nfsroot-setup.sh

#! @shell@

echo
echo -e "\e[1;32m<<< NixOS root-overlay >>>\e[0m"
echo

stage1Init="@bootStage1@"
echo "stage-1-script: $stage1Init"

setPath() {
    local dirs="$1"
    export PATH=/empty
    for i in $dirs; do
        PATH=$PATH:$i/bin
        if test -e $i/sbin; then
            PATH=$PATH:$i/sbin
        fi
    done
}

fail() {
  echo "entering shell..."
  setsid @shell@ -c "exec @shell@"
}

setPath "@path@"

modprobe overlay

targetRoot=/overlay

mount -n -t tmpfs overlay-tmp /overlayfs
mkdir /overlayfs/oldroot
mkdir /overlayfs/rw
mount -t tmpfs overlay-rw-tmp /overlayfs/rw
mkdir /overlayfs/rw/upper
mkdir /overlayfs/rw/work
mount --bind / /overlayfs/oldroot
mount -n -t overlay -o lowerdir=/overlayfs/oldroot,upperdir=/overlayfs/rw/upper,workdir=/overlayfs/rw/work overlay-root $targetRoot

cd $targetRoot
mkdir oldroot
pivot_root . oldroot
exec chroot . "$stage1Init"
fail