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
 11const char cgit_version[] = CGIT_VERSION;
 12
 13static void cgit_print_repo_page(struct cacheitem *item)
 14{
 15	if (chdir(fmt("%s/%s", cgit_root, cgit_query_repo)) || 
 16	    cgit_read_config("info/cgit", cgit_repo_config_cb)) {
 17		char *title = fmt("%s - %s", cgit_root_title, "Bad request");
 18		cgit_print_docstart(title, item);
 19		cgit_print_pageheader(title);
 20		cgit_print_error(fmt("Unable to scan repository: %s",
 21				     strerror(errno)));
 22		cgit_print_docend();
 23		return;
 24	}
 25	setenv("GIT_DIR", fmt("%s/%s", cgit_root, cgit_query_repo), 1);
 26	char *title = fmt("%s - %s", cgit_repo_name, cgit_repo_desc);
 27	cgit_print_docstart(title, item);
 28	cgit_print_pageheader(title);
 29	if (!cgit_query_page) {
 30		cgit_print_summary();
 31	} else if (!strcmp(cgit_query_page, "log")) {
 32		cgit_print_log(cgit_query_head, cgit_query_ofs, 100);
 33	} else if (!strcmp(cgit_query_page, "tree")) {
 34		cgit_print_tree(cgit_query_sha1);
 35	} else if (!strcmp(cgit_query_page, "view")) {
 36		cgit_print_view(cgit_query_sha1);
 37	}
 38	cgit_print_docend();
 39}
 40
 41static void cgit_fill_cache(struct cacheitem *item)
 42{
 43	htmlfd = item->fd;
 44	item->st.st_mtime = time(NULL);
 45	if (cgit_query_repo)
 46		cgit_print_repo_page(item);
 47	else
 48		cgit_print_repolist(item);
 49}
 50
 51static void cgit_check_cache(struct cacheitem *item)
 52{
 53	int i = 0;
 54
 55	cache_prepare(item);
 56 top:
 57	if (++i > cgit_max_lock_attempts) {
 58		die("cgit_refresh_cache: unable to lock %s: %s",
 59		    item->name, strerror(errno));
 60	}
 61	if (!cache_exist(item)) {
 62		if (!cache_lock(item)) {
 63			sleep(1);
 64			goto top;
 65		}
 66		if (!cache_exist(item)) {
 67			cgit_fill_cache(item);
 68			cache_unlock(item);
 69		} else {
 70			cache_cancel_lock(item);
 71		}
 72	} else if (cache_expired(item) && cache_lock(item)) {
 73		if (cache_expired(item)) {
 74			cgit_fill_cache(item);
 75			cache_unlock(item);
 76		} else {
 77			cache_cancel_lock(item);
 78		}
 79	}
 80}
 81
 82static void cgit_print_cache(struct cacheitem *item)
 83{
 84	static char buf[4096];
 85	ssize_t i;
 86
 87	int fd = open(item->name, O_RDONLY);
 88	if (fd<0)
 89		die("Unable to open cached file %s", item->name);
 90
 91	while((i=read(fd, buf, sizeof(buf))) > 0)
 92		write(STDOUT_FILENO, buf, i);
 93
 94	close(fd);
 95}
 96
 97int main(int argc, const char **argv)
 98{
 99	struct cacheitem item;
100
101	cgit_read_config("/etc/cgitrc", cgit_global_config_cb);
102	cgit_querystring = xstrdup(getenv("QUERY_STRING"));
103	cgit_parse_query(cgit_querystring, cgit_querystring_cb);
104
105	cgit_check_cache(&item);
106	cgit_print_cache(&item);
107	return 0;
108}