all repos — cgit @ 9786f4613da38cb263e76263370d7816a9347149

a hyperfast web frontend for git written in c

cgit.c (view raw)

   1/* cgit.c: cgi for the git scm
   2 *
   3 * Copyright (C) 2006-2014 cgit Development Team <cgit@lists.zx2c4.com>
   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 "ui-blob.h"
  17#include "ui-summary.h"
  18#include "scan-tree.h"
  19
  20const char *cgit_version = CGIT_VERSION;
  21
  22static void add_mimetype(const char *name, const char *value)
  23{
  24	struct string_list_item *item;
  25
  26	item = string_list_insert(&ctx.cfg.mimetypes, xstrdup(name));
  27	item->util = xstrdup(value);
  28}
  29
  30static void process_cached_repolist(const char *path);
  31
  32static void repo_config(struct cgit_repo *repo, const char *name, const char *value)
  33{
  34	struct string_list_item *item;
  35
  36	if (!strcmp(name, "name"))
  37		repo->name = xstrdup(value);
  38	else if (!strcmp(name, "clone-url"))
  39		repo->clone_url = xstrdup(value);
  40	else if (!strcmp(name, "desc"))
  41		repo->desc = xstrdup(value);
  42	else if (!strcmp(name, "owner"))
  43		repo->owner = xstrdup(value);
  44	else if (!strcmp(name, "defbranch"))
  45		repo->defbranch = xstrdup(value);
  46	else if (!strcmp(name, "snapshots"))
  47		repo->snapshots = ctx.cfg.snapshots & cgit_parse_snapshots_mask(value);
  48	else if (!strcmp(name, "enable-commit-graph"))
  49		repo->enable_commit_graph = atoi(value);
  50	else if (!strcmp(name, "enable-log-filecount"))
  51		repo->enable_log_filecount = atoi(value);
  52	else if (!strcmp(name, "enable-log-linecount"))
  53		repo->enable_log_linecount = atoi(value);
  54	else if (!strcmp(name, "enable-remote-branches"))
  55		repo->enable_remote_branches = atoi(value);
  56	else if (!strcmp(name, "enable-subject-links"))
  57		repo->enable_subject_links = atoi(value);
  58	else if (!strcmp(name, "branch-sort")) {
  59		if (!strcmp(value, "age"))
  60			repo->branch_sort = 1;
  61		if (!strcmp(value, "name"))
  62			repo->branch_sort = 0;
  63	} else if (!strcmp(name, "commit-sort")) {
  64		if (!strcmp(value, "date"))
  65			repo->commit_sort = 1;
  66		if (!strcmp(value, "topo"))
  67			repo->commit_sort = 2;
  68	} else if (!strcmp(name, "max-stats"))
  69		repo->max_stats = cgit_find_stats_period(value, NULL);
  70	else if (!strcmp(name, "module-link"))
  71		repo->module_link= xstrdup(value);
  72	else if (!prefixcmp(name, "module-link.")) {
  73		item = string_list_append(&repo->submodules, xstrdup(name + 12));
  74		item->util = xstrdup(value);
  75	} else if (!strcmp(name, "section"))
  76		repo->section = xstrdup(value);
  77	else if (!strcmp(name, "readme") && value != NULL) {
  78		if (repo->readme.items == ctx.cfg.readme.items)
  79			memset(&repo->readme, 0, sizeof(repo->readme));
  80		string_list_append(&repo->readme, xstrdup(value));
  81	} else if (!strcmp(name, "logo") && value != NULL)
  82		repo->logo = xstrdup(value);
  83	else if (!strcmp(name, "logo-link") && value != NULL)
  84		repo->logo_link = xstrdup(value);
  85	else if (ctx.cfg.enable_filter_overrides) {
  86		if (!strcmp(name, "about-filter"))
  87			repo->about_filter = cgit_new_filter(value, ABOUT);
  88		else if (!strcmp(name, "commit-filter"))
  89			repo->commit_filter = cgit_new_filter(value, COMMIT);
  90		else if (!strcmp(name, "source-filter"))
  91			repo->source_filter = cgit_new_filter(value, SOURCE);
  92		else if (!strcmp(name, "email-filter"))
  93			repo->email_filter = cgit_new_filter(value, EMAIL);
  94	}
  95}
  96
  97static void config_cb(const char *name, const char *value)
  98{
  99	if (!strcmp(name, "section") || !strcmp(name, "repo.group"))
 100		ctx.cfg.section = xstrdup(value);
 101	else if (!strcmp(name, "repo.url"))
 102		ctx.repo = cgit_add_repo(value);
 103	else if (ctx.repo && !strcmp(name, "repo.path"))
 104		ctx.repo->path = trim_end(value, '/');
 105	else if (ctx.repo && !prefixcmp(name, "repo."))
 106		repo_config(ctx.repo, name + 5, value);
 107	else if (!strcmp(name, "readme") && value != NULL)
 108		string_list_append(&ctx.cfg.readme, xstrdup(value));
 109	else if (!strcmp(name, "root-title"))
 110		ctx.cfg.root_title = xstrdup(value);
 111	else if (!strcmp(name, "root-desc"))
 112		ctx.cfg.root_desc = xstrdup(value);
 113	else if (!strcmp(name, "root-readme"))
 114		ctx.cfg.root_readme = xstrdup(value);
 115	else if (!strcmp(name, "css"))
 116		ctx.cfg.css = xstrdup(value);
 117	else if (!strcmp(name, "favicon"))
 118		ctx.cfg.favicon = xstrdup(value);
 119	else if (!strcmp(name, "footer"))
 120		ctx.cfg.footer = xstrdup(value);
 121	else if (!strcmp(name, "head-include"))
 122		ctx.cfg.head_include = xstrdup(value);
 123	else if (!strcmp(name, "header"))
 124		ctx.cfg.header = xstrdup(value);
 125	else if (!strcmp(name, "logo"))
 126		ctx.cfg.logo = xstrdup(value);
 127	else if (!strcmp(name, "index-header"))
 128		ctx.cfg.index_header = xstrdup(value);
 129	else if (!strcmp(name, "index-info"))
 130		ctx.cfg.index_info = xstrdup(value);
 131	else if (!strcmp(name, "logo-link"))
 132		ctx.cfg.logo_link = xstrdup(value);
 133	else if (!strcmp(name, "module-link"))
 134		ctx.cfg.module_link = xstrdup(value);
 135	else if (!strcmp(name, "strict-export"))
 136		ctx.cfg.strict_export = xstrdup(value);
 137	else if (!strcmp(name, "virtual-root")) {
 138		ctx.cfg.virtual_root = ensure_end(value, '/');
 139	} else if (!strcmp(name, "nocache"))
 140		ctx.cfg.nocache = atoi(value);
 141	else if (!strcmp(name, "noplainemail"))
 142		ctx.cfg.noplainemail = atoi(value);
 143	else if (!strcmp(name, "noheader"))
 144		ctx.cfg.noheader = atoi(value);
 145	else if (!strcmp(name, "snapshots"))
 146		ctx.cfg.snapshots = cgit_parse_snapshots_mask(value);
 147	else if (!strcmp(name, "enable-filter-overrides"))
 148		ctx.cfg.enable_filter_overrides = atoi(value);
 149	else if (!strcmp(name, "enable-http-clone"))
 150		ctx.cfg.enable_http_clone = atoi(value);
 151	else if (!strcmp(name, "enable-index-links"))
 152		ctx.cfg.enable_index_links = atoi(value);
 153	else if (!strcmp(name, "enable-index-owner"))
 154		ctx.cfg.enable_index_owner = atoi(value);
 155	else if (!strcmp(name, "enable-commit-graph"))
 156		ctx.cfg.enable_commit_graph = atoi(value);
 157	else if (!strcmp(name, "enable-log-filecount"))
 158		ctx.cfg.enable_log_filecount = atoi(value);
 159	else if (!strcmp(name, "enable-log-linecount"))
 160		ctx.cfg.enable_log_linecount = atoi(value);
 161	else if (!strcmp(name, "enable-remote-branches"))
 162		ctx.cfg.enable_remote_branches = atoi(value);
 163	else if (!strcmp(name, "enable-subject-links"))
 164		ctx.cfg.enable_subject_links = atoi(value);
 165	else if (!strcmp(name, "enable-tree-linenumbers"))
 166		ctx.cfg.enable_tree_linenumbers = atoi(value);
 167	else if (!strcmp(name, "enable-git-config"))
 168		ctx.cfg.enable_git_config = atoi(value);
 169	else if (!strcmp(name, "max-stats"))
 170		ctx.cfg.max_stats = cgit_find_stats_period(value, NULL);
 171	else if (!strcmp(name, "cache-size"))
 172		ctx.cfg.cache_size = atoi(value);
 173	else if (!strcmp(name, "cache-root"))
 174		ctx.cfg.cache_root = xstrdup(expand_macros(value));
 175	else if (!strcmp(name, "cache-root-ttl"))
 176		ctx.cfg.cache_root_ttl = atoi(value);
 177	else if (!strcmp(name, "cache-repo-ttl"))
 178		ctx.cfg.cache_repo_ttl = atoi(value);
 179	else if (!strcmp(name, "cache-scanrc-ttl"))
 180		ctx.cfg.cache_scanrc_ttl = atoi(value);
 181	else if (!strcmp(name, "cache-static-ttl"))
 182		ctx.cfg.cache_static_ttl = atoi(value);
 183	else if (!strcmp(name, "cache-dynamic-ttl"))
 184		ctx.cfg.cache_dynamic_ttl = atoi(value);
 185	else if (!strcmp(name, "cache-about-ttl"))
 186		ctx.cfg.cache_about_ttl = atoi(value);
 187	else if (!strcmp(name, "case-sensitive-sort"))
 188		ctx.cfg.case_sensitive_sort = atoi(value);
 189	else if (!strcmp(name, "about-filter"))
 190		ctx.cfg.about_filter = cgit_new_filter(value, ABOUT);
 191	else if (!strcmp(name, "commit-filter"))
 192		ctx.cfg.commit_filter = cgit_new_filter(value, COMMIT);
 193	else if (!strcmp(name, "email-filter"))
 194		ctx.cfg.email_filter = cgit_new_filter(value, EMAIL);
 195	else if (!strcmp(name, "auth-filter"))
 196		ctx.cfg.auth_filter = cgit_new_filter(value, AUTH);
 197	else if (!strcmp(name, "embedded"))
 198		ctx.cfg.embedded = atoi(value);
 199	else if (!strcmp(name, "max-atom-items"))
 200		ctx.cfg.max_atom_items = atoi(value);
 201	else if (!strcmp(name, "max-message-length"))
 202		ctx.cfg.max_msg_len = atoi(value);
 203	else if (!strcmp(name, "max-repodesc-length"))
 204		ctx.cfg.max_repodesc_len = atoi(value);
 205	else if (!strcmp(name, "max-blob-size"))
 206		ctx.cfg.max_blob_size = atoi(value);
 207	else if (!strcmp(name, "max-repo-count"))
 208		ctx.cfg.max_repo_count = atoi(value);
 209	else if (!strcmp(name, "max-commit-count"))
 210		ctx.cfg.max_commit_count = atoi(value);
 211	else if (!strcmp(name, "project-list"))
 212		ctx.cfg.project_list = xstrdup(expand_macros(value));
 213	else if (!strcmp(name, "scan-path"))
 214		if (!ctx.cfg.nocache && ctx.cfg.cache_size)
 215			process_cached_repolist(expand_macros(value));
 216		else if (ctx.cfg.project_list)
 217			scan_projects(expand_macros(value),
 218				      ctx.cfg.project_list, repo_config);
 219		else
 220			scan_tree(expand_macros(value), repo_config);
 221	else if (!strcmp(name, "scan-hidden-path"))
 222		ctx.cfg.scan_hidden_path = atoi(value);
 223	else if (!strcmp(name, "section-from-path"))
 224		ctx.cfg.section_from_path = atoi(value);
 225	else if (!strcmp(name, "repository-sort"))
 226		ctx.cfg.repository_sort = xstrdup(value);
 227	else if (!strcmp(name, "section-sort"))
 228		ctx.cfg.section_sort = atoi(value);
 229	else if (!strcmp(name, "source-filter"))
 230		ctx.cfg.source_filter = cgit_new_filter(value, SOURCE);
 231	else if (!strcmp(name, "summary-log"))
 232		ctx.cfg.summary_log = atoi(value);
 233	else if (!strcmp(name, "summary-branches"))
 234		ctx.cfg.summary_branches = atoi(value);
 235	else if (!strcmp(name, "summary-tags"))
 236		ctx.cfg.summary_tags = atoi(value);
 237	else if (!strcmp(name, "side-by-side-diffs"))
 238		ctx.cfg.ssdiff = atoi(value);
 239	else if (!strcmp(name, "agefile"))
 240		ctx.cfg.agefile = xstrdup(value);
 241	else if (!strcmp(name, "mimetype-file"))
 242		ctx.cfg.mimetype_file = xstrdup(value);
 243	else if (!strcmp(name, "renamelimit"))
 244		ctx.cfg.renamelimit = atoi(value);
 245	else if (!strcmp(name, "remove-suffix"))
 246		ctx.cfg.remove_suffix = atoi(value);
 247	else if (!strcmp(name, "robots"))
 248		ctx.cfg.robots = xstrdup(value);
 249	else if (!strcmp(name, "clone-prefix"))
 250		ctx.cfg.clone_prefix = xstrdup(value);
 251	else if (!strcmp(name, "clone-url"))
 252		ctx.cfg.clone_url = xstrdup(value);
 253	else if (!strcmp(name, "local-time"))
 254		ctx.cfg.local_time = atoi(value);
 255	else if (!strcmp(name, "commit-sort")) {
 256		if (!strcmp(value, "date"))
 257			ctx.cfg.commit_sort = 1;
 258		if (!strcmp(value, "topo"))
 259			ctx.cfg.commit_sort = 2;
 260	} else if (!strcmp(name, "branch-sort")) {
 261		if (!strcmp(value, "age"))
 262			ctx.cfg.branch_sort = 1;
 263		if (!strcmp(value, "name"))
 264			ctx.cfg.branch_sort = 0;
 265	} else if (!prefixcmp(name, "mimetype."))
 266		add_mimetype(name + 9, value);
 267	else if (!strcmp(name, "include"))
 268		parse_configfile(expand_macros(value), config_cb);
 269}
 270
 271static void querystring_cb(const char *name, const char *value)
 272{
 273	if (!value)
 274		value = "";
 275
 276	if (!strcmp(name,"r")) {
 277		ctx.qry.repo = xstrdup(value);
 278		ctx.repo = cgit_get_repoinfo(value);
 279	} else if (!strcmp(name, "p")) {
 280		ctx.qry.page = xstrdup(value);
 281	} else if (!strcmp(name, "url")) {
 282		if (*value == '/')
 283			value++;
 284		ctx.qry.url = xstrdup(value);
 285		cgit_parse_url(value);
 286	} else if (!strcmp(name, "qt")) {
 287		ctx.qry.grep = xstrdup(value);
 288	} else if (!strcmp(name, "q")) {
 289		ctx.qry.search = xstrdup(value);
 290	} else if (!strcmp(name, "h")) {
 291		ctx.qry.head = xstrdup(value);
 292		ctx.qry.has_symref = 1;
 293	} else if (!strcmp(name, "id")) {
 294		ctx.qry.sha1 = xstrdup(value);
 295		ctx.qry.has_sha1 = 1;
 296	} else if (!strcmp(name, "id2")) {
 297		ctx.qry.sha2 = xstrdup(value);
 298		ctx.qry.has_sha1 = 1;
 299	} else if (!strcmp(name, "ofs")) {
 300		ctx.qry.ofs = atoi(value);
 301	} else if (!strcmp(name, "path")) {
 302		ctx.qry.path = trim_end(value, '/');
 303	} else if (!strcmp(name, "name")) {
 304		ctx.qry.name = xstrdup(value);
 305	} else if (!strcmp(name, "mimetype")) {
 306		ctx.qry.mimetype = xstrdup(value);
 307	} else if (!strcmp(name, "s")) {
 308		ctx.qry.sort = xstrdup(value);
 309	} else if (!strcmp(name, "showmsg")) {
 310		ctx.qry.showmsg = atoi(value);
 311	} else if (!strcmp(name, "period")) {
 312		ctx.qry.period = xstrdup(value);
 313	} else if (!strcmp(name, "ss")) {
 314		ctx.qry.ssdiff = atoi(value);
 315		ctx.qry.has_ssdiff = 1;
 316	} else if (!strcmp(name, "all")) {
 317		ctx.qry.show_all = atoi(value);
 318	} else if (!strcmp(name, "context")) {
 319		ctx.qry.context = atoi(value);
 320	} else if (!strcmp(name, "ignorews")) {
 321		ctx.qry.ignorews = atoi(value);
 322	}
 323}
 324
 325static void prepare_context(void)
 326{
 327	memset(&ctx, 0, sizeof(ctx));
 328	ctx.cfg.agefile = "info/web/last-modified";
 329	ctx.cfg.nocache = 0;
 330	ctx.cfg.cache_size = 0;
 331	ctx.cfg.cache_max_create_time = 5;
 332	ctx.cfg.cache_root = CGIT_CACHE_ROOT;
 333	ctx.cfg.cache_about_ttl = 15;
 334	ctx.cfg.cache_repo_ttl = 5;
 335	ctx.cfg.cache_root_ttl = 5;
 336	ctx.cfg.cache_scanrc_ttl = 15;
 337	ctx.cfg.cache_dynamic_ttl = 5;
 338	ctx.cfg.cache_static_ttl = -1;
 339	ctx.cfg.case_sensitive_sort = 1;
 340	ctx.cfg.branch_sort = 0;
 341	ctx.cfg.commit_sort = 0;
 342	ctx.cfg.css = "/cgit.css";
 343	ctx.cfg.logo = "/cgit.png";
 344	ctx.cfg.favicon = "/favicon.ico";
 345	ctx.cfg.local_time = 0;
 346	ctx.cfg.enable_http_clone = 1;
 347	ctx.cfg.enable_index_owner = 1;
 348	ctx.cfg.enable_tree_linenumbers = 1;
 349	ctx.cfg.enable_git_config = 0;
 350	ctx.cfg.max_repo_count = 50;
 351	ctx.cfg.max_commit_count = 50;
 352	ctx.cfg.max_lock_attempts = 5;
 353	ctx.cfg.max_msg_len = 80;
 354	ctx.cfg.max_repodesc_len = 80;
 355	ctx.cfg.max_blob_size = 0;
 356	ctx.cfg.max_stats = 0;
 357	ctx.cfg.project_list = NULL;
 358	ctx.cfg.renamelimit = -1;
 359	ctx.cfg.remove_suffix = 0;
 360	ctx.cfg.robots = "index, nofollow";
 361	ctx.cfg.root_title = "Git repository browser";
 362	ctx.cfg.root_desc = "a fast webinterface for the git dscm";
 363	ctx.cfg.scan_hidden_path = 0;
 364	ctx.cfg.script_name = CGIT_SCRIPT_NAME;
 365	ctx.cfg.section = "";
 366	ctx.cfg.repository_sort = "name";
 367	ctx.cfg.section_sort = 1;
 368	ctx.cfg.summary_branches = 10;
 369	ctx.cfg.summary_log = 10;
 370	ctx.cfg.summary_tags = 10;
 371	ctx.cfg.max_atom_items = 10;
 372	ctx.cfg.ssdiff = 0;
 373	ctx.env.cgit_config = getenv("CGIT_CONFIG");
 374	ctx.env.http_host = getenv("HTTP_HOST");
 375	ctx.env.https = getenv("HTTPS");
 376	ctx.env.no_http = getenv("NO_HTTP");
 377	ctx.env.path_info = getenv("PATH_INFO");
 378	ctx.env.query_string = getenv("QUERY_STRING");
 379	ctx.env.request_method = getenv("REQUEST_METHOD");
 380	ctx.env.script_name = getenv("SCRIPT_NAME");
 381	ctx.env.server_name = getenv("SERVER_NAME");
 382	ctx.env.server_port = getenv("SERVER_PORT");
 383	ctx.env.http_cookie = getenv("HTTP_COOKIE");
 384	ctx.env.http_referer = getenv("HTTP_REFERER");
 385	ctx.env.content_length = getenv("CONTENT_LENGTH") ? strtoul(getenv("CONTENT_LENGTH"), NULL, 10) : 0;
 386	ctx.env.authenticated = 0;
 387	ctx.page.mimetype = "text/html";
 388	ctx.page.charset = PAGE_ENCODING;
 389	ctx.page.filename = NULL;
 390	ctx.page.size = 0;
 391	ctx.page.modified = time(NULL);
 392	ctx.page.expires = ctx.page.modified;
 393	ctx.page.etag = NULL;
 394	memset(&ctx.cfg.mimetypes, 0, sizeof(struct string_list));
 395	if (ctx.env.script_name)
 396		ctx.cfg.script_name = xstrdup(ctx.env.script_name);
 397	if (ctx.env.query_string)
 398		ctx.qry.raw = xstrdup(ctx.env.query_string);
 399	if (!ctx.env.cgit_config)
 400		ctx.env.cgit_config = CGIT_CONFIG;
 401}
 402
 403struct refmatch {
 404	char *req_ref;
 405	char *first_ref;
 406	int match;
 407};
 408
 409static int find_current_ref(const char *refname, const unsigned char *sha1,
 410			    int flags, void *cb_data)
 411{
 412	struct refmatch *info;
 413
 414	info = (struct refmatch *)cb_data;
 415	if (!strcmp(refname, info->req_ref))
 416		info->match = 1;
 417	if (!info->first_ref)
 418		info->first_ref = xstrdup(refname);
 419	return info->match;
 420}
 421
 422static void free_refmatch_inner(struct refmatch *info)
 423{
 424	if (info->first_ref)
 425		free(info->first_ref);
 426}
 427
 428static char *find_default_branch(struct cgit_repo *repo)
 429{
 430	struct refmatch info;
 431	char *ref;
 432
 433	info.req_ref = repo->defbranch;
 434	info.first_ref = NULL;
 435	info.match = 0;
 436	for_each_branch_ref(find_current_ref, &info);
 437	if (info.match)
 438		ref = info.req_ref;
 439	else
 440		ref = info.first_ref;
 441	if (ref)
 442		ref = xstrdup(ref);
 443	free_refmatch_inner(&info);
 444
 445	return ref;
 446}
 447
 448static char *guess_defbranch(void)
 449{
 450	const char *ref;
 451	unsigned char sha1[20];
 452
 453	ref = resolve_ref_unsafe("HEAD", sha1, 0, NULL);
 454	if (!ref || prefixcmp(ref, "refs/heads/"))
 455		return "master";
 456	return xstrdup(ref + 11);
 457}
 458/* The caller must free filename and ref after calling this. */
 459static inline void parse_readme(const char *readme, char **filename, char **ref, struct cgit_repo *repo)
 460{
 461	const char *colon;
 462
 463	*filename = NULL;
 464	*ref = NULL;
 465
 466	if (!readme || !readme[0])
 467		return;
 468
 469	/* Check if the readme is tracked in the git repo. */
 470	colon = strchr(readme, ':');
 471	if (colon && strlen(colon) > 1) {
 472		/* If it starts with a colon, we want to use
 473		 * the default branch */
 474		if (colon == readme && repo->defbranch)
 475			*ref = xstrdup(repo->defbranch);
 476		else
 477			*ref = xstrndup(readme, colon - readme);
 478		readme = colon + 1;
 479	}
 480
 481	/* Prepend repo path to relative readme path unless tracked. */
 482	if (!(*ref) && readme[0] != '/')
 483		*filename = fmtalloc("%s/%s", repo->path, readme);
 484	else
 485		*filename = xstrdup(readme);
 486}
 487static void choose_readme(struct cgit_repo *repo)
 488{
 489	int found;
 490	char *filename, *ref;
 491	struct string_list_item *entry;
 492
 493	if (!repo->readme.nr)
 494		return;
 495
 496	found = 0;
 497	for_each_string_list_item(entry, &repo->readme) {
 498		parse_readme(entry->string, &filename, &ref, repo);
 499		if (!filename) {
 500			free(filename);
 501			free(ref);
 502			continue;
 503		}
 504		/* If there's only one item, we skip the possibly expensive
 505		 * selection process. */
 506		if (repo->readme.nr == 1) {
 507			found = 1;
 508			break;
 509		}
 510		if (ref) {
 511			if (cgit_ref_path_exists(filename, ref, 1)) {
 512				found = 1;
 513				break;
 514			}
 515		}
 516		else if (!access(filename, R_OK)) {
 517			found = 1;
 518			break;
 519		}
 520		free(filename);
 521		free(ref);
 522	}
 523	repo->readme.strdup_strings = 1;
 524	string_list_clear(&repo->readme, 0);
 525	repo->readme.strdup_strings = 0;
 526	if (found)
 527		string_list_append(&repo->readme, filename)->util = ref;
 528}
 529
 530static int prepare_repo_cmd(void)
 531{
 532	unsigned char sha1[20];
 533	int nongit = 0;
 534	int rc;
 535
 536	/* The path to the git repository. */
 537	setenv("GIT_DIR", ctx.repo->path, 1);
 538
 539	/* Do not look in /etc/ for gitconfig and gitattributes. */
 540	setenv("GIT_CONFIG_NOSYSTEM", "1", 1);
 541	setenv("GIT_ATTR_NOSYSTEM", "1", 1);
 542	unsetenv("HOME");
 543	unsetenv("XDG_CONFIG_HOME");
 544
 545	/* Setup the git directory and initialize the notes system. Both of these
 546	 * load local configuration from the git repository, so we do them both while
 547	 * the HOME variables are unset. */
 548	setup_git_directory_gently(&nongit);
 549	init_display_notes(NULL);
 550
 551	if (nongit) {
 552		const char *name = ctx.repo->name;
 553		rc = errno;
 554		ctx.page.title = fmtalloc("%s - %s", ctx.cfg.root_title,
 555						"config error");
 556		ctx.repo = NULL;
 557		cgit_print_http_headers();
 558		cgit_print_docstart();
 559		cgit_print_pageheader();
 560		cgit_print_error("Failed to open %s: %s", name,
 561				 rc ? strerror(rc) : "Not a valid git repository");
 562		cgit_print_docend();
 563		return 1;
 564	}
 565	ctx.page.title = fmtalloc("%s - %s", ctx.repo->name, ctx.repo->desc);
 566
 567	if (!ctx.repo->defbranch)
 568		ctx.repo->defbranch = guess_defbranch();
 569
 570	if (!ctx.qry.head) {
 571		ctx.qry.nohead = 1;
 572		ctx.qry.head = find_default_branch(ctx.repo);
 573	}
 574
 575	if (!ctx.qry.head) {
 576		cgit_print_http_headers();
 577		cgit_print_docstart();
 578		cgit_print_pageheader();
 579		cgit_print_error("Repository seems to be empty");
 580		cgit_print_docend();
 581		return 1;
 582	}
 583
 584	if (get_sha1(ctx.qry.head, sha1)) {
 585		char *tmp = xstrdup(ctx.qry.head);
 586		ctx.qry.head = ctx.repo->defbranch;
 587		ctx.page.status = 404;
 588		ctx.page.statusmsg = "Not found";
 589		cgit_print_http_headers();
 590		cgit_print_docstart();
 591		cgit_print_pageheader();
 592		cgit_print_error("Invalid branch: %s", tmp);
 593		cgit_print_docend();
 594		free(tmp);
 595		return 1;
 596	}
 597	sort_string_list(&ctx.repo->submodules);
 598	cgit_prepare_repo_env(ctx.repo);
 599	choose_readme(ctx.repo);
 600	return 0;
 601}
 602
 603static inline void open_auth_filter(const char *function)
 604{
 605	cgit_open_filter(ctx.cfg.auth_filter, function,
 606		ctx.env.http_cookie ? ctx.env.http_cookie : "",
 607		ctx.env.request_method ? ctx.env.request_method : "",
 608		ctx.env.query_string ? ctx.env.query_string : "",
 609		ctx.env.http_referer ? ctx.env.http_referer : "",
 610		ctx.env.path_info ? ctx.env.path_info : "",
 611		ctx.env.http_host ? ctx.env.http_host : "",
 612		ctx.env.https ? ctx.env.https : "",
 613		ctx.qry.repo ? ctx.qry.repo : "",
 614		ctx.qry.page ? ctx.qry.page : "",
 615		ctx.qry.url ? ctx.qry.url : "",
 616		cgit_loginurl());
 617}
 618
 619/* We intentionally keep this rather small, instead of looping and
 620 * feeding it to the filter a couple bytes at a time. This way, the
 621 * filter itself does not need to handle any denial of service or
 622 * buffer bloat issues. If this winds up being too small, people
 623 * will complain on the mailing list, and we'll increase it as needed. */
 624#define MAX_AUTHENTICATION_POST_BYTES 4096
 625/* The filter is expected to spit out "Status: " and all headers. */
 626static inline void authenticate_post(void)
 627{
 628	char buffer[MAX_AUTHENTICATION_POST_BYTES];
 629	int len;
 630
 631	open_auth_filter("authenticate-post");
 632	len = ctx.env.content_length;
 633	if (len > MAX_AUTHENTICATION_POST_BYTES)
 634		len = MAX_AUTHENTICATION_POST_BYTES;
 635	if (read(STDIN_FILENO, buffer, len) < 0)
 636		die_errno("Could not read POST from stdin");
 637	if (write(STDOUT_FILENO, buffer, len) < 0)
 638		die_errno("Could not write POST to stdout");
 639	cgit_close_filter(ctx.cfg.auth_filter);
 640	exit(0);
 641}
 642
 643static inline void authenticate_cookie(void)
 644{
 645	/* If we don't have an auth_filter, consider all cookies valid, and thus return early. */
 646	if (!ctx.cfg.auth_filter) {
 647		ctx.env.authenticated = 1;
 648		return;
 649	}
 650
 651	/* If we're having something POST'd to /login, we're authenticating POST,
 652	 * instead of the cookie, so call authenticate_post and bail out early.
 653	 * This pattern here should match /?p=login with POST. */
 654	if (ctx.env.request_method && ctx.qry.page && !ctx.repo && \
 655	    !strcmp(ctx.env.request_method, "POST") && !strcmp(ctx.qry.page, "login")) {
 656		authenticate_post();
 657		return;
 658	}
 659
 660	/* If we've made it this far, we're authenticating the cookie for real, so do that. */
 661	open_auth_filter("authenticate-cookie");
 662	ctx.env.authenticated = cgit_close_filter(ctx.cfg.auth_filter);
 663}
 664
 665static void process_request(void)
 666{
 667	struct cgit_cmd *cmd;
 668
 669	/* If we're not yet authenticated, no matter what page we're on,
 670	 * display the authentication body from the auth_filter. This should
 671	 * never be cached. */
 672	if (!ctx.env.authenticated) {
 673		ctx.page.title = "Authentication Required";
 674		cgit_print_http_headers();
 675		cgit_print_docstart();
 676		cgit_print_pageheader();
 677		open_auth_filter("body");
 678		cgit_close_filter(ctx.cfg.auth_filter);
 679		cgit_print_docend();
 680		return;
 681	}
 682
 683	cmd = cgit_get_cmd();
 684	if (!cmd) {
 685		ctx.page.title = "cgit error";
 686		ctx.page.status = 404;
 687		ctx.page.statusmsg = "Not found";
 688		cgit_print_http_headers();
 689		cgit_print_docstart();
 690		cgit_print_pageheader();
 691		cgit_print_error("Invalid request");
 692		cgit_print_docend();
 693		return;
 694	}
 695
 696	if (!ctx.cfg.enable_http_clone && cmd->is_clone) {
 697		html_status(404, "Not found", 0);
 698		return;
 699	}
 700
 701	/* If cmd->want_vpath is set, assume ctx.qry.path contains a "virtual"
 702	 * in-project path limit to be made available at ctx.qry.vpath.
 703	 * Otherwise, no path limit is in effect (ctx.qry.vpath = NULL).
 704	 */
 705	ctx.qry.vpath = cmd->want_vpath ? ctx.qry.path : NULL;
 706
 707	if (cmd->want_repo && !ctx.repo) {
 708		cgit_print_http_headers();
 709		cgit_print_docstart();
 710		cgit_print_pageheader();
 711		cgit_print_error("No repository selected");
 712		cgit_print_docend();
 713		return;
 714	}
 715
 716	if (ctx.repo && prepare_repo_cmd())
 717		return;
 718
 719	if (cmd->want_layout) {
 720		cgit_print_http_headers();
 721		cgit_print_docstart();
 722		cgit_print_pageheader();
 723	}
 724
 725	cmd->fn();
 726
 727	if (cmd->want_layout)
 728		cgit_print_docend();
 729}
 730
 731static int cmp_repos(const void *a, const void *b)
 732{
 733	const struct cgit_repo *ra = a, *rb = b;
 734	return strcmp(ra->url, rb->url);
 735}
 736
 737static char *build_snapshot_setting(int bitmap)
 738{
 739	const struct cgit_snapshot_format *f;
 740	struct strbuf result = STRBUF_INIT;
 741
 742	for (f = cgit_snapshot_formats; f->suffix; f++) {
 743		if (f->bit & bitmap) {
 744			if (result.len)
 745				strbuf_addch(&result, ' ');
 746			strbuf_addstr(&result, f->suffix);
 747		}
 748	}
 749	return strbuf_detach(&result, NULL);
 750}
 751
 752static char *get_first_line(char *txt)
 753{
 754	char *t = xstrdup(txt);
 755	char *p = strchr(t, '\n');
 756	if (p)
 757		*p = '\0';
 758	return t;
 759}
 760
 761static void print_repo(FILE *f, struct cgit_repo *repo)
 762{
 763	struct string_list_item *item;
 764	fprintf(f, "repo.url=%s\n", repo->url);
 765	fprintf(f, "repo.name=%s\n", repo->name);
 766	fprintf(f, "repo.path=%s\n", repo->path);
 767	if (repo->owner)
 768		fprintf(f, "repo.owner=%s\n", repo->owner);
 769	if (repo->desc) {
 770		char *tmp = get_first_line(repo->desc);
 771		fprintf(f, "repo.desc=%s\n", tmp);
 772		free(tmp);
 773	}
 774	for_each_string_list_item(item, &repo->readme) {
 775		if (item->util)
 776			fprintf(f, "repo.readme=%s:%s\n", (char *)item->util, item->string);
 777		else
 778			fprintf(f, "repo.readme=%s\n", item->string);
 779	}
 780	if (repo->defbranch)
 781		fprintf(f, "repo.defbranch=%s\n", repo->defbranch);
 782	if (repo->module_link)
 783		fprintf(f, "repo.module-link=%s\n", repo->module_link);
 784	if (repo->section)
 785		fprintf(f, "repo.section=%s\n", repo->section);
 786	if (repo->clone_url)
 787		fprintf(f, "repo.clone-url=%s\n", repo->clone_url);
 788	fprintf(f, "repo.enable-commit-graph=%d\n",
 789	        repo->enable_commit_graph);
 790	fprintf(f, "repo.enable-log-filecount=%d\n",
 791	        repo->enable_log_filecount);
 792	fprintf(f, "repo.enable-log-linecount=%d\n",
 793	        repo->enable_log_linecount);
 794	if (repo->about_filter && repo->about_filter != ctx.cfg.about_filter)
 795		cgit_fprintf_filter(repo->about_filter, f, "repo.about-filter=");
 796	if (repo->commit_filter && repo->commit_filter != ctx.cfg.commit_filter)
 797		cgit_fprintf_filter(repo->commit_filter, f, "repo.commit-filter=");
 798	if (repo->source_filter && repo->source_filter != ctx.cfg.source_filter)
 799		cgit_fprintf_filter(repo->source_filter, f, "repo.source-filter=");
 800	if (repo->email_filter && repo->email_filter != ctx.cfg.email_filter)
 801		cgit_fprintf_filter(repo->email_filter, f, "repo.email-filter=");
 802	if (repo->snapshots != ctx.cfg.snapshots) {
 803		char *tmp = build_snapshot_setting(repo->snapshots);
 804		fprintf(f, "repo.snapshots=%s\n", tmp ? tmp : "");
 805		free(tmp);
 806	}
 807	if (repo->max_stats != ctx.cfg.max_stats)
 808		fprintf(f, "repo.max-stats=%s\n",
 809		        cgit_find_stats_periodname(repo->max_stats));
 810	if (repo->logo)
 811		fprintf(f, "repo.logo=%s\n", repo->logo);
 812	if (repo->logo_link)
 813		fprintf(f, "repo.logo-link=%s\n", repo->logo_link);
 814	fprintf(f, "repo.enable-remote-branches=%d\n", repo->enable_remote_branches);
 815	fprintf(f, "repo.enable-subject-links=%d\n", repo->enable_subject_links);
 816	if (repo->branch_sort == 1)
 817		fprintf(f, "repo.branch-sort=age\n");
 818	if (repo->commit_sort) {
 819		if (repo->commit_sort == 1)
 820			fprintf(f, "repo.commit-sort=date\n");
 821		else if (repo->commit_sort == 2)
 822			fprintf(f, "repo.commit-sort=topo\n");
 823	}
 824	fprintf(f, "\n");
 825}
 826
 827static void print_repolist(FILE *f, struct cgit_repolist *list, int start)
 828{
 829	int i;
 830
 831	for (i = start; i < list->count; i++)
 832		print_repo(f, &list->repos[i]);
 833}
 834
 835/* Scan 'path' for git repositories, save the resulting repolist in 'cached_rc'
 836 * and return 0 on success.
 837 */
 838static int generate_cached_repolist(const char *path, const char *cached_rc)
 839{
 840	struct strbuf locked_rc = STRBUF_INIT;
 841	int result = 0;
 842	int idx;
 843	FILE *f;
 844
 845	strbuf_addf(&locked_rc, "%s.lock", cached_rc);
 846	f = fopen(locked_rc.buf, "wx");
 847	if (!f) {
 848		/* Inform about the error unless the lockfile already existed,
 849		 * since that only means we've got concurrent requests.
 850		 */
 851		result = errno;
 852		if (result != EEXIST)
 853			fprintf(stderr, "[cgit] Error opening %s: %s (%d)\n",
 854				locked_rc.buf, strerror(result), result);
 855		goto out;
 856	}
 857	idx = cgit_repolist.count;
 858	if (ctx.cfg.project_list)
 859		scan_projects(path, ctx.cfg.project_list, repo_config);
 860	else
 861		scan_tree(path, repo_config);
 862	print_repolist(f, &cgit_repolist, idx);
 863	if (rename(locked_rc.buf, cached_rc))
 864		fprintf(stderr, "[cgit] Error renaming %s to %s: %s (%d)\n",
 865			locked_rc.buf, cached_rc, strerror(errno), errno);
 866	fclose(f);
 867out:
 868	strbuf_release(&locked_rc);
 869	return result;
 870}
 871
 872static void process_cached_repolist(const char *path)
 873{
 874	struct stat st;
 875	struct strbuf cached_rc = STRBUF_INIT;
 876	time_t age;
 877	unsigned long hash;
 878
 879	hash = hash_str(path);
 880	if (ctx.cfg.project_list)
 881		hash += hash_str(ctx.cfg.project_list);
 882	strbuf_addf(&cached_rc, "%s/rc-%8lx", ctx.cfg.cache_root, hash);
 883
 884	if (stat(cached_rc.buf, &st)) {
 885		/* Nothing is cached, we need to scan without forking. And
 886		 * if we fail to generate a cached repolist, we need to
 887		 * invoke scan_tree manually.
 888		 */
 889		if (generate_cached_repolist(path, cached_rc.buf)) {
 890			if (ctx.cfg.project_list)
 891				scan_projects(path, ctx.cfg.project_list,
 892					      repo_config);
 893			else
 894				scan_tree(path, repo_config);
 895		}
 896		goto out;
 897	}
 898
 899	parse_configfile(cached_rc.buf, config_cb);
 900
 901	/* If the cached configfile hasn't expired, lets exit now */
 902	age = time(NULL) - st.st_mtime;
 903	if (age <= (ctx.cfg.cache_scanrc_ttl * 60))
 904		goto out;
 905
 906	/* The cached repolist has been parsed, but it was old. So lets
 907	 * rescan the specified path and generate a new cached repolist
 908	 * in a child-process to avoid latency for the current request.
 909	 */
 910	if (fork())
 911		goto out;
 912
 913	exit(generate_cached_repolist(path, cached_rc.buf));
 914out:
 915	strbuf_release(&cached_rc);
 916}
 917
 918static void cgit_parse_args(int argc, const char **argv)
 919{
 920	int i;
 921	int scan = 0;
 922
 923	for (i = 1; i < argc; i++) {
 924		if (!prefixcmp(argv[i], "--cache=")) {
 925			ctx.cfg.cache_root = xstrdup(argv[i] + 8);
 926		} else if (!strcmp(argv[i], "--nocache")) {
 927			ctx.cfg.nocache = 1;
 928		} else if (!strcmp(argv[i], "--nohttp")) {
 929			ctx.env.no_http = "1";
 930		} else if (!prefixcmp(argv[i], "--query=")) {
 931			ctx.qry.raw = xstrdup(argv[i] + 8);
 932		} else if (!prefixcmp(argv[i], "--repo=")) {
 933			ctx.qry.repo = xstrdup(argv[i] + 7);
 934		} else if (!prefixcmp(argv[i], "--page=")) {
 935			ctx.qry.page = xstrdup(argv[i] + 7);
 936		} else if (!prefixcmp(argv[i], "--head=")) {
 937			ctx.qry.head = xstrdup(argv[i] + 7);
 938			ctx.qry.has_symref = 1;
 939		} else if (!prefixcmp(argv[i], "--sha1=")) {
 940			ctx.qry.sha1 = xstrdup(argv[i] + 7);
 941			ctx.qry.has_sha1 = 1;
 942		} else if (!prefixcmp(argv[i], "--ofs=")) {
 943			ctx.qry.ofs = atoi(argv[i] + 6);
 944		} else if (!prefixcmp(argv[i], "--scan-tree=") ||
 945		           !prefixcmp(argv[i], "--scan-path=")) {
 946			/*
 947			 * HACK: The global snapshot bit mask defines the set
 948			 * of allowed snapshot formats, but the config file
 949			 * hasn't been parsed yet so the mask is currently 0.
 950			 * By setting all bits high before scanning we make
 951			 * sure that any in-repo cgitrc snapshot setting is
 952			 * respected by scan_tree().
 953			 *
 954			 * NOTE: We assume that there aren't more than 8
 955			 * different snapshot formats supported by cgit...
 956			 */
 957			ctx.cfg.snapshots = 0xFF;
 958			scan++;
 959			scan_tree(argv[i] + 12, repo_config);
 960		}
 961	}
 962	if (scan) {
 963		qsort(cgit_repolist.repos, cgit_repolist.count,
 964			sizeof(struct cgit_repo), cmp_repos);
 965		print_repolist(stdout, &cgit_repolist, 0);
 966		exit(0);
 967	}
 968}
 969
 970static int calc_ttl()
 971{
 972	if (!ctx.repo)
 973		return ctx.cfg.cache_root_ttl;
 974
 975	if (!ctx.qry.page)
 976		return ctx.cfg.cache_repo_ttl;
 977
 978	if (!strcmp(ctx.qry.page, "about"))
 979		return ctx.cfg.cache_about_ttl;
 980
 981	if (ctx.qry.has_sha1)
 982		return ctx.cfg.cache_static_ttl;
 983
 984	if (ctx.qry.has_symref)
 985		return ctx.cfg.cache_dynamic_ttl;
 986
 987	return ctx.cfg.cache_repo_ttl;
 988}
 989
 990int main(int argc, const char **argv)
 991{
 992	const char *path;
 993	int err, ttl;
 994
 995	cgit_init_filters();
 996	atexit(cgit_cleanup_filters);
 997
 998	prepare_context();
 999	cgit_repolist.length = 0;
1000	cgit_repolist.count = 0;
1001	cgit_repolist.repos = NULL;
1002
1003	cgit_parse_args(argc, argv);
1004	parse_configfile(expand_macros(ctx.env.cgit_config), config_cb);
1005	ctx.repo = NULL;
1006	http_parse_querystring(ctx.qry.raw, querystring_cb);
1007
1008	/* If virtual-root isn't specified in cgitrc, lets pretend
1009	 * that virtual-root equals SCRIPT_NAME, minus any possibly
1010	 * trailing slashes.
1011	 */
1012	if (!ctx.cfg.virtual_root && ctx.cfg.script_name)
1013		ctx.cfg.virtual_root = ensure_end(ctx.cfg.script_name, '/');
1014
1015	/* If no url parameter is specified on the querystring, lets
1016	 * use PATH_INFO as url. This allows cgit to work with virtual
1017	 * urls without the need for rewriterules in the webserver (as
1018	 * long as PATH_INFO is included in the cache lookup key).
1019	 */
1020	path = ctx.env.path_info;
1021	if (!ctx.qry.url && path) {
1022		if (path[0] == '/')
1023			path++;
1024		ctx.qry.url = xstrdup(path);
1025		if (ctx.qry.raw) {
1026			char *newqry = fmtalloc("%s?%s", path, ctx.qry.raw);
1027			free(ctx.qry.raw);
1028			ctx.qry.raw = newqry;
1029		} else
1030			ctx.qry.raw = xstrdup(ctx.qry.url);
1031		cgit_parse_url(ctx.qry.url);
1032	}
1033
1034	/* Before we go any further, we set ctx.env.authenticated by checking to see
1035	 * if the supplied cookie is valid. All cookies are valid if there is no
1036	 * auth_filter. If there is an auth_filter, the filter decides. */
1037	authenticate_cookie();
1038
1039	ttl = calc_ttl();
1040	if (ttl < 0)
1041		ctx.page.expires += 10 * 365 * 24 * 60 * 60; /* 10 years */
1042	else
1043		ctx.page.expires += ttl * 60;
1044	if (!ctx.env.authenticated || (ctx.env.request_method && !strcmp(ctx.env.request_method, "HEAD")))
1045		ctx.cfg.nocache = 1;
1046	if (ctx.cfg.nocache)
1047		ctx.cfg.cache_size = 0;
1048	err = cache_process(ctx.cfg.cache_size, ctx.cfg.cache_root,
1049			    ctx.qry.raw, ttl, process_request);
1050	cgit_cleanup_filters();
1051	if (err)
1052		cgit_print_error("Error processing page: %s (%d)",
1053				 strerror(err), err);
1054	return err;
1055}