cgit.c

   1 /* cgit.c: cgi for the git scm
   2  *
   3  * Copyright (C) 2006 Lars Hjemli
   4  *
   5  * Licensed under GNU General Public License v2
   6  *   (see COPYING for full license text)
   7  */
   8
   9 #include "cgit.h"
  10 #include "cache.h"
  11 #include "cmd.h"
  12 #include "configfile.h"
  13 #include "html.h"
  14 #include "ui-shared.h"
  15 #include "ui-stats.h"
  16 #include "scan-tree.h"
  17
  18 const char *cgit_version = CGIT_VERSION;
  19
  20 void add_mimetype(const char *name, const char *value)
  21 {
  22         struct string_list_item *item;
  23
  24         item = string_list_insert(xstrdup(name), &ctx.cfg.mimetypes);
  25         item->util = xstrdup(value);
  26 }
  27
  28 struct cgit_filter *new_filter(const char *cmd, int extra_args)
  29 {
  30         struct cgit_filter *f;
  31
  32         if (!cmd || !cmd[0])
  33                 return NULL;
  34
  35         f = xmalloc(sizeof(struct cgit_filter));
  36         f->cmd = xstrdup(cmd);
  37         f->argv = xmalloc((2 + extra_args) * sizeof(char *));
  38         f->argv[0] = f->cmd;
  39         f->argv[1] = NULL;
  40         return f;
  41 }
  42
  43 static void process_cached_repolist(const char *path);
  44
  45 void repo_config(struct cgit_repo *repo, const char *name, const char *value)
  46 {
  47         if (!strcmp(name, "name"))
  48                 repo->name = xstrdup(value);
  49         else if (!strcmp(name, "clone-url"))
  50                 repo->clone_url = xstrdup(value);
  51         else if (!strcmp(name, "desc"))
  52                 repo->desc = xstrdup(value);
  53         else if (!strcmp(name, "owner"))
  54                 repo->owner = xstrdup(value);
  55         else if (!strcmp(name, "defbranch"))
  56                 repo->defbranch = xstrdup(value);
  57         else if (!strcmp(name, "snapshots"))
  58                 repo->snapshots = ctx.cfg.snapshots & cgit_parse_snapshots_mask(value);
  59         else if (!strcmp(name, "enable-log-filecount"))
  60                 repo->enable_log_filecount = ctx.cfg.enable_log_filecount * atoi(value);
  61         else if (!strcmp(name, "enable-log-linecount"))
  62                 repo->enable_log_linecount = ctx.cfg.enable_log_linecount * atoi(value);
  63         else if (!strcmp(name, "enable-remote-branches"))
  64                 repo->enable_remote_branches = atoi(value);
  65         else if (!strcmp(name, "enable-subject-links"))
  66                 repo->enable_subject_links = atoi(value);
  67         else if (!strcmp(name, "max-stats"))
  68                 repo->max_stats = cgit_find_stats_period(value, NULL);
  69         else if (!strcmp(name, "module-link"))
  70                 repo->module_link= xstrdup(value);
  71         else if (!strcmp(name, "section"))
  72                 repo->section = xstrdup(value);
  73         else if (!strcmp(name, "readme") && value != NULL) {
  74                 if (*value == '/')
  75                         repo->readme = xstrdup(value);
  76                 else
  77                         repo->readme = xstrdup(fmt("%s/%s", repo->path, value));
  78         } else if (ctx.cfg.enable_filter_overrides) {
  79                 if (!strcmp(name, "about-filter"))
  80                         repo->about_filter = new_filter(value, 0);
  81                 else if (!strcmp(name, "commit-filter"))
  82                         repo->commit_filter = new_filter(value, 0);
  83                 else if (!strcmp(name, "source-filter"))
  84                         repo->source_filter = new_filter(value, 1);
  85         }
  86 }
  87
  88 void config_cb(const char *name, const char *value)
  89 {
  90         if (!strcmp(name, "section") || !strcmp(name, "repo.group"))
  91                 ctx.cfg.section = xstrdup(value);
  92         else if (!strcmp(name, "repo.url"))
  93                 ctx.repo = cgit_add_repo(value);
  94         else if (ctx.repo && !strcmp(name, "repo.path"))
  95                 ctx.repo->path = trim_end(value, '/');
  96         else if (ctx.repo && !prefixcmp(name, "repo."))
  97                 repo_config(ctx.repo, name + 5, value);
  98         else if (!strcmp(name, "root-title"))
  99                 ctx.cfg.root_title = xstrdup(value);
 100         else if (!strcmp(name, "root-desc"))
 101                 ctx.cfg.root_desc = xstrdup(value);
 102         else if (!strcmp(name, "root-readme"))
 103                 ctx.cfg.root_readme = xstrdup(value);
 104         else if (!strcmp(name, "css"))
 105                 ctx.cfg.css = xstrdup(value);
 106         else if (!strcmp(name, "favicon"))
 107                 ctx.cfg.favicon = xstrdup(value);
 108         else if (!strcmp(name, "footer"))
 109                 ctx.cfg.footer = xstrdup(value);
 110         else if (!strcmp(name, "head-include"))
 111                 ctx.cfg.head_include = xstrdup(value);
 112         else if (!strcmp(name, "header"))
 113                 ctx.cfg.header = xstrdup(value);
 114         else if (!strcmp(name, "logo"))
 115                 ctx.cfg.logo = xstrdup(value);
 116         else if (!strcmp(name, "index-header"))
 117                 ctx.cfg.index_header = xstrdup(value);
 118         else if (!strcmp(name, "index-info"))
 119                 ctx.cfg.index_info = xstrdup(value);
 120         else if (!strcmp(name, "logo-link"))
 121                 ctx.cfg.logo_link = xstrdup(value);
 122         else if (!strcmp(name, "module-link"))
 123                 ctx.cfg.module_link = xstrdup(value);
 124         else if (!strcmp(name, "virtual-root")) {
 125                 ctx.cfg.virtual_root = trim_end(value, '/');
 126                 if (!ctx.cfg.virtual_root && (!strcmp(value, "/")))
 127                         ctx.cfg.virtual_root = "";
 128         } else if (!strcmp(name, "nocache"))
 129                 ctx.cfg.nocache = atoi(value);
 130         else if (!strcmp(name, "noplainemail"))
 131                 ctx.cfg.noplainemail = atoi(value);
 132         else if (!strcmp(name, "noheader"))
 133                 ctx.cfg.noheader = atoi(value);
 134         else if (!strcmp(name, "snapshots"))
 135                 ctx.cfg.snapshots = cgit_parse_snapshots_mask(value);
 136         else if (!strcmp(name, "enable-filter-overrides"))
 137                 ctx.cfg.enable_filter_overrides = atoi(value);
 138         else if (!strcmp(name, "enable-index-links"))
 139                 ctx.cfg.enable_index_links = atoi(value);
 140         else if (!strcmp(name, "enable-log-filecount"))
 141                 ctx.cfg.enable_log_filecount = atoi(value);
 142         else if (!strcmp(name, "enable-log-linecount"))
 143                 ctx.cfg.enable_log_linecount = atoi(value);
 144         else if (!strcmp(name, "enable-remote-branches"))
 145                 ctx.cfg.enable_remote_branches = atoi(value);
 146         else if (!strcmp(name, "enable-subject-links"))
 147                 ctx.cfg.enable_subject_links = atoi(value);
 148         else if (!strcmp(name, "enable-tree-linenumbers"))
 149                 ctx.cfg.enable_tree_linenumbers = atoi(value);
 150         else if (!strcmp(name, "max-stats"))
 151                 ctx.cfg.max_stats = cgit_find_stats_period(value, NULL);
 152         else if (!strcmp(name, "cache-size"))
 153                 ctx.cfg.cache_size = atoi(value);
 154         else if (!strcmp(name, "cache-root"))
 155                 ctx.cfg.cache_root = xstrdup(value);
 156         else if (!strcmp(name, "cache-root-ttl"))
 157                 ctx.cfg.cache_root_ttl = atoi(value);
 158         else if (!strcmp(name, "cache-repo-ttl"))
 159                 ctx.cfg.cache_repo_ttl = atoi(value);
 160         else if (!strcmp(name, "cache-scanrc-ttl"))
 161                 ctx.cfg.cache_scanrc_ttl = atoi(value);
 162         else if (!strcmp(name, "cache-static-ttl"))
 163                 ctx.cfg.cache_static_ttl = atoi(value);
 164         else if (!strcmp(name, "cache-dynamic-ttl"))
 165                 ctx.cfg.cache_dynamic_ttl = atoi(value);
 166         else if (!strcmp(name, "about-filter"))
 167                 ctx.cfg.about_filter = new_filter(value, 0);
 168         else if (!strcmp(name, "commit-filter"))
 169                 ctx.cfg.commit_filter = new_filter(value, 0);
 170         else if (!strcmp(name, "embedded"))
 171                 ctx.cfg.embedded = atoi(value);
 172         else if (!strcmp(name, "max-atom-items"))
 173                 ctx.cfg.max_atom_items = atoi(value);
 174         else if (!strcmp(name, "max-message-length"))
 175                 ctx.cfg.max_msg_len = atoi(value);
 176         else if (!strcmp(name, "max-repodesc-length"))
 177                 ctx.cfg.max_repodesc_len = atoi(value);
 178         else if (!strcmp(name, "max-blob-size"))
 179                 ctx.cfg.max_blob_size = atoi(value);
 180         else if (!strcmp(name, "max-repo-count"))
 181                 ctx.cfg.max_repo_count = atoi(value);
 182         else if (!strcmp(name, "max-commit-count"))
 183                 ctx.cfg.max_commit_count = atoi(value);
 184         else if (!strcmp(name, "scan-path"))
 185                 if (!ctx.cfg.nocache && ctx.cfg.cache_size)
 186                         process_cached_repolist(value);
 187                 else
 188                         scan_tree(value, repo_config);
 189         else if (!strcmp(name, "source-filter"))
 190                 ctx.cfg.source_filter = new_filter(value, 1);
 191         else if (!strcmp(name, "summary-log"))
 192                 ctx.cfg.summary_log = atoi(value);
 193         else if (!strcmp(name, "summary-branches"))
 194                 ctx.cfg.summary_branches = atoi(value);
 195         else if (!strcmp(name, "summary-tags"))
 196                 ctx.cfg.summary_tags = atoi(value);
 197         else if (!strcmp(name, "side-by-side-diffs"))
 198                 ctx.cfg.ssdiff = atoi(value);
 199         else if (!strcmp(name, "agefile"))
 200                 ctx.cfg.agefile = xstrdup(value);
 201         else if (!strcmp(name, "renamelimit"))
 202                 ctx.cfg.renamelimit = atoi(value);
 203         else if (!strcmp(name, "robots"))
 204                 ctx.cfg.robots = xstrdup(value);
 205         else if (!strcmp(name, "clone-prefix"))
 206                 ctx.cfg.clone_prefix = xstrdup(value);
 207         else if (!strcmp(name, "local-time"))
 208                 ctx.cfg.local_time = atoi(value);
 209         else if (!prefixcmp(name, "mimetype."))
 210                 add_mimetype(name + 9, value);
 211         else if (!strcmp(name, "include"))
 212                 parse_configfile(value, config_cb);
 213 }
 214
 215 static void querystring_cb(const char *name, const char *value)
 216 {
 217         if (!value)
 218                 value = "";
 219
 220         if (!strcmp(name,"r")) {
 221                 ctx.qry.repo = xstrdup(value);
 222                 ctx.repo = cgit_get_repoinfo(value);
 223         } else if (!strcmp(name, "p")) {
 224                 ctx.qry.page = xstrdup(value);
 225         } else if (!strcmp(name, "url")) {
 226                 if (*value == '/')
 227                         value++;
 228                 ctx.qry.url = xstrdup(value);
 229                 cgit_parse_url(value);
 230         } else if (!strcmp(name, "qt")) {
 231                 ctx.qry.grep = xstrdup(value);
 232         } else if (!strcmp(name, "q")) {
 233                 ctx.qry.search = xstrdup(value);
 234         } else if (!strcmp(name, "h")) {
 235                 ctx.qry.head = xstrdup(value);
 236                 ctx.qry.has_symref = 1;
 237         } else if (!strcmp(name, "id")) {
 238                 ctx.qry.sha1 = xstrdup(value);
 239                 ctx.qry.has_sha1 = 1;
 240         } else if (!strcmp(name, "id2")) {
 241                 ctx.qry.sha2 = xstrdup(value);
 242                 ctx.qry.has_sha1 = 1;
 243         } else if (!strcmp(name, "ofs")) {
 244                 ctx.qry.ofs = atoi(value);
 245         } else if (!strcmp(name, "path")) {
 246                 ctx.qry.path = trim_end(value, '/');
 247         } else if (!strcmp(name, "name")) {
 248                 ctx.qry.name = xstrdup(value);
 249         } else if (!strcmp(name, "mimetype")) {
 250                 ctx.qry.mimetype = xstrdup(value);
 251         } else if (!strcmp(name, "s")){
 252                 ctx.qry.sort = xstrdup(value);
 253         } else if (!strcmp(name, "showmsg")) {
 254                 ctx.qry.showmsg = atoi(value);
 255         } else if (!strcmp(name, "period")) {
 256                 ctx.qry.period = xstrdup(value);
 257         } else if (!strcmp(name, "ss")) {
 258                 ctx.qry.ssdiff = atoi(value);
 259         } else if (!strcmp(name, "all")) {
 260                 ctx.qry.show_all = atoi(value);
 261         } else if (!strcmp(name, "context")) {
 262                 ctx.qry.context = atoi(value);
 263         }
 264 }
 265
 266 char *xstrdupn(const char *str)
 267 {
 268         return (str ? xstrdup(str) : NULL);
 269 }
 270
 271 static void prepare_context(struct cgit_context *ctx)
 272 {
 273         memset(ctx, 0, sizeof(*ctx));
 274         ctx->cfg.agefile = "info/web/last-modified";
 275         ctx->cfg.nocache = 0;
 276         ctx->cfg.cache_size = 0;
 277         ctx->cfg.cache_dynamic_ttl = 5;
 278         ctx->cfg.cache_max_create_time = 5;
 279         ctx->cfg.cache_repo_ttl = 5;
 280         ctx->cfg.cache_root = CGIT_CACHE_ROOT;
 281         ctx->cfg.cache_root_ttl = 5;
 282         ctx->cfg.cache_scanrc_ttl = 15;
 283         ctx->cfg.cache_static_ttl = -1;
 284         ctx->cfg.css = "/cgit.css";
 285         ctx->cfg.logo = "/cgit.png";
 286         ctx->cfg.local_time = 0;
 287         ctx->cfg.enable_tree_linenumbers = 1;
 288         ctx->cfg.max_repo_count = 50;
 289         ctx->cfg.max_commit_count = 50;
 290         ctx->cfg.max_lock_attempts = 5;
 291         ctx->cfg.max_msg_len = 80;
 292         ctx->cfg.max_repodesc_len = 80;
 293         ctx->cfg.max_blob_size = 0;
 294         ctx->cfg.max_stats = 0;
 295         ctx->cfg.module_link = "./?repo=%s&page=commit&id=%s";
 296         ctx->cfg.renamelimit = -1;
 297         ctx->cfg.robots = "index, nofollow";
 298         ctx->cfg.root_title = "Git repository browser";
 299         ctx->cfg.root_desc = "a fast webinterface for the git dscm";
 300         ctx->cfg.script_name = CGIT_SCRIPT_NAME;
 301         ctx->cfg.section = "";
 302         ctx->cfg.summary_branches = 10;
 303         ctx->cfg.summary_log = 10;
 304         ctx->cfg.summary_tags = 10;
 305         ctx->cfg.max_atom_items = 10;
 306         ctx->cfg.ssdiff = 0;
 307         ctx->env.cgit_config = xstrdupn(getenv("CGIT_CONFIG"));
 308         ctx->env.http_host = xstrdupn(getenv("HTTP_HOST"));
 309         ctx->env.https = xstrdupn(getenv("HTTPS"));
 310         ctx->env.no_http = xstrdupn(getenv("NO_HTTP"));
 311         ctx->env.path_info = xstrdupn(getenv("PATH_INFO"));
 312         ctx->env.query_string = xstrdupn(getenv("QUERY_STRING"));
 313         ctx->env.request_method = xstrdupn(getenv("REQUEST_METHOD"));
 314         ctx->env.script_name = xstrdupn(getenv("SCRIPT_NAME"));
 315         ctx->env.server_name = xstrdupn(getenv("SERVER_NAME"));
 316         ctx->env.server_port = xstrdupn(getenv("SERVER_PORT"));
 317         ctx->page.mimetype = "text/html";
 318         ctx->page.charset = PAGE_ENCODING;
 319         ctx->page.filename = NULL;
 320         ctx->page.size = 0;
 321         ctx->page.modified = time(NULL);
 322         ctx->page.expires = ctx->page.modified;
 323         ctx->page.etag = NULL;
 324         memset(&ctx->cfg.mimetypes, 0, sizeof(struct string_list));
 325         if (ctx->env.script_name)
 326                 ctx->cfg.script_name = ctx->env.script_name;
 327         if (ctx->env.query_string)
 328                 ctx->qry.raw = ctx->env.query_string;
 329         if (!ctx->env.cgit_config)
 330                 ctx->env.cgit_config = CGIT_CONFIG;
 331 }
 332
 333 struct refmatch {
 334         char *req_ref;
 335         char *first_ref;
 336         int match;
 337 };
 338
 339 int find_current_ref(const char *refname, const unsigned char *sha1,
 340                      int flags, void *cb_data)
 341 {
 342         struct refmatch *info;
 343
 344         info = (struct refmatch *)cb_data;
 345         if (!strcmp(refname, info->req_ref))
 346                 info->match = 1;
 347         if (!info->first_ref)
 348                 info->first_ref = xstrdup(refname);
 349         return info->match;
 350 }
 351
 352 char *find_default_branch(struct cgit_repo *repo)
 353 {
 354         struct refmatch info;
 355         char *ref;
 356
 357         info.req_ref = repo->defbranch;
 358         info.first_ref = NULL;
 359         info.match = 0;
 360         for_each_branch_ref(find_current_ref, &info);
 361         if (info.match)
 362                 ref = info.req_ref;
 363         else
 364                 ref = info.first_ref;
 365         if (ref)
 366                 ref = xstrdup(ref);
 367         return ref;
 368 }
 369
 370 static int prepare_repo_cmd(struct cgit_context *ctx)
 371 {
 372         char *tmp;
 373         unsigned char sha1[20];
 374         int nongit = 0;
 375
 376         setenv("GIT_DIR", ctx->repo->path, 1);
 377         setup_git_directory_gently(&nongit);
 378         if (nongit) {
 379                 ctx->page.title = fmt("%s - %s", ctx->cfg.root_title,
 380                                       "config error");
 381                 tmp = fmt("Not a git repository: '%s'", ctx->repo->path);
 382                 ctx->repo = NULL;
 383                 cgit_print_http_headers(ctx);
 384                 cgit_print_docstart(ctx);
 385                 cgit_print_pageheader(ctx);
 386                 cgit_print_error(tmp);
 387                 cgit_print_docend();
 388                 return 1;
 389         }
 390         ctx->page.title = fmt("%s - %s", ctx->repo->name, ctx->repo->desc);
 391
 392         if (!ctx->qry.head) {
 393                 ctx->qry.nohead = 1;
 394                 ctx->qry.head = find_default_branch(ctx->repo);
 395                 ctx->repo->defbranch = ctx->qry.head;
 396         }
 397
 398         if (!ctx->qry.head) {
 399                 cgit_print_http_headers(ctx);
 400                 cgit_print_docstart(ctx);
 401                 cgit_print_pageheader(ctx);
 402                 cgit_print_error("Repository seems to be empty");
 403                 cgit_print_docend();
 404                 return 1;
 405         }
 406
 407         if (get_sha1(ctx->qry.head, sha1)) {
 408                 tmp = xstrdup(ctx->qry.head);
 409                 ctx->qry.head = ctx->repo->defbranch;
 410                 ctx->page.status = 404;
 411                 ctx->page.statusmsg = "not found";
 412                 cgit_print_http_headers(ctx);
 413                 cgit_print_docstart(ctx);
 414                 cgit_print_pageheader(ctx);
 415                 cgit_print_error(fmt("Invalid branch: %s", tmp));
 416                 cgit_print_docend();
 417                 return 1;
 418         }
 419         return 0;
 420 }
 421
 422 static void process_request(void *cbdata)
 423 {
 424         struct cgit_context *ctx = cbdata;
 425         struct cgit_cmd *cmd;
 426
 427         cmd = cgit_get_cmd(ctx);
 428         if (!cmd) {
 429                 ctx->page.title = "cgit error";
 430                 cgit_print_http_headers(ctx);
 431                 cgit_print_docstart(ctx);
 432                 cgit_print_pageheader(ctx);
 433                 cgit_print_error("Invalid request");
 434                 cgit_print_docend();
 435                 return;
 436         }
 437
 438         /* If cmd->want_vpath is set, assume ctx->qry.path contains a "virtual"
 439          * in-project path limit to be made available at ctx->qry.vpath.
 440          * Otherwise, no path limit is in effect (ctx->qry.vpath = NULL).
 441          */
 442         ctx->qry.vpath = cmd->want_vpath ? ctx->qry.path : NULL;
 443
 444         if (cmd->want_repo && !ctx->repo) {
 445                 cgit_print_http_headers(ctx);
 446                 cgit_print_docstart(ctx);
 447                 cgit_print_pageheader(ctx);
 448                 cgit_print_error(fmt("No repository selected"));
 449                 cgit_print_docend();
 450                 return;
 451         }
 452
 453         if (ctx->repo && prepare_repo_cmd(ctx))
 454                 return;
 455
 456         if (cmd->want_layout) {
 457                 cgit_print_http_headers(ctx);
 458                 cgit_print_docstart(ctx);
 459                 cgit_print_pageheader(ctx);
 460         }
 461
 462         cmd->fn(ctx);
 463
 464         if (cmd->want_layout)
 465                 cgit_print_docend();
 466 }
 467
 468 int cmp_repos(const void *a, const void *b)
 469 {
 470         const struct cgit_repo *ra = a, *rb = b;
 471         return strcmp(ra->url, rb->url);
 472 }
 473
 474 char *build_snapshot_setting(int bitmap)
 475 {
 476         const struct cgit_snapshot_format *f;
 477         char *result = xstrdup("");
 478         char *tmp;
 479         int len;
 480
 481         for (f = cgit_snapshot_formats; f->suffix; f++) {
 482                 if (f->bit & bitmap) {
 483                         tmp = result;
 484                         result = xstrdup(fmt("%s%s ", tmp, f->suffix));
 485                         free(tmp);
 486                 }
 487         }
 488         len = strlen(result);
 489         if (len)
 490                 result[len - 1] = '\0';
 491         return result;
 492 }
 493
 494 char *get_first_line(char *txt)
 495 {
 496         char *t = xstrdup(txt);
 497         char *p = strchr(t, '\n');
 498         if (p)
 499                 *p = '\0';
 500         return t;
 501 }
 502
 503 void print_repo(FILE *f, struct cgit_repo *repo)
 504 {
 505         fprintf(f, "repo.url=%s\n", repo->url);
 506         fprintf(f, "repo.name=%s\n", repo->name);
 507         fprintf(f, "repo.path=%s\n", repo->path);
 508         if (repo->owner)
 509                 fprintf(f, "repo.owner=%s\n", repo->owner);
 510         if (repo->desc) {
 511                 char *tmp = get_first_line(repo->desc);
 512                 fprintf(f, "repo.desc=%s\n", tmp);
 513                 free(tmp);
 514         }
 515         if (repo->readme)
 516                 fprintf(f, "repo.readme=%s\n", repo->readme);
 517         if (repo->defbranch)
 518                 fprintf(f, "repo.defbranch=%s\n", repo->defbranch);
 519         if (repo->module_link)
 520                 fprintf(f, "repo.module-link=%s\n", repo->module_link);
 521         if (repo->section)
 522                 fprintf(f, "repo.section=%s\n", repo->section);
 523         if (repo->clone_url)
 524                 fprintf(f, "repo.clone-url=%s\n", repo->clone_url);
 525         fprintf(f, "repo.enable-log-filecount=%d\n",
 526                 repo->enable_log_filecount);
 527         fprintf(f, "repo.enable-log-linecount=%d\n",
 528                 repo->enable_log_linecount);
 529         if (repo->about_filter && repo->about_filter != ctx.cfg.about_filter)
 530                 fprintf(f, "repo.about-filter=%s\n", repo->about_filter->cmd);
 531         if (repo->commit_filter && repo->commit_filter != ctx.cfg.commit_filter)
 532                 fprintf(f, "repo.commit-filter=%s\n", repo->commit_filter->cmd);
 533         if (repo->source_filter && repo->source_filter != ctx.cfg.source_filter)
 534                 fprintf(f, "repo.source-filter=%s\n", repo->source_filter->cmd);
 535         if (repo->snapshots != ctx.cfg.snapshots) {
 536                 char *tmp = build_snapshot_setting(repo->snapshots);
 537                 fprintf(f, "repo.snapshots=%s\n", tmp);
 538                 free(tmp);
 539         }
 540         if (repo->max_stats != ctx.cfg.max_stats)
 541                 fprintf(f, "repo.max-stats=%s\n",
 542                         cgit_find_stats_periodname(repo->max_stats));
 543         fprintf(f, "\n");
 544 }
 545
 546 void print_repolist(FILE *f, struct cgit_repolist *list, int start)
 547 {
 548         int i;
 549
 550         for(i = start; i < list->count; i++)
 551                 print_repo(f, &list->repos[i]);
 552 }
 553
 554 /* Scan 'path' for git repositories, save the resulting repolist in 'cached_rc'
 555  * and return 0 on success.
 556  */
 557 static int generate_cached_repolist(const char *path, const char *cached_rc)
 558 {
 559         char *locked_rc;
 560         int idx;
 561         FILE *f;
 562
 563         locked_rc = xstrdup(fmt("%s.lock", cached_rc));
 564         f = fopen(locked_rc, "wx");
 565         if (!f) {
 566                 /* Inform about the error unless the lockfile already existed,
 567                  * since that only means we've got concurrent requests.
 568                  */
 569                 if (errno != EEXIST)
 570                         fprintf(stderr, "[cgit] Error opening %s: %s (%d)\n",
 571                                 locked_rc, strerror(errno), errno);
 572                 return errno;
 573         }
 574         idx = cgit_repolist.count;
 575         scan_tree(path, repo_config);
 576         print_repolist(f, &cgit_repolist, idx);
 577         if (rename(locked_rc, cached_rc))
 578                 fprintf(stderr, "[cgit] Error renaming %s to %s: %s (%d)\n",
 579                         locked_rc, cached_rc, strerror(errno), errno);
 580         fclose(f);
 581         return 0;
 582 }
 583
 584 static void process_cached_repolist(const char *path)
 585 {
 586         struct stat st;
 587         char *cached_rc;
 588         time_t age;
 589
 590         cached_rc = xstrdup(fmt("%s/rc-%8x", ctx.cfg.cache_root,
 591                 hash_str(path)));
 592
 593         if (stat(cached_rc, &st)) {
 594                 /* Nothing is cached, we need to scan without forking. And
 595                  * if we fail to generate a cached repolist, we need to
 596                  * invoke scan_tree manually.
 597                  */
 598                 if (generate_cached_repolist(path, cached_rc))
 599                         scan_tree(path, repo_config);
 600                 return;
 601         }
 602
 603         parse_configfile(cached_rc, config_cb);
 604
 605         /* If the cached configfile hasn't expired, lets exit now */
 606         age = time(NULL) - st.st_mtime;
 607         if (age <= (ctx.cfg.cache_scanrc_ttl * 60))
 608                 return;
 609
 610         /* The cached repolist has been parsed, but it was old. So lets
 611          * rescan the specified path and generate a new cached repolist
 612          * in a child-process to avoid latency for the current request.
 613          */
 614         if (fork())
 615                 return;
 616
 617         exit(generate_cached_repolist(path, cached_rc));
 618 }
 619
 620 static void cgit_parse_args(int argc, const char **argv)
 621 {
 622         int i;
 623         int scan = 0;
 624
 625         for (i = 1; i < argc; i++) {
 626                 if (!strncmp(argv[i], "--cache=", 8)) {
 627                         ctx.cfg.cache_root = xstrdup(argv[i]+8);
 628                 }
 629                 if (!strcmp(argv[i], "--nocache")) {
 630                         ctx.cfg.nocache = 1;
 631                 }
 632                 if (!strcmp(argv[i], "--nohttp")) {
 633                         ctx.env.no_http = "1";
 634                 }
 635                 if (!strncmp(argv[i], "--query=", 8)) {
 636                         ctx.qry.raw = xstrdup(argv[i]+8);
 637                 }
 638                 if (!strncmp(argv[i], "--repo=", 7)) {
 639                         ctx.qry.repo = xstrdup(argv[i]+7);
 640                 }
 641                 if (!strncmp(argv[i], "--page=", 7)) {
 642                         ctx.qry.page = xstrdup(argv[i]+7);
 643                 }
 644                 if (!strncmp(argv[i], "--head=", 7)) {
 645                         ctx.qry.head = xstrdup(argv[i]+7);
 646                         ctx.qry.has_symref = 1;
 647                 }
 648                 if (!strncmp(argv[i], "--sha1=", 7)) {
 649                         ctx.qry.sha1 = xstrdup(argv[i]+7);
 650                         ctx.qry.has_sha1 = 1;
 651                 }
 652                 if (!strncmp(argv[i], "--ofs=", 6)) {
 653                         ctx.qry.ofs = atoi(argv[i]+6);
 654                 }
 655                 if (!strncmp(argv[i], "--scan-tree=", 12) ||
 656                     !strncmp(argv[i], "--scan-path=", 12)) {
 657                         /* HACK: the global snapshot bitmask defines the
 658                          * set of allowed snapshot formats, but the config
 659                          * file hasn't been parsed yet so the mask is
 660                          * currently 0. By setting all bits high before
 661                          * scanning we make sure that any in-repo cgitrc
 662                          * snapshot setting is respected by scan_tree().
 663                          * BTW: we assume that there'll never be more than
 664                          * 255 different snapshot formats supported by cgit...
 665                          */
 666                         ctx.cfg.snapshots = 0xFF;
 667                         scan++;
 668                         scan_tree(argv[i] + 12, repo_config);
 669                 }
 670         }
 671         if (scan) {
 672                 qsort(cgit_repolist.repos, cgit_repolist.count,
 673                         sizeof(struct cgit_repo), cmp_repos);
 674                 print_repolist(stdout, &cgit_repolist, 0);
 675                 exit(0);
 676         }
 677 }
 678
 679 static int calc_ttl()
 680 {
 681         if (!ctx.repo)
 682                 return ctx.cfg.cache_root_ttl;
 683
 684         if (!ctx.qry.page)
 685                 return ctx.cfg.cache_repo_ttl;
 686
 687         if (ctx.qry.has_symref)
 688                 return ctx.cfg.cache_dynamic_ttl;
 689
 690         if (ctx.qry.has_sha1)
 691                 return ctx.cfg.cache_static_ttl;
 692
 693         return ctx.cfg.cache_repo_ttl;
 694 }
 695
 696 int main(int argc, const char **argv)
 697 {
 698         const char *path;
 699         char *qry;
 700         int err, ttl;
 701
 702         prepare_context(&ctx);
 703         cgit_repolist.length = 0;
 704         cgit_repolist.count = 0;
 705         cgit_repolist.repos = NULL;
 706
 707         cgit_parse_args(argc, argv);
 708         parse_configfile(ctx.env.cgit_config, config_cb);
 709         ctx.repo = NULL;
 710         http_parse_querystring(ctx.qry.raw, querystring_cb);
 711
 712         /* If virtual-root isn't specified in cgitrc, lets pretend
 713          * that virtual-root equals SCRIPT_NAME.
 714          */
 715         if (!ctx.cfg.virtual_root)
 716                 ctx.cfg.virtual_root = ctx.cfg.script_name;
 717
 718         /* If no url parameter is specified on the querystring, lets
 719          * use PATH_INFO as url. This allows cgit to work with virtual
 720          * urls without the need for rewriterules in the webserver (as
 721          * long as PATH_INFO is included in the cache lookup key).
 722          */
 723         path = ctx.env.path_info;
 724         if (!ctx.qry.url && path) {
 725                 if (path[0] == '/')
 726                         path++;
 727                 ctx.qry.url = xstrdup(path);
 728                 if (ctx.qry.raw) {
 729                         qry = ctx.qry.raw;
 730                         ctx.qry.raw = xstrdup(fmt("%s?%s", path, qry));
 731                         free(qry);
 732                 } else
 733                         ctx.qry.raw = xstrdup(ctx.qry.url);
 734                 cgit_parse_url(ctx.qry.url);
 735         }
 736
 737         ttl = calc_ttl();
 738         ctx.page.expires += ttl*60;
 739         if (ctx.env.request_method && !strcmp(ctx.env.request_method, "HEAD"))
 740                 ctx.cfg.nocache = 1;
 741         if (ctx.cfg.nocache)
 742                 ctx.cfg.cache_size = 0;
 743         err = cache_process(ctx.cfg.cache_size, ctx.cfg.cache_root,
 744                             ctx.qry.raw, ttl, process_request, &ctx);
 745         if (err)
 746                 cgit_print_error(fmt("Error processing page: %s (%d)",
 747                                      strerror(err), err));
 748         return err;
 749 }