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	static char buf[PATH_MAX];
 46
 47	getcwd(buf, sizeof(buf));
 48	htmlfd = item->fd;
 49	item->st.st_mtime = time(NULL);
 50	if (cgit_query_repo)
 51		cgit_print_repo_page(item);
 52	else
 53		cgit_print_repolist(item);
 54	chdir(buf);
 55}
 56
 57static void cgit_check_cache(struct cacheitem *item)
 58{
 59	int i = 0;
 60
 61	cache_prepare(item);
 62 top:
 63	if (++i > cgit_max_lock_attempts) {
 64		die("cgit_refresh_cache: unable to lock %s: %s",
 65		    item->name, strerror(errno));
 66	}
 67	if (!cache_exist(item)) {
 68		if (!cache_lock(item)) {
 69			sleep(1);
 70			goto top;
 71		}
 72		if (!cache_exist(item)) {
 73			cgit_fill_cache(item);
 74			cache_unlock(item);
 75		} else {
 76			cache_cancel_lock(item);
 77		}
 78	} else if (cache_expired(item) && cache_lock(item)) {
 79		if (cache_expired(item)) {
 80			cgit_fill_cache(item);
 81			cache_unlock(item);
 82		} else {
 83			cache_cancel_lock(item);
 84		}
 85	}
 86}
 87
 88static void cgit_print_cache(struct cacheitem *item)
 89{
 90	static char buf[4096];
 91	ssize_t i;
 92
 93	int fd = open(item->name, O_RDONLY);
 94	if (fd<0)
 95		die("Unable to open cached file %s", item->name);
 96
 97	while((i=read(fd, buf, sizeof(buf))) > 0)
 98		write(STDOUT_FILENO, buf, i);
 99
100	close(fd);
101}
102
103static void cgit_parse_args(int argc, const char **argv)
104{
105	int i;
106
107	for (i = 1; i < argc; i++) {
108		if (!strncmp(argv[i], "--root=", 7)) {
109			cgit_root = xstrdup(argv[i]+7);
110		}
111		if (!strncmp(argv[i], "--cache=", 8)) {
112			cgit_cache_root = xstrdup(argv[i]+8);
113		}
114		if (!strcmp(argv[i], "--nocache")) {
115			cgit_nocache = 1;
116		}
117		if (!strncmp(argv[i], "--query=", 8)) {
118			cgit_querystring = xstrdup(argv[i]+8);
119		}
120		if (!strncmp(argv[i], "--repo=", 7)) {
121			cgit_query_repo = xstrdup(argv[i]+7);
122		}
123		if (!strncmp(argv[i], "--page=", 7)) {
124			cgit_query_page = xstrdup(argv[i]+7);
125		}
126		if (!strncmp(argv[i], "--head=", 7)) {
127			cgit_query_head = xstrdup(argv[i]+7);
128			cgit_query_has_symref = 1;
129		}
130		if (!strncmp(argv[i], "--sha1=", 7)) {
131			cgit_query_sha1 = xstrdup(argv[i]+7);
132			cgit_query_has_sha1 = 1;
133		}
134		if (!strncmp(argv[i], "--ofs=", 6)) {
135			cgit_query_ofs = atoi(argv[i]+6);
136		}
137	}
138}
139
140int main(int argc, const char **argv)
141{
142	struct cacheitem item;
143
144	cgit_read_config("/etc/cgitrc", cgit_global_config_cb);
145	if (getenv("QUERY_STRING"))
146		cgit_querystring = xstrdup(getenv("QUERY_STRING"));
147	cgit_parse_args(argc, argv);
148	cgit_parse_query(cgit_querystring, cgit_querystring_cb);
149
150	if (cgit_nocache) {
151		item.fd = STDOUT_FILENO;
152		cgit_fill_cache(&item);
153	} else {
154		cgit_check_cache(&item);
155		cgit_print_cache(&item);
156	}
157	return 0;
158}