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	} else if (!strcmp(cgit_query_page, "diff")) {
 40		cgit_print_diff(cgit_query_sha1, cgit_query_sha2);
 41	}
 42	cgit_print_docend();
 43}
 44
 45static void cgit_fill_cache(struct cacheitem *item)
 46{
 47	static char buf[PATH_MAX];
 48
 49	getcwd(buf, sizeof(buf));
 50	htmlfd = item->fd;
 51	item->st.st_mtime = time(NULL);
 52	if (cgit_query_repo)
 53		cgit_print_repo_page(item);
 54	else
 55		cgit_print_repolist(item);
 56	chdir(buf);
 57}
 58
 59static void cgit_check_cache(struct cacheitem *item)
 60{
 61	int i = 0;
 62
 63	cache_prepare(item);
 64 top:
 65	if (++i > cgit_max_lock_attempts) {
 66		die("cgit_refresh_cache: unable to lock %s: %s",
 67		    item->name, strerror(errno));
 68	}
 69	if (!cache_exist(item)) {
 70		if (!cache_lock(item)) {
 71			sleep(1);
 72			goto top;
 73		}
 74		if (!cache_exist(item)) {
 75			cgit_fill_cache(item);
 76			cache_unlock(item);
 77		} else {
 78			cache_cancel_lock(item);
 79		}
 80	} else if (cache_expired(item) && cache_lock(item)) {
 81		if (cache_expired(item)) {
 82			cgit_fill_cache(item);
 83			cache_unlock(item);
 84		} else {
 85			cache_cancel_lock(item);
 86		}
 87	}
 88}
 89
 90static void cgit_print_cache(struct cacheitem *item)
 91{
 92	static char buf[4096];
 93	ssize_t i;
 94
 95	int fd = open(item->name, O_RDONLY);
 96	if (fd<0)
 97		die("Unable to open cached file %s", item->name);
 98
 99	while((i=read(fd, buf, sizeof(buf))) > 0)
100		write(STDOUT_FILENO, buf, i);
101
102	close(fd);
103}
104
105static void cgit_parse_args(int argc, const char **argv)
106{
107	int i;
108
109	for (i = 1; i < argc; i++) {
110		if (!strncmp(argv[i], "--root=", 7)) {
111			cgit_root = xstrdup(argv[i]+7);
112		}
113		if (!strncmp(argv[i], "--cache=", 8)) {
114			cgit_cache_root = xstrdup(argv[i]+8);
115		}
116		if (!strcmp(argv[i], "--nocache")) {
117			cgit_nocache = 1;
118		}
119		if (!strncmp(argv[i], "--query=", 8)) {
120			cgit_querystring = xstrdup(argv[i]+8);
121		}
122		if (!strncmp(argv[i], "--repo=", 7)) {
123			cgit_query_repo = xstrdup(argv[i]+7);
124		}
125		if (!strncmp(argv[i], "--page=", 7)) {
126			cgit_query_page = xstrdup(argv[i]+7);
127		}
128		if (!strncmp(argv[i], "--head=", 7)) {
129			cgit_query_head = xstrdup(argv[i]+7);
130			cgit_query_has_symref = 1;
131		}
132		if (!strncmp(argv[i], "--sha1=", 7)) {
133			cgit_query_sha1 = xstrdup(argv[i]+7);
134			cgit_query_has_sha1 = 1;
135		}
136		if (!strncmp(argv[i], "--ofs=", 6)) {
137			cgit_query_ofs = atoi(argv[i]+6);
138		}
139	}
140}
141
142int main(int argc, const char **argv)
143{
144	struct cacheitem item;
145
146	cgit_read_config("/etc/cgitrc", cgit_global_config_cb);
147	if (getenv("QUERY_STRING"))
148		cgit_querystring = xstrdup(getenv("QUERY_STRING"));
149	cgit_parse_args(argc, argv);
150	cgit_parse_query(cgit_querystring, cgit_querystring_cb);
151
152	if (cgit_nocache) {
153		item.fd = STDOUT_FILENO;
154		cgit_fill_cache(&item);
155	} else {
156		cgit_check_cache(&item);
157		cgit_print_cache(&item);
158	}
159	return 0;
160}