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
 82	if (cgit_query_page) {
 83	    if (cgit_repo->snapshots && !strcmp(cgit_query_page, "snapshot")) {
 84		cgit_print_snapshot(item, cgit_query_sha1, "zip",
 85				    cgit_repo->url, cgit_query_name);
 86		return;
 87	    }
 88	    if (!strcmp(cgit_query_page, "blob")) {
 89		    cgit_print_blob(item, cgit_query_sha1, cgit_query_path);
 90		    return;
 91	    }
 92	}
 93
 94	if (cgit_query_page && !strcmp(cgit_query_page, "log"))
 95		show_search = 1;
 96
 97	cgit_print_docstart(title, item);
 98
 99
100	if (!cgit_query_page) {
101		cgit_print_pageheader("summary", show_search);
102		cgit_print_summary();
103		cgit_print_docend();
104		return;
105	}
106
107	cgit_print_pageheader(cgit_query_page, show_search);
108
109	if (!strcmp(cgit_query_page, "log")) {
110		cgit_print_log(cgit_query_head, cgit_query_ofs,
111			       cgit_max_commit_count, cgit_query_search,
112			       cgit_query_path);
113	} else if (!strcmp(cgit_query_page, "tree")) {
114		cgit_print_tree(cgit_query_head, cgit_query_sha1, cgit_query_path);
115	} else if (!strcmp(cgit_query_page, "commit")) {
116		cgit_print_commit(cgit_query_sha1);
117	} else if (!strcmp(cgit_query_page, "view")) {
118		cgit_print_view(cgit_query_sha1, cgit_query_path);
119	} else if (!strcmp(cgit_query_page, "diff")) {
120		cgit_print_diff(cgit_query_sha1, cgit_query_sha2, cgit_query_path);
121	} else {
122		cgit_print_error("Invalid request");
123	}
124	cgit_print_docend();
125}
126
127static void cgit_fill_cache(struct cacheitem *item, int use_cache)
128{
129	static char buf[PATH_MAX];
130	int stdout2;
131
132	getcwd(buf, sizeof(buf));
133	item->st.st_mtime = time(NULL);
134
135	if (use_cache) {
136		stdout2 = chk_positive(dup(STDOUT_FILENO),
137				       "Preserving STDOUT");
138		chk_zero(close(STDOUT_FILENO), "Closing STDOUT");
139		chk_positive(dup2(item->fd, STDOUT_FILENO), "Dup2(cachefile)");
140	}
141
142	if (cgit_query_repo)
143		cgit_print_repo_page(item);
144	else
145		cgit_print_repolist(item);
146
147	if (use_cache) {
148		chk_zero(close(STDOUT_FILENO), "Close redirected STDOUT");
149		chk_positive(dup2(stdout2, STDOUT_FILENO),
150			     "Restoring original STDOUT");
151		chk_zero(close(stdout2), "Closing temporary STDOUT");
152	}
153
154	chdir(buf);
155}
156
157static void cgit_check_cache(struct cacheitem *item)
158{
159	int i = 0;
160
161 top:
162	if (++i > cgit_max_lock_attempts) {
163		die("cgit_refresh_cache: unable to lock %s: %s",
164		    item->name, strerror(errno));
165	}
166	if (!cache_exist(item)) {
167		if (!cache_lock(item)) {
168			sleep(1);
169			goto top;
170		}
171		if (!cache_exist(item)) {
172			cgit_fill_cache(item, 1);
173			cache_unlock(item);
174		} else {
175			cache_cancel_lock(item);
176		}
177	} else if (cache_expired(item) && cache_lock(item)) {
178		if (cache_expired(item)) {
179			cgit_fill_cache(item, 1);
180			cache_unlock(item);
181		} else {
182			cache_cancel_lock(item);
183		}
184	}
185}
186
187static void cgit_print_cache(struct cacheitem *item)
188{
189	static char buf[4096];
190	ssize_t i;
191
192	int fd = open(item->name, O_RDONLY);
193	if (fd<0)
194		die("Unable to open cached file %s", item->name);
195
196	while((i=read(fd, buf, sizeof(buf))) > 0)
197		write(STDOUT_FILENO, buf, i);
198
199	close(fd);
200}
201
202static void cgit_parse_args(int argc, const char **argv)
203{
204	int i;
205
206	for (i = 1; i < argc; i++) {
207		if (!strncmp(argv[i], "--cache=", 8)) {
208			cgit_cache_root = xstrdup(argv[i]+8);
209		}
210		if (!strcmp(argv[i], "--nocache")) {
211			cgit_nocache = 1;
212		}
213		if (!strncmp(argv[i], "--query=", 8)) {
214			cgit_querystring = xstrdup(argv[i]+8);
215		}
216		if (!strncmp(argv[i], "--repo=", 7)) {
217			cgit_query_repo = xstrdup(argv[i]+7);
218		}
219		if (!strncmp(argv[i], "--page=", 7)) {
220			cgit_query_page = xstrdup(argv[i]+7);
221		}
222		if (!strncmp(argv[i], "--head=", 7)) {
223			cgit_query_head = xstrdup(argv[i]+7);
224			cgit_query_has_symref = 1;
225		}
226		if (!strncmp(argv[i], "--sha1=", 7)) {
227			cgit_query_sha1 = xstrdup(argv[i]+7);
228			cgit_query_has_sha1 = 1;
229		}
230		if (!strncmp(argv[i], "--ofs=", 6)) {
231			cgit_query_ofs = atoi(argv[i]+6);
232		}
233	}
234}
235
236int main(int argc, const char **argv)
237{
238	struct cacheitem item;
239
240	htmlfd = STDOUT_FILENO;
241	item.st.st_mtime = time(NULL);
242	cgit_repolist.length = 0;
243	cgit_repolist.count = 0;
244	cgit_repolist.repos = NULL;
245
246	cgit_read_config(CGIT_CONFIG, cgit_global_config_cb);
247	if (getenv("SCRIPT_NAME"))
248		cgit_script_name = xstrdup(getenv("SCRIPT_NAME"));
249	if (getenv("QUERY_STRING"))
250		cgit_querystring = xstrdup(getenv("QUERY_STRING"));
251	cgit_parse_args(argc, argv);
252	cgit_parse_query(cgit_querystring, cgit_querystring_cb);
253	if (!cgit_prepare_cache(&item))
254		return 0;
255	if (cgit_nocache) {
256		cgit_fill_cache(&item, 0);
257	} else {
258		cgit_check_cache(&item);
259		cgit_print_cache(&item);
260	}
261	return 0;
262}