#!/bin/sh
# Work around https://github.com/NetworkBlockDevice/nbd/issues/87
# Additionally, blockdev may be needed when nbd is not a single partition

PREREQ=""

prereqs()
{
    echo "$PREREQ"
}

case "$1" in
    prereqs)
        prereqs
        exit 0
        ;;
esac

# Exit if an LTSP boot was not requested
grep -qs "init=/sbin/init-ltsp" /proc/cmdline || exit 0

if grep -qs 'systemd-mark$' /scripts/local-top/nbd; then
    # Live code patching is ugly, but there's no easy alternative in this case.
    # At least try to match the whole line, to only patch affected versions.
    sed 's/^$NBDCLIENT $nbdsrv -N $nbdpath $nbdport $nbdrootdev -swap -persist -systemd-mark$/& -b 512; blockdev --rereadpt $nbdrootdev/' -i /scripts/local-top/nbd
fi