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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 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
 18const char *cgit_version = CGIT_VERSION;
 19
 20void 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
 28struct 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
 43static void process_cached_repolist(const char *path);
 44
 45void 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, "max-stats"))
 64		repo->max_stats = cgit_find_stats_period(value, NULL);
 65	else if (!strcmp(name, "module-link"))
 66		repo->module_link= xstrdup(value);
 67	else if (!strcmp(name, "section"))
 68		repo->section = xstrdup(value);
 69	else if (!strcmp(name, "about-filter"))
 70		repo->about_filter = new_filter(value, 0);
 71	else if (!strcmp(name, "commit-filter"))
 72		repo->commit_filter = new_filter(value, 0);
 73	else if (!strcmp(name, "source-filter"))
 74		repo->source_filter = new_filter(value, 1);
 75	else if (!strcmp(name, "readme") && value != NULL) {
 76		if (*value == '/')
 77			ctx.repo->readme = xstrdup(value);
 78		else
 79			ctx.repo->readme = xstrdup(fmt("%s/%s", ctx.repo->path, value));
 80	}
 81}
 82
 83void config_cb(const char *name, const char *value)
 84{
 85	if (!strcmp(name, "section") || !strcmp(name, "repo.group"))
 86		ctx.cfg.section = xstrdup(value);
 87	else if (!strcmp(name, "repo.url"))
 88		ctx.repo = cgit_add_repo(value);
 89	else if (ctx.repo && !strcmp(name, "repo.path"))
 90		ctx.repo->path = trim_end(value, '/');
 91	else if (ctx.repo && !prefixcmp(name, "repo."))
 92		repo_config(ctx.repo, name + 5, value);
 93	else if (!strcmp(name, "root-title"))
 94		ctx.cfg.root_title = xstrdup(value);
 95	else if (!strcmp(name, "root-desc"))
 96		ctx.cfg.root_desc = xstrdup(value);
 97	else if (!strcmp(name, "root-readme"))
 98		ctx.cfg.root_readme = xstrdup(value);
 99	else if (!strcmp(name, "css"))
100		ctx.cfg.css = xstrdup(value);
101	else if (!strcmp(name, "favicon"))
102		ctx.cfg.favicon = xstrdup(value);
103	else if (!strcmp(name, "footer"))
104		ctx.cfg.footer = xstrdup(value);
105	else if (!strcmp(name, "head-include"))
106		ctx.cfg.head_include = xstrdup(value);
107	else if (!strcmp(name, "header"))
108		ctx.cfg.header = xstrdup(value);
109	else if (!strcmp(name, "logo"))
110		ctx.cfg.logo = xstrdup(value);
111	else if (!strcmp(name, "index-header"))
112		ctx.cfg.index_header = xstrdup(value);
113	else if (!strcmp(name, "index-info"))
114		ctx.cfg.index_info = xstrdup(value);
115	else if (!strcmp(name, "logo-link"))
116		ctx.cfg.logo_link = xstrdup(value);
117	else if (!strcmp(name, "module-link"))
118		ctx.cfg.module_link = xstrdup(value);
119	else if (!strcmp(name, "virtual-root")) {
120		ctx.cfg.virtual_root = trim_end(value, '/');
121		if (!ctx.cfg.virtual_root && (!strcmp(value, "/")))
122			ctx.cfg.virtual_root = "";
123	} else if (!strcmp(name, "nocache"))
124		ctx.cfg.nocache = atoi(value);
125	else if (!strcmp(name, "noplainemail"))
126		ctx.cfg.noplainemail = atoi(value);
127	else if (!strcmp(name, "noheader"))
128		ctx.cfg.noheader = atoi(value);
129	else if (!strcmp(name, "snapshots"))
130		ctx.cfg.snapshots = cgit_parse_snapshots_mask(value);
131	else if (!strcmp(name, "enable-index-links"))
132		ctx.cfg.enable_index_links = atoi(value);
133	else if (!strcmp(name, "enable-log-filecount"))
134		ctx.cfg.enable_log_filecount = atoi(value);
135	else if (!strcmp(name, "enable-log-linecount"))
136		ctx.cfg.enable_log_linecount = atoi(value);
137	else if (!strcmp(name, "max-stats"))
138		ctx.cfg.max_stats = cgit_find_stats_period(value, NULL);
139	else if (!strcmp(name, "cache-size"))
140		ctx.cfg.cache_size = atoi(value);
141	else if (!strcmp(name, "cache-root"))
142		ctx.cfg.cache_root = xstrdup(value);
143	else if (!strcmp(name, "cache-root-ttl"))
144		ctx.cfg.cache_root_ttl = atoi(value);
145	else if (!strcmp(name, "cache-repo-ttl"))
146		ctx.cfg.cache_repo_ttl = atoi(value);
147	else if (!strcmp(name, "cache-scanrc-ttl"))
148		ctx.cfg.cache_scanrc_ttl = atoi(value);
149	else if (!strcmp(name, "cache-static-ttl"))
150		ctx.cfg.cache_static_ttl = atoi(value);
151	else if (!strcmp(name, "cache-dynamic-ttl"))
152		ctx.cfg.cache_dynamic_ttl = atoi(value);
153	else if (!strcmp(name, "about-filter"))
154		ctx.cfg.about_filter = new_filter(value, 0);
155	else if (!strcmp(name, "commit-filter"))
156		ctx.cfg.commit_filter = new_filter(value, 0);
157	else if (!strcmp(name, "embedded"))
158		ctx.cfg.embedded = atoi(value);
159	else if (!strcmp(name, "max-message-length"))
160		ctx.cfg.max_msg_len = atoi(value);
161	else if (!strcmp(name, "max-repodesc-length"))
162		ctx.cfg.max_repodesc_len = atoi(value);
163	else if (!strcmp(name, "max-repo-count"))
164		ctx.cfg.max_repo_count = atoi(value);
165	else if (!strcmp(name, "max-commit-count"))
166		ctx.cfg.max_commit_count = atoi(value);
167	else if (!strcmp(name, "scan-path"))
168		if (!ctx.cfg.nocache && ctx.cfg.cache_size)
169			process_cached_repolist(value);
170		else
171			scan_tree(value);
172	else if (!strcmp(name, "source-filter"))
173		ctx.cfg.source_filter = new_filter(value, 1);
174	else if (!strcmp(name, "summary-log"))
175		ctx.cfg.summary_log = atoi(value);
176	else if (!strcmp(name, "summary-branches"))
177		ctx.cfg.summary_branches = atoi(value);
178	else if (!strcmp(name, "summary-tags"))
179		ctx.cfg.summary_tags = atoi(value);
180	else if (!strcmp(name, "agefile"))
181		ctx.cfg.agefile = xstrdup(value);
182	else if (!strcmp(name, "renamelimit"))
183		ctx.cfg.renamelimit = atoi(value);
184	else if (!strcmp(name, "robots"))
185		ctx.cfg.robots = xstrdup(value);
186	else if (!strcmp(name, "clone-prefix"))
187		ctx.cfg.clone_prefix = xstrdup(value);
188	else if (!strcmp(name, "local-time"))
189		ctx.cfg.local_time = atoi(value);
190	else if (!prefixcmp(name, "mimetype."))
191		add_mimetype(name + 9, value);
192	else if (!strcmp(name, "include"))
193		parse_configfile(value, config_cb);
194}
195
196static void querystring_cb(const char *name, const char *value)
197{
198	if (!value)
199		value = "";
200
201	if (!strcmp(name,"r")) {
202		ctx.qry.repo = xstrdup(value);
203		ctx.repo = cgit_get_repoinfo(value);
204	} else if (!strcmp(name, "p")) {
205		ctx.qry.page = xstrdup(value);
206	} else if (!strcmp(name, "url")) {
207		ctx.qry.url = xstrdup(value);
208		cgit_parse_url(value);
209	} else if (!strcmp(name, "qt")) {
210		ctx.qry.grep = xstrdup(value);
211	} else if (!strcmp(name, "q")) {
212		ctx.qry.search = xstrdup(value);
213	} else if (!strcmp(name, "h")) {
214		ctx.qry.head = xstrdup(value);
215		ctx.qry.has_symref = 1;
216	} else if (!strcmp(name, "id")) {
217		ctx.qry.sha1 = xstrdup(value);
218		ctx.qry.has_sha1 = 1;
219	} else if (!strcmp(name, "id2")) {
220		ctx.qry.sha2 = xstrdup(value);
221		ctx.qry.has_sha1 = 1;
222	} else if (!strcmp(name, "ofs")) {
223		ctx.qry.ofs = atoi(value);
224	} else if (!strcmp(name, "path")) {
225		ctx.qry.path = trim_end(value, '/');
226	} else if (!strcmp(name, "name")) {
227		ctx.qry.name = xstrdup(value);
228	} else if (!strcmp(name, "mimetype")) {
229		ctx.qry.mimetype = xstrdup(value);
230	} else if (!strcmp(name, "s")){
231		ctx.qry.sort = xstrdup(value);
232	} else if (!strcmp(name, "showmsg")) {
233		ctx.qry.showmsg = atoi(value);
234	} else if (!strcmp(name, "period")) {
235		ctx.qry.period = xstrdup(value);
236	}
237}
238
239char *xstrdupn(const char *str)
240{
241	return (str ? xstrdup(str) : NULL);
242}
243
244static void prepare_context(struct cgit_context *ctx)
245{
246	memset(ctx, 0, sizeof(ctx));
247	ctx->cfg.agefile = "info/web/last-modified";
248	ctx->cfg.nocache = 0;
249	ctx->cfg.cache_size = 0;
250	ctx->cfg.cache_dynamic_ttl = 5;
251	ctx->cfg.cache_max_create_time = 5;
252	ctx->cfg.cache_repo_ttl = 5;
253	ctx->cfg.cache_root = CGIT_CACHE_ROOT;
254	ctx->cfg.cache_root_ttl = 5;
255	ctx->cfg.cache_scanrc_ttl = 15;
256	ctx->cfg.cache_static_ttl = -1;
257	ctx->cfg.css = "/cgit.css";
258	ctx->cfg.logo = "/cgit.png";
259	ctx->cfg.local_time = 0;
260	ctx->cfg.max_repo_count = 50;
261	ctx->cfg.max_commit_count = 50;
262	ctx->cfg.max_lock_attempts = 5;
263	ctx->cfg.max_msg_len = 80;
264	ctx->cfg.max_repodesc_len = 80;
265	ctx->cfg.max_stats = 0;
266	ctx->cfg.module_link = "./?repo=%s&page=commit&id=%s";
267	ctx->cfg.renamelimit = -1;
268	ctx->cfg.robots = "index, nofollow";
269	ctx->cfg.root_title = "Git repository browser";
270	ctx->cfg.root_desc = "a fast webinterface for the git dscm";
271	ctx->cfg.script_name = CGIT_SCRIPT_NAME;
272	ctx->cfg.summary_branches = 10;
273	ctx->cfg.summary_log = 10;
274	ctx->cfg.summary_tags = 10;
275	ctx->env.cgit_config = xstrdupn(getenv("CGIT_CONFIG"));
276	ctx->env.http_host = xstrdupn(getenv("HTTP_HOST"));
277	ctx->env.https = xstrdupn(getenv("HTTPS"));
278	ctx->env.no_http = xstrdupn(getenv("NO_HTTP"));
279	ctx->env.path_info = xstrdupn(getenv("PATH_INFO"));
280	ctx->env.query_string = xstrdupn(getenv("QUERY_STRING"));
281	ctx->env.request_method = xstrdupn(getenv("REQUEST_METHOD"));
282	ctx->env.script_name = xstrdupn(getenv("SCRIPT_NAME"));
283	ctx->env.server_name = xstrdupn(getenv("SERVER_NAME"));
284	ctx->env.server_port = xstrdupn(getenv("SERVER_PORT"));
285	ctx->page.mimetype = "text/html";
286	ctx->page.charset = PAGE_ENCODING;
287	ctx->page.filename = NULL;
288	ctx->page.size = 0;
289	ctx->page.modified = time(NULL);
290	ctx->page.expires = ctx->page.modified;
291	ctx->page.etag = NULL;
292	memset(&ctx->cfg.mimetypes, 0, sizeof(struct string_list));
293	if (ctx->env.script_name)
294		ctx->cfg.script_name = ctx->env.script_name;
295	if (ctx->env.query_string)
296		ctx->qry.raw = ctx->env.query_string;
297	if (!ctx->env.cgit_config)
298		ctx->env.cgit_config = CGIT_CONFIG;
299}
300
301struct refmatch {
302	char *req_ref;
303	char *first_ref;
304	int match;
305};
306
307int find_current_ref(const char *refname, const unsigned char *sha1,
308		     int flags, void *cb_data)
309{
310	struct refmatch *info;
311
312	info = (struct refmatch *)cb_data;
313	if (!strcmp(refname, info->req_ref))
314		info->match = 1;
315	if (!info->first_ref)
316		info->first_ref = xstrdup(refname);
317	return info->match;
318}
319
320char *find_default_branch(struct cgit_repo *repo)
321{
322	struct refmatch info;
323	char *ref;
324
325	info.req_ref = repo->defbranch;
326	info.first_ref = NULL;
327	info.match = 0;
328	for_each_branch_ref(find_current_ref, &info);
329	if (info.match)
330		ref = info.req_ref;
331	else
332		ref = info.first_ref;
333	if (ref)
334		ref = xstrdup(ref);
335	return ref;
336}
337
338static int prepare_repo_cmd(struct cgit_context *ctx)
339{
340	char *tmp;
341	unsigned char sha1[20];
342	int nongit = 0;
343
344	setenv("GIT_DIR", ctx->repo->path, 1);
345	setup_git_directory_gently(&nongit);
346	if (nongit) {
347		ctx->page.title = fmt("%s - %s", ctx->cfg.root_title,
348				      "config error");
349		tmp = fmt("Not a git repository: '%s'", ctx->repo->path);
350		ctx->repo = NULL;
351		cgit_print_http_headers(ctx);
352		cgit_print_docstart(ctx);
353		cgit_print_pageheader(ctx);
354		cgit_print_error(tmp);
355		cgit_print_docend();
356		return 1;
357	}
358	ctx->page.title = fmt("%s - %s", ctx->repo->name, ctx->repo->desc);
359
360	if (!ctx->qry.head) {
361		ctx->qry.nohead = 1;
362		ctx->qry.head = find_default_branch(ctx->repo);
363		ctx->repo->defbranch = ctx->qry.head;
364	}
365
366	if (!ctx->qry.head) {
367		cgit_print_http_headers(ctx);
368		cgit_print_docstart(ctx);
369		cgit_print_pageheader(ctx);
370		cgit_print_error("Repository seems to be empty");
371		cgit_print_docend();
372		return 1;
373	}
374
375	if (get_sha1(ctx->qry.head, sha1)) {
376		tmp = xstrdup(ctx->qry.head);
377		ctx->qry.head = ctx->repo->defbranch;
378		ctx->page.status = 404;
379		ctx->page.statusmsg = "not found";
380		cgit_print_http_headers(ctx);
381		cgit_print_docstart(ctx);
382		cgit_print_pageheader(ctx);
383		cgit_print_error(fmt("Invalid branch: %s", tmp));
384		cgit_print_docend();
385		return 1;
386	}
387	return 0;
388}
389
390static void process_request(void *cbdata)
391{
392	struct cgit_context *ctx = cbdata;
393	struct cgit_cmd *cmd;
394
395	cmd = cgit_get_cmd(ctx);
396	if (!cmd) {
397		ctx->page.title = "cgit error";
398		cgit_print_http_headers(ctx);
399		cgit_print_docstart(ctx);
400		cgit_print_pageheader(ctx);
401		cgit_print_error("Invalid request");
402		cgit_print_docend();
403		return;
404	}
405
406	if (cmd->want_repo && !ctx->repo) {
407		cgit_print_http_headers(ctx);
408		cgit_print_docstart(ctx);
409		cgit_print_pageheader(ctx);
410		cgit_print_error(fmt("No repository selected"));
411		cgit_print_docend();
412		return;
413	}
414
415	if (ctx->repo && prepare_repo_cmd(ctx))
416		return;
417
418	if (cmd->want_layout) {
419		cgit_print_http_headers(ctx);
420		cgit_print_docstart(ctx);
421		cgit_print_pageheader(ctx);
422	}
423
424	cmd->fn(ctx);
425
426	if (cmd->want_layout)
427		cgit_print_docend();
428}
429
430int cmp_repos(const void *a, const void *b)
431{
432	const struct cgit_repo *ra = a, *rb = b;
433	return strcmp(ra->url, rb->url);
434}
435
436void print_repo(FILE *f, struct cgit_repo *repo)
437{
438	fprintf(f, "repo.url=%s\n", repo->url);
439	fprintf(f, "repo.name=%s\n", repo->name);
440	fprintf(f, "repo.path=%s\n", repo->path);
441	if (repo->owner)
442		fprintf(f, "repo.owner=%s\n", repo->owner);
443	if (repo->desc)
444		fprintf(f, "repo.desc=%s\n", repo->desc);
445	if (repo->readme)
446		fprintf(f, "repo.readme=%s\n", repo->readme);
447	fprintf(f, "\n");
448}
449
450void print_repolist(FILE *f, struct cgit_repolist *list, int start)
451{
452	int i;
453
454	for(i = start; i < list->count; i++)
455		print_repo(f, &list->repos[i]);
456}
457
458/* Scan 'path' for git repositories, save the resulting repolist in 'cached_rc'
459 * and return 0 on success.
460 */
461static int generate_cached_repolist(const char *path, const char *cached_rc)
462{
463	char *locked_rc;
464	int idx;
465	FILE *f;
466
467	locked_rc = xstrdup(fmt("%s.lock", cached_rc));
468	f = fopen(locked_rc, "wx");
469	if (!f) {
470		/* Inform about the error unless the lockfile already existed,
471		 * since that only means we've got concurrent requests.
472		 */
473		if (errno != EEXIST)
474			fprintf(stderr, "[cgit] Error opening %s: %s (%d)\n",
475				locked_rc, strerror(errno), errno);
476		return errno;
477	}
478	idx = cgit_repolist.count;
479	scan_tree(path);
480	print_repolist(f, &cgit_repolist, idx);
481	if (rename(locked_rc, cached_rc))
482		fprintf(stderr, "[cgit] Error renaming %s to %s: %s (%d)\n",
483			locked_rc, cached_rc, strerror(errno), errno);
484	fclose(f);
485	return 0;
486}
487
488static void process_cached_repolist(const char *path)
489{
490	struct stat st;
491	char *cached_rc;
492	time_t age;
493
494	cached_rc = xstrdup(fmt("%s/rc-%8x", ctx.cfg.cache_root,
495		hash_str(path)));
496
497	if (stat(cached_rc, &st)) {
498		/* Nothing is cached, we need to scan without forking. And
499		 * if we fail to generate a cached repolist, we need to
500		 * invoke scan_tree manually.
501		 */
502		if (generate_cached_repolist(path, cached_rc))
503			scan_tree(path);
504		return;
505	}
506
507	parse_configfile(cached_rc, config_cb);
508
509	/* If the cached configfile hasn't expired, lets exit now */
510	age = time(NULL) - st.st_mtime;
511	if (age <= (ctx.cfg.cache_scanrc_ttl * 60))
512		return;
513
514	/* The cached repolist has been parsed, but it was old. So lets
515	 * rescan the specified path and generate a new cached repolist
516	 * in a child-process to avoid latency for the current request.
517	 */
518	if (fork())
519		return;
520
521	exit(generate_cached_repolist(path, cached_rc));
522}
523
524static void cgit_parse_args(int argc, const char **argv)
525{
526	int i;
527	int scan = 0;
528
529	for (i = 1; i < argc; i++) {
530		if (!strncmp(argv[i], "--cache=", 8)) {
531			ctx.cfg.cache_root = xstrdup(argv[i]+8);
532		}
533		if (!strcmp(argv[i], "--nocache")) {
534			ctx.cfg.nocache = 1;
535		}
536		if (!strcmp(argv[i], "--nohttp")) {
537			ctx.env.no_http = "1";
538		}
539		if (!strncmp(argv[i], "--query=", 8)) {
540			ctx.qry.raw = xstrdup(argv[i]+8);
541		}
542		if (!strncmp(argv[i], "--repo=", 7)) {
543			ctx.qry.repo = xstrdup(argv[i]+7);
544		}
545		if (!strncmp(argv[i], "--page=", 7)) {
546			ctx.qry.page = xstrdup(argv[i]+7);
547		}
548		if (!strncmp(argv[i], "--head=", 7)) {
549			ctx.qry.head = xstrdup(argv[i]+7);
550			ctx.qry.has_symref = 1;
551		}
552		if (!strncmp(argv[i], "--sha1=", 7)) {
553			ctx.qry.sha1 = xstrdup(argv[i]+7);
554			ctx.qry.has_sha1 = 1;
555		}
556		if (!strncmp(argv[i], "--ofs=", 6)) {
557			ctx.qry.ofs = atoi(argv[i]+6);
558		}
559		if (!strncmp(argv[i], "--scan-tree=", 12) ||
560		    !strncmp(argv[i], "--scan-path=", 12)) {
561			scan++;
562			scan_tree(argv[i] + 12);
563		}
564	}
565	if (scan) {
566		qsort(cgit_repolist.repos, cgit_repolist.count,
567			sizeof(struct cgit_repo), cmp_repos);
568		print_repolist(stdout, &cgit_repolist, 0);
569		exit(0);
570	}
571}
572
573static int calc_ttl()
574{
575	if (!ctx.repo)
576		return ctx.cfg.cache_root_ttl;
577
578	if (!ctx.qry.page)
579		return ctx.cfg.cache_repo_ttl;
580
581	if (ctx.qry.has_symref)
582		return ctx.cfg.cache_dynamic_ttl;
583
584	if (ctx.qry.has_sha1)
585		return ctx.cfg.cache_static_ttl;
586
587	return ctx.cfg.cache_repo_ttl;
588}
589
590int main(int argc, const char **argv)
591{
592	const char *path;
593	char *qry;
594	int err, ttl;
595
596	prepare_context(&ctx);
597	cgit_repolist.length = 0;
598	cgit_repolist.count = 0;
599	cgit_repolist.repos = NULL;
600
601	cgit_parse_args(argc, argv);
602	parse_configfile(ctx.env.cgit_config, config_cb);
603	ctx.repo = NULL;
604	http_parse_querystring(ctx.qry.raw, querystring_cb);
605
606	/* If virtual-root isn't specified in cgitrc, lets pretend
607	 * that virtual-root equals SCRIPT_NAME.
608	 */
609	if (!ctx.cfg.virtual_root)
610		ctx.cfg.virtual_root = ctx.cfg.script_name;
611
612	/* If no url parameter is specified on the querystring, lets
613	 * use PATH_INFO as url. This allows cgit to work with virtual
614	 * urls without the need for rewriterules in the webserver (as
615	 * long as PATH_INFO is included in the cache lookup key).
616	 */
617	path = ctx.env.path_info;
618	if (!ctx.qry.url && path) {
619		if (path[0] == '/')
620			path++;
621		ctx.qry.url = xstrdup(path);
622		if (ctx.qry.raw) {
623			qry = ctx.qry.raw;
624			ctx.qry.raw = xstrdup(fmt("%s?%s", path, qry));
625			free(qry);
626		} else
627			ctx.qry.raw = xstrdup(ctx.qry.url);
628		cgit_parse_url(ctx.qry.url);
629	}
630
631	ttl = calc_ttl();
632	ctx.page.expires += ttl*60;
633	if (ctx.env.request_method && !strcmp(ctx.env.request_method, "HEAD"))
634		ctx.cfg.nocache = 1;
635	if (ctx.cfg.nocache)
636		ctx.cfg.cache_size = 0;
637	err = cache_process(ctx.cfg.cache_size, ctx.cfg.cache_root,
638			    ctx.qry.raw, ttl, process_request, &ctx);
639	if (err)
640		cgit_print_error(fmt("Error processing page: %s (%d)",
641				     strerror(err), err));
642	return err;
643}