track unix sockets inode to reduce accidental removal on vacuum

core/socket.c

@@ -1714,6 +1714,10 @@ void uwsgi_bind_sockets() {
 					uwsgi_chown(uwsgi_sock->name, uwsgi.chown_socket);
 				}
 				uwsgi_log("uwsgi socket %d bound to UNIX address %s fd %d\n", uwsgi_get_socket_num(uwsgi_sock), uwsgi_sock->name, uwsgi_sock->fd);
+				struct stat st;
+				if (uwsgi_sock->name[0] != '@' && !stat(uwsgi_sock->name, &st)) {
+					uwsgi_sock->inode = st.st_ino;
+				}
 			}
 			else {
 #ifdef AF_INET6

core/utils.c

@@ -191,6 +191,8 @@ void daemonize(char *logfile) {
 // get current working directory
 char *uwsgi_get_cwd() {
 
+	if (uwsgi.force_cwd) return uwsgi.force_cwd;
+
 	// set this to static to avoid useless reallocations in stats mode
 	static size_t newsize = 256;
 

core/uwsgi.c

@@ -526,6 +526,7 @@ static struct uwsgi_option uwsgi_base_options[] = {
 	{"log-micros", no_argument, 0, "report response time in microseconds instead of milliseconds", uwsgi_opt_true, &uwsgi.log_micros, 0},
 	{"log-x-forwarded-for", no_argument, 0, "use the ip from X-Forwarded-For header instead of REMOTE_ADDR", uwsgi_opt_true, &uwsgi.log_x_forwarded_for, 0},
 	{"master-as-root", no_argument, 0, "leave master process running as root", uwsgi_opt_true, &uwsgi.master_as_root, 0},
+	{"force-cwd", required_argument, 0, "force the initial working directory to the specified value", uwsgi_opt_set_str, &uwsgi.force_cwd, 0},
 	{"chdir", required_argument, 0, "chdir to specified directory before apps loading", uwsgi_opt_set_str, &uwsgi.chdir, 0},
 	{"chdir2", required_argument, 0, "chdir to specified directory after apps loading", uwsgi_opt_set_str, &uwsgi.chdir2, 0},
 	{"lazy", no_argument, 0, "set lazy mode (load apps in workers instead of master)", uwsgi_opt_true, &uwsgi.lazy, 0},
@@ -1392,6 +1393,13 @@ static void vacuum(void) {
 			}
 			while (uwsgi_sock) {
 				if (uwsgi_sock->family == AF_UNIX && uwsgi_sock->name[0] != '@') {
+					struct stat st;
+					if (!stat(uwsgi_sock->name, &st)) {
+						if (st.st_ino != uwsgi_sock->inode) {
+							uwsgi_log("VACUUM WARNING: unix socket %s changed inode. Skip removal\n", uwsgi_sock->name);
+							goto next;
+						}
+					}
 					if (unlink(uwsgi_sock->name)) {
 						uwsgi_error("unlink()");
 					}
@@ -1399,6 +1407,7 @@ static void vacuum(void) {
 						uwsgi_log("VACUUM: unix socket %s removed.\n", uwsgi_sock->name);
 					}
 				}
+next:
 				uwsgi_sock = uwsgi_sock->next;
 			}
 		}

uwsgi.h

@@ -929,6 +929,9 @@ struct uwsgi_socket {
 	int lazy;
 	int shared;
 	int from_shared;
+
+	// used for avoiding vacuum mess
+	ino_t inode;
 };
 
 struct uwsgi_server;
@@ -2203,6 +2206,7 @@ struct uwsgi_server {
 	int skip_zero;
 	int skip_atexit;
 
+	char *force_cwd;
 	char *chdir;
 	char *chdir2;