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nspawn: move $NOTIFY_SOCKET into /run/host/ too

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The sd_notify() socket that nspawn binds that the payload can use to
talk to it was previously stored in /run/systemd/nspawn/notify, which is
weird (as in the previous commit) since this makes /run/systemd
something that is cooperatively maintained by systemd inside the
container and nspawn outside of it.

We now have a better place where container managers can put the stuff
they want to pass to the payload: /run/host/, hence let's make use of
that.

This is not a compat breakage, since the sd_notify() protocol is based
on the $NOTIFY_SOCKET env var, where we place the new socket path.
This commit is contained in:
Lennart Poettering 2020-07-22 18:00:18 +02:00
parent 5a27b39518
commit e96ceabac9
2 changed files with 7 additions and 9 deletions
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14
src/nspawn/nspawn.c
View File

@ -101,10 +101,8 @@
#include "user-util.h"
#include "util.h"
/* nspawn is listening on the socket at the path in the constant nspawn_notify_socket_path
* nspawn_notify_socket_path is relative to the container
* the init process in the container pid can send messages to nspawn following the sd_notify(3) protocol */
#define NSPAWN_NOTIFY_SOCKET_PATH "/run/systemd/nspawn/notify"
/* The notify socket inside the container it can use to talk to nspawn using the sd_notify(3) protocol */
#define NSPAWN_NOTIFY_SOCKET_PATH "/run/host/notify"
#define EXIT_FORCE_RESTART 133
@ -3273,7 +3271,7 @@ static int inner_child(
return log_error_errno(errno, "execv(%s) failed: %m", exec_target);
}
static int setup_sd_notify_child(void) {
static int setup_notify_child(void) {
_cleanup_close_ int fd = -1;
union sockaddr_union sa = {
.un.sun_family = AF_UNIX,
@ -3583,7 +3581,7 @@ static int outer_child(
if (r < 0)
return log_error_errno(r, "Failed to move root directory: %m");
fd = setup_sd_notify_child();
fd = setup_notify_child();
if (fd < 0)
return fd;
@ -3796,7 +3794,7 @@ static int nspawn_dispatch_notify_fd(sd_event_source *source, int fd, uint32_t r
return 0;
}
static int setup_sd_notify_parent(sd_event *event, int fd, pid_t *inner_child_pid, sd_event_source **notify_event_source) {
static int setup_notify_parent(sd_event *event, int fd, pid_t *inner_child_pid, sd_event_source **notify_event_source) {
int r;
r = sd_event_add_io(event, notify_event_source, fd, EPOLLIN, nspawn_dispatch_notify_fd, inner_child_pid);
@ -4627,7 +4625,7 @@ static int run_container(
return log_error_errno(r, "Failed to attach bus to event loop: %m");
}
r = setup_sd_notify_parent(event, notify_socket, PID_TO_PTR(*pid), &notify_event_source);
r = setup_notify_parent(event, notify_socket, PID_TO_PTR(*pid), &notify_event_source);
if (r < 0)
return r;

2
test/units/testsuite-13.sh
View File

@ -60,7 +60,7 @@ function check_norbind {
function check_notification_socket {
# https://github.com/systemd/systemd/issues/4944
local _cmd='echo a | $(busybox which nc) -U -u -w 1 /run/systemd/nspawn/notify'
local _cmd='echo a | $(busybox which nc) -U -u -w 1 /run/host/notify'
# /testsuite-13.nc-container is prepared by test.sh
systemd-nspawn $SUSE_OPTS--register=no -D /testsuite-13.nc-container /bin/sh -x -c "$_cmd"
systemd-nspawn $SUSE_OPTS--register=no -D /testsuite-13.nc-container -U /bin/sh -x -c "$_cmd"