cgit.c

   1 /* cgit.c: cgi for the git scm
   2  *
   3  * Copyright (C) 2006 Lars Hjemli
   4  * Copyright (C) 2010-2013 Jason A. Donenfeld <Jason@zx2c4.com>
   5  *
   6  * Licensed under GNU General Public License v2
   7  *   (see COPYING for full license text)
   8  */
   9
  10 #include "cgit.h"
  11 #include "cache.h"
  12 #include "cmd.h"
  13 #include "configfile.h"
  14 #include "html.h"
  15 #include "ui-shared.h"
  16 #include "ui-stats.h"
  17 #include "ui-blob.h"
  18 #include "ui-summary.h"
  19 #include "scan-tree.h"
  20
  21 const char *cgit_version = CGIT_VERSION;
  22
  23 static void add_mimetype(const char *name, const char *value)
  24 {
  25         struct string_list_item *item;
  26
  27         item = string_list_insert(&ctx.cfg.mimetypes, xstrdup(name));
  28         item->util = xstrdup(value);
  29 }
  30
  31 static struct cgit_filter *new_filter(const char *cmd, filter_type filtertype)
  32 {
  33         struct cgit_filter *f;
  34         int args_size = 0;
  35         int extra_args;
  36
  37         if (!cmd || !cmd[0])
  38                 return NULL;
  39
  40         switch (filtertype) {
  41                 case SOURCE:
  42                 case ABOUT:
  43                         extra_args = 1;
  44                         break;
  45
  46                 case COMMIT:
  47                 default:
  48                         extra_args = 0;
  49                         break;
  50         }
  51
  52         f = xmalloc(sizeof(struct cgit_filter));
  53         f->cmd = xstrdup(cmd);
  54         args_size = (2 + extra_args) * sizeof(char *);
  55         f->argv = xmalloc(args_size);
  56         memset(f->argv, 0, args_size);
  57         f->argv[0] = f->cmd;
  58         return f;
  59 }
  60
  61 static void process_cached_repolist(const char *path);
  62
  63 static void repo_config(struct cgit_repo *repo, const char *name, const char *value)
  64 {
  65         struct string_list_item *item;
  66
  67         if (!strcmp(name, "name"))
  68                 repo->name = xstrdup(value);
  69         else if (!strcmp(name, "clone-url"))
  70                 repo->clone_url = xstrdup(value);
  71         else if (!strcmp(name, "desc"))
  72                 repo->desc = xstrdup(value);
  73         else if (!strcmp(name, "owner"))
  74                 repo->owner = xstrdup(value);
  75         else if (!strcmp(name, "defbranch"))
  76                 repo->defbranch = xstrdup(value);
  77         else if (!strcmp(name, "snapshots"))
  78                 repo->snapshots = ctx.cfg.snapshots & cgit_parse_snapshots_mask(value);
  79         else if (!strcmp(name, "enable-commit-graph"))
  80                 repo->enable_commit_graph = atoi(value);
  81         else if (!strcmp(name, "enable-log-filecount"))
  82                 repo->enable_log_filecount = atoi(value);
  83         else if (!strcmp(name, "enable-log-linecount"))
  84                 repo->enable_log_linecount = atoi(value);
  85         else if (!strcmp(name, "enable-remote-branches"))
  86                 repo->enable_remote_branches = atoi(value);
  87         else if (!strcmp(name, "enable-subject-links"))
  88                 repo->enable_subject_links = atoi(value);
  89         else if (!strcmp(name, "branch-sort")) {
  90                 if (!strcmp(value, "age"))
  91                         repo->branch_sort = 1;
  92                 if (!strcmp(value, "name"))
  93                         repo->branch_sort = 0;
  94         } else if (!strcmp(name, "commit-sort")) {
  95                 if (!strcmp(value, "date"))
  96                         repo->commit_sort = 1;
  97                 if (!strcmp(value, "topo"))
  98                         repo->commit_sort = 2;
  99         } else if (!strcmp(name, "max-stats"))
 100                 repo->max_stats = cgit_find_stats_period(value, NULL);
 101         else if (!strcmp(name, "module-link"))
 102                 repo->module_link= xstrdup(value);
 103         else if (!prefixcmp(name, "module-link.")) {
 104                 item = string_list_append(&repo->submodules, xstrdup(name + 12));
 105                 item->util = xstrdup(value);
 106         } else if (!strcmp(name, "section"))
 107                 repo->section = xstrdup(value);
 108         else if (!strcmp(name, "readme") && value != NULL) {
 109                 if (repo->readme.items == ctx.cfg.readme.items)
 110                         memset(&repo->readme, 0, sizeof(repo->readme));
 111                 string_list_append(&repo->readme, xstrdup(value));
 112         } else if (!strcmp(name, "logo") && value != NULL)
 113                 repo->logo = xstrdup(value);
 114         else if (!strcmp(name, "logo-link") && value != NULL)
 115                 repo->logo_link = xstrdup(value);
 116         else if (ctx.cfg.enable_filter_overrides) {
 117                 if (!strcmp(name, "about-filter"))
 118                         repo->about_filter = new_filter(value, ABOUT);
 119                 else if (!strcmp(name, "commit-filter"))
 120                         repo->commit_filter = new_filter(value, COMMIT);
 121                 else if (!strcmp(name, "source-filter"))
 122                         repo->source_filter = new_filter(value, SOURCE);
 123         }
 124 }
 125
 126 static void config_cb(const char *name, const char *value)
 127 {
 128         if (!strcmp(name, "section") || !strcmp(name, "repo.group"))
 129                 ctx.cfg.section = xstrdup(value);
 130         else if (!strcmp(name, "repo.url"))
 131                 ctx.repo = cgit_add_repo(value);
 132         else if (ctx.repo && !strcmp(name, "repo.path"))
 133                 ctx.repo->path = trim_end(value, '/');
 134         else if (ctx.repo && !prefixcmp(name, "repo."))
 135                 repo_config(ctx.repo, name + 5, value);
 136         else if (!strcmp(name, "readme") && value != NULL)
 137                 string_list_append(&ctx.cfg.readme, xstrdup(value));
 138         else if (!strcmp(name, "root-title"))
 139                 ctx.cfg.root_title = xstrdup(value);
 140         else if (!strcmp(name, "root-desc"))
 141                 ctx.cfg.root_desc = xstrdup(value);
 142         else if (!strcmp(name, "root-readme"))
 143                 ctx.cfg.root_readme = xstrdup(value);
 144         else if (!strcmp(name, "css"))
 145                 ctx.cfg.css = xstrdup(value);
 146         else if (!strcmp(name, "favicon"))
 147                 ctx.cfg.favicon = xstrdup(value);
 148         else if (!strcmp(name, "footer"))
 149                 ctx.cfg.footer = xstrdup(value);
 150         else if (!strcmp(name, "head-include"))
 151                 ctx.cfg.head_include = xstrdup(value);
 152         else if (!strcmp(name, "header"))
 153                 ctx.cfg.header = xstrdup(value);
 154         else if (!strcmp(name, "logo"))
 155                 ctx.cfg.logo = xstrdup(value);
 156         else if (!strcmp(name, "index-header"))
 157                 ctx.cfg.index_header = xstrdup(value);
 158         else if (!strcmp(name, "index-info"))
 159                 ctx.cfg.index_info = xstrdup(value);
 160         else if (!strcmp(name, "logo-link"))
 161                 ctx.cfg.logo_link = xstrdup(value);
 162         else if (!strcmp(name, "module-link"))
 163                 ctx.cfg.module_link = xstrdup(value);
 164         else if (!strcmp(name, "strict-export"))
 165                 ctx.cfg.strict_export = xstrdup(value);
 166         else if (!strcmp(name, "virtual-root")) {
 167                 ctx.cfg.virtual_root = ensure_end(value, '/');
 168         } else if (!strcmp(name, "nocache"))
 169                 ctx.cfg.nocache = atoi(value);
 170         else if (!strcmp(name, "noplainemail"))
 171                 ctx.cfg.noplainemail = atoi(value);
 172         else if (!strcmp(name, "noheader"))
 173                 ctx.cfg.noheader = atoi(value);
 174         else if (!strcmp(name, "snapshots"))
 175                 ctx.cfg.snapshots = cgit_parse_snapshots_mask(value);
 176         else if (!strcmp(name, "enable-filter-overrides"))
 177                 ctx.cfg.enable_filter_overrides = atoi(value);
 178         else if (!strcmp(name, "enable-http-clone"))
 179                 ctx.cfg.enable_http_clone = atoi(value);
 180         else if (!strcmp(name, "enable-index-links"))
 181                 ctx.cfg.enable_index_links = atoi(value);
 182         else if (!strcmp(name, "enable-index-owner"))
 183                 ctx.cfg.enable_index_owner = atoi(value);
 184         else if (!strcmp(name, "enable-commit-graph"))
 185                 ctx.cfg.enable_commit_graph = atoi(value);
 186         else if (!strcmp(name, "enable-log-filecount"))
 187                 ctx.cfg.enable_log_filecount = atoi(value);
 188         else if (!strcmp(name, "enable-log-linecount"))
 189                 ctx.cfg.enable_log_linecount = atoi(value);
 190         else if (!strcmp(name, "enable-remote-branches"))
 191                 ctx.cfg.enable_remote_branches = atoi(value);
 192         else if (!strcmp(name, "enable-subject-links"))
 193                 ctx.cfg.enable_subject_links = atoi(value);
 194         else if (!strcmp(name, "enable-tree-linenumbers"))
 195                 ctx.cfg.enable_tree_linenumbers = atoi(value);
 196         else if (!strcmp(name, "enable-git-config"))
 197                 ctx.cfg.enable_git_config = atoi(value);
 198         else if (!strcmp(name, "max-stats"))
 199                 ctx.cfg.max_stats = cgit_find_stats_period(value, NULL);
 200         else if (!strcmp(name, "cache-size"))
 201                 ctx.cfg.cache_size = atoi(value);
 202         else if (!strcmp(name, "cache-root"))
 203                 ctx.cfg.cache_root = xstrdup(expand_macros(value));
 204         else if (!strcmp(name, "cache-root-ttl"))
 205                 ctx.cfg.cache_root_ttl = atoi(value);
 206         else if (!strcmp(name, "cache-repo-ttl"))
 207                 ctx.cfg.cache_repo_ttl = atoi(value);
 208         else if (!strcmp(name, "cache-scanrc-ttl"))
 209                 ctx.cfg.cache_scanrc_ttl = atoi(value);
 210         else if (!strcmp(name, "cache-static-ttl"))
 211                 ctx.cfg.cache_static_ttl = atoi(value);
 212         else if (!strcmp(name, "cache-dynamic-ttl"))
 213                 ctx.cfg.cache_dynamic_ttl = atoi(value);
 214         else if (!strcmp(name, "cache-about-ttl"))
 215                 ctx.cfg.cache_about_ttl = atoi(value);
 216         else if (!strcmp(name, "case-sensitive-sort"))
 217                 ctx.cfg.case_sensitive_sort = atoi(value);
 218         else if (!strcmp(name, "about-filter"))
 219                 ctx.cfg.about_filter = new_filter(value, ABOUT);
 220         else if (!strcmp(name, "commit-filter"))
 221                 ctx.cfg.commit_filter = new_filter(value, COMMIT);
 222         else if (!strcmp(name, "embedded"))
 223                 ctx.cfg.embedded = atoi(value);
 224         else if (!strcmp(name, "max-atom-items"))
 225                 ctx.cfg.max_atom_items = atoi(value);
 226         else if (!strcmp(name, "max-message-length"))
 227                 ctx.cfg.max_msg_len = atoi(value);
 228         else if (!strcmp(name, "max-repodesc-length"))
 229                 ctx.cfg.max_repodesc_len = atoi(value);
 230         else if (!strcmp(name, "max-blob-size"))
 231                 ctx.cfg.max_blob_size = atoi(value);
 232         else if (!strcmp(name, "max-repo-count"))
 233                 ctx.cfg.max_repo_count = atoi(value);
 234         else if (!strcmp(name, "max-commit-count"))
 235                 ctx.cfg.max_commit_count = atoi(value);
 236         else if (!strcmp(name, "project-list"))
 237                 ctx.cfg.project_list = xstrdup(expand_macros(value));
 238         else if (!strcmp(name, "scan-path"))
 239                 if (!ctx.cfg.nocache && ctx.cfg.cache_size)
 240                         process_cached_repolist(expand_macros(value));
 241                 else if (ctx.cfg.project_list)
 242                         scan_projects(expand_macros(value),
 243                                       ctx.cfg.project_list, repo_config);
 244                 else
 245                         scan_tree(expand_macros(value), repo_config);
 246         else if (!strcmp(name, "scan-hidden-path"))
 247                 ctx.cfg.scan_hidden_path = atoi(value);
 248         else if (!strcmp(name, "section-from-path"))
 249                 ctx.cfg.section_from_path = atoi(value);
 250         else if (!strcmp(name, "repository-sort"))
 251                 ctx.cfg.repository_sort = xstrdup(value);
 252         else if (!strcmp(name, "section-sort"))
 253                 ctx.cfg.section_sort = atoi(value);
 254         else if (!strcmp(name, "source-filter"))
 255                 ctx.cfg.source_filter = new_filter(value, SOURCE);
 256         else if (!strcmp(name, "summary-log"))
 257                 ctx.cfg.summary_log = atoi(value);
 258         else if (!strcmp(name, "summary-branches"))
 259                 ctx.cfg.summary_branches = atoi(value);
 260         else if (!strcmp(name, "summary-tags"))
 261                 ctx.cfg.summary_tags = atoi(value);
 262         else if (!strcmp(name, "side-by-side-diffs"))
 263                 ctx.cfg.ssdiff = atoi(value);
 264         else if (!strcmp(name, "agefile"))
 265                 ctx.cfg.agefile = xstrdup(value);
 266         else if (!strcmp(name, "mimetype-file"))
 267                 ctx.cfg.mimetype_file = xstrdup(value);
 268         else if (!strcmp(name, "renamelimit"))
 269                 ctx.cfg.renamelimit = atoi(value);
 270         else if (!strcmp(name, "remove-suffix"))
 271                 ctx.cfg.remove_suffix = atoi(value);
 272         else if (!strcmp(name, "robots"))
 273                 ctx.cfg.robots = xstrdup(value);
 274         else if (!strcmp(name, "clone-prefix"))
 275                 ctx.cfg.clone_prefix = xstrdup(value);
 276         else if (!strcmp(name, "clone-url"))
 277                 ctx.cfg.clone_url = xstrdup(value);
 278         else if (!strcmp(name, "local-time"))
 279                 ctx.cfg.local_time = atoi(value);
 280         else if (!strcmp(name, "commit-sort")) {
 281                 if (!strcmp(value, "date"))
 282                         ctx.cfg.commit_sort = 1;
 283                 if (!strcmp(value, "topo"))
 284                         ctx.cfg.commit_sort = 2;
 285         } else if (!strcmp(name, "branch-sort")) {
 286                 if (!strcmp(value, "age"))
 287                         ctx.cfg.branch_sort = 1;
 288                 if (!strcmp(value, "name"))
 289                         ctx.cfg.branch_sort = 0;
 290         } else if (!prefixcmp(name, "mimetype."))
 291                 add_mimetype(name + 9, value);
 292         else if (!strcmp(name, "include"))
 293                 parse_configfile(expand_macros(value), config_cb);
 294 }
 295
 296 static void querystring_cb(const char *name, const char *value)
 297 {
 298         if (!value)
 299                 value = "";
 300
 301         if (!strcmp(name,"r")) {
 302                 ctx.qry.repo = xstrdup(value);
 303                 ctx.repo = cgit_get_repoinfo(value);
 304         } else if (!strcmp(name, "p")) {
 305                 ctx.qry.page = xstrdup(value);
 306         } else if (!strcmp(name, "url")) {
 307                 if (*value == '/')
 308                         value++;
 309                 ctx.qry.url = xstrdup(value);
 310                 cgit_parse_url(value);
 311         } else if (!strcmp(name, "qt")) {
 312                 ctx.qry.grep = xstrdup(value);
 313         } else if (!strcmp(name, "q")) {
 314                 ctx.qry.search = xstrdup(value);
 315         } else if (!strcmp(name, "h")) {
 316                 ctx.qry.head = xstrdup(value);
 317                 ctx.qry.has_symref = 1;
 318         } else if (!strcmp(name, "id")) {
 319                 ctx.qry.sha1 = xstrdup(value);
 320                 ctx.qry.has_sha1 = 1;
 321         } else if (!strcmp(name, "id2")) {
 322                 ctx.qry.sha2 = xstrdup(value);
 323                 ctx.qry.has_sha1 = 1;
 324         } else if (!strcmp(name, "ofs")) {
 325                 ctx.qry.ofs = atoi(value);
 326         } else if (!strcmp(name, "path")) {
 327                 ctx.qry.path = trim_end(value, '/');
 328         } else if (!strcmp(name, "name")) {
 329                 ctx.qry.name = xstrdup(value);
 330         } else if (!strcmp(name, "mimetype")) {
 331                 ctx.qry.mimetype = xstrdup(value);
 332         } else if (!strcmp(name, "s")) {
 333                 ctx.qry.sort = xstrdup(value);
 334         } else if (!strcmp(name, "showmsg")) {
 335                 ctx.qry.showmsg = atoi(value);
 336         } else if (!strcmp(name, "period")) {
 337                 ctx.qry.period = xstrdup(value);
 338         } else if (!strcmp(name, "ss")) {
 339                 ctx.qry.ssdiff = atoi(value);
 340                 ctx.qry.has_ssdiff = 1;
 341         } else if (!strcmp(name, "all")) {
 342                 ctx.qry.show_all = atoi(value);
 343         } else if (!strcmp(name, "context")) {
 344                 ctx.qry.context = atoi(value);
 345         } else if (!strcmp(name, "ignorews")) {
 346                 ctx.qry.ignorews = atoi(value);
 347         }
 348 }
 349
 350 static void prepare_context(struct cgit_context *ctx)
 351 {
 352         memset(ctx, 0, sizeof(*ctx));
 353         ctx->cfg.agefile = "info/web/last-modified";
 354         ctx->cfg.nocache = 0;
 355         ctx->cfg.cache_size = 0;
 356         ctx->cfg.cache_max_create_time = 5;
 357         ctx->cfg.cache_root = CGIT_CACHE_ROOT;
 358         ctx->cfg.cache_about_ttl = 15;
 359         ctx->cfg.cache_repo_ttl = 5;
 360         ctx->cfg.cache_root_ttl = 5;
 361         ctx->cfg.cache_scanrc_ttl = 15;
 362         ctx->cfg.cache_dynamic_ttl = 5;
 363         ctx->cfg.cache_static_ttl = -1;
 364         ctx->cfg.case_sensitive_sort = 1;
 365         ctx->cfg.branch_sort = 0;
 366         ctx->cfg.commit_sort = 0;
 367         ctx->cfg.css = "/cgit.css";
 368         ctx->cfg.logo = "/cgit.png";
 369         ctx->cfg.favicon = "/favicon.ico";
 370         ctx->cfg.local_time = 0;
 371         ctx->cfg.enable_http_clone = 1;
 372         ctx->cfg.enable_index_owner = 1;
 373         ctx->cfg.enable_tree_linenumbers = 1;
 374         ctx->cfg.enable_git_config = 0;
 375         ctx->cfg.max_repo_count = 50;
 376         ctx->cfg.max_commit_count = 50;
 377         ctx->cfg.max_lock_attempts = 5;
 378         ctx->cfg.max_msg_len = 80;
 379         ctx->cfg.max_repodesc_len = 80;
 380         ctx->cfg.max_blob_size = 0;
 381         ctx->cfg.max_stats = 0;
 382         ctx->cfg.project_list = NULL;
 383         ctx->cfg.renamelimit = -1;
 384         ctx->cfg.remove_suffix = 0;
 385         ctx->cfg.robots = "index, nofollow";
 386         ctx->cfg.root_title = "Git repository browser";
 387         ctx->cfg.root_desc = "a fast webinterface for the git dscm";
 388         ctx->cfg.scan_hidden_path = 0;
 389         ctx->cfg.script_name = CGIT_SCRIPT_NAME;
 390         ctx->cfg.section = "";
 391         ctx->cfg.repository_sort = "name";
 392         ctx->cfg.section_sort = 1;
 393         ctx->cfg.summary_branches = 10;
 394         ctx->cfg.summary_log = 10;
 395         ctx->cfg.summary_tags = 10;
 396         ctx->cfg.max_atom_items = 10;
 397         ctx->cfg.ssdiff = 0;
 398         ctx->env.cgit_config = getenv("CGIT_CONFIG");
 399         ctx->env.http_host = getenv("HTTP_HOST");
 400         ctx->env.https = getenv("HTTPS");
 401         ctx->env.no_http = getenv("NO_HTTP");
 402         ctx->env.path_info = getenv("PATH_INFO");
 403         ctx->env.query_string = getenv("QUERY_STRING");
 404         ctx->env.request_method = getenv("REQUEST_METHOD");
 405         ctx->env.script_name = getenv("SCRIPT_NAME");
 406         ctx->env.server_name = getenv("SERVER_NAME");
 407         ctx->env.server_port = getenv("SERVER_PORT");
 408         ctx->page.mimetype = "text/html";
 409         ctx->page.charset = PAGE_ENCODING;
 410         ctx->page.filename = NULL;
 411         ctx->page.size = 0;
 412         ctx->page.modified = time(NULL);
 413         ctx->page.expires = ctx->page.modified;
 414         ctx->page.etag = NULL;
 415         memset(&ctx->cfg.mimetypes, 0, sizeof(struct string_list));
 416         if (ctx->env.script_name)
 417                 ctx->cfg.script_name = xstrdup(ctx->env.script_name);
 418         if (ctx->env.query_string)
 419                 ctx->qry.raw = xstrdup(ctx->env.query_string);
 420         if (!ctx->env.cgit_config)
 421                 ctx->env.cgit_config = CGIT_CONFIG;
 422 }
 423
 424 struct refmatch {
 425         char *req_ref;
 426         char *first_ref;
 427         int match;
 428 };
 429
 430 static int find_current_ref(const char *refname, const unsigned char *sha1,
 431                             int flags, void *cb_data)
 432 {
 433         struct refmatch *info;
 434
 435         info = (struct refmatch *)cb_data;
 436         if (!strcmp(refname, info->req_ref))
 437                 info->match = 1;
 438         if (!info->first_ref)
 439                 info->first_ref = xstrdup(refname);
 440         return info->match;
 441 }
 442
 443 static void free_refmatch_inner(struct refmatch *info)
 444 {
 445         if (info->first_ref)
 446                 free(info->first_ref);
 447 }
 448
 449 static char *find_default_branch(struct cgit_repo *repo)
 450 {
 451         struct refmatch info;
 452         char *ref;
 453
 454         info.req_ref = repo->defbranch;
 455         info.first_ref = NULL;
 456         info.match = 0;
 457         for_each_branch_ref(find_current_ref, &info);
 458         if (info.match)
 459                 ref = info.req_ref;
 460         else
 461                 ref = info.first_ref;
 462         if (ref)
 463                 ref = xstrdup(ref);
 464         free_refmatch_inner(&info);
 465
 466         return ref;
 467 }
 468
 469 static char *guess_defbranch(void)
 470 {
 471         const char *ref;
 472         unsigned char sha1[20];
 473
 474         ref = resolve_ref_unsafe("HEAD", sha1, 0, NULL);
 475         if (!ref || prefixcmp(ref, "refs/heads/"))
 476                 return "master";
 477         return xstrdup(ref + 11);
 478 }
 479 /* The caller must free filename and ref after calling this. */
 480 static inline void parse_readme(const char *readme, char **filename, char **ref, struct cgit_repo *repo)
 481 {
 482         const char *colon;
 483
 484         *filename = NULL;
 485         *ref = NULL;
 486
 487         if (!readme || !readme[0])
 488                 return;
 489
 490         /* Check if the readme is tracked in the git repo. */
 491         colon = strchr(readme, ':');
 492         if (colon && strlen(colon) > 1) {
 493                 /* If it starts with a colon, we want to use
 494                  * the default branch */
 495                 if (colon == readme && repo->defbranch)
 496                         *ref = xstrdup(repo->defbranch);
 497                 else
 498                         *ref = xstrndup(readme, colon - readme);
 499                 readme = colon + 1;
 500         }
 501
 502         /* Prepend repo path to relative readme path unless tracked. */
 503         if (!(*ref) && readme[0] != '/')
 504                 *filename = fmtalloc("%s/%s", repo->path, readme);
 505         else
 506                 *filename = xstrdup(readme);
 507 }
 508 static void choose_readme(struct cgit_repo *repo)
 509 {
 510         int found;
 511         char *filename, *ref;
 512         struct string_list_item *entry;
 513
 514         if (!repo->readme.nr)
 515                 return;
 516
 517         found = 0;
 518         for_each_string_list_item(entry, &repo->readme) {
 519                 parse_readme(entry->string, &filename, &ref, repo);
 520                 if (!filename) {
 521                         free(filename);
 522                         free(ref);
 523                         continue;
 524                 }
 525                 /* If there's only one item, we skip the possibly expensive
 526                  * selection process. */
 527                 if (repo->readme.nr == 1) {
 528                         found = 1;
 529                         break;
 530                 }
 531                 if (ref) {
 532                         if (cgit_ref_path_exists(filename, ref, 1)) {
 533                                 found = 1;
 534                                 break;
 535                         }
 536                 }
 537                 else if (!access(filename, R_OK)) {
 538                         found = 1;
 539                         break;
 540                 }
 541                 free(filename);
 542                 free(ref);
 543         }
 544         repo->readme.strdup_strings = 1;
 545         string_list_clear(&repo->readme, 0);
 546         repo->readme.strdup_strings = 0;
 547         if (found)
 548                 string_list_append(&repo->readme, filename)->util = ref;
 549 }
 550
 551 static int prepare_repo_cmd(struct cgit_context *ctx)
 552 {
 553         unsigned char sha1[20];
 554         int nongit = 0;
 555         int rc;
 556
 557         /* The path to the git repository. */
 558         setenv("GIT_DIR", ctx->repo->path, 1);
 559
 560         /* Do not look in /etc/ for gitconfig and gitattributes. */
 561         setenv("GIT_CONFIG_NOSYSTEM", "1", 1);
 562         setenv("GIT_ATTR_NOSYSTEM", "1", 1);
 563         unsetenv("HOME");
 564         unsetenv("XDG_CONFIG_HOME");
 565
 566         /* Setup the git directory and initialize the notes system. Both of these
 567          * load local configuration from the git repository, so we do them both while
 568          * the HOME variables are unset. */
 569         setup_git_directory_gently(&nongit);
 570         init_display_notes(NULL);
 571
 572         if (nongit) {
 573                 const char *name = ctx->repo->name;
 574                 rc = errno;
 575                 ctx->page.title = fmtalloc("%s - %s", ctx->cfg.root_title,
 576                                                 "config error");
 577                 ctx->repo = NULL;
 578                 cgit_print_http_headers(ctx);
 579                 cgit_print_docstart(ctx);
 580                 cgit_print_pageheader(ctx);
 581                 cgit_print_error("Failed to open %s: %s", name,
 582                                  rc ? strerror(rc) : "Not a valid git repository");
 583                 cgit_print_docend();
 584                 return 1;
 585         }
 586         ctx->page.title = fmtalloc("%s - %s", ctx->repo->name, ctx->repo->desc);
 587
 588         if (!ctx->repo->defbranch)
 589                 ctx->repo->defbranch = guess_defbranch();
 590
 591         if (!ctx->qry.head) {
 592                 ctx->qry.nohead = 1;
 593                 ctx->qry.head = find_default_branch(ctx->repo);
 594         }
 595
 596         if (!ctx->qry.head) {
 597                 cgit_print_http_headers(ctx);
 598                 cgit_print_docstart(ctx);
 599                 cgit_print_pageheader(ctx);
 600                 cgit_print_error("Repository seems to be empty");
 601                 cgit_print_docend();
 602                 return 1;
 603         }
 604
 605         if (get_sha1(ctx->qry.head, sha1)) {
 606                 char *tmp = xstrdup(ctx->qry.head);
 607                 ctx->qry.head = ctx->repo->defbranch;
 608                 ctx->page.status = 404;
 609                 ctx->page.statusmsg = "Not found";
 610                 cgit_print_http_headers(ctx);
 611                 cgit_print_docstart(ctx);
 612                 cgit_print_pageheader(ctx);
 613                 cgit_print_error("Invalid branch: %s", tmp);
 614                 cgit_print_docend();
 615                 return 1;
 616         }
 617         sort_string_list(&ctx->repo->submodules);
 618         cgit_prepare_repo_env(ctx->repo);
 619         choose_readme(ctx->repo);
 620         return 0;
 621 }
 622
 623 static void process_request(void *cbdata)
 624 {
 625         struct cgit_context *ctx = cbdata;
 626         struct cgit_cmd *cmd;
 627
 628         cmd = cgit_get_cmd(ctx);
 629         if (!cmd) {
 630                 ctx->page.title = "cgit error";
 631                 ctx->page.status = 404;
 632                 ctx->page.statusmsg = "Not found";
 633                 cgit_print_http_headers(ctx);
 634                 cgit_print_docstart(ctx);
 635                 cgit_print_pageheader(ctx);
 636                 cgit_print_error("Invalid request");
 637                 cgit_print_docend();
 638                 return;
 639         }
 640
 641         if (!ctx->cfg.enable_http_clone && cmd->is_clone) {
 642                 html_status(404, "Not found", 0);
 643                 return;
 644         }
 645
 646         /* If cmd->want_vpath is set, assume ctx->qry.path contains a "virtual"
 647          * in-project path limit to be made available at ctx->qry.vpath.
 648          * Otherwise, no path limit is in effect (ctx->qry.vpath = NULL).
 649          */
 650         ctx->qry.vpath = cmd->want_vpath ? ctx->qry.path : NULL;
 651
 652         if (cmd->want_repo && !ctx->repo) {
 653                 cgit_print_http_headers(ctx);
 654                 cgit_print_docstart(ctx);
 655                 cgit_print_pageheader(ctx);
 656                 cgit_print_error("No repository selected");
 657                 cgit_print_docend();
 658                 return;
 659         }
 660
 661         if (ctx->repo && prepare_repo_cmd(ctx))
 662                 return;
 663
 664         if (cmd->want_layout) {
 665                 cgit_print_http_headers(ctx);
 666                 cgit_print_docstart(ctx);
 667                 cgit_print_pageheader(ctx);
 668         }
 669
 670         cmd->fn(ctx);
 671
 672         if (cmd->want_layout)
 673                 cgit_print_docend();
 674 }
 675
 676 static int cmp_repos(const void *a, const void *b)
 677 {
 678         const struct cgit_repo *ra = a, *rb = b;
 679         return strcmp(ra->url, rb->url);
 680 }
 681
 682 static char *build_snapshot_setting(int bitmap)
 683 {
 684         const struct cgit_snapshot_format *f;
 685         struct strbuf result = STRBUF_INIT;
 686
 687         for (f = cgit_snapshot_formats; f->suffix; f++) {
 688                 if (f->bit & bitmap) {
 689                         if (result.len)
 690                                 strbuf_addch(&result, ' ');
 691                         strbuf_addstr(&result, f->suffix);
 692                 }
 693         }
 694         return strbuf_detach(&result, NULL);
 695 }
 696
 697 static char *get_first_line(char *txt)
 698 {
 699         char *t = xstrdup(txt);
 700         char *p = strchr(t, '\n');
 701         if (p)
 702                 *p = '\0';
 703         return t;
 704 }
 705
 706 static void print_repo(FILE *f, struct cgit_repo *repo)
 707 {
 708         struct string_list_item *item;
 709         fprintf(f, "repo.url=%s\n", repo->url);
 710         fprintf(f, "repo.name=%s\n", repo->name);
 711         fprintf(f, "repo.path=%s\n", repo->path);
 712         if (repo->owner)
 713                 fprintf(f, "repo.owner=%s\n", repo->owner);
 714         if (repo->desc) {
 715                 char *tmp = get_first_line(repo->desc);
 716                 fprintf(f, "repo.desc=%s\n", tmp);
 717                 free(tmp);
 718         }
 719         for_each_string_list_item(item, &repo->readme) {
 720                 if (item->util)
 721                         fprintf(f, "repo.readme=%s:%s\n", (char *)item->util, item->string);
 722                 else
 723                         fprintf(f, "repo.readme=%s\n", item->string);
 724         }
 725         if (repo->defbranch)
 726                 fprintf(f, "repo.defbranch=%s\n", repo->defbranch);
 727         if (repo->module_link)
 728                 fprintf(f, "repo.module-link=%s\n", repo->module_link);
 729         if (repo->section)
 730                 fprintf(f, "repo.section=%s\n", repo->section);
 731         if (repo->clone_url)
 732                 fprintf(f, "repo.clone-url=%s\n", repo->clone_url);
 733         fprintf(f, "repo.enable-commit-graph=%d\n",
 734                 repo->enable_commit_graph);
 735         fprintf(f, "repo.enable-log-filecount=%d\n",
 736                 repo->enable_log_filecount);
 737         fprintf(f, "repo.enable-log-linecount=%d\n",
 738                 repo->enable_log_linecount);
 739         if (repo->about_filter && repo->about_filter != ctx.cfg.about_filter)
 740                 fprintf(f, "repo.about-filter=%s\n", repo->about_filter->cmd);
 741         if (repo->commit_filter && repo->commit_filter != ctx.cfg.commit_filter)
 742                 fprintf(f, "repo.commit-filter=%s\n", repo->commit_filter->cmd);
 743         if (repo->source_filter && repo->source_filter != ctx.cfg.source_filter)
 744                 fprintf(f, "repo.source-filter=%s\n", repo->source_filter->cmd);
 745         if (repo->snapshots != ctx.cfg.snapshots) {
 746                 char *tmp = build_snapshot_setting(repo->snapshots);
 747                 fprintf(f, "repo.snapshots=%s\n", tmp ? tmp : "");
 748                 free(tmp);
 749         }
 750         if (repo->max_stats != ctx.cfg.max_stats)
 751                 fprintf(f, "repo.max-stats=%s\n",
 752                         cgit_find_stats_periodname(repo->max_stats));
 753         if (repo->logo)
 754                 fprintf(f, "repo.logo=%s\n", repo->logo);
 755         if (repo->logo_link)
 756                 fprintf(f, "repo.logo-link=%s\n", repo->logo_link);
 757         fprintf(f, "repo.enable-remote-branches=%d\n", repo->enable_remote_branches);
 758         fprintf(f, "repo.enable-subject-links=%d\n", repo->enable_subject_links);
 759         if (repo->branch_sort == 1)
 760                 fprintf(f, "repo.branch-sort=age\n");
 761         if (repo->commit_sort) {
 762                 if (repo->commit_sort == 1)
 763                         fprintf(f, "repo.commit-sort=date\n");
 764                 else if (repo->commit_sort == 2)
 765                         fprintf(f, "repo.commit-sort=topo\n");
 766         }
 767         fprintf(f, "\n");
 768 }
 769
 770 static void print_repolist(FILE *f, struct cgit_repolist *list, int start)
 771 {
 772         int i;
 773
 774         for (i = start; i < list->count; i++)
 775                 print_repo(f, &list->repos[i]);
 776 }
 777
 778 /* Scan 'path' for git repositories, save the resulting repolist in 'cached_rc'
 779  * and return 0 on success.
 780  */
 781 static int generate_cached_repolist(const char *path, const char *cached_rc)
 782 {
 783         struct strbuf locked_rc = STRBUF_INIT;
 784         int result = 0;
 785         int idx;
 786         FILE *f;
 787
 788         strbuf_addf(&locked_rc, "%s.lock", cached_rc);
 789         f = fopen(locked_rc.buf, "wx");
 790         if (!f) {
 791                 /* Inform about the error unless the lockfile already existed,
 792                  * since that only means we've got concurrent requests.
 793                  */
 794                 result = errno;
 795                 if (result != EEXIST)
 796                         fprintf(stderr, "[cgit] Error opening %s: %s (%d)\n",
 797                                 locked_rc.buf, strerror(result), result);
 798                 goto out;
 799         }
 800         idx = cgit_repolist.count;
 801         if (ctx.cfg.project_list)
 802                 scan_projects(path, ctx.cfg.project_list, repo_config);
 803         else
 804                 scan_tree(path, repo_config);
 805         print_repolist(f, &cgit_repolist, idx);
 806         if (rename(locked_rc.buf, cached_rc))
 807                 fprintf(stderr, "[cgit] Error renaming %s to %s: %s (%d)\n",
 808                         locked_rc.buf, cached_rc, strerror(errno), errno);
 809         fclose(f);
 810 out:
 811         strbuf_release(&locked_rc);
 812         return result;
 813 }
 814
 815 static void process_cached_repolist(const char *path)
 816 {
 817         struct stat st;
 818         struct strbuf cached_rc = STRBUF_INIT;
 819         time_t age;
 820         unsigned long hash;
 821
 822         hash = hash_str(path);
 823         if (ctx.cfg.project_list)
 824                 hash += hash_str(ctx.cfg.project_list);
 825         strbuf_addf(&cached_rc, "%s/rc-%8lx", ctx.cfg.cache_root, hash);
 826
 827         if (stat(cached_rc.buf, &st)) {
 828                 /* Nothing is cached, we need to scan without forking. And
 829                  * if we fail to generate a cached repolist, we need to
 830                  * invoke scan_tree manually.
 831                  */
 832                 if (generate_cached_repolist(path, cached_rc.buf)) {
 833                         if (ctx.cfg.project_list)
 834                                 scan_projects(path, ctx.cfg.project_list,
 835                                               repo_config);
 836                         else
 837                                 scan_tree(path, repo_config);
 838                 }
 839                 goto out;
 840         }
 841
 842         parse_configfile(cached_rc.buf, config_cb);
 843
 844         /* If the cached configfile hasn't expired, lets exit now */
 845         age = time(NULL) - st.st_mtime;
 846         if (age <= (ctx.cfg.cache_scanrc_ttl * 60))
 847                 goto out;
 848
 849         /* The cached repolist has been parsed, but it was old. So lets
 850          * rescan the specified path and generate a new cached repolist
 851          * in a child-process to avoid latency for the current request.
 852          */
 853         if (fork())
 854                 goto out;
 855
 856         exit(generate_cached_repolist(path, cached_rc.buf));
 857 out:
 858         strbuf_release(&cached_rc);
 859 }
 860
 861 static void cgit_parse_args(int argc, const char **argv)
 862 {
 863         int i;
 864         int scan = 0;
 865
 866         for (i = 1; i < argc; i++) {
 867                 if (!strncmp(argv[i], "--cache=", 8)) {
 868                         ctx.cfg.cache_root = xstrdup(argv[i] + 8);
 869                 }
 870                 if (!strcmp(argv[i], "--nocache")) {
 871                         ctx.cfg.nocache = 1;
 872                 }
 873                 if (!strcmp(argv[i], "--nohttp")) {
 874                         ctx.env.no_http = "1";
 875                 }
 876                 if (!strncmp(argv[i], "--query=", 8)) {
 877                         ctx.qry.raw = xstrdup(argv[i] + 8);
 878                 }
 879                 if (!strncmp(argv[i], "--repo=", 7)) {
 880                         ctx.qry.repo = xstrdup(argv[i] + 7);
 881                 }
 882                 if (!strncmp(argv[i], "--page=", 7)) {
 883                         ctx.qry.page = xstrdup(argv[i] + 7);
 884                 }
 885                 if (!strncmp(argv[i], "--head=", 7)) {
 886                         ctx.qry.head = xstrdup(argv[i] + 7);
 887                         ctx.qry.has_symref = 1;
 888                 }
 889                 if (!strncmp(argv[i], "--sha1=", 7)) {
 890                         ctx.qry.sha1 = xstrdup(argv[i] + 7);
 891                         ctx.qry.has_sha1 = 1;
 892                 }
 893                 if (!strncmp(argv[i], "--ofs=", 6)) {
 894                         ctx.qry.ofs = atoi(argv[i] + 6);
 895                 }
 896                 if (!strncmp(argv[i], "--scan-tree=", 12) ||
 897                     !strncmp(argv[i], "--scan-path=", 12)) {
 898                         /* HACK: the global snapshot bitmask defines the
 899                          * set of allowed snapshot formats, but the config
 900                          * file hasn't been parsed yet so the mask is
 901                          * currently 0. By setting all bits high before
 902                          * scanning we make sure that any in-repo cgitrc
 903                          * snapshot setting is respected by scan_tree().
 904                          * BTW: we assume that there'll never be more than
 905                          * 255 different snapshot formats supported by cgit...
 906                          */
 907                         ctx.cfg.snapshots = 0xFF;
 908                         scan++;
 909                         scan_tree(argv[i] + 12, repo_config);
 910                 }
 911         }
 912         if (scan) {
 913                 qsort(cgit_repolist.repos, cgit_repolist.count,
 914                         sizeof(struct cgit_repo), cmp_repos);
 915                 print_repolist(stdout, &cgit_repolist, 0);
 916                 exit(0);
 917         }
 918 }
 919
 920 static int calc_ttl()
 921 {
 922         if (!ctx.repo)
 923                 return ctx.cfg.cache_root_ttl;
 924
 925         if (!ctx.qry.page)
 926                 return ctx.cfg.cache_repo_ttl;
 927
 928         if (!strcmp(ctx.qry.page, "about"))
 929                 return ctx.cfg.cache_about_ttl;
 930
 931         if (ctx.qry.has_sha1)
 932                 return ctx.cfg.cache_static_ttl;
 933
 934         if (ctx.qry.has_symref)
 935                 return ctx.cfg.cache_dynamic_ttl;
 936
 937         return ctx.cfg.cache_repo_ttl;
 938 }
 939
 940 int main(int argc, const char **argv)
 941 {
 942         const char *path;
 943         int err, ttl;
 944
 945         prepare_context(&ctx);
 946         cgit_repolist.length = 0;
 947         cgit_repolist.count = 0;
 948         cgit_repolist.repos = NULL;
 949
 950         cgit_parse_args(argc, argv);
 951         parse_configfile(expand_macros(ctx.env.cgit_config), config_cb);
 952         ctx.repo = NULL;
 953         http_parse_querystring(ctx.qry.raw, querystring_cb);
 954
 955         /* If virtual-root isn't specified in cgitrc, lets pretend
 956          * that virtual-root equals SCRIPT_NAME, minus any possibly
 957          * trailing slashes.
 958          */
 959         if (!ctx.cfg.virtual_root && ctx.cfg.script_name)
 960                 ctx.cfg.virtual_root = ensure_end(ctx.cfg.script_name, '/');
 961
 962         /* If no url parameter is specified on the querystring, lets
 963          * use PATH_INFO as url. This allows cgit to work with virtual
 964          * urls without the need for rewriterules in the webserver (as
 965          * long as PATH_INFO is included in the cache lookup key).
 966          */
 967         path = ctx.env.path_info;
 968         if (!ctx.qry.url && path) {
 969                 if (path[0] == '/')
 970                         path++;
 971                 ctx.qry.url = xstrdup(path);
 972                 if (ctx.qry.raw) {
 973                         char *newqry = fmtalloc("%s?%s", path, ctx.qry.raw);
 974                         free(ctx.qry.raw);
 975                         ctx.qry.raw = newqry;
 976                 } else
 977                         ctx.qry.raw = xstrdup(ctx.qry.url);
 978                 cgit_parse_url(ctx.qry.url);
 979         }
 980
 981         ttl = calc_ttl();
 982         if (ttl < 0)
 983                 ctx.page.expires += 10 * 365 * 24 * 60 * 60; /* 10 years */
 984         else
 985                 ctx.page.expires += ttl * 60;
 986         if (ctx.env.request_method && !strcmp(ctx.env.request_method, "HEAD"))
 987                 ctx.cfg.nocache = 1;
 988         if (ctx.cfg.nocache)
 989                 ctx.cfg.cache_size = 0;
 990         err = cache_process(ctx.cfg.cache_size, ctx.cfg.cache_root,
 991                             ctx.qry.raw, ttl, process_request, &ctx);
 992         if (err)
 993                 cgit_print_error("Error processing page: %s (%d)",
 994                                  strerror(err), err);
 995         return err;
 996 }