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