pbuilder hook to access shell on FTBFS

C10shell

#!/bin/bash
# example file to be used with --hookdir
#
# invoke shell if build fails.
echo "=== BUILD FAILED"
read -r -p "=== Do you want to enter shell and investigate situation? (Y/n) " res < /dev/tty > /dev/tty 2> /dev/tty

if [[ ${res,,} =~ ^(yes|y|)$ ]]; then
    BUILDDIR="${BUILDDIR:-/tmp/buildd}"
    apt-get install -y "${APTGETOPT[@]}" vim-nox less
    cd "$BUILDDIR"/*/debian/..
    /bin/bash < /dev/tty > /dev/tty 2> /dev/tty
fi