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