tools: remove systemd xenstore socket definitions

On a system with systemd the xenstore sockets are created via systemd.
Remove the related configuration files in order to be able to decide
at runtime whether the sockets should be created or not. This will
enable Xen to start xenstore either via a daemon or via a stub domain.

As the xenstore domain start program will exit after it has done its
job prepare the same behaviour to be tolerated by systemd for the
xenstore daemon by specifying the appropriate flags in the service
file.

A rerun of autogen.sh is required.

Signed-off-by: Juergen Gross <jgross@suse.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>
Acked-by: David Scott <dave@recoil.org>

tools/configure

@@ -9670,7 +9670,7 @@ fi
 
 if test "x$systemd" = "xy"; then :
 
-    ac_config_files="$ac_config_files hotplug/Linux/systemd/proc-xen.mount hotplug/Linux/systemd/var-lib-xenstored.mount hotplug/Linux/systemd/xen-init-dom0.service hotplug/Linux/systemd/xen-qemu-dom0-disk-backend.service hotplug/Linux/systemd/xen-watchdog.service hotplug/Linux/systemd/xenconsoled.service hotplug/Linux/systemd/xendomains.service hotplug/Linux/systemd/xendriverdomain.service hotplug/Linux/systemd/xenstored.service hotplug/Linux/systemd/xenstored.socket hotplug/Linux/systemd/xenstored_ro.socket"
+    ac_config_files="$ac_config_files hotplug/Linux/systemd/proc-xen.mount hotplug/Linux/systemd/var-lib-xenstored.mount hotplug/Linux/systemd/xen-init-dom0.service hotplug/Linux/systemd/xen-qemu-dom0-disk-backend.service hotplug/Linux/systemd/xen-watchdog.service hotplug/Linux/systemd/xenconsoled.service hotplug/Linux/systemd/xendomains.service hotplug/Linux/systemd/xendriverdomain.service hotplug/Linux/systemd/xenstored.service"
 
 
 fi
@@ -10394,8 +10394,6 @@ do
     "hotplug/Linux/systemd/xendomains.service") CONFIG_FILES="$CONFIG_FILES hotplug/Linux/systemd/xendomains.service" ;;
     "hotplug/Linux/systemd/xendriverdomain.service") CONFIG_FILES="$CONFIG_FILES hotplug/Linux/systemd/xendriverdomain.service" ;;
     "hotplug/Linux/systemd/xenstored.service") CONFIG_FILES="$CONFIG_FILES hotplug/Linux/systemd/xenstored.service" ;;
-    "hotplug/Linux/systemd/xenstored.socket") CONFIG_FILES="$CONFIG_FILES hotplug/Linux/systemd/xenstored.socket" ;;
-    "hotplug/Linux/systemd/xenstored_ro.socket") CONFIG_FILES="$CONFIG_FILES hotplug/Linux/systemd/xenstored_ro.socket" ;;
 
   *) as_fn_error $? "invalid argument: \`$ac_config_target'" "$LINENO" 5;;
   esac

tools/configure.ac

@@ -438,8 +438,6 @@ AS_IF([test "x$systemd" = "xy"], [
     hotplug/Linux/systemd/xendomains.service
     hotplug/Linux/systemd/xendriverdomain.service
     hotplug/Linux/systemd/xenstored.service
-    hotplug/Linux/systemd/xenstored.socket
-    hotplug/Linux/systemd/xenstored_ro.socket
     ])
 ])
 

tools/hotplug/Linux/systemd/Makefile

@@ -6,9 +6,6 @@ XEN_SYSTEMD_MODULES = xen.conf
 XEN_SYSTEMD_MOUNT =  proc-xen.mount
 XEN_SYSTEMD_MOUNT += var-lib-xenstored.mount
 
-XEN_SYSTEMD_SOCKET  = xenstored.socket
-XEN_SYSTEMD_SOCKET += xenstored_ro.socket
-
 XEN_SYSTEMD_SERVICE  = xenstored.service
 XEN_SYSTEMD_SERVICE += xenconsoled.service
 XEN_SYSTEMD_SERVICE += xen-qemu-dom0-disk-backend.service
@@ -19,7 +16,6 @@ XEN_SYSTEMD_SERVICE += xendriverdomain.service
 
 ALL_XEN_SYSTEMD =	$(XEN_SYSTEMD_MODULES)  \
 			$(XEN_SYSTEMD_MOUNT)	\
-			$(XEN_SYSTEMD_SOCKET)	\
 			$(XEN_SYSTEMD_SERVICE)
 
 .PHONY: all
@@ -38,7 +34,6 @@ install: $(ALL_XEN_SYSTEMD)
 		$(INSTALL_DIR) $(DESTDIR)$(XEN_SYSTEMD_DIR)
 	[ -d $(DESTDIR)$(XEN_SYSTEMD_MODULES_LOAD) ] || \
 		$(INSTALL_DIR) $(DESTDIR)$(XEN_SYSTEMD_MODULES_LOAD)
-	$(INSTALL_DATA) *.socket $(DESTDIR)$(XEN_SYSTEMD_DIR)
 	$(INSTALL_DATA) *.service $(DESTDIR)$(XEN_SYSTEMD_DIR)
 	$(INSTALL_DATA) *.mount $(DESTDIR)$(XEN_SYSTEMD_DIR)
 	$(INSTALL_DATA) *.conf $(DESTDIR)$(XEN_SYSTEMD_MODULES_LOAD)

tools/hotplug/Linux/systemd/xenstored.service.in

@@ -1,6 +1,6 @@
 [Unit]
 Description=The Xen xenstore
-Requires=xenstored_ro.socket xenstored.socket proc-xen.mount var-lib-xenstored.mount
+Requires=proc-xen.mount var-lib-xenstored.mount
 After=proc-xen.mount var-lib-xenstored.mount
 Before=libvirtd.service libvirt-guests.service
 RefuseManualStop=true
@@ -8,6 +8,8 @@ ConditionPathExists=/proc/xen/capabilities
 
 [Service]
 Type=notify
+NotifyAccess=all
+RemainAfterExit=true
 KillMode=none
 Environment=XENSTORED_ARGS=
 Environment=XENSTORED=@XENSTORED@
@@ -19,6 +21,5 @@ ExecStart=/bin/sh -c "exec $XENSTORED --no-fork $XENSTORED_ARGS"
 
 [Install]
 WantedBy=multi-user.target
-Also=xenstored_ro.socket xenstored.socket
 Also=proc-xen.mount
 Also=var-lib-xenstored.mount

tools/hotplug/Linux/systemd/xenstored.socket.in

@@ -1,13 +0,0 @@
-[Unit]
-Description=xenstore socket
-Requires=proc-xen.mount var-lib-xenstored.mount
-After=proc-xen.mount var-lib-xenstored.mount
-ConditionPathExists=/proc/xen/capabilities
-
-[Socket]
-ListenStream=@XEN_RUN_STORED@/socket
-SocketMode=0600
-Service=xenstored.service
-
-[Install]
-WantedBy=sockets.target

tools/hotplug/Linux/systemd/xenstored_ro.socket.in

@@ -1,13 +0,0 @@
-[Unit]
-Description=xenstore ro socket
-Requires=proc-xen.mount var-lib-xenstored.mount
-After=proc-xen.mount var-lib-xenstored.mount
-ConditionPathExists=/proc/xen/capabilities
-
-[Socket]
-ListenStream=@XEN_RUN_STORED@/socket_ro
-SocketMode=0660
-Service=xenstored.service
-
-[Install]
-WantedBy=sockets.target

tools/ocaml/xenstored/systemd.ml

@@ -12,6 +12,4 @@
  * GNU Lesser General Public License for more details.
  *)
 
-external sd_listen_fds: string -> Unix.file_descr = "ocaml_sd_listen_fds"
-external launched_by_systemd: unit -> bool = "ocaml_launched_by_systemd"
 external sd_notify_ready: unit -> unit = "ocaml_sd_notify_ready"

tools/ocaml/xenstored/systemd.mli

@@ -12,13 +12,5 @@
  * GNU Lesser General Public License for more details.
  *)
 
-(** Calls the C library sd_listen_fds() function for us. Although
- *  the library doesn't accept argument we send one over to help
- *  us do sanity checks on the expected sockets *)
-val sd_listen_fds: string -> Unix.file_descr
-
-(** Tells us whether the process is launched by systemd *)
-val launched_by_systemd: unit -> bool
-
 (** Tells systemd we're ready *)
 external sd_notify_ready: unit -> unit = "ocaml_sd_notify_ready"

tools/ocaml/xenstored/systemd_stubs.c

@@ -25,88 +25,10 @@
 
 #if defined(HAVE_SYSTEMD)
 
-#include <sys/socket.h>
 #include <systemd/sd-daemon.h>
 
 #include "_paths.h"
 
-/* Will work regardless of the order systemd gives them to us */
-static int oxen_get_sd_fd(const char *connect_to)
-{
-	int fd = SD_LISTEN_FDS_START;
-	int r;
-
-	while (fd <= SD_LISTEN_FDS_START + 1) {
-		r = sd_is_socket_unix(fd, SOCK_STREAM, 1, connect_to, 0);
-		if (r > 0)
-			return fd;
-		fd++;
-	}
-
-	return -EBADR;
-}
-
-static int oxen_verify_socket_socket(const char *connect_to)
-{
-	if ((strcmp(XEN_RUN_STORED "/socket_ro", connect_to) != 0) &&
-	    (strcmp(XEN_RUN_STORED "/socket", connect_to) != 0)) {
-		sd_notifyf(0, "STATUS=unexpected socket: %s\n"
-			   "ERRNO=%i",
-			   connect_to,
-			   EBADR);
-		return -EBADR;
-	}
-
-	return oxen_get_sd_fd(connect_to);
-}
-
-CAMLprim value ocaml_sd_listen_fds(value connect_to)
-{
-	CAMLparam1(connect_to);
-	CAMLlocal1(sock_ret);
-	int sock = -EBADR, n;
-
-	n = sd_listen_fds(0);
-	if (n <= 0) {
-		sd_notifyf(0, "STATUS=Failed to get any active sockets: %s\n"
-			   "ERRNO=%i",
-			   strerror(errno),
-			   errno);
-		caml_failwith("ocaml_sd_listen_fds() failed to get any sockets");
-	} else if (n != 2) {
-		fprintf(stderr, SD_ERR "Expected 2 fds but given %d\n", n);
-		sd_notifyf(0, "STATUS=Mismatch on number (2): %s\n"
-			   "ERRNO=%d",
-			   strerror(EBADR),
-			   EBADR);
-		caml_failwith("ocaml_sd_listen_fds() mismatch");
-	}
-
-	sock = oxen_verify_socket_socket(String_val(connect_to));
-	if (sock <= 0) {
-		fprintf(stderr, "failed to verify sock %s\n",
-			String_val(connect_to));
-		caml_failwith("ocaml_sd_listen_fds_init() invalid socket");
-	}
-
-	sock_ret = Val_int(sock);
-
-	CAMLreturn(sock_ret);
-}
-
-CAMLprim value ocaml_launched_by_systemd(value ignore)
-{
-	CAMLparam1(ignore);
-	CAMLlocal1(ret);
-
-	ret = Val_false;
-
-	if (sd_listen_fds(0) > 0)
-		ret = Val_true;
-
-	CAMLreturn(ret);
-}
-
 CAMLprim value ocaml_sd_notify_ready(value ignore)
 {
 	CAMLparam1(ignore);
@@ -121,26 +43,6 @@ CAMLprim value ocaml_sd_notify_ready(value ignore)
 
 #else
 
-CAMLprim value ocaml_sd_listen_fds(value connect_to)
-{
-	CAMLparam1(connect_to);
-	CAMLlocal1(sock_ret);
-
-	sock_ret = Val_int(-1U);
-
-	CAMLreturn(sock_ret);
-}
-
-CAMLprim value ocaml_launched_by_systemd(value ignore)
-{
-	CAMLparam1(ignore);
-	CAMLlocal1(ret);
-
-	ret = Val_false;
-
-	CAMLreturn(ret);
-}
-
 CAMLprim value ocaml_sd_notify_ready(value ignore)
 {
 	CAMLparam1(ignore);

tools/ocaml/xenstored/utils.ml

@@ -73,22 +73,15 @@ let trim_path path =
 let join_by_null ls = String.concat "\000" ls
 
 (* unix utils *)
-let create_regular_unix_socket name =
+let create_unix_socket name =
         Unixext.unlink_safe name;
         Unixext.mkdir_rec (Filename.dirname name) 0o700;
         let sockaddr = Unix.ADDR_UNIX(name) in
         let sock = Unix.socket Unix.PF_UNIX Unix.SOCK_STREAM 0 in
-        Unix.set_close_on_exec sock;
         Unix.bind sock sockaddr;
         Unix.listen sock 1;
         sock
 
-let create_unix_socket name =
-        if Systemd.launched_by_systemd() then
-                Systemd.sd_listen_fds name
-        else
-                create_regular_unix_socket name
-
 let read_file_single_integer filename =
 	let fd = Unix.openfile filename [ Unix.O_RDONLY ] 0o640 in
 	let buf = String.make 20 (char_of_int 0) in

tools/ocaml/xenstored/xenstored.ml

@@ -428,8 +428,7 @@ let _ =
 		process_domains store cons domains
 		in
 
-	if Systemd.launched_by_systemd () then
-		Systemd.sd_notify_ready ();
+	Systemd.sd_notify_ready ();
 	while not !quit
 	do
 		try

tools/xenstore/xenstored_core.c

@@ -1788,84 +1788,6 @@ static int destroy_fd(void *_fd)
 	return 0;
 }
 
-#if defined(XEN_SYSTEMD_ENABLED)
-/* Will work regardless of the order systemd gives them to us */
-static int xs_get_sd_fd(const char *connect_to)
-{
-	int fd = SD_LISTEN_FDS_START;
-	int r;
-
-	while (fd <= SD_LISTEN_FDS_START + 1) {
-		r = sd_is_socket_unix(fd, SOCK_STREAM, 1, connect_to, 0);
-		if (r > 0)
-			return fd;
-		fd++;
-	}
-
-	return -EBADR;
-}
-
-static int xs_validate_active_socket(const char *connect_to)
-{
-	if ((strcmp(xs_daemon_socket_ro(), connect_to) != 0) &&
-	    (strcmp(xs_daemon_socket(), connect_to) != 0)) {
-		sd_notifyf(0, "STATUS=unexpected socket: %s\n"
-			   "ERRNO=%i",
-			   connect_to,
-			   EBADR);
-		return -EBADR;
-	}
-
-	return xs_get_sd_fd(connect_to);
-}
-
-/* Return true if started by systemd and false if not. Exit with
- * error if things go wrong.
- */
-static bool systemd_checkin(int **psock, int **pro_sock)
-{
-	int *sock, *ro_sock;
-	const char *soc_str = xs_daemon_socket();
-	const char *soc_str_ro = xs_daemon_socket_ro();
-	int n;
-
-	n = sd_listen_fds(0);
-
-	if (n == 0)
-		return false;
-
-	if (n < 0) {
-		sd_notifyf(0, "STATUS=Failed to get any active sockets: %s\n"
-			   "ERRNO=%i",
-			   strerror(errno),
-			   errno);
-		barf_perror("sd_listen_fds() failed\n");
-	} else if (n != 2) {
-		fprintf(stderr, SD_ERR "Expected 2 fds but given %d\n", n);
-		sd_notifyf(0, "STATUS=Mismatch on number (2): %s\n"
-			   "ERRNO=%d",
-			   strerror(EBADR),
-			   EBADR);
-		barf_perror("sd_listen_fds() gave too many fds\n");
-	}
-
-	*psock = sock = talloc(talloc_autofree_context(), int);
-	*sock = xs_validate_active_socket(soc_str);
-	if (*sock <= 0)
-		barf_perror("%s", soc_str);
-
-	*pro_sock = ro_sock = talloc(talloc_autofree_context(), int);
-	*ro_sock = xs_validate_active_socket(soc_str_ro);
-	if (*ro_sock <= 0)
-		barf_perror("%s", soc_str_ro);
-
-	talloc_set_destructor(sock, destroy_fd);
-	talloc_set_destructor(ro_sock, destroy_fd);
-
-	return true;
-}
-#endif
-
 static void init_sockets(int **psock, int **pro_sock)
 {
 	struct sockaddr_un addr;
@@ -1984,9 +1906,7 @@ int main(int argc, char *argv[])
 	const char *pidfile = NULL;
 	const char *memfile = NULL;
 	int timeout;
-#if defined(XEN_SYSTEMD_ENABLED)
-	bool systemd;
-#endif
+
 
 	while ((opt = getopt_long(argc, argv, "DE:F:HNPS:t:T:RLVW:M:", options,
 				  NULL)) != -1) {
@@ -2050,16 +1970,6 @@ int main(int argc, char *argv[])
 	if (optind != argc)
 		barf("%s: No arguments desired", argv[0]);
 
-#if defined(XEN_SYSTEMD_ENABLED)
-	systemd = systemd_checkin(&sock, &ro_sock);
-	if (systemd) {
-		dofork = false;
-		if (pidfile)
-			xprintf("%s: PID file not needed on systemd", argv[0]);
-		pidfile = NULL;
-	}
-#endif
-
 	reopen_log();
 
 	/* make sure xenstored directories exist */
@@ -2086,10 +1996,7 @@ int main(int argc, char *argv[])
 		signal(SIGUSR1, do_talloc_report);
 	}
 
-#if defined(XEN_SYSTEMD_ENABLED)
-	if (!systemd)
-#endif
-		init_sockets(&sock, &ro_sock);
+	init_sockets(&sock, &ro_sock);
 
 	init_pipe(reopen_log_pipe);
 
@@ -2122,10 +2029,8 @@ int main(int argc, char *argv[])
 	xenbus_notify_running();
 
 #if defined(XEN_SYSTEMD_ENABLED)
-	if (systemd) {
-		sd_notify(1, "READY=1");
-		fprintf(stderr, SD_NOTICE "xenstored is ready\n");
-	}
+	sd_notify(1, "READY=1");
+	fprintf(stderr, SD_NOTICE "xenstored is ready\n");
 #endif
 
 	/* Main loop. */