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, 0, 100);
 33	} else if (!strcmp(cgit_query_page, "view")) {
 34		cgit_print_view(cgit_query_sha1);
 35	}
 36	cgit_print_docend();
 37}
 38
 39static void cgit_fill_cache(struct cacheitem *item)
 40{
 41	htmlfd = item->fd;
 42	item->st.st_mtime = time(NULL);
 43	if (cgit_query_repo)
 44		cgit_print_repo_page(item);
 45	else
 46		cgit_print_repolist(item);
 47}
 48
 49static void cgit_check_cache(struct cacheitem *item)
 50{
 51	int i = 0;
 52
 53	cache_prepare(item);
 54 top:
 55	if (++i > cgit_max_lock_attempts) {
 56		die("cgit_refresh_cache: unable to lock %s: %s",
 57		    item->name, strerror(errno));
 58	}
 59	if (!cache_exist(item)) {
 60		if (!cache_lock(item)) {
 61			sleep(1);
 62			goto top;
 63		}
 64		if (!cache_exist(item)) {
 65			cgit_fill_cache(item);
 66			cache_unlock(item);
 67		} else {
 68			cache_cancel_lock(item);
 69		}
 70	} else if (cache_expired(item) && cache_lock(item)) {
 71		if (cache_expired(item)) {
 72			cgit_fill_cache(item);
 73			cache_unlock(item);
 74		} else {
 75			cache_cancel_lock(item);
 76		}
 77	}
 78}
 79
 80static void cgit_print_cache(struct cacheitem *item)
 81{
 82	static char buf[4096];
 83	ssize_t i;
 84
 85	int fd = open(item->name, O_RDONLY);
 86	if (fd<0)
 87		die("Unable to open cached file %s", item->name);
 88
 89	while((i=read(fd, buf, sizeof(buf))) > 0)
 90		write(STDOUT_FILENO, buf, i);
 91
 92	close(fd);
 93}
 94
 95int main(int argc, const char **argv)
 96{
 97	struct cacheitem item;
 98
 99	cgit_read_config("/etc/cgitrc", cgit_global_config_cb);
100	cgit_querystring = xstrdup(getenv("QUERY_STRING"));
101	cgit_parse_query(cgit_querystring, cgit_querystring_cb);
102
103	cgit_check_cache(&item);
104	cgit_print_cache(&item);
105	return 0;
106}