cgit.c

   1 /* cgit.c: cgi for the git scm
   2  *
   3  * Copyright (C) 2006-2014 cgit Development Team <cgit@lists.zx2c4.com>
   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 "ui-blob.h"
  17 #include "ui-summary.h"
  18 #include "scan-tree.h"
  19
  20 const char *cgit_version = CGIT_VERSION;
  21
  22 static void add_mimetype(const char *name, const char *value)
  23 {
  24         struct string_list_item *item;
  25
  26         item = string_list_insert(&ctx.cfg.mimetypes, xstrdup(name));
  27         item->util = xstrdup(value);
  28 }
  29
  30 static struct cgit_filter *new_filter(const char *cmd, filter_type filtertype)
  31 {
  32         struct cgit_filter *f;
  33         int args_size = 0;
  34         int extra_args;
  35
  36         if (!cmd || !cmd[0])
  37                 return NULL;
  38
  39         switch (filtertype) {
  40                 case SOURCE:
  41                 case ABOUT:
  42                         extra_args = 1;
  43                         break;
  44
  45                 case COMMIT:
  46                 default:
  47                         extra_args = 0;
  48                         break;
  49         }
  50
  51         f = xmalloc(sizeof(struct cgit_filter));
  52         f->cmd = xstrdup(cmd);
  53         args_size = (2 + extra_args) * sizeof(char *);
  54         f->argv = xmalloc(args_size);
  55         memset(f->argv, 0, args_size);
  56         f->argv[0] = f->cmd;
  57         return f;
  58 }
  59
  60 static void process_cached_repolist(const char *path);
  61
  62 static void repo_config(struct cgit_repo *repo, const char *name, const char *value)
  63 {
  64         struct string_list_item *item;
  65
  66         if (!strcmp(name, "name"))
  67                 repo->name = xstrdup(value);
  68         else if (!strcmp(name, "clone-url"))
  69                 repo->clone_url = xstrdup(value);
  70         else if (!strcmp(name, "desc"))
  71                 repo->desc = xstrdup(value);
  72         else if (!strcmp(name, "owner"))
  73                 repo->owner = xstrdup(value);
  74         else if (!strcmp(name, "defbranch"))
  75                 repo->defbranch = xstrdup(value);
  76         else if (!strcmp(name, "snapshots"))
  77                 repo->snapshots = ctx.cfg.snapshots & cgit_parse_snapshots_mask(value);
  78         else if (!strcmp(name, "enable-commit-graph"))
  79                 repo->enable_commit_graph = atoi(value);
  80         else if (!strcmp(name, "enable-log-filecount"))
  81                 repo->enable_log_filecount = atoi(value);
  82         else if (!strcmp(name, "enable-log-linecount"))
  83                 repo->enable_log_linecount = atoi(value);
  84         else if (!strcmp(name, "enable-remote-branches"))
  85                 repo->enable_remote_branches = atoi(value);
  86         else if (!strcmp(name, "enable-subject-links"))
  87                 repo->enable_subject_links = atoi(value);
  88         else if (!strcmp(name, "branch-sort")) {
  89                 if (!strcmp(value, "age"))
  90                         repo->branch_sort = 1;
  91                 if (!strcmp(value, "name"))
  92                         repo->branch_sort = 0;
  93         } else if (!strcmp(name, "commit-sort")) {
  94                 if (!strcmp(value, "date"))
  95                         repo->commit_sort = 1;
  96                 if (!strcmp(value, "topo"))
  97                         repo->commit_sort = 2;
  98         } else if (!strcmp(name, "max-stats"))
  99                 repo->max_stats = cgit_find_stats_period(value, NULL);
 100         else if (!strcmp(name, "module-link"))
 101                 repo->module_link= xstrdup(value);
 102         else if (!prefixcmp(name, "module-link.")) {
 103                 item = string_list_append(&repo->submodules, xstrdup(name + 12));
 104                 item->util = xstrdup(value);
 105         } else if (!strcmp(name, "section"))
 106                 repo->section = xstrdup(value);
 107         else if (!strcmp(name, "readme") && value != NULL) {
 108                 if (repo->readme.items == ctx.cfg.readme.items)
 109                         memset(&repo->readme, 0, sizeof(repo->readme));
 110                 string_list_append(&repo->readme, xstrdup(value));
 111         } else if (!strcmp(name, "logo") && value != NULL)
 112                 repo->logo = xstrdup(value);
 113         else if (!strcmp(name, "logo-link") && value != NULL)
 114                 repo->logo_link = xstrdup(value);
 115         else if (ctx.cfg.enable_filter_overrides) {
 116                 if (!strcmp(name, "about-filter"))
 117                         repo->about_filter = new_filter(value, ABOUT);
 118                 else if (!strcmp(name, "commit-filter"))
 119                         repo->commit_filter = new_filter(value, COMMIT);
 120                 else if (!strcmp(name, "source-filter"))
 121                         repo->source_filter = new_filter(value, SOURCE);
 122         }
 123 }
 124
 125 static void config_cb(const char *name, const char *value)
 126 {
 127         if (!strcmp(name, "section") || !strcmp(name, "repo.group"))
 128                 ctx.cfg.section = xstrdup(value);
 129         else if (!strcmp(name, "repo.url"))
 130                 ctx.repo = cgit_add_repo(value);
 131         else if (ctx.repo && !strcmp(name, "repo.path"))
 132                 ctx.repo->path = trim_end(value, '/');
 133         else if (ctx.repo && !prefixcmp(name, "repo."))
 134                 repo_config(ctx.repo, name + 5, value);
 135         else if (!strcmp(name, "readme") && value != NULL)
 136                 string_list_append(&ctx.cfg.readme, xstrdup(value));
 137         else if (!strcmp(name, "root-title"))
 138                 ctx.cfg.root_title = xstrdup(value);
 139         else if (!strcmp(name, "root-desc"))
 140                 ctx.cfg.root_desc = xstrdup(value);
 141         else if (!strcmp(name, "root-readme"))
 142                 ctx.cfg.root_readme = xstrdup(value);
 143         else if (!strcmp(name, "css"))
 144                 ctx.cfg.css = xstrdup(value);
 145         else if (!strcmp(name, "favicon"))
 146                 ctx.cfg.favicon = xstrdup(value);
 147         else if (!strcmp(name, "footer"))
 148                 ctx.cfg.footer = xstrdup(value);
 149         else if (!strcmp(name, "head-include"))
 150                 ctx.cfg.head_include = xstrdup(value);
 151         else if (!strcmp(name, "header"))
 152                 ctx.cfg.header = xstrdup(value);
 153         else if (!strcmp(name, "logo"))
 154                 ctx.cfg.logo = xstrdup(value);
 155         else if (!strcmp(name, "index-header"))
 156                 ctx.cfg.index_header = xstrdup(value);
 157         else if (!strcmp(name, "index-info"))
 158                 ctx.cfg.index_info = xstrdup(value);
 159         else if (!strcmp(name, "logo-link"))
 160                 ctx.cfg.logo_link = xstrdup(value);
 161         else if (!strcmp(name, "module-link"))
 162                 ctx.cfg.module_link = xstrdup(value);
 163         else if (!strcmp(name, "strict-export"))
 164                 ctx.cfg.strict_export = xstrdup(value);
 165         else if (!strcmp(name, "virtual-root")) {
 166                 ctx.cfg.virtual_root = ensure_end(value, '/');
 167         } else if (!strcmp(name, "nocache"))
 168                 ctx.cfg.nocache = atoi(value);
 169         else if (!strcmp(name, "noplainemail"))
 170                 ctx.cfg.noplainemail = atoi(value);
 171         else if (!strcmp(name, "noheader"))
 172                 ctx.cfg.noheader = atoi(value);
 173         else if (!strcmp(name, "snapshots"))
 174                 ctx.cfg.snapshots = cgit_parse_snapshots_mask(value);
 175         else if (!strcmp(name, "enable-filter-overrides"))
 176                 ctx.cfg.enable_filter_overrides = atoi(value);
 177         else if (!strcmp(name, "enable-http-clone"))
 178                 ctx.cfg.enable_http_clone = atoi(value);
 179         else if (!strcmp(name, "enable-index-links"))
 180                 ctx.cfg.enable_index_links = atoi(value);
 181         else if (!strcmp(name, "enable-index-owner"))
 182                 ctx.cfg.enable_index_owner = atoi(value);
 183         else if (!strcmp(name, "enable-commit-graph"))
 184                 ctx.cfg.enable_commit_graph = atoi(value);
 185         else if (!strcmp(name, "enable-log-filecount"))
 186                 ctx.cfg.enable_log_filecount = atoi(value);
 187         else if (!strcmp(name, "enable-log-linecount"))
 188                 ctx.cfg.enable_log_linecount = atoi(value);
 189         else if (!strcmp(name, "enable-remote-branches"))
 190                 ctx.cfg.enable_remote_branches = atoi(value);
 191         else if (!strcmp(name, "enable-subject-links"))
 192                 ctx.cfg.enable_subject_links = atoi(value);
 193         else if (!strcmp(name, "enable-tree-linenumbers"))
 194                 ctx.cfg.enable_tree_linenumbers = atoi(value);
 195         else if (!strcmp(name, "enable-git-config"))
 196                 ctx.cfg.enable_git_config = atoi(value);
 197         else if (!strcmp(name, "max-stats"))
 198                 ctx.cfg.max_stats = cgit_find_stats_period(value, NULL);
 199         else if (!strcmp(name, "cache-size"))
 200                 ctx.cfg.cache_size = atoi(value);
 201         else if (!strcmp(name, "cache-root"))
 202                 ctx.cfg.cache_root = xstrdup(expand_macros(value));
 203         else if (!strcmp(name, "cache-root-ttl"))
 204                 ctx.cfg.cache_root_ttl = atoi(value);
 205         else if (!strcmp(name, "cache-repo-ttl"))
 206                 ctx.cfg.cache_repo_ttl = atoi(value);
 207         else if (!strcmp(name, "cache-scanrc-ttl"))
 208                 ctx.cfg.cache_scanrc_ttl = atoi(value);
 209         else if (!strcmp(name, "cache-static-ttl"))
 210                 ctx.cfg.cache_static_ttl = atoi(value);
 211         else if (!strcmp(name, "cache-dynamic-ttl"))
 212                 ctx.cfg.cache_dynamic_ttl = atoi(value);
 213         else if (!strcmp(name, "cache-about-ttl"))
 214                 ctx.cfg.cache_about_ttl = atoi(value);
 215         else if (!strcmp(name, "case-sensitive-sort"))
 216                 ctx.cfg.case_sensitive_sort = atoi(value);
 217         else if (!strcmp(name, "about-filter"))
 218                 ctx.cfg.about_filter = new_filter(value, ABOUT);
 219         else if (!strcmp(name, "commit-filter"))
 220                 ctx.cfg.commit_filter = new_filter(value, COMMIT);
 221         else if (!strcmp(name, "embedded"))
 222                 ctx.cfg.embedded = atoi(value);
 223         else if (!strcmp(name, "max-atom-items"))
 224                 ctx.cfg.max_atom_items = atoi(value);
 225         else if (!strcmp(name, "max-message-length"))
 226                 ctx.cfg.max_msg_len = atoi(value);
 227         else if (!strcmp(name, "max-repodesc-length"))
 228                 ctx.cfg.max_repodesc_len = atoi(value);
 229         else if (!strcmp(name, "max-blob-size"))
 230                 ctx.cfg.max_blob_size = atoi(value);
 231         else if (!strcmp(name, "max-repo-count"))
 232                 ctx.cfg.max_repo_count = atoi(value);
 233         else if (!strcmp(name, "max-commit-count"))
 234                 ctx.cfg.max_commit_count = atoi(value);
 235         else if (!strcmp(name, "project-list"))
 236                 ctx.cfg.project_list = xstrdup(expand_macros(value));
 237         else if (!strcmp(name, "scan-path"))
 238                 if (!ctx.cfg.nocache && ctx.cfg.cache_size)
 239                         process_cached_repolist(expand_macros(value));
 240                 else if (ctx.cfg.project_list)
 241                         scan_projects(expand_macros(value),
 242                                       ctx.cfg.project_list, repo_config);
 243                 else
 244                         scan_tree(expand_macros(value), repo_config);
 245         else if (!strcmp(name, "scan-hidden-path"))
 246                 ctx.cfg.scan_hidden_path = atoi(value);
 247         else if (!strcmp(name, "section-from-path"))
 248                 ctx.cfg.section_from_path = atoi(value);
 249         else if (!strcmp(name, "repository-sort"))
 250                 ctx.cfg.repository_sort = xstrdup(value);
 251         else if (!strcmp(name, "section-sort"))
 252                 ctx.cfg.section_sort = atoi(value);
 253         else if (!strcmp(name, "source-filter"))
 254                 ctx.cfg.source_filter = new_filter(value, SOURCE);
 255         else if (!strcmp(name, "summary-log"))
 256                 ctx.cfg.summary_log = atoi(value);
 257         else if (!strcmp(name, "summary-branches"))
 258                 ctx.cfg.summary_branches = atoi(value);
 259         else if (!strcmp(name, "summary-tags"))
 260                 ctx.cfg.summary_tags = atoi(value);
 261         else if (!strcmp(name, "side-by-side-diffs"))
 262                 ctx.cfg.ssdiff = atoi(value);
 263         else if (!strcmp(name, "agefile"))
 264                 ctx.cfg.agefile = xstrdup(value);
 265         else if (!strcmp(name, "mimetype-file"))
 266                 ctx.cfg.mimetype_file = xstrdup(value);
 267         else if (!strcmp(name, "renamelimit"))
 268                 ctx.cfg.renamelimit = atoi(value);
 269         else if (!strcmp(name, "remove-suffix"))
 270                 ctx.cfg.remove_suffix = atoi(value);
 271         else if (!strcmp(name, "robots"))
 272                 ctx.cfg.robots = xstrdup(value);
 273         else if (!strcmp(name, "clone-prefix"))
 274                 ctx.cfg.clone_prefix = xstrdup(value);
 275         else if (!strcmp(name, "clone-url"))
 276                 ctx.cfg.clone_url = xstrdup(value);
 277         else if (!strcmp(name, "local-time"))
 278                 ctx.cfg.local_time = atoi(value);
 279         else if (!strcmp(name, "commit-sort")) {
 280                 if (!strcmp(value, "date"))
 281                         ctx.cfg.commit_sort = 1;
 282                 if (!strcmp(value, "topo"))
 283                         ctx.cfg.commit_sort = 2;
 284         } else if (!strcmp(name, "branch-sort")) {
 285                 if (!strcmp(value, "age"))
 286                         ctx.cfg.branch_sort = 1;
 287                 if (!strcmp(value, "name"))
 288                         ctx.cfg.branch_sort = 0;
 289         } else if (!prefixcmp(name, "mimetype."))
 290                 add_mimetype(name + 9, value);
 291         else if (!strcmp(name, "include"))
 292                 parse_configfile(expand_macros(value), config_cb);
 293 }
 294
 295 static void querystring_cb(const char *name, const char *value)
 296 {
 297         if (!value)
 298                 value = "";
 299
 300         if (!strcmp(name,"r")) {
 301                 ctx.qry.repo = xstrdup(value);
 302                 ctx.repo = cgit_get_repoinfo(value);
 303         } else if (!strcmp(name, "p")) {
 304                 ctx.qry.page = xstrdup(value);
 305         } else if (!strcmp(name, "url")) {
 306                 if (*value == '/')
 307                         value++;
 308                 ctx.qry.url = xstrdup(value);
 309                 cgit_parse_url(value);
 310         } else if (!strcmp(name, "qt")) {
 311                 ctx.qry.grep = xstrdup(value);
 312         } else if (!strcmp(name, "q")) {
 313                 ctx.qry.search = xstrdup(value);
 314         } else if (!strcmp(name, "h")) {
 315                 ctx.qry.head = xstrdup(value);
 316                 ctx.qry.has_symref = 1;
 317         } else if (!strcmp(name, "id")) {
 318                 ctx.qry.sha1 = xstrdup(value);
 319                 ctx.qry.has_sha1 = 1;
 320         } else if (!strcmp(name, "id2")) {
 321                 ctx.qry.sha2 = xstrdup(value);
 322                 ctx.qry.has_sha1 = 1;
 323         } else if (!strcmp(name, "ofs")) {
 324                 ctx.qry.ofs = atoi(value);
 325         } else if (!strcmp(name, "path")) {
 326                 ctx.qry.path = trim_end(value, '/');
 327         } else if (!strcmp(name, "name")) {
 328                 ctx.qry.name = xstrdup(value);
 329         } else if (!strcmp(name, "mimetype")) {
 330                 ctx.qry.mimetype = xstrdup(value);
 331         } else if (!strcmp(name, "s")) {
 332                 ctx.qry.sort = xstrdup(value);
 333         } else if (!strcmp(name, "showmsg")) {
 334                 ctx.qry.showmsg = atoi(value);
 335         } else if (!strcmp(name, "period")) {
 336                 ctx.qry.period = xstrdup(value);
 337         } else if (!strcmp(name, "ss")) {
 338                 ctx.qry.ssdiff = atoi(value);
 339                 ctx.qry.has_ssdiff = 1;
 340         } else if (!strcmp(name, "all")) {
 341                 ctx.qry.show_all = atoi(value);
 342         } else if (!strcmp(name, "context")) {
 343                 ctx.qry.context = atoi(value);
 344         } else if (!strcmp(name, "ignorews")) {
 345                 ctx.qry.ignorews = atoi(value);
 346         }
 347 }
 348
 349 static void prepare_context(struct cgit_context *ctx)
 350 {
 351         memset(ctx, 0, sizeof(*ctx));
 352         ctx->cfg.agefile = "info/web/last-modified";
 353         ctx->cfg.nocache = 0;
 354         ctx->cfg.cache_size = 0;
 355         ctx->cfg.cache_max_create_time = 5;
 356         ctx->cfg.cache_root = CGIT_CACHE_ROOT;
 357         ctx->cfg.cache_about_ttl = 15;
 358         ctx->cfg.cache_repo_ttl = 5;
 359         ctx->cfg.cache_root_ttl = 5;
 360         ctx->cfg.cache_scanrc_ttl = 15;
 361         ctx->cfg.cache_dynamic_ttl = 5;
 362         ctx->cfg.cache_static_ttl = -1;
 363         ctx->cfg.case_sensitive_sort = 1;
 364         ctx->cfg.branch_sort = 0;
 365         ctx->cfg.commit_sort = 0;
 366         ctx->cfg.css = "/cgit.css";
 367         ctx->cfg.logo = "/cgit.png";
 368         ctx->cfg.favicon = "/favicon.ico";
 369         ctx->cfg.local_time = 0;
 370         ctx->cfg.enable_http_clone = 1;
 371         ctx->cfg.enable_index_owner = 1;
 372         ctx->cfg.enable_tree_linenumbers = 1;
 373         ctx->cfg.enable_git_config = 0;
 374         ctx->cfg.max_repo_count = 50;
 375         ctx->cfg.max_commit_count = 50;
 376         ctx->cfg.max_lock_attempts = 5;
 377         ctx->cfg.max_msg_len = 80;
 378         ctx->cfg.max_repodesc_len = 80;
 379         ctx->cfg.max_blob_size = 0;
 380         ctx->cfg.max_stats = 0;
 381         ctx->cfg.project_list = NULL;
 382         ctx->cfg.renamelimit = -1;
 383         ctx->cfg.remove_suffix = 0;
 384         ctx->cfg.robots = "index, nofollow";
 385         ctx->cfg.root_title = "Git repository browser";
 386         ctx->cfg.root_desc = "a fast webinterface for the git dscm";
 387         ctx->cfg.scan_hidden_path = 0;
 388         ctx->cfg.script_name = CGIT_SCRIPT_NAME;
 389         ctx->cfg.section = "";
 390         ctx->cfg.repository_sort = "name";
 391         ctx->cfg.section_sort = 1;
 392         ctx->cfg.summary_branches = 10;
 393         ctx->cfg.summary_log = 10;
 394         ctx->cfg.summary_tags = 10;
 395         ctx->cfg.max_atom_items = 10;
 396         ctx->cfg.ssdiff = 0;
 397         ctx->env.cgit_config = getenv("CGIT_CONFIG");
 398         ctx->env.http_host = getenv("HTTP_HOST");
 399         ctx->env.https = getenv("HTTPS");
 400         ctx->env.no_http = getenv("NO_HTTP");
 401         ctx->env.path_info = getenv("PATH_INFO");
 402         ctx->env.query_string = getenv("QUERY_STRING");
 403         ctx->env.request_method = getenv("REQUEST_METHOD");
 404         ctx->env.script_name = getenv("SCRIPT_NAME");
 405         ctx->env.server_name = getenv("SERVER_NAME");
 406         ctx->env.server_port = getenv("SERVER_PORT");
 407         ctx->page.mimetype = "text/html";
 408         ctx->page.charset = PAGE_ENCODING;
 409         ctx->page.filename = NULL;
 410         ctx->page.size = 0;
 411         ctx->page.modified = time(NULL);
 412         ctx->page.expires = ctx->page.modified;
 413         ctx->page.etag = NULL;
 414         memset(&ctx->cfg.mimetypes, 0, sizeof(struct string_list));
 415         if (ctx->env.script_name)
 416                 ctx->cfg.script_name = xstrdup(ctx->env.script_name);
 417         if (ctx->env.query_string)
 418                 ctx->qry.raw = xstrdup(ctx->env.query_string);
 419         if (!ctx->env.cgit_config)
 420                 ctx->env.cgit_config = CGIT_CONFIG;
 421 }
 422
 423 struct refmatch {
 424         char *req_ref;
 425         char *first_ref;
 426         int match;
 427 };
 428
 429 static int find_current_ref(const char *refname, const unsigned char *sha1,
 430                             int flags, void *cb_data)
 431 {
 432         struct refmatch *info;
 433
 434         info = (struct refmatch *)cb_data;
 435         if (!strcmp(refname, info->req_ref))
 436                 info->match = 1;
 437         if (!info->first_ref)
 438                 info->first_ref = xstrdup(refname);
 439         return info->match;
 440 }
 441
 442 static void free_refmatch_inner(struct refmatch *info)
 443 {
 444         if (info->first_ref)
 445                 free(info->first_ref);
 446 }
 447
 448 static char *find_default_branch(struct cgit_repo *repo)
 449 {
 450         struct refmatch info;
 451         char *ref;
 452
 453         info.req_ref = repo->defbranch;
 454         info.first_ref = NULL;
 455         info.match = 0;
 456         for_each_branch_ref(find_current_ref, &info);
 457         if (info.match)
 458                 ref = info.req_ref;
 459         else
 460                 ref = info.first_ref;
 461         if (ref)
 462                 ref = xstrdup(ref);
 463         free_refmatch_inner(&info);
 464
 465         return ref;
 466 }
 467
 468 static char *guess_defbranch(void)
 469 {
 470         const char *ref;
 471         unsigned char sha1[20];
 472
 473         ref = resolve_ref_unsafe("HEAD", sha1, 0, NULL);
 474         if (!ref || prefixcmp(ref, "refs/heads/"))
 475                 return "master";
 476         return xstrdup(ref + 11);
 477 }
 478 /* The caller must free filename and ref after calling this. */
 479 static inline void parse_readme(const char *readme, char **filename, char **ref, struct cgit_repo *repo)
 480 {
 481         const char *colon;
 482
 483         *filename = NULL;
 484         *ref = NULL;
 485
 486         if (!readme || !readme[0])
 487                 return;
 488
 489         /* Check if the readme is tracked in the git repo. */
 490         colon = strchr(readme, ':');
 491         if (colon && strlen(colon) > 1) {
 492                 /* If it starts with a colon, we want to use
 493                  * the default branch */
 494                 if (colon == readme && repo->defbranch)
 495                         *ref = xstrdup(repo->defbranch);
 496                 else
 497                         *ref = xstrndup(readme, colon - readme);
 498                 readme = colon + 1;
 499         }
 500
 501         /* Prepend repo path to relative readme path unless tracked. */
 502         if (!(*ref) && readme[0] != '/')
 503                 *filename = fmtalloc("%s/%s", repo->path, readme);
 504         else
 505                 *filename = xstrdup(readme);
 506 }
 507 static void choose_readme(struct cgit_repo *repo)
 508 {
 509         int found;
 510         char *filename, *ref;
 511         struct string_list_item *entry;
 512
 513         if (!repo->readme.nr)
 514                 return;
 515
 516         found = 0;
 517         for_each_string_list_item(entry, &repo->readme) {
 518                 parse_readme(entry->string, &filename, &ref, repo);
 519                 if (!filename) {
 520                         free(filename);
 521                         free(ref);
 522                         continue;
 523                 }
 524                 /* If there's only one item, we skip the possibly expensive
 525                  * selection process. */
 526                 if (repo->readme.nr == 1) {
 527                         found = 1;
 528                         break;
 529                 }
 530                 if (ref) {
 531                         if (cgit_ref_path_exists(filename, ref, 1)) {
 532                                 found = 1;
 533                                 break;
 534                         }
 535                 }
 536                 else if (!access(filename, R_OK)) {
 537                         found = 1;
 538                         break;
 539                 }
 540                 free(filename);
 541                 free(ref);
 542         }
 543         repo->readme.strdup_strings = 1;
 544         string_list_clear(&repo->readme, 0);
 545         repo->readme.strdup_strings = 0;
 546         if (found)
 547                 string_list_append(&repo->readme, filename)->util = ref;
 548 }
 549
 550 static int prepare_repo_cmd(struct cgit_context *ctx)
 551 {
 552         unsigned char sha1[20];
 553         int nongit = 0;
 554         int rc;
 555
 556         /* The path to the git repository. */
 557         setenv("GIT_DIR", ctx->repo->path, 1);
 558
 559         /* Do not look in /etc/ for gitconfig and gitattributes. */
 560         setenv("GIT_CONFIG_NOSYSTEM", "1", 1);
 561         setenv("GIT_ATTR_NOSYSTEM", "1", 1);
 562         unsetenv("HOME");
 563         unsetenv("XDG_CONFIG_HOME");
 564
 565         /* Setup the git directory and initialize the notes system. Both of these
 566          * load local configuration from the git repository, so we do them both while
 567          * the HOME variables are unset. */
 568         setup_git_directory_gently(&nongit);
 569         init_display_notes(NULL);
 570
 571         if (nongit) {
 572                 const char *name = ctx->repo->name;
 573                 rc = errno;
 574                 ctx->page.title = fmtalloc("%s - %s", ctx->cfg.root_title,
 575                                                 "config error");
 576                 ctx->repo = NULL;
 577                 cgit_print_http_headers(ctx);
 578                 cgit_print_docstart(ctx);
 579                 cgit_print_pageheader(ctx);
 580                 cgit_print_error("Failed to open %s: %s", name,
 581                                  rc ? strerror(rc) : "Not a valid git repository");
 582                 cgit_print_docend();
 583                 return 1;
 584         }
 585         ctx->page.title = fmtalloc("%s - %s", ctx->repo->name, ctx->repo->desc);
 586
 587         if (!ctx->repo->defbranch)
 588                 ctx->repo->defbranch = guess_defbranch();
 589
 590         if (!ctx->qry.head) {
 591                 ctx->qry.nohead = 1;
 592                 ctx->qry.head = find_default_branch(ctx->repo);
 593         }
 594
 595         if (!ctx->qry.head) {
 596                 cgit_print_http_headers(ctx);
 597                 cgit_print_docstart(ctx);
 598                 cgit_print_pageheader(ctx);
 599                 cgit_print_error("Repository seems to be empty");
 600                 cgit_print_docend();
 601                 return 1;
 602         }
 603
 604         if (get_sha1(ctx->qry.head, sha1)) {
 605                 char *tmp = xstrdup(ctx->qry.head);
 606                 ctx->qry.head = ctx->repo->defbranch;
 607                 ctx->page.status = 404;
 608                 ctx->page.statusmsg = "Not found";
 609                 cgit_print_http_headers(ctx);
 610                 cgit_print_docstart(ctx);
 611                 cgit_print_pageheader(ctx);
 612                 cgit_print_error("Invalid branch: %s", tmp);
 613                 cgit_print_docend();
 614                 return 1;
 615         }
 616         sort_string_list(&ctx->repo->submodules);
 617         cgit_prepare_repo_env(ctx->repo);
 618         choose_readme(ctx->repo);
 619         return 0;
 620 }
 621
 622 static void process_request(void *cbdata)
 623 {
 624         struct cgit_context *ctx = cbdata;
 625         struct cgit_cmd *cmd;
 626
 627         cmd = cgit_get_cmd(ctx);
 628         if (!cmd) {
 629                 ctx->page.title = "cgit error";
 630                 ctx->page.status = 404;
 631                 ctx->page.statusmsg = "Not found";
 632                 cgit_print_http_headers(ctx);
 633                 cgit_print_docstart(ctx);
 634                 cgit_print_pageheader(ctx);
 635                 cgit_print_error("Invalid request");
 636                 cgit_print_docend();
 637                 return;
 638         }
 639
 640         if (!ctx->cfg.enable_http_clone && cmd->is_clone) {
 641                 html_status(404, "Not found", 0);
 642                 return;
 643         }
 644
 645         /* If cmd->want_vpath is set, assume ctx->qry.path contains a "virtual"
 646          * in-project path limit to be made available at ctx->qry.vpath.
 647          * Otherwise, no path limit is in effect (ctx->qry.vpath = NULL).
 648          */
 649         ctx->qry.vpath = cmd->want_vpath ? ctx->qry.path : NULL;
 650
 651         if (cmd->want_repo && !ctx->repo) {
 652                 cgit_print_http_headers(ctx);
 653                 cgit_print_docstart(ctx);
 654                 cgit_print_pageheader(ctx);
 655                 cgit_print_error("No repository selected");
 656                 cgit_print_docend();
 657                 return;
 658         }
 659
 660         if (ctx->repo && prepare_repo_cmd(ctx))
 661                 return;
 662
 663         if (cmd->want_layout) {
 664                 cgit_print_http_headers(ctx);
 665                 cgit_print_docstart(ctx);
 666                 cgit_print_pageheader(ctx);
 667         }
 668
 669         cmd->fn(ctx);
 670
 671         if (cmd->want_layout)
 672                 cgit_print_docend();
 673 }
 674
 675 static int cmp_repos(const void *a, const void *b)
 676 {
 677         const struct cgit_repo *ra = a, *rb = b;
 678         return strcmp(ra->url, rb->url);
 679 }
 680
 681 static char *build_snapshot_setting(int bitmap)
 682 {
 683         const struct cgit_snapshot_format *f;
 684         struct strbuf result = STRBUF_INIT;
 685
 686         for (f = cgit_snapshot_formats; f->suffix; f++) {
 687                 if (f->bit & bitmap) {
 688                         if (result.len)
 689                                 strbuf_addch(&result, ' ');
 690                         strbuf_addstr(&result, f->suffix);
 691                 }
 692         }
 693         return strbuf_detach(&result, NULL);
 694 }
 695
 696 static char *get_first_line(char *txt)
 697 {
 698         char *t = xstrdup(txt);
 699         char *p = strchr(t, '\n');
 700         if (p)
 701                 *p = '\0';
 702         return t;
 703 }
 704
 705 static void print_repo(FILE *f, struct cgit_repo *repo)
 706 {
 707         struct string_list_item *item;
 708         fprintf(f, "repo.url=%s\n", repo->url);
 709         fprintf(f, "repo.name=%s\n", repo->name);
 710         fprintf(f, "repo.path=%s\n", repo->path);
 711         if (repo->owner)
 712                 fprintf(f, "repo.owner=%s\n", repo->owner);
 713         if (repo->desc) {
 714                 char *tmp = get_first_line(repo->desc);
 715                 fprintf(f, "repo.desc=%s\n", tmp);
 716                 free(tmp);
 717         }
 718         for_each_string_list_item(item, &repo->readme) {
 719                 if (item->util)
 720                         fprintf(f, "repo.readme=%s:%s\n", (char *)item->util, item->string);
 721                 else
 722                         fprintf(f, "repo.readme=%s\n", item->string);
 723         }
 724         if (repo->defbranch)
 725                 fprintf(f, "repo.defbranch=%s\n", repo->defbranch);
 726         if (repo->module_link)
 727                 fprintf(f, "repo.module-link=%s\n", repo->module_link);
 728         if (repo->section)
 729                 fprintf(f, "repo.section=%s\n", repo->section);
 730         if (repo->clone_url)
 731                 fprintf(f, "repo.clone-url=%s\n", repo->clone_url);
 732         fprintf(f, "repo.enable-commit-graph=%d\n",
 733                 repo->enable_commit_graph);
 734         fprintf(f, "repo.enable-log-filecount=%d\n",
 735                 repo->enable_log_filecount);
 736         fprintf(f, "repo.enable-log-linecount=%d\n",
 737                 repo->enable_log_linecount);
 738         if (repo->about_filter && repo->about_filter != ctx.cfg.about_filter)
 739                 fprintf(f, "repo.about-filter=%s\n", repo->about_filter->cmd);
 740         if (repo->commit_filter && repo->commit_filter != ctx.cfg.commit_filter)
 741                 fprintf(f, "repo.commit-filter=%s\n", repo->commit_filter->cmd);
 742         if (repo->source_filter && repo->source_filter != ctx.cfg.source_filter)
 743                 fprintf(f, "repo.source-filter=%s\n", repo->source_filter->cmd);
 744         if (repo->snapshots != ctx.cfg.snapshots) {
 745                 char *tmp = build_snapshot_setting(repo->snapshots);
 746                 fprintf(f, "repo.snapshots=%s\n", tmp ? tmp : "");
 747                 free(tmp);
 748         }
 749         if (repo->max_stats != ctx.cfg.max_stats)
 750                 fprintf(f, "repo.max-stats=%s\n",
 751                         cgit_find_stats_periodname(repo->max_stats));
 752         if (repo->logo)
 753                 fprintf(f, "repo.logo=%s\n", repo->logo);
 754         if (repo->logo_link)
 755                 fprintf(f, "repo.logo-link=%s\n", repo->logo_link);
 756         fprintf(f, "repo.enable-remote-branches=%d\n", repo->enable_remote_branches);
 757         fprintf(f, "repo.enable-subject-links=%d\n", repo->enable_subject_links);
 758         if (repo->branch_sort == 1)
 759                 fprintf(f, "repo.branch-sort=age\n");
 760         if (repo->commit_sort) {
 761                 if (repo->commit_sort == 1)
 762                         fprintf(f, "repo.commit-sort=date\n");
 763                 else if (repo->commit_sort == 2)
 764                         fprintf(f, "repo.commit-sort=topo\n");
 765         }
 766         fprintf(f, "\n");
 767 }
 768
 769 static void print_repolist(FILE *f, struct cgit_repolist *list, int start)
 770 {
 771         int i;
 772
 773         for (i = start; i < list->count; i++)
 774                 print_repo(f, &list->repos[i]);
 775 }
 776
 777 /* Scan 'path' for git repositories, save the resulting repolist in 'cached_rc'
 778  * and return 0 on success.
 779  */
 780 static int generate_cached_repolist(const char *path, const char *cached_rc)
 781 {
 782         struct strbuf locked_rc = STRBUF_INIT;
 783         int result = 0;
 784         int idx;
 785         FILE *f;
 786
 787         strbuf_addf(&locked_rc, "%s.lock", cached_rc);
 788         f = fopen(locked_rc.buf, "wx");
 789         if (!f) {
 790                 /* Inform about the error unless the lockfile already existed,
 791                  * since that only means we've got concurrent requests.
 792                  */
 793                 result = errno;
 794                 if (result != EEXIST)
 795                         fprintf(stderr, "[cgit] Error opening %s: %s (%d)\n",
 796                                 locked_rc.buf, strerror(result), result);
 797                 goto out;
 798         }
 799         idx = cgit_repolist.count;
 800         if (ctx.cfg.project_list)
 801                 scan_projects(path, ctx.cfg.project_list, repo_config);
 802         else
 803                 scan_tree(path, repo_config);
 804         print_repolist(f, &cgit_repolist, idx);
 805         if (rename(locked_rc.buf, cached_rc))
 806                 fprintf(stderr, "[cgit] Error renaming %s to %s: %s (%d)\n",
 807                         locked_rc.buf, cached_rc, strerror(errno), errno);
 808         fclose(f);
 809 out:
 810         strbuf_release(&locked_rc);
 811         return result;
 812 }
 813
 814 static void process_cached_repolist(const char *path)
 815 {
 816         struct stat st;
 817         struct strbuf cached_rc = STRBUF_INIT;
 818         time_t age;
 819         unsigned long hash;
 820
 821         hash = hash_str(path);
 822         if (ctx.cfg.project_list)
 823                 hash += hash_str(ctx.cfg.project_list);
 824         strbuf_addf(&cached_rc, "%s/rc-%8lx", ctx.cfg.cache_root, hash);
 825
 826         if (stat(cached_rc.buf, &st)) {
 827                 /* Nothing is cached, we need to scan without forking. And
 828                  * if we fail to generate a cached repolist, we need to
 829                  * invoke scan_tree manually.
 830                  */
 831                 if (generate_cached_repolist(path, cached_rc.buf)) {
 832                         if (ctx.cfg.project_list)
 833                                 scan_projects(path, ctx.cfg.project_list,
 834                                               repo_config);
 835                         else
 836                                 scan_tree(path, repo_config);
 837                 }
 838                 goto out;
 839         }
 840
 841         parse_configfile(cached_rc.buf, config_cb);
 842
 843         /* If the cached configfile hasn't expired, lets exit now */
 844         age = time(NULL) - st.st_mtime;
 845         if (age <= (ctx.cfg.cache_scanrc_ttl * 60))
 846                 goto out;
 847
 848         /* The cached repolist has been parsed, but it was old. So lets
 849          * rescan the specified path and generate a new cached repolist
 850          * in a child-process to avoid latency for the current request.
 851          */
 852         if (fork())
 853                 goto out;
 854
 855         exit(generate_cached_repolist(path, cached_rc.buf));
 856 out:
 857         strbuf_release(&cached_rc);
 858 }
 859
 860 static void cgit_parse_args(int argc, const char **argv)
 861 {
 862         int i;
 863         int scan = 0;
 864
 865         for (i = 1; i < argc; i++) {
 866                 if (!prefixcmp(argv[i], "--cache=")) {
 867                         ctx.cfg.cache_root = xstrdup(argv[i] + 8);
 868                 } else if (!strcmp(argv[i], "--nocache")) {
 869                         ctx.cfg.nocache = 1;
 870                 } else if (!strcmp(argv[i], "--nohttp")) {
 871                         ctx.env.no_http = "1";
 872                 } else if (!prefixcmp(argv[i], "--query=")) {
 873                         ctx.qry.raw = xstrdup(argv[i] + 8);
 874                 } else if (!prefixcmp(argv[i], "--repo=")) {
 875                         ctx.qry.repo = xstrdup(argv[i] + 7);
 876                 } else if (!prefixcmp(argv[i], "--page=")) {
 877                         ctx.qry.page = xstrdup(argv[i] + 7);
 878                 } else if (!prefixcmp(argv[i], "--head=")) {
 879                         ctx.qry.head = xstrdup(argv[i] + 7);
 880                         ctx.qry.has_symref = 1;
 881                 } else if (!prefixcmp(argv[i], "--sha1=")) {
 882                         ctx.qry.sha1 = xstrdup(argv[i] + 7);
 883                         ctx.qry.has_sha1 = 1;
 884                 } else if (!prefixcmp(argv[i], "--ofs=")) {
 885                         ctx.qry.ofs = atoi(argv[i] + 6);
 886                 } else if (!prefixcmp(argv[i], "--scan-tree=") ||
 887                            !prefixcmp(argv[i], "--scan-path=")) {
 888                         /* HACK: the global snapshot bitmask defines the
 889                          * set of allowed snapshot formats, but the config
 890                          * file hasn't been parsed yet so the mask is
 891                          * currently 0. By setting all bits high before
 892                          * scanning we make sure that any in-repo cgitrc
 893                          * snapshot setting is respected by scan_tree().
 894                          * BTW: we assume that there'll never be more than
 895                          * 255 different snapshot formats supported by cgit...
 896                          */
 897                         ctx.cfg.snapshots = 0xFF;
 898                         scan++;
 899                         scan_tree(argv[i] + 12, repo_config);
 900                 }
 901         }
 902         if (scan) {
 903                 qsort(cgit_repolist.repos, cgit_repolist.count,
 904                         sizeof(struct cgit_repo), cmp_repos);
 905                 print_repolist(stdout, &cgit_repolist, 0);
 906                 exit(0);
 907         }
 908 }
 909
 910 static int calc_ttl()
 911 {
 912         if (!ctx.repo)
 913                 return ctx.cfg.cache_root_ttl;
 914
 915         if (!ctx.qry.page)
 916                 return ctx.cfg.cache_repo_ttl;
 917
 918         if (!strcmp(ctx.qry.page, "about"))
 919                 return ctx.cfg.cache_about_ttl;
 920
 921         if (ctx.qry.has_sha1)
 922                 return ctx.cfg.cache_static_ttl;
 923
 924         if (ctx.qry.has_symref)
 925                 return ctx.cfg.cache_dynamic_ttl;
 926
 927         return ctx.cfg.cache_repo_ttl;
 928 }
 929
 930 int main(int argc, const char **argv)
 931 {
 932         const char *path;
 933         int err, ttl;
 934
 935         prepare_context(&ctx);
 936         cgit_repolist.length = 0;
 937         cgit_repolist.count = 0;
 938         cgit_repolist.repos = NULL;
 939
 940         cgit_parse_args(argc, argv);
 941         parse_configfile(expand_macros(ctx.env.cgit_config), config_cb);
 942         ctx.repo = NULL;
 943         http_parse_querystring(ctx.qry.raw, querystring_cb);
 944
 945         /* If virtual-root isn't specified in cgitrc, lets pretend
 946          * that virtual-root equals SCRIPT_NAME, minus any possibly
 947          * trailing slashes.
 948          */
 949         if (!ctx.cfg.virtual_root && ctx.cfg.script_name)
 950                 ctx.cfg.virtual_root = ensure_end(ctx.cfg.script_name, '/');
 951
 952         /* If no url parameter is specified on the querystring, lets
 953          * use PATH_INFO as url. This allows cgit to work with virtual
 954          * urls without the need for rewriterules in the webserver (as
 955          * long as PATH_INFO is included in the cache lookup key).
 956          */
 957         path = ctx.env.path_info;
 958         if (!ctx.qry.url && path) {
 959                 if (path[0] == '/')
 960                         path++;
 961                 ctx.qry.url = xstrdup(path);
 962                 if (ctx.qry.raw) {
 963                         char *newqry = fmtalloc("%s?%s", path, ctx.qry.raw);
 964                         free(ctx.qry.raw);
 965                         ctx.qry.raw = newqry;
 966                 } else
 967                         ctx.qry.raw = xstrdup(ctx.qry.url);
 968                 cgit_parse_url(ctx.qry.url);
 969         }
 970
 971         ttl = calc_ttl();
 972         if (ttl < 0)
 973                 ctx.page.expires += 10 * 365 * 24 * 60 * 60; /* 10 years */
 974         else
 975                 ctx.page.expires += ttl * 60;
 976         if (ctx.env.request_method && !strcmp(ctx.env.request_method, "HEAD"))
 977                 ctx.cfg.nocache = 1;
 978         if (ctx.cfg.nocache)
 979                 ctx.cfg.cache_size = 0;
 980         err = cache_process(ctx.cfg.cache_size, ctx.cfg.cache_root,
 981                             ctx.qry.raw, ttl, process_request, &ctx);
 982         if (err)
 983                 cgit_print_error("Error processing page: %s (%d)",
 984                                  strerror(err), err);
 985         return err;
 986 }