Wrapper to debootstrap and chroot

0 debootstrap chroot.md

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do-bootstrap-chroot.sh

#!/usr/bin/env bash
TARGET=${1:-/mnt}
TARGET=`readlink -f ${TARGET}`
DIST=${2:-buster}
MIRROR=${3:-http://cdn-fastly.deb.debian.org/debian}

if ! [ -d ${TARGET} ]; then
  echo "Cannot locate TARGET=${TARGET}. Bailing." >&2
  exit 1
fi

if [ `find ${TARGET} | grep -v 'lost+found' | wc -l` -gt 1 ]; then
  echo "TARGET=${TARGET} is not empty. Skipping debootstrap step." >&2
else
  debootstrap --components=main,contrib,non-free buster ${TARGET} ${MIRROR}
fi

if ! ( curl -Is ${MIRROR}/dists/${DIST}/InRelease >/dev/null ); then
  echo "InRelease file for DIST=${DIST} is not found at MIRROR=${MIRROR}" >&2
  exit 1
fi

echo "Entering a shell so that you can mount the appropriate filesystems inside TARGET=${TARGET}" >&2
echo "Exit the shell with a failure (exit 1) to halt this script" >&2

PS1='(debootstrap) $(whoami)@$(hostname):$(pwd)$([ $(whoami) = "root" ] && echo "#" || echo "\$") ' sh -CfV
if [ "$?" -gt 0 ]; then
  echo "Received exit code. Bailing." >&2
  exit 1
fi

mount | grep "on ${TARGET}/dev"  || mount --verbose --rbind  /dev ${TARGET}/dev
mount | grep "on ${TARGET}/sys"  || mount --verbose -t sysfs none ${TARGET}/sys
mount | grep "on ${TARGET}/proc" || mount --verbose -t proc  none ${TARGET}/proc

cp -vf /etc/resolv.conf ${TARGET}/etc/resolv.conf

/usr/bin/env -i LANG=C HOME=/root TERM=${TERM} PS1="(chroot ${TARGET}) \\u@\\h:\\w# " `which chroot` ${TARGET} /bin/bash --noprofile --login