#!/bin/execlineb -P
# SPDX-License-Identifier: EUPL-1.2+
# SPDX-FileCopyrightText: 2022 Alyssa Ross <hi@alyssa.is>

cd /dev
importas -i devname DEVNAME

backtick -E ext {
  backtick -x extspec { redirfd -w 2 /dev/null cat /run/param/ext }
  ifelse { redirfd -w 1 /dev/null printenv extspec }

  {
    importas -iu extspec extspec
    findfs $extspec
  }

  pipeline {
    backtick -E diskpath {
      pipeline { lsblk -lnpo KNAME,PKNAME }
      backtick -E rootpart {
        pipeline { veritysetup status root-verity }
        awk -F ":[[:blank:]]*" "$1 ~ /^[[:blank:]]*data device$/ {print $2; exit}"
      }
      awk -v rootpart=${rootpart} "$1 == rootpart {print $2; exit}"
    }
    lsblk -lnpo PARTTYPE,NAME $diskpath
  }
  awk "$1 == \"9293e1ff-cee4-4658-88be-898ec863944f\" {print $2; exit}"
}

if {
  backtick -E extinode { redirfd -w 2 /dev/null stat -Lc %d:%i $ext }
  backtick -E inode { stat -Lc %d:%i $devname }
  test $inode = $extinode
}

if { ln -s $devname ext }
/etc/mdev/listen ext