/* cgit.c: cgi for the git scm * * Copyright (C) 2006 Lars Hjemli * * Licensed under GNU General Public License v2 *   (see COPYING for full license text) */ #include "cgit.h" static int cgit_prepare_cache(struct cacheitem *item){	if (!cgit_repo && cgit_query_repo) {		char *title = fmt("%s - %s", cgit_root_title, "Bad request");		cgit_print_docstart(title, item);		cgit_print_pageheader(title, 0);		cgit_print_error(fmt("Unknown repo: %s", cgit_query_repo));		cgit_print_docend();		return 0;	} 	if (!cgit_repo) {		item->name = xstrdup(fmt("%s/index.html", cgit_cache_root));		item->ttl = cgit_cache_root_ttl;		return 1;	} 	if (!cgit_cmd) {		item->name = xstrdup(fmt("%s/%s/index.%s.html", cgit_cache_root,					 cache_safe_filename(cgit_repo->url),					 cache_safe_filename(cgit_querystring)));		item->ttl = cgit_cache_repo_ttl;	} else {		item->name = xstrdup(fmt("%s/%s/%s/%s.html", cgit_cache_root,					 cache_safe_filename(cgit_repo->url),					 cgit_query_page,					 cache_safe_filename(cgit_querystring)));		if (cgit_query_has_symref)			item->ttl = cgit_cache_dynamic_ttl;		else if (cgit_query_has_sha1)			item->ttl = cgit_cache_static_ttl;		else			item->ttl = cgit_cache_repo_ttl;	}	return 1;} static void cgit_print_repo_page(struct cacheitem *item){	char *title;	int show_search; 	if (!cgit_query_head)		cgit_query_head = cgit_repo->defbranch; 	if (chdir(cgit_repo->path)) {		title = fmt("%s - %s", cgit_root_title, "Bad request");		cgit_print_docstart(title, item);		cgit_print_pageheader(title, 0);		cgit_print_error(fmt("Unable to scan repository: %s",				     strerror(errno)));		cgit_print_docend();		return;	} 	title = fmt("%s - %s", cgit_repo->name, cgit_repo->desc);	show_search = 0;	setenv("GIT_DIR", cgit_repo->path, 1); 	if ((cgit_cmd == CMD_SNAPSHOT) && cgit_repo->snapshots) {		cgit_print_snapshot(item, cgit_query_head, cgit_query_sha1,				    cgit_repobasename(cgit_repo->url),				    cgit_query_path,				    cgit_repo->snapshots );		return;	} 	if (cgit_cmd == CMD_BLOB) {		cgit_print_blob(item, cgit_query_sha1, cgit_query_path);		return;	} 	show_search = (cgit_cmd == CMD_LOG);	cgit_print_docstart(title, item);	if (!cgit_cmd) {		cgit_print_pageheader("summary", show_search);		cgit_print_summary();		cgit_print_docend();		return;	} 	cgit_print_pageheader(cgit_query_page, show_search); 	switch(cgit_cmd) {	case CMD_LOG:		cgit_print_log(cgit_query_sha1, cgit_query_ofs,			       cgit_max_commit_count, cgit_query_grep, cgit_query_search,			       cgit_query_path, 1);		break;	case CMD_TREE:		cgit_print_tree(cgit_query_sha1, cgit_query_path);		break;	case CMD_COMMIT:		cgit_print_commit(cgit_query_sha1);		break;	case CMD_REFS:		cgit_print_refs();		break;	case CMD_TAG:		cgit_print_tag(cgit_query_sha1);		break;	case CMD_DIFF:		cgit_print_diff(cgit_query_sha1, cgit_query_sha2, cgit_query_path);		break;	default:		cgit_print_error("Invalid request");	}	cgit_print_docend();} static void cgit_fill_cache(struct cacheitem *item, int use_cache){	static char buf[PATH_MAX];	int stdout2; 	getcwd(buf, sizeof(buf));	item->st.st_mtime = time(NULL); 	if (use_cache) {		stdout2 = chk_positive(dup(STDOUT_FILENO),				       "Preserving STDOUT");		chk_zero(close(STDOUT_FILENO), "Closing STDOUT");		chk_positive(dup2(item->fd, STDOUT_FILENO), "Dup2(cachefile)");	} 	if (cgit_repo)		cgit_print_repo_page(item);	else		cgit_print_repolist(item); 	if (use_cache) {		chk_zero(close(STDOUT_FILENO), "Close redirected STDOUT");		chk_positive(dup2(stdout2, STDOUT_FILENO),			     "Restoring original STDOUT");		chk_zero(close(stdout2), "Closing temporary STDOUT");	} 	chdir(buf);} static void cgit_check_cache(struct cacheitem *item){	int i = 0;  top:	if (++i > cgit_max_lock_attempts) {		die("cgit_refresh_cache: unable to lock %s: %s",		    item->name, strerror(errno));	}	if (!cache_exist(item)) {		if (!cache_lock(item)) {			sleep(1);			goto top;		}		if (!cache_exist(item)) {			cgit_fill_cache(item, 1);			cache_unlock(item);		} else {			cache_cancel_lock(item);		}	} else if (cache_expired(item) && cache_lock(item)) {		if (cache_expired(item)) {			cgit_fill_cache(item, 1);			cache_unlock(item);		} else {			cache_cancel_lock(item);		}	}} static void cgit_print_cache(struct cacheitem *item){	static char buf[4096];	ssize_t i; 	int fd = open(item->name, O_RDONLY);	if (fd<0)		die("Unable to open cached file %s", item->name); 	while((i=read(fd, buf, sizeof(buf))) > 0)		write(STDOUT_FILENO, buf, i); 	close(fd);} static void cgit_parse_args(int argc, const char **argv){	int i; 	for (i = 1; i < argc; i++) {		if (!strncmp(argv[i], "--cache=", 8)) {			cgit_cache_root = xstrdup(argv[i]+8);		}		if (!strcmp(argv[i], "--nocache")) {			cgit_nocache = 1;		}		if (!strncmp(argv[i], "--query=", 8)) {			cgit_querystring = xstrdup(argv[i]+8);		}		if (!strncmp(argv[i], "--repo=", 7)) {			cgit_query_repo = xstrdup(argv[i]+7);		}		if (!strncmp(argv[i], "--page=", 7)) {			cgit_query_page = xstrdup(argv[i]+7);		}		if (!strncmp(argv[i], "--head=", 7)) {			cgit_query_head = xstrdup(argv[i]+7);			cgit_query_has_symref = 1;		}		if (!strncmp(argv[i], "--sha1=", 7)) {			cgit_query_sha1 = xstrdup(argv[i]+7);			cgit_query_has_sha1 = 1;		}		if (!strncmp(argv[i], "--ofs=", 6)) {			cgit_query_ofs = atoi(argv[i]+6);		}	}} int main(int argc, const char **argv){	struct cacheitem item;	const char *cgit_config_env = getenv("CGIT_CONFIG"); 	htmlfd = STDOUT_FILENO;	item.st.st_mtime = time(NULL);	cgit_repolist.length = 0;	cgit_repolist.count = 0;	cgit_repolist.repos = NULL; 	cgit_read_config(cgit_config_env ? cgit_config_env : CGIT_CONFIG,			 cgit_global_config_cb);	cgit_repo = NULL;	if (getenv("SCRIPT_NAME"))		cgit_script_name = xstrdup(getenv("SCRIPT_NAME"));	if (getenv("QUERY_STRING"))		cgit_querystring = xstrdup(getenv("QUERY_STRING"));	cgit_parse_args(argc, argv);	cgit_parse_query(cgit_querystring, cgit_querystring_cb);	if (!cgit_prepare_cache(&item))		return 0;	if (cgit_nocache) {		cgit_fill_cache(&item, 0);	} else {		cgit_check_cache(&item);		cgit_print_cache(&item);	}	return 0;}