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, "commit")) {
 36		cgit_print_commit(cgit_query_sha1);
 37	} else if (!strcmp(cgit_query_page, "view")) {
 38		cgit_print_view(cgit_query_sha1);
 39	}
 40	cgit_print_docend();
 41}
 42
 43static void cgit_fill_cache(struct cacheitem *item)
 44{
 45	htmlfd = item->fd;
 46	item->st.st_mtime = time(NULL);
 47	if (cgit_query_repo)
 48		cgit_print_repo_page(item);
 49	else
 50		cgit_print_repolist(item);
 51}
 52
 53static void cgit_check_cache(struct cacheitem *item)
 54{
 55	int i = 0;
 56
 57	cache_prepare(item);
 58 top:
 59	if (++i > cgit_max_lock_attempts) {
 60		die("cgit_refresh_cache: unable to lock %s: %s",
 61		    item->name, strerror(errno));
 62	}
 63	if (!cache_exist(item)) {
 64		if (!cache_lock(item)) {
 65			sleep(1);
 66			goto top;
 67		}
 68		if (!cache_exist(item)) {
 69			cgit_fill_cache(item);
 70			cache_unlock(item);
 71		} else {
 72			cache_cancel_lock(item);
 73		}
 74	} else if (cache_expired(item) && cache_lock(item)) {
 75		if (cache_expired(item)) {
 76			cgit_fill_cache(item);
 77			cache_unlock(item);
 78		} else {
 79			cache_cancel_lock(item);
 80		}
 81	}
 82}
 83
 84static void cgit_print_cache(struct cacheitem *item)
 85{
 86	static char buf[4096];
 87	ssize_t i;
 88
 89	int fd = open(item->name, O_RDONLY);
 90	if (fd<0)
 91		die("Unable to open cached file %s", item->name);
 92
 93	while((i=read(fd, buf, sizeof(buf))) > 0)
 94		write(STDOUT_FILENO, buf, i);
 95
 96	close(fd);
 97}
 98
 99int main(int argc, const char **argv)
100{
101	struct cacheitem item;
102
103	cgit_read_config("/etc/cgitrc", cgit_global_config_cb);
104	cgit_querystring = xstrdup(getenv("QUERY_STRING"));
105	cgit_parse_query(cgit_querystring, cgit_querystring_cb);
106
107	cgit_check_cache(&item);
108	cgit_print_cache(&item);
109	return 0;
110}