Author: Daniel Baumann <daniel.baumann@progress-linux.org>
Description: Mount /etc/hostname as /run/host/hostname in systemd-nspawn container.

diff -Naurp systemd.orig/src/nspawn/nspawn-mount.c systemd/src/nspawn/nspawn-mount.c
--- systemd.orig/src/nspawn/nspawn-mount.c
+++ systemd/src/nspawn/nspawn-mount.c
@@ -553,6 +553,10 @@ int mount_all(const char *dest,
                   MOUNT_FATAL|MOUNT_MKDIR },
                 { "/run/host",              "/run/host",                    NULL,    NULL,                             MS_BIND,
                   MOUNT_FATAL|MOUNT_MKDIR|MOUNT_PREFIX_ROOT }, /* Prepare this so that we can make it read-only when we are done */
+                { "/etc/hostname",          "/run/host/hostname",           NULL,    NULL,                             MS_BIND,
+                  MOUNT_TOUCH }, /* As per kernel interface requirements, bind mount first (creating mount points) and make read-only later */
+                { NULL,                     "/run/host/hostname",           NULL,    NULL,                             MS_BIND|MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_REMOUNT,
+                  MOUNT_FATAL },
                 { "/etc/os-release",        "/run/host/os-release",         NULL,    NULL,                             MS_BIND,
                   MOUNT_TOUCH }, /* As per kernel interface requirements, bind mount first (creating mount points) and make read-only later */
                 { "/usr/lib/os-release",    "/run/host/os-release",         NULL,    NULL,                             MS_BIND,