400                 cgit_print_error("Repository seems to be empty");
 401                 cgit_print_docend();
 402                 return 1;
 403         }
 404
 405         if (get_sha1(ctx->qry.head, sha1)) {
 406                 tmp = xstrdup(ctx->qry.head);
 407                 ctx->qry.head = ctx->repo->defbranch;
 408                 ctx->page.status = 404;
 409                 ctx->page.statusmsg = "not found";
 410                 cgit_print_http_headers(ctx);
 411                 cgit_print_docstart(ctx);
 412                 cgit_print_pageheader(ctx);
 413                 cgit_print_error(fmt("Invalid branch: %s", tmp));
 414                 cgit_print_docend();
 415                 return 1;
 416         }
 417         return 0;
 418 }
 419
 420 static void process_request(void *cbdata)
 421 {
 422         struct cgit_context *ctx = cbdata;
 423         struct cgit_cmd *cmd;
 424
 425         cmd = cgit_get_cmd(ctx);
 426         if (!cmd) {
 427                 ctx->page.title = "cgit error";
 428                 cgit_print_http_headers(ctx);
 429                 cgit_print_docstart(ctx);
 430                 cgit_print_pageheader(ctx);
 431                 cgit_print_error("Invalid request");
 432                 cgit_print_docend();
 433                 return;
 434         }
 435
 436         /* If cmd->want_vpath is set, assume ctx->qry.path contains a "virtual"
 437          * in-project path limit to be made available at ctx->qry.vpath.
 438          * Otherwise, no path limit is in effect (ctx->qry.vpath = NULL).
 439          */
 440         ctx->qry.vpath = cmd->want_vpath ? ctx->qry.path : NULL;
 441
 442         if (cmd->want_repo && !ctx->repo) {
 443                 cgit_print_http_headers(ctx);
 444                 cgit_print_docstart(ctx);
 445                 cgit_print_pageheader(ctx);
 446                 cgit_print_error(fmt("No repository selected"));
 447                 cgit_print_docend();
 448                 return;
 449         }
 450
 451         if (ctx->repo && prepare_repo_cmd(ctx))
 452                 return;
 453
 454         if (cmd->want_layout) {
 455                 cgit_print_http_headers(ctx);
 456                 cgit_print_docstart(ctx);
 457                 cgit_print_pageheader(ctx);
 458         }
 459
 460         cmd->fn(ctx);
 461
 462         if (cmd->want_layout)
 463                 cgit_print_docend();
 464 }
 465
 466 int cmp_repos(const void *a, const void *b)
 467 {
 468         const struct cgit_repo *ra = a, *rb = b;
 469         return strcmp(ra->url, rb->url);
 470 }
 471
 472 char *build_snapshot_setting(int bitmap)
 473 {
 474         const struct cgit_snapshot_format *f;
 475         char *result = xstrdup("");
 476         char *tmp;
 477         int len;
 478
 479         for (f = cgit_snapshot_formats; f->suffix; f++) {
 480                 if (f->bit & bitmap) {
 481                         tmp = result;
 482                         result = xstrdup(fmt("%s%s ", tmp, f->suffix));
 483                         free(tmp);
 484                 }
 485         }
 486         len = strlen(result);
 487         if (len)
 488                 result[len - 1] = '\0';
 489         return result;
 490 }
 491
 492 char *get_first_line(char *txt)
 493 {
 494         char *t = xstrdup(txt);
 495         char *p = strchr(t, '\n');
 496         if (p)
 497                 *p = '\0';
 498         return t;
 499 }
 500
 501 void print_repo(FILE *f, struct cgit_repo *repo)
 502 {
 503         fprintf(f, "repo.url=%s\n", repo->url);
 504         fprintf(f, "repo.name=%s\n", repo->name);
 505         fprintf(f, "repo.path=%s\n", repo->path);
 506         if (repo->owner)
 507                 fprintf(f, "repo.owner=%s\n", repo->owner);
 508         if (repo->desc) {
 509                 char *tmp = get_first_line(repo->desc);
 510                 fprintf(f, "repo.desc=%s\n", tmp);
 511                 free(tmp);
 512         }
 513         if (repo->readme)
 514                 fprintf(f, "repo.readme=%s\n", repo->readme);
 515         if (repo->defbranch)
 516                 fprintf(f, "repo.defbranch=%s\n", repo->defbranch);
 517         if (repo->module_link)
 518                 fprintf(f, "repo.module-link=%s\n", repo->module_link);
 519         if (repo->section)
 520                 fprintf(f, "repo.section=%s\n", repo->section);
 521         if (repo->clone_url)
 522                 fprintf(f, "repo.clone-url=%s\n", repo->clone_url);
 523         fprintf(f, "repo.enable-log-filecount=%d\n",
 524                 repo->enable_log_filecount);
 525         fprintf(f, "repo.enable-log-linecount=%d\n",
 526                 repo->enable_log_linecount);
 527         if (repo->about_filter && repo->about_filter != ctx.cfg.about_filter)
 528                 fprintf(f, "repo.about-filter=%s\n", repo->about_filter->cmd);
 529         if (repo->commit_filter && repo->commit_filter != ctx.cfg.commit_filter)
 530                 fprintf(f, "repo.commit-filter=%s\n", repo->commit_filter->cmd);
 531         if (repo->source_filter && repo->source_filter != ctx.cfg.source_filter)
 532                 fprintf(f, "repo.source-filter=%s\n", repo->source_filter->cmd);
 533         if (repo->snapshots != ctx.cfg.snapshots) {
 534                 char *tmp = build_snapshot_setting(repo->snapshots);
 535                 fprintf(f, "repo.snapshots=%s\n", tmp);
 536                 free(tmp);
 537         }
 538         if (repo->max_stats != ctx.cfg.max_stats)
 539                 fprintf(f, "repo.max-stats=%s\n",
 540                         cgit_find_stats_periodname(repo->max_stats));
 541         fprintf(f, "\n");
 542 }
 543
 544 void print_repolist(FILE *f, struct cgit_repolist *list, int start)
 545 {
 546         int i;
 547
 548         for(i = start; i < list->count; i++)
 549                 print_repo(f, &list->repos[i]);
 550 }
 551
 552 /* Scan 'path' for git repositories, save the resulting repolist in 'cached_rc'
 553  * and return 0 on success.
 554  */
 555 static int generate_cached_repolist(const char *path, const char *cached_rc)
 556 {
 557         char *locked_rc;
 558         int idx;
 559         FILE *f;
 560
 561         locked_rc = xstrdup(fmt("%s.lock", cached_rc));
 562         f = fopen(locked_rc, "wx");
 563         if (!f) {
 564                 /* Inform about the error unless the lockfile already existed,
 565                  * since that only means we've got concurrent requests.
 566                  */
 567                 if (errno != EEXIST)
 568                         fprintf(stderr, "[cgit] Error opening %s: %s (%d)\n",
 569                                 locked_rc, strerror(errno), errno);
 570                 return errno;
 571         }
 572         idx = cgit_repolist.count;
 573         scan_tree(path, repo_config);
 574         print_repolist(f, &cgit_repolist, idx);
 575         if (rename(locked_rc, cached_rc))
 576                 fprintf(stderr, "[cgit] Error renaming %s to %s: %s (%d)\n",
 577                         locked_rc, cached_rc, strerror(errno), errno);
 578         fclose(f);
 579         return 0;
 580 }
 581
 582 static void process_cached_repolist(const char *path)
 583 {
 584         struct stat st;
 585         char *cached_rc;
 586         time_t age;
 587
 588         cached_rc = xstrdup(fmt("%s/rc-%8x", ctx.cfg.cache_root,
 589                 hash_str(path)));
 590
 591         if (stat(cached_rc, &st)) {
 592                 /* Nothing is cached, we need to scan without forking. And
 593                  * if we fail to generate a cached repolist, we need to
 594                  * invoke scan_tree manually.
 595                  */
 596                 if (generate_cached_repolist(path, cached_rc))
 597                         scan_tree(path, repo_config);
 598                 return;
 599         }
 600
 601         parse_configfile(cached_rc, config_cb);
 602
 603         /* If the cached configfile hasn't expired, lets exit now */
 604         age = time(NULL) - st.st_mtime;
 605         if (age <= (ctx.cfg.cache_scanrc_ttl * 60))
 606                 return;
 607
 608         /* The cached repolist has been parsed, but it was old. So lets
 609          * rescan the specified path and generate a new cached repolist
 610          * in a child-process to avoid latency for the current request.
 611          */
 612         if (fork())
 613                 return;
 614
 615         exit(generate_cached_repolist(path, cached_rc));
 616 }
 617
 618 static void cgit_parse_args(int argc, const char **argv)
 619 {
 620         int i;
 621         int scan = 0;
 622
 623         for (i = 1; i < argc; i++) {
 624                 if (!strncmp(argv[i], "--cache=", 8)) {
 625                         ctx.cfg.cache_root = xstrdup(argv[i]+8);
 626                 }
 627                 if (!strcmp(argv[i], "--nocache")) {
 628                         ctx.cfg.nocache = 1;
 629                 }
 630                 if (!strcmp(argv[i], "--nohttp")) {
 631                         ctx.env.no_http = "1";
 632                 }
 633                 if (!strncmp(argv[i], "--query=", 8)) {
 634                         ctx.qry.raw = xstrdup(argv[i]+8);
 635                 }
 636                 if (!strncmp(argv[i], "--repo=", 7)) {
 637                         ctx.qry.repo = xstrdup(argv[i]+7);
 638                 }
 639                 if (!strncmp(argv[i], "--page=", 7)) {
 640                         ctx.qry.page = xstrdup(argv[i]+7);
 641                 }
 642                 if (!strncmp(argv[i], "--head=", 7)) {
 643                         ctx.qry.head = xstrdup(argv[i]+7);
 644                         ctx.qry.has_symref = 1;
 645                 }
 646                 if (!strncmp(argv[i], "--sha1=", 7)) {
 647                         ctx.qry.sha1 = xstrdup(argv[i]+7);
 648                         ctx.qry.has_sha1 = 1;
 649                 }
 650                 if (!strncmp(argv[i], "--ofs=", 6)) {
 651                         ctx.qry.ofs = atoi(argv[i]+6);
 652                 }
 653                 if (!strncmp(argv[i], "--scan-tree=", 12) ||
 654                     !strncmp(argv[i], "--scan-path=", 12)) {
 655                         /* HACK: the global snapshot bitmask defines the
 656                          * set of allowed snapshot formats, but the config
 657                          * file hasn't been parsed yet so the mask is
 658                          * currently 0. By setting all bits high before
 659                          * scanning we make sure that any in-repo cgitrc
 660                          * snapshot setting is respected by scan_tree().
 661                          * BTW: we assume that there'll never be more than
 662                          * 255 different snapshot formats supported by cgit...
 663                          */
 664                         ctx.cfg.snapshots = 0xFF;
 665                         scan++;
 666                         scan_tree(argv[i] + 12, repo_config);
 667                 }
 668         }
 669         if (scan) {
 670                 qsort(cgit_repolist.repos, cgit_repolist.count,
 671                         sizeof(struct cgit_repo), cmp_repos);
 672                 print_repolist(stdout, &cgit_repolist, 0);
 673                 exit(0);
 674         }
 675 }
 676
 677 static int calc_ttl()
 678 {
 679         if (!ctx.repo)
 680                 return ctx.cfg.cache_root_ttl;
 681
 682         if (!ctx.qry.page)
 683                 return ctx.cfg.cache_repo_ttl;
 684
 685         if (ctx.qry.has_symref)
 686                 return ctx.cfg.cache_dynamic_ttl;
 687
 688         if (ctx.qry.has_sha1)
 689                 return ctx.cfg.cache_static_ttl;
 690
 691         return ctx.cfg.cache_repo_ttl;
 692 }
 693
 694 int main(int argc, const char **argv)
 695 {
 696         const char *path;
 697         char *qry;
 698         int err, ttl;
 699
 700         prepare_context(&ctx);
 701         cgit_repolist.length = 0;
 702         cgit_repolist.count = 0;
 703         cgit_repolist.repos = NULL;
 704
 705         cgit_parse_args(argc, argv);
 706         parse_configfile(ctx.env.cgit_config, config_cb);
 707         ctx.repo = NULL;
 708         http_parse_querystring(ctx.qry.raw, querystring_cb);
 709
 710         /* If virtual-root isn't specified in cgitrc, lets pretend
 711          * that virtual-root equals SCRIPT_NAME.
 712          */
 713         if (!ctx.cfg.virtual_root)
 714                 ctx.cfg.virtual_root = ctx.cfg.script_name;
 715
 716         /* If no url parameter is specified on the querystring, lets
 717          * use PATH_INFO as url. This allows cgit to work with virtual
 718          * urls without the need for rewriterules in the webserver (as
 719          * long as PATH_INFO is included in the cache lookup key).
 720          */
 721         path = ctx.env.path_info;
 722         if (!ctx.qry.url && path) {
 723                 if (path[0] == '/')
 724                         path++;
 725                 ctx.qry.url = xstrdup(path);
 726                 if (ctx.qry.raw) {
 727                         qry = ctx.qry.raw;
 728                         ctx.qry.raw = xstrdup(fmt("%s?%s", path, qry));
 729                         free(qry);
 730                 } else
 731                         ctx.qry.raw = xstrdup(ctx.qry.url);
 732                 cgit_parse_url(ctx.qry.url);
 733         }
 734
 735         ttl = calc_ttl();
 736         ctx.page.expires += ttl*60;
 737         if (ctx.env.request_method && !strcmp(ctx.env.request_method, "HEAD"))
 738                 ctx.cfg.nocache = 1;
 739         if (ctx.cfg.nocache)
 740                 ctx.cfg.cache_size = 0;
 741         err = cache_process(ctx.cfg.cache_size, ctx.cfg.cache_root,
 742                             ctx.qry.raw, ttl, process_request, &ctx);
 743         if (err)
 744                 cgit_print_error(fmt("Error processing page: %s (%d)",
 745                                      strerror(err), err));
 746         return err;
 747 }