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
 13
 14static struct repoinfo *cgit_get_repoinfo(char *url)
 15{
 16	int i;
 17	struct repoinfo *repo;
 18	
 19	for (i=0; i<cgit_repolist.count; i++) {
 20		repo = &cgit_repolist.repos[i];
 21		if (!strcmp(repo->url, url))
 22			return repo;
 23	}
 24	return NULL;
 25}
 26
 27
 28static int cgit_prepare_cache(struct cacheitem *item)
 29{
 30	if (!cgit_query_repo) {
 31		item->name = xstrdup(fmt("%s/index.html", cgit_cache_root));
 32		item->ttl = cgit_cache_root_ttl;
 33		return 1;
 34	}
 35	cgit_repo = cgit_get_repoinfo(cgit_query_repo);
 36	if (!cgit_repo) {
 37		char *title = fmt("%s - %s", cgit_root_title, "Bad request");
 38		cgit_print_docstart(title, item);
 39		cgit_print_pageheader(title, 0);
 40		cgit_print_error(fmt("Unknown repo: %s", cgit_query_repo));
 41		cgit_print_docend();
 42		return 0;
 43	}
 44
 45	if (!cgit_query_page) {
 46		item->name = xstrdup(fmt("%s/%s/index.html", cgit_cache_root, 
 47			   cgit_repo->url));
 48		item->ttl = cgit_cache_repo_ttl;
 49	} else {
 50		item->name = xstrdup(fmt("%s/%s/%s/%s.html", cgit_cache_root, 
 51			   cgit_repo->url, cgit_query_page, 
 52			   cache_safe_filename(cgit_querystring)));
 53		if (cgit_query_has_symref)
 54			item->ttl = cgit_cache_dynamic_ttl;
 55		else if (cgit_query_has_sha1)
 56			item->ttl = cgit_cache_static_ttl;
 57		else
 58			item->ttl = cgit_cache_repo_ttl;
 59	}
 60	return 1;
 61}
 62
 63static void cgit_print_repo_page(struct cacheitem *item)
 64{
 65	char *title;
 66	int show_search;
 67
 68	if (chdir(cgit_repo->path)) {
 69		title = fmt("%s - %s", cgit_root_title, "Bad request");
 70		cgit_print_docstart(title, item);
 71		cgit_print_pageheader(title, 0);
 72		cgit_print_error(fmt("Unable to scan repository: %s",
 73				     strerror(errno)));
 74		cgit_print_docend();
 75		return;
 76	}
 77
 78	title = fmt("%s - %s", cgit_repo->name, cgit_repo->desc);
 79	show_search = 0;
 80	setenv("GIT_DIR", cgit_repo->path, 1);
 81	if (cgit_query_page && !strcmp(cgit_query_page, "log"))
 82		show_search = 1;
 83	cgit_print_docstart(title, item);
 84	cgit_print_pageheader(title, show_search);
 85	if (!cgit_query_page) {
 86		cgit_print_summary();
 87	} else if (!strcmp(cgit_query_page, "log")) {
 88		cgit_print_log(cgit_query_head, cgit_query_ofs, 100, cgit_query_search);
 89	} else if (!strcmp(cgit_query_page, "tree")) {
 90		cgit_print_tree(cgit_query_sha1, cgit_query_path);
 91	} else if (!strcmp(cgit_query_page, "commit")) {
 92		cgit_print_commit(cgit_query_sha1);
 93	} else if (!strcmp(cgit_query_page, "view")) {
 94		cgit_print_view(cgit_query_sha1);
 95	} else if (!strcmp(cgit_query_page, "diff")) {
 96		cgit_print_diff(cgit_query_sha1, cgit_query_sha2);
 97	}
 98	cgit_print_docend();
 99}
100
101static void cgit_fill_cache(struct cacheitem *item)
102{
103	static char buf[PATH_MAX];
104
105	getcwd(buf, sizeof(buf));
106	htmlfd = item->fd;
107	item->st.st_mtime = time(NULL);
108	if (cgit_query_repo)
109		cgit_print_repo_page(item);
110	else
111		cgit_print_repolist(item);
112	chdir(buf);
113}
114
115static void cgit_check_cache(struct cacheitem *item)
116{
117	int i = 0;
118
119 top:
120	if (++i > cgit_max_lock_attempts) {
121		die("cgit_refresh_cache: unable to lock %s: %s",
122		    item->name, strerror(errno));
123	}
124	if (!cache_exist(item)) {
125		if (!cache_lock(item)) {
126			sleep(1);
127			goto top;
128		}
129		if (!cache_exist(item)) {
130			cgit_fill_cache(item);
131			cache_unlock(item);
132		} else {
133			cache_cancel_lock(item);
134		}
135	} else if (cache_expired(item) && cache_lock(item)) {
136		if (cache_expired(item)) {
137			cgit_fill_cache(item);
138			cache_unlock(item);
139		} else {
140			cache_cancel_lock(item);
141		}
142	}
143}
144
145static void cgit_print_cache(struct cacheitem *item)
146{
147	static char buf[4096];
148	ssize_t i;
149
150	int fd = open(item->name, O_RDONLY);
151	if (fd<0)
152		die("Unable to open cached file %s", item->name);
153
154	while((i=read(fd, buf, sizeof(buf))) > 0)
155		write(STDOUT_FILENO, buf, i);
156
157	close(fd);
158}
159
160static void cgit_parse_args(int argc, const char **argv)
161{
162	int i;
163
164	for (i = 1; i < argc; i++) {
165		if (!strncmp(argv[i], "--cache=", 8)) {
166			cgit_cache_root = xstrdup(argv[i]+8);
167		}
168		if (!strcmp(argv[i], "--nocache")) {
169			cgit_nocache = 1;
170		}
171		if (!strncmp(argv[i], "--query=", 8)) {
172			cgit_querystring = xstrdup(argv[i]+8);
173		}
174		if (!strncmp(argv[i], "--repo=", 7)) {
175			cgit_query_repo = xstrdup(argv[i]+7);
176		}
177		if (!strncmp(argv[i], "--page=", 7)) {
178			cgit_query_page = xstrdup(argv[i]+7);
179		}
180		if (!strncmp(argv[i], "--head=", 7)) {
181			cgit_query_head = xstrdup(argv[i]+7);
182			cgit_query_has_symref = 1;
183		}
184		if (!strncmp(argv[i], "--sha1=", 7)) {
185			cgit_query_sha1 = xstrdup(argv[i]+7);
186			cgit_query_has_sha1 = 1;
187		}
188		if (!strncmp(argv[i], "--ofs=", 6)) {
189			cgit_query_ofs = atoi(argv[i]+6);
190		}
191	}
192}
193
194int main(int argc, const char **argv)
195{
196	struct cacheitem item;
197
198	htmlfd = STDOUT_FILENO;
199	item.st.st_mtime = time(NULL);
200	cgit_repolist.length = 0;
201	cgit_repolist.count = 0;
202	cgit_repolist.repos = NULL;
203
204	cgit_read_config("/etc/cgitrc", cgit_global_config_cb);
205	if (getenv("QUERY_STRING"))
206		cgit_querystring = xstrdup(getenv("QUERY_STRING"));
207	cgit_parse_args(argc, argv);
208	cgit_parse_query(cgit_querystring, cgit_querystring_cb);
209	if (!cgit_prepare_cache(&item))
210		return 0;
211	if (cgit_nocache) {
212		item.fd = STDOUT_FILENO;
213		cgit_fill_cache(&item);
214	} else {
215		cgit_check_cache(&item);
216		cgit_print_cache(&item);
217	}
218	return 0;
219}