zfs/contrib/dracut/90zfs/zfs-nonroot-necessities.service.in

[Unit]
Before=initrd-root-fs.target
After=sysroot.mount
DefaultDependencies=no
ConditionEnvironment=BOOTFS

[Service]
Type=oneshot
PassEnvironment=BOOTFS
ExecStart=/bin/sh -c '                                                \
    . /lib/dracut-zfs-lib.sh;                                         \
    _zfs_nonroot_necessities_cb() {                                   \
        @sbindir@/zfs mount | grep -m1 -q "^$1 " && return 0;         \
        echo "Mounting $1 on /sysroot$2";                             \
        mount -o zfsutil -t zfs "$1" "/sysroot$2";                    \
    };                                                                \
    for_relevant_root_children "${BOOTFS}" _zfs_nonroot_necessities_cb'

[Install]
RequiredBy=initrd-root-fs.target