cgit.c

   1 /* cgit.c: cgi for the git scm
   2  *
   3  * Copyright (C) 2006 Lars Hjemli
   4  * Copyright (C) 2010, 2012 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 "scan-tree.h"
  18
  19 const char *cgit_version = CGIT_VERSION;
  20
  21 static void add_mimetype(const char *name, const char *value)
  22 {
  23         struct string_list_item *item;
  24
  25         item = string_list_insert(&ctx.cfg.mimetypes, xstrdup(name));
  26         item->util = xstrdup(value);
  27 }
  28
  29 static struct cgit_filter *new_filter(const char *cmd, filter_type filtertype)
  30 {
  31         struct cgit_filter *f;
  32         int args_size = 0;
  33         int extra_args;
  34
  35         if (!cmd || !cmd[0])
  36                 return NULL;
  37
  38         switch (filtertype) {
  39                 case SOURCE:
  40                         extra_args = 1;
  41                         break;
  42
  43                 case ABOUT:
  44                 case COMMIT:
  45                 default:
  46                         extra_args = 0;
  47                         break;
  48         }
  49
  50         f = xmalloc(sizeof(struct cgit_filter));
  51         f->cmd = xstrdup(cmd);
  52         args_size = (2 + extra_args) * sizeof(char *);
  53         f->argv = xmalloc(args_size);
  54         memset(f->argv, 0, args_size);
  55         f->argv[0] = f->cmd;
  56         return f;
  57 }
  58
  59 static void process_cached_repolist(const char *path);
  60
  61 static void repo_config(struct cgit_repo *repo, const char *name, const char *value)
  62 {
  63         struct string_list_item *item;
  64
  65         if (!strcmp(name, "name"))
  66                 repo->name = xstrdup(value);
  67         else if (!strcmp(name, "clone-url"))
  68                 repo->clone_url = xstrdup(value);
  69         else if (!strcmp(name, "desc"))
  70                 repo->desc = xstrdup(value);
  71         else if (!strcmp(name, "owner"))
  72                 repo->owner = xstrdup(value);
  73         else if (!strcmp(name, "defbranch"))
  74                 repo->defbranch = xstrdup(value);
  75         else if (!strcmp(name, "snapshots"))
  76                 repo->snapshots = ctx.cfg.snapshots & cgit_parse_snapshots_mask(value);
  77         else if (!strcmp(name, "enable-commit-graph"))
  78                 repo->enable_commit_graph = atoi(value);
  79         else if (!strcmp(name, "enable-log-filecount"))
  80                 repo->enable_log_filecount = atoi(value);
  81         else if (!strcmp(name, "enable-log-linecount"))
  82                 repo->enable_log_linecount = atoi(value);
  83         else if (!strcmp(name, "enable-remote-branches"))
  84                 repo->enable_remote_branches = atoi(value);
  85         else if (!strcmp(name, "enable-subject-links"))
  86                 repo->enable_subject_links = atoi(value);
  87         else if (!strcmp(name, "commit-sort")) {
  88                 if (!strcmp(value, "date"))
  89                         repo->commit_sort = 1;
  90                 if (!strcmp(value, "topo"))
  91                         repo->commit_sort = 2;
  92         } else if (!strcmp(name, "max-stats"))
  93                 repo->max_stats = cgit_find_stats_period(value, NULL);
  94         else if (!strcmp(name, "module-link"))
  95                 repo->module_link= xstrdup(value);
  96         else if (!prefixcmp(name, "module-link.")) {
  97                 item = string_list_append(&repo->submodules, name + 12);
  98                 item->util = xstrdup(value);
  99         } else if (!strcmp(name, "section"))
 100                 repo->section = xstrdup(value);
 101         else if (!strcmp(name, "readme") && value != NULL)
 102                 repo->readme = xstrdup(value);
 103         else if (!strcmp(name, "logo") && value != NULL)
 104                 repo->logo = xstrdup(value);
 105         else if (!strcmp(name, "logo-link") && value != NULL)
 106                 repo->logo_link = xstrdup(value);
 107         else if (ctx.cfg.enable_filter_overrides) {
 108                 if (!strcmp(name, "about-filter"))
 109                         repo->about_filter = new_filter(value, ABOUT);
 110                 else if (!strcmp(name, "commit-filter"))
 111                         repo->commit_filter = new_filter(value, COMMIT);
 112                 else if (!strcmp(name, "source-filter"))
 113                         repo->source_filter = new_filter(value, SOURCE);
 114         }
 115 }
 116
 117 static void config_cb(const char *name, const char *value)
 118 {
 119         if (!strcmp(name, "section") || !strcmp(name, "repo.group"))
 120                 ctx.cfg.section = xstrdup(value);
 121         else if (!strcmp(name, "repo.url"))
 122                 ctx.repo = cgit_add_repo(value);
 123         else if (ctx.repo && !strcmp(name, "repo.path"))
 124                 ctx.repo->path = trim_end(value, '/');
 125         else if (ctx.repo && !prefixcmp(name, "repo."))
 126                 repo_config(ctx.repo, name + 5, value);
 127         else if (!strcmp(name, "readme"))
 128                 ctx.cfg.readme = xstrdup(value);
 129         else if (!strcmp(name, "root-title"))
 130                 ctx.cfg.root_title = xstrdup(value);
 131         else if (!strcmp(name, "root-desc"))
 132                 ctx.cfg.root_desc = xstrdup(value);
 133         else if (!strcmp(name, "root-readme"))
 134                 ctx.cfg.root_readme = xstrdup(value);
 135         else if (!strcmp(name, "css"))
 136                 ctx.cfg.css = xstrdup(value);
 137         else if (!strcmp(name, "favicon"))
 138                 ctx.cfg.favicon = xstrdup(value);
 139         else if (!strcmp(name, "footer"))
 140                 ctx.cfg.footer = xstrdup(value);
 141         else if (!strcmp(name, "head-include"))
 142                 ctx.cfg.head_include = xstrdup(value);
 143         else if (!strcmp(name, "header"))
 144                 ctx.cfg.header = xstrdup(value);
 145         else if (!strcmp(name, "logo"))
 146                 ctx.cfg.logo = xstrdup(value);
 147         else if (!strcmp(name, "index-header"))
 148                 ctx.cfg.index_header = xstrdup(value);
 149         else if (!strcmp(name, "index-info"))
 150                 ctx.cfg.index_info = xstrdup(value);
 151         else if (!strcmp(name, "logo-link"))
 152                 ctx.cfg.logo_link = xstrdup(value);
 153         else if (!strcmp(name, "module-link"))
 154                 ctx.cfg.module_link = xstrdup(value);
 155         else if (!strcmp(name, "strict-export"))
 156                 ctx.cfg.strict_export = xstrdup(value);
 157         else if (!strcmp(name, "virtual-root")) {
 158                 ctx.cfg.virtual_root = ensure_end(value, '/');
 159         } else if (!strcmp(name, "nocache"))
 160                 ctx.cfg.nocache = atoi(value);
 161         else if (!strcmp(name, "noplainemail"))
 162                 ctx.cfg.noplainemail = atoi(value);
 163         else if (!strcmp(name, "noheader"))
 164                 ctx.cfg.noheader = atoi(value);
 165         else if (!strcmp(name, "snapshots"))
 166                 ctx.cfg.snapshots = cgit_parse_snapshots_mask(value);
 167         else if (!strcmp(name, "enable-filter-overrides"))
 168                 ctx.cfg.enable_filter_overrides = atoi(value);
 169         else if (!strcmp(name, "enable-http-clone"))
 170                 ctx.cfg.enable_http_clone = atoi(value);
 171         else if (!strcmp(name, "enable-index-links"))
 172                 ctx.cfg.enable_index_links = atoi(value);
 173         else if (!strcmp(name, "enable-index-owner"))
 174                 ctx.cfg.enable_index_owner = atoi(value);
 175         else if (!strcmp(name, "enable-commit-graph"))
 176                 ctx.cfg.enable_commit_graph = atoi(value);
 177         else if (!strcmp(name, "enable-log-filecount"))
 178                 ctx.cfg.enable_log_filecount = atoi(value);
 179         else if (!strcmp(name, "enable-log-linecount"))
 180                 ctx.cfg.enable_log_linecount = atoi(value);
 181         else if (!strcmp(name, "enable-remote-branches"))
 182                 ctx.cfg.enable_remote_branches = atoi(value);
 183         else if (!strcmp(name, "enable-subject-links"))
 184                 ctx.cfg.enable_subject_links = atoi(value);
 185         else if (!strcmp(name, "enable-tree-linenumbers"))
 186                 ctx.cfg.enable_tree_linenumbers = atoi(value);
 187         else if (!strcmp(name, "enable-git-config"))
 188                 ctx.cfg.enable_git_config = atoi(value);
 189         else if (!strcmp(name, "max-stats"))
 190                 ctx.cfg.max_stats = cgit_find_stats_period(value, NULL);
 191         else if (!strcmp(name, "cache-size"))
 192                 ctx.cfg.cache_size = atoi(value);
 193         else if (!strcmp(name, "cache-root"))
 194                 ctx.cfg.cache_root = xstrdup(expand_macros(value));
 195         else if (!strcmp(name, "cache-root-ttl"))
 196                 ctx.cfg.cache_root_ttl = atoi(value);
 197         else if (!strcmp(name, "cache-repo-ttl"))
 198                 ctx.cfg.cache_repo_ttl = atoi(value);
 199         else if (!strcmp(name, "cache-scanrc-ttl"))
 200                 ctx.cfg.cache_scanrc_ttl = atoi(value);
 201         else if (!strcmp(name, "cache-static-ttl"))
 202                 ctx.cfg.cache_static_ttl = atoi(value);
 203         else if (!strcmp(name, "cache-dynamic-ttl"))
 204                 ctx.cfg.cache_dynamic_ttl = atoi(value);
 205         else if (!strcmp(name, "case-sensitive-sort"))
 206                 ctx.cfg.case_sensitive_sort = atoi(value);
 207         else if (!strcmp(name, "about-filter"))
 208                 ctx.cfg.about_filter = new_filter(value, ABOUT);
 209         else if (!strcmp(name, "commit-filter"))
 210                 ctx.cfg.commit_filter = new_filter(value, COMMIT);
 211         else if (!strcmp(name, "embedded"))
 212                 ctx.cfg.embedded = atoi(value);
 213         else if (!strcmp(name, "max-atom-items"))
 214                 ctx.cfg.max_atom_items = atoi(value);
 215         else if (!strcmp(name, "max-message-length"))
 216                 ctx.cfg.max_msg_len = atoi(value);
 217         else if (!strcmp(name, "max-repodesc-length"))
 218                 ctx.cfg.max_repodesc_len = atoi(value);
 219         else if (!strcmp(name, "max-blob-size"))
 220                 ctx.cfg.max_blob_size = atoi(value);
 221         else if (!strcmp(name, "max-repo-count"))
 222                 ctx.cfg.max_repo_count = atoi(value);
 223         else if (!strcmp(name, "max-commit-count"))
 224                 ctx.cfg.max_commit_count = atoi(value);
 225         else if (!strcmp(name, "project-list"))
 226                 ctx.cfg.project_list = xstrdup(expand_macros(value));
 227         else if (!strcmp(name, "scan-path"))
 228                 if (!ctx.cfg.nocache && ctx.cfg.cache_size)
 229                         process_cached_repolist(expand_macros(value));
 230                 else if (ctx.cfg.project_list)
 231                         scan_projects(expand_macros(value),
 232                                       ctx.cfg.project_list, repo_config);
 233                 else
 234                         scan_tree(expand_macros(value), repo_config);
 235         else if (!strcmp(name, "scan-hidden-path"))
 236                 ctx.cfg.scan_hidden_path = atoi(value);
 237         else if (!strcmp(name, "section-from-path"))
 238                 ctx.cfg.section_from_path = atoi(value);
 239         else if (!strcmp(name, "repository-sort"))
 240                 ctx.cfg.repository_sort = xstrdup(value);
 241         else if (!strcmp(name, "section-sort"))
 242                 ctx.cfg.section_sort = atoi(value);
 243         else if (!strcmp(name, "source-filter"))
 244                 ctx.cfg.source_filter = new_filter(value, SOURCE);
 245         else if (!strcmp(name, "summary-log"))
 246                 ctx.cfg.summary_log = atoi(value);
 247         else if (!strcmp(name, "summary-branches"))
 248                 ctx.cfg.summary_branches = atoi(value);
 249         else if (!strcmp(name, "summary-tags"))
 250                 ctx.cfg.summary_tags = atoi(value);
 251         else if (!strcmp(name, "side-by-side-diffs"))
 252                 ctx.cfg.ssdiff = atoi(value);
 253         else if (!strcmp(name, "agefile"))
 254                 ctx.cfg.agefile = xstrdup(value);
 255         else if (!strcmp(name, "mimetype-file"))
 256                 ctx.cfg.mimetype_file = xstrdup(value);
 257         else if (!strcmp(name, "renamelimit"))
 258                 ctx.cfg.renamelimit = atoi(value);
 259         else if (!strcmp(name, "remove-suffix"))
 260                 ctx.cfg.remove_suffix = atoi(value);
 261         else if (!strcmp(name, "robots"))
 262                 ctx.cfg.robots = xstrdup(value);
 263         else if (!strcmp(name, "clone-prefix"))
 264                 ctx.cfg.clone_prefix = xstrdup(value);
 265         else if (!strcmp(name, "clone-url"))
 266                 ctx.cfg.clone_url = xstrdup(value);
 267         else if (!strcmp(name, "local-time"))
 268                 ctx.cfg.local_time = atoi(value);
 269         else if (!strcmp(name, "commit-sort")) {
 270                 if (!strcmp(value, "date"))
 271                         ctx.cfg.commit_sort = 1;
 272                 if (!strcmp(value, "topo"))
 273                         ctx.cfg.commit_sort = 2;
 274         } else if (!prefixcmp(name, "mimetype."))
 275                 add_mimetype(name + 9, value);
 276         else if (!strcmp(name, "include"))
 277                 parse_configfile(expand_macros(value), config_cb);
 278 }
 279
 280 static void querystring_cb(const char *name, const char *value)
 281 {
 282         if (!value)
 283                 value = "";
 284
 285         if (!strcmp(name,"r")) {
 286                 ctx.qry.repo = xstrdup(value);
 287                 ctx.repo = cgit_get_repoinfo(value);
 288         } else if (!strcmp(name, "p")) {
 289                 ctx.qry.page = xstrdup(value);
 290         } else if (!strcmp(name, "url")) {
 291                 if (*value == '/')
 292                         value++;
 293                 ctx.qry.url = xstrdup(value);
 294                 cgit_parse_url(value);
 295         } else if (!strcmp(name, "qt")) {
 296                 ctx.qry.grep = xstrdup(value);
 297         } else if (!strcmp(name, "q")) {
 298                 ctx.qry.search = xstrdup(value);
 299         } else if (!strcmp(name, "h")) {
 300                 ctx.qry.head = xstrdup(value);
 301                 ctx.qry.has_symref = 1;
 302         } else if (!strcmp(name, "id")) {
 303                 ctx.qry.sha1 = xstrdup(value);
 304                 ctx.qry.has_sha1 = 1;
 305         } else if (!strcmp(name, "id2")) {
 306                 ctx.qry.sha2 = xstrdup(value);
 307                 ctx.qry.has_sha1 = 1;
 308         } else if (!strcmp(name, "ofs")) {
 309                 ctx.qry.ofs = atoi(value);
 310         } else if (!strcmp(name, "path")) {
 311                 ctx.qry.path = trim_end(value, '/');
 312         } else if (!strcmp(name, "name")) {
 313                 ctx.qry.name = xstrdup(value);
 314         } else if (!strcmp(name, "mimetype")) {
 315                 ctx.qry.mimetype = xstrdup(value);
 316         } else if (!strcmp(name, "s")) {
 317                 ctx.qry.sort = xstrdup(value);
 318         } else if (!strcmp(name, "showmsg")) {
 319                 ctx.qry.showmsg = atoi(value);
 320         } else if (!strcmp(name, "period")) {
 321                 ctx.qry.period = xstrdup(value);
 322         } else if (!strcmp(name, "ss")) {
 323                 ctx.qry.ssdiff = atoi(value);
 324                 ctx.qry.has_ssdiff = 1;
 325         } else if (!strcmp(name, "all")) {
 326                 ctx.qry.show_all = atoi(value);
 327         } else if (!strcmp(name, "context")) {
 328                 ctx.qry.context = atoi(value);
 329         } else if (!strcmp(name, "ignorews")) {
 330                 ctx.qry.ignorews = atoi(value);
 331         }
 332 }
 333
 334 static void prepare_context(struct cgit_context *ctx)
 335 {
 336         memset(ctx, 0, sizeof(*ctx));
 337         ctx->cfg.agefile = "info/web/last-modified";
 338         ctx->cfg.nocache = 0;
 339         ctx->cfg.cache_size = 0;
 340         ctx->cfg.cache_dynamic_ttl = 5;
 341         ctx->cfg.cache_max_create_time = 5;
 342         ctx->cfg.cache_repo_ttl = 5;
 343         ctx->cfg.cache_root = CGIT_CACHE_ROOT;
 344         ctx->cfg.cache_root_ttl = 5;
 345         ctx->cfg.cache_scanrc_ttl = 15;
 346         ctx->cfg.cache_static_ttl = -1;
 347         ctx->cfg.case_sensitive_sort = 1;
 348         ctx->cfg.css = "/cgit.css";
 349         ctx->cfg.logo = "/cgit.png";
 350         ctx->cfg.local_time = 0;
 351         ctx->cfg.enable_http_clone = 1;
 352         ctx->cfg.enable_index_owner = 1;
 353         ctx->cfg.enable_tree_linenumbers = 1;
 354         ctx->cfg.enable_git_config = 0;
 355         ctx->cfg.max_repo_count = 50;
 356         ctx->cfg.max_commit_count = 50;
 357         ctx->cfg.max_lock_attempts = 5;
 358         ctx->cfg.max_msg_len = 80;
 359         ctx->cfg.max_repodesc_len = 80;
 360         ctx->cfg.max_blob_size = 0;
 361         ctx->cfg.max_stats = 0;
 362         ctx->cfg.project_list = NULL;
 363         ctx->cfg.renamelimit = -1;
 364         ctx->cfg.remove_suffix = 0;
 365         ctx->cfg.robots = "index, nofollow";
 366         ctx->cfg.root_title = "Git repository browser";
 367         ctx->cfg.root_desc = "a fast webinterface for the git dscm";
 368         ctx->cfg.scan_hidden_path = 0;
 369         ctx->cfg.script_name = CGIT_SCRIPT_NAME;
 370         ctx->cfg.section = "";
 371         ctx->cfg.repository_sort = "name";
 372         ctx->cfg.section_sort = 1;
 373         ctx->cfg.summary_branches = 10;
 374         ctx->cfg.summary_log = 10;
 375         ctx->cfg.summary_tags = 10;
 376         ctx->cfg.max_atom_items = 10;
 377         ctx->cfg.ssdiff = 0;
 378         ctx->env.cgit_config = getenv("CGIT_CONFIG");
 379         ctx->env.http_host = getenv("HTTP_HOST");
 380         ctx->env.https = getenv("HTTPS");
 381         ctx->env.no_http = getenv("NO_HTTP");
 382         ctx->env.path_info = getenv("PATH_INFO");
 383         ctx->env.query_string = getenv("QUERY_STRING");
 384         ctx->env.request_method = getenv("REQUEST_METHOD");
 385         ctx->env.script_name = getenv("SCRIPT_NAME");
 386         ctx->env.server_name = getenv("SERVER_NAME");
 387         ctx->env.server_port = getenv("SERVER_PORT");
 388         ctx->page.mimetype = "text/html";
 389         ctx->page.charset = PAGE_ENCODING;
 390         ctx->page.filename = NULL;
 391         ctx->page.size = 0;
 392         ctx->page.modified = time(NULL);
 393         ctx->page.expires = ctx->page.modified;
 394         ctx->page.etag = NULL;
 395         memset(&ctx->cfg.mimetypes, 0, sizeof(struct string_list));
 396         if (ctx->env.script_name)
 397                 ctx->cfg.script_name = xstrdup(ctx->env.script_name);
 398         if (ctx->env.query_string)
 399                 ctx->qry.raw = xstrdup(ctx->env.query_string);
 400         if (!ctx->env.cgit_config)
 401                 ctx->env.cgit_config = CGIT_CONFIG;
 402 }
 403
 404 struct refmatch {
 405         char *req_ref;
 406         char *first_ref;
 407         int match;
 408 };
 409
 410 static int find_current_ref(const char *refname, const unsigned char *sha1,
 411                             int flags, void *cb_data)
 412 {
 413         struct refmatch *info;
 414
 415         info = (struct refmatch *)cb_data;
 416         if (!strcmp(refname, info->req_ref))
 417                 info->match = 1;
 418         if (!info->first_ref)
 419                 info->first_ref = xstrdup(refname);
 420         return info->match;
 421 }
 422
 423 static void free_refmatch_inner(struct refmatch *info)
 424 {
 425         if (info->first_ref)
 426                 free(info->first_ref);
 427 }
 428
 429 static char *find_default_branch(struct cgit_repo *repo)
 430 {
 431         struct refmatch info;
 432         char *ref;
 433
 434         info.req_ref = repo->defbranch;
 435         info.first_ref = NULL;
 436         info.match = 0;
 437         for_each_branch_ref(find_current_ref, &info);
 438         if (info.match)
 439                 ref = info.req_ref;
 440         else
 441                 ref = info.first_ref;
 442         if (ref)
 443                 ref = xstrdup(ref);
 444         free_refmatch_inner(&info);
 445
 446         return ref;
 447 }
 448
 449 static char *guess_defbranch(void)
 450 {
 451         const char *ref;
 452         unsigned char sha1[20];
 453
 454         ref = resolve_ref_unsafe("HEAD", sha1, 0, NULL);
 455         if (!ref || prefixcmp(ref, "refs/heads/"))
 456                 return "master";
 457         return xstrdup(ref + 11);
 458 }
 459
 460 static int prepare_repo_cmd(struct cgit_context *ctx)
 461 {
 462         char *user_home;
 463         char *xdg_home;
 464         unsigned char sha1[20];
 465         int nongit = 0;
 466         int rc;
 467
 468         /* The path to the git repository. */
 469         setenv("GIT_DIR", ctx->repo->path, 1);
 470
 471         /* Do not look in /etc/ for gitconfig and gitattributes. */
 472         setenv("GIT_CONFIG_NOSYSTEM", "1", 1);
 473         setenv("GIT_ATTR_NOSYSTEM", "1", 1);
 474
 475         /* We unset HOME and XDG_CONFIG_HOME before calling the git setup function
 476          * so that we don't make unneccessary filesystem accesses. */
 477         user_home = getenv("HOME");
 478         xdg_home = getenv("XDG_CONFIG_HOME");
 479         unsetenv("HOME");
 480         unsetenv("XDG_CONFIG_HOME");
 481
 482         /* Setup the git directory and initialize the notes system. Both of these
 483          * load local configuration from the git repository, so we do them both while
 484          * the HOME variables are unset. */
 485         setup_git_directory_gently(&nongit);
 486         init_display_notes(NULL);
 487
 488         /* We restore the unset variables afterward. */
 489         setenv("HOME", user_home, 1);
 490         setenv("XDG_CONFIG_HOME", xdg_home, 1);
 491
 492         if (nongit) {
 493                 const char *name = ctx->repo->name;
 494                 rc = errno;
 495                 ctx->page.title = fmtalloc("%s - %s", ctx->cfg.root_title,
 496                                                 "config error");
 497                 ctx->repo = NULL;
 498                 cgit_print_http_headers(ctx);
 499                 cgit_print_docstart(ctx);
 500                 cgit_print_pageheader(ctx);
 501                 cgit_print_error("Failed to open %s: %s", name,
 502                                  rc ? strerror(rc) : "Not a valid git repository");
 503                 cgit_print_docend();
 504                 return 1;
 505         }
 506         ctx->page.title = fmtalloc("%s - %s", ctx->repo->name, ctx->repo->desc);
 507
 508         if (!ctx->repo->defbranch)
 509                 ctx->repo->defbranch = guess_defbranch();
 510
 511         if (!ctx->qry.head) {
 512                 ctx->qry.nohead = 1;
 513                 ctx->qry.head = find_default_branch(ctx->repo);
 514         }
 515
 516         if (!ctx->qry.head) {
 517                 cgit_print_http_headers(ctx);
 518                 cgit_print_docstart(ctx);
 519                 cgit_print_pageheader(ctx);
 520                 cgit_print_error("Repository seems to be empty");
 521                 cgit_print_docend();
 522                 return 1;
 523         }
 524
 525         if (get_sha1(ctx->qry.head, sha1)) {
 526                 char *tmp = xstrdup(ctx->qry.head);
 527                 ctx->qry.head = ctx->repo->defbranch;
 528                 ctx->page.status = 404;
 529                 ctx->page.statusmsg = "Not found";
 530                 cgit_print_http_headers(ctx);
 531                 cgit_print_docstart(ctx);
 532                 cgit_print_pageheader(ctx);
 533                 cgit_print_error("Invalid branch: %s", tmp);
 534                 cgit_print_docend();
 535                 return 1;
 536         }
 537         sort_string_list(&ctx->repo->submodules);
 538         cgit_prepare_repo_env(ctx->repo);
 539         return 0;
 540 }
 541
 542 static void process_request(void *cbdata)
 543 {
 544         struct cgit_context *ctx = cbdata;
 545         struct cgit_cmd *cmd;
 546
 547         cmd = cgit_get_cmd(ctx);
 548         if (!cmd) {
 549                 ctx->page.title = "cgit error";
 550                 ctx->page.status = 404;
 551                 ctx->page.statusmsg = "Not found";
 552                 cgit_print_http_headers(ctx);
 553                 cgit_print_docstart(ctx);
 554                 cgit_print_pageheader(ctx);
 555                 cgit_print_error("Invalid request");
 556                 cgit_print_docend();
 557                 return;
 558         }
 559
 560         if (!ctx->cfg.enable_http_clone && cmd->is_clone) {
 561                 html_status(404, "Not found", 0);
 562                 return;
 563         }
 564
 565         /* If cmd->want_vpath is set, assume ctx->qry.path contains a "virtual"
 566          * in-project path limit to be made available at ctx->qry.vpath.
 567          * Otherwise, no path limit is in effect (ctx->qry.vpath = NULL).
 568          */
 569         ctx->qry.vpath = cmd->want_vpath ? ctx->qry.path : NULL;
 570
 571         if (cmd->want_repo && !ctx->repo) {
 572                 cgit_print_http_headers(ctx);
 573                 cgit_print_docstart(ctx);
 574                 cgit_print_pageheader(ctx);
 575                 cgit_print_error("No repository selected");
 576                 cgit_print_docend();
 577                 return;
 578         }
 579
 580         if (ctx->repo && prepare_repo_cmd(ctx))
 581                 return;
 582
 583         if (cmd->want_layout) {
 584                 cgit_print_http_headers(ctx);
 585                 cgit_print_docstart(ctx);
 586                 cgit_print_pageheader(ctx);
 587         }
 588
 589         cmd->fn(ctx);
 590
 591         if (cmd->want_layout)
 592                 cgit_print_docend();
 593 }
 594
 595 static int cmp_repos(const void *a, const void *b)
 596 {
 597         const struct cgit_repo *ra = a, *rb = b;
 598         return strcmp(ra->url, rb->url);
 599 }
 600
 601 static char *build_snapshot_setting(int bitmap)
 602 {
 603         const struct cgit_snapshot_format *f;
 604         struct strbuf result = STRBUF_INIT;
 605
 606         for (f = cgit_snapshot_formats; f->suffix; f++) {
 607                 if (f->bit & bitmap) {
 608                         if (result.len)
 609                                 strbuf_addch(&result, ' ');
 610                         strbuf_addstr(&result, f->suffix);
 611                 }
 612         }
 613         return strbuf_detach(&result, NULL);
 614 }
 615
 616 static char *get_first_line(char *txt)
 617 {
 618         char *t = xstrdup(txt);
 619         char *p = strchr(t, '\n');
 620         if (p)
 621                 *p = '\0';
 622         return t;
 623 }
 624
 625 static void print_repo(FILE *f, struct cgit_repo *repo)
 626 {
 627         fprintf(f, "repo.url=%s\n", repo->url);
 628         fprintf(f, "repo.name=%s\n", repo->name);
 629         fprintf(f, "repo.path=%s\n", repo->path);
 630         if (repo->owner)
 631                 fprintf(f, "repo.owner=%s\n", repo->owner);
 632         if (repo->desc) {
 633                 char *tmp = get_first_line(repo->desc);
 634                 fprintf(f, "repo.desc=%s\n", tmp);
 635                 free(tmp);
 636         }
 637         if (repo->readme)
 638                 fprintf(f, "repo.readme=%s\n", repo->readme);
 639         if (repo->defbranch)
 640                 fprintf(f, "repo.defbranch=%s\n", repo->defbranch);
 641         if (repo->module_link)
 642                 fprintf(f, "repo.module-link=%s\n", repo->module_link);
 643         if (repo->section)
 644                 fprintf(f, "repo.section=%s\n", repo->section);
 645         if (repo->clone_url)
 646                 fprintf(f, "repo.clone-url=%s\n", repo->clone_url);
 647         fprintf(f, "repo.enable-commit-graph=%d\n",
 648                 repo->enable_commit_graph);
 649         fprintf(f, "repo.enable-log-filecount=%d\n",
 650                 repo->enable_log_filecount);
 651         fprintf(f, "repo.enable-log-linecount=%d\n",
 652                 repo->enable_log_linecount);
 653         if (repo->about_filter && repo->about_filter != ctx.cfg.about_filter)
 654                 fprintf(f, "repo.about-filter=%s\n", repo->about_filter->cmd);
 655         if (repo->commit_filter && repo->commit_filter != ctx.cfg.commit_filter)
 656                 fprintf(f, "repo.commit-filter=%s\n", repo->commit_filter->cmd);
 657         if (repo->source_filter && repo->source_filter != ctx.cfg.source_filter)
 658                 fprintf(f, "repo.source-filter=%s\n", repo->source_filter->cmd);
 659         if (repo->snapshots != ctx.cfg.snapshots) {
 660                 char *tmp = build_snapshot_setting(repo->snapshots);
 661                 fprintf(f, "repo.snapshots=%s\n", tmp ? tmp : "");
 662                 free(tmp);
 663         }
 664         if (repo->max_stats != ctx.cfg.max_stats)
 665                 fprintf(f, "repo.max-stats=%s\n",
 666                         cgit_find_stats_periodname(repo->max_stats));
 667         fprintf(f, "\n");
 668 }
 669
 670 static void print_repolist(FILE *f, struct cgit_repolist *list, int start)
 671 {
 672         int i;
 673
 674         for (i = start; i < list->count; i++)
 675                 print_repo(f, &list->repos[i]);
 676 }
 677
 678 /* Scan 'path' for git repositories, save the resulting repolist in 'cached_rc'
 679  * and return 0 on success.
 680  */
 681 static int generate_cached_repolist(const char *path, const char *cached_rc)
 682 {
 683         struct strbuf locked_rc = STRBUF_INIT;
 684         int result = 0;
 685         int idx;
 686         FILE *f;
 687
 688         strbuf_addf(&locked_rc, "%s.lock", cached_rc);
 689         f = fopen(locked_rc.buf, "wx");
 690         if (!f) {
 691                 /* Inform about the error unless the lockfile already existed,
 692                  * since that only means we've got concurrent requests.
 693                  */
 694                 result = errno;
 695                 if (result != EEXIST)
 696                         fprintf(stderr, "[cgit] Error opening %s: %s (%d)\n",
 697                                 locked_rc.buf, strerror(result), result);
 698                 goto out;
 699         }
 700         idx = cgit_repolist.count;
 701         if (ctx.cfg.project_list)
 702                 scan_projects(path, ctx.cfg.project_list, repo_config);
 703         else
 704                 scan_tree(path, repo_config);
 705         print_repolist(f, &cgit_repolist, idx);
 706         if (rename(locked_rc.buf, cached_rc))
 707                 fprintf(stderr, "[cgit] Error renaming %s to %s: %s (%d)\n",
 708                         locked_rc.buf, cached_rc, strerror(errno), errno);
 709         fclose(f);
 710 out:
 711         strbuf_release(&locked_rc);
 712         return result;
 713 }
 714
 715 static void process_cached_repolist(const char *path)
 716 {
 717         struct stat st;
 718         struct strbuf cached_rc = STRBUF_INIT;
 719         time_t age;
 720         unsigned long hash;
 721
 722         hash = hash_str(path);
 723         if (ctx.cfg.project_list)
 724                 hash += hash_str(ctx.cfg.project_list);
 725         strbuf_addf(&cached_rc, "%s/rc-%8lx", ctx.cfg.cache_root, hash);
 726
 727         if (stat(cached_rc.buf, &st)) {
 728                 /* Nothing is cached, we need to scan without forking. And
 729                  * if we fail to generate a cached repolist, we need to
 730                  * invoke scan_tree manually.
 731                  */
 732                 if (generate_cached_repolist(path, cached_rc.buf)) {
 733                         if (ctx.cfg.project_list)
 734                                 scan_projects(path, ctx.cfg.project_list,
 735                                               repo_config);
 736                         else
 737                                 scan_tree(path, repo_config);
 738                 }
 739                 goto out;
 740         }
 741
 742         parse_configfile(cached_rc.buf, config_cb);
 743
 744         /* If the cached configfile hasn't expired, lets exit now */
 745         age = time(NULL) - st.st_mtime;
 746         if (age <= (ctx.cfg.cache_scanrc_ttl * 60))
 747                 goto out;
 748
 749         /* The cached repolist has been parsed, but it was old. So lets
 750          * rescan the specified path and generate a new cached repolist
 751          * in a child-process to avoid latency for the current request.
 752          */
 753         if (fork())
 754                 goto out;
 755
 756         exit(generate_cached_repolist(path, cached_rc.buf));
 757 out:
 758         strbuf_release(&cached_rc);
 759 }
 760
 761 static void cgit_parse_args(int argc, const char **argv)
 762 {
 763         int i;
 764         int scan = 0;
 765
 766         for (i = 1; i < argc; i++) {
 767                 if (!strncmp(argv[i], "--cache=", 8)) {
 768                         ctx.cfg.cache_root = xstrdup(argv[i] + 8);
 769                 }
 770                 if (!strcmp(argv[i], "--nocache")) {
 771                         ctx.cfg.nocache = 1;
 772                 }
 773                 if (!strcmp(argv[i], "--nohttp")) {
 774                         ctx.env.no_http = "1";
 775                 }
 776                 if (!strncmp(argv[i], "--query=", 8)) {
 777                         ctx.qry.raw = xstrdup(argv[i] + 8);
 778                 }
 779                 if (!strncmp(argv[i], "--repo=", 7)) {
 780                         ctx.qry.repo = xstrdup(argv[i] + 7);
 781                 }
 782                 if (!strncmp(argv[i], "--page=", 7)) {
 783                         ctx.qry.page = xstrdup(argv[i] + 7);
 784                 }
 785                 if (!strncmp(argv[i], "--head=", 7)) {
 786                         ctx.qry.head = xstrdup(argv[i] + 7);
 787                         ctx.qry.has_symref = 1;
 788                 }
 789                 if (!strncmp(argv[i], "--sha1=", 7)) {
 790                         ctx.qry.sha1 = xstrdup(argv[i] + 7);
 791                         ctx.qry.has_sha1 = 1;
 792                 }
 793                 if (!strncmp(argv[i], "--ofs=", 6)) {
 794                         ctx.qry.ofs = atoi(argv[i] + 6);
 795                 }
 796                 if (!strncmp(argv[i], "--scan-tree=", 12) ||
 797                     !strncmp(argv[i], "--scan-path=", 12)) {
 798                         /* HACK: the global snapshot bitmask defines the
 799                          * set of allowed snapshot formats, but the config
 800                          * file hasn't been parsed yet so the mask is
 801                          * currently 0. By setting all bits high before
 802                          * scanning we make sure that any in-repo cgitrc
 803                          * snapshot setting is respected by scan_tree().
 804                          * BTW: we assume that there'll never be more than
 805                          * 255 different snapshot formats supported by cgit...
 806                          */
 807                         ctx.cfg.snapshots = 0xFF;
 808                         scan++;
 809                         scan_tree(argv[i] + 12, repo_config);
 810                 }
 811         }
 812         if (scan) {
 813                 qsort(cgit_repolist.repos, cgit_repolist.count,
 814                         sizeof(struct cgit_repo), cmp_repos);
 815                 print_repolist(stdout, &cgit_repolist, 0);
 816                 exit(0);
 817         }
 818 }
 819
 820 static int calc_ttl()
 821 {
 822         if (!ctx.repo)
 823                 return ctx.cfg.cache_root_ttl;
 824
 825         if (!ctx.qry.page)
 826                 return ctx.cfg.cache_repo_ttl;
 827
 828         if (ctx.qry.has_symref)
 829                 return ctx.cfg.cache_dynamic_ttl;
 830
 831         if (ctx.qry.has_sha1)
 832                 return ctx.cfg.cache_static_ttl;
 833
 834         return ctx.cfg.cache_repo_ttl;
 835 }
 836
 837 int main(int argc, const char **argv)
 838 {
 839         const char *path;
 840         int err, ttl;
 841
 842         prepare_context(&ctx);
 843         cgit_repolist.length = 0;
 844         cgit_repolist.count = 0;
 845         cgit_repolist.repos = NULL;
 846
 847         cgit_parse_args(argc, argv);
 848         parse_configfile(expand_macros(ctx.env.cgit_config), config_cb);
 849         ctx.repo = NULL;
 850         http_parse_querystring(ctx.qry.raw, querystring_cb);
 851
 852         /* If virtual-root isn't specified in cgitrc, lets pretend
 853          * that virtual-root equals SCRIPT_NAME, minus any possibly
 854          * trailing slashes.
 855          */
 856         if (!ctx.cfg.virtual_root && ctx.cfg.script_name)
 857                 ctx.cfg.virtual_root = ensure_end(ctx.cfg.script_name, '/');
 858
 859         /* If no url parameter is specified on the querystring, lets
 860          * use PATH_INFO as url. This allows cgit to work with virtual
 861          * urls without the need for rewriterules in the webserver (as
 862          * long as PATH_INFO is included in the cache lookup key).
 863          */
 864         path = ctx.env.path_info;
 865         if (!ctx.qry.url && path) {
 866                 if (path[0] == '/')
 867                         path++;
 868                 ctx.qry.url = xstrdup(path);
 869                 if (ctx.qry.raw) {
 870                         char *newqry = fmtalloc("%s?%s", path, ctx.qry.raw);
 871                         free(ctx.qry.raw);
 872                         ctx.qry.raw = newqry;
 873                 } else
 874                         ctx.qry.raw = xstrdup(ctx.qry.url);
 875                 cgit_parse_url(ctx.qry.url);
 876         }
 877
 878         ttl = calc_ttl();
 879         ctx.page.expires += ttl * 60;
 880         if (ctx.env.request_method && !strcmp(ctx.env.request_method, "HEAD"))
 881                 ctx.cfg.nocache = 1;
 882         if (ctx.cfg.nocache)
 883                 ctx.cfg.cache_size = 0;
 884         err = cache_process(ctx.cfg.cache_size, ctx.cfg.cache_root,
 885                             ctx.qry.raw, ttl, process_request, &ctx);
 886         if (err)
 887                 cgit_print_error("Error processing page: %s (%d)",
 888                                  strerror(err), err);
 889         return err;
 890 }