mounts.sh

#!/bin/bash
export DEVICE="${DEVICE:-/dev/sdb1}"
export GENTOO="${GENTOO:-/mnt/gentoo}"
export MKFS="mkfs.xfs"
export URI="http://gentoo.osuosl.org/releases/amd64/autobuilds/current-install-amd64-minimal/stage3-amd64-20141204.tar.bz2"
export portage=1
HELP() {
	cat << EOF
Usage: $0 [options]
    Will setup/destroy ${GENTOO} for you automatically

Options:
    -i   init: ${MKFS} ${DEVICE}
    -f   fresh: unpack tarball from preconfigured URI (implies --init)
    -m   mount: auto-called from -i, -f
    -n   noinit: disable --init for --fresh
    -U   URI: sets the URI to use for curl
    -u   unmount: umount ${GENTOO} children and ${GENTOO}
EOF
}
[[ $# -eq 0 ]] && HELP
while getopts fhimnuU: opt; do
	case "${opt}" in
	i)	export init=1;;
	f)	export fresh=1;;
	m)	export mount=1;;
	n)	export noinit=1;;
	U)	echo "note: you must provide other options for -U to take effect"
		export URI=${OPTARG};;
	u)	export umount=1;;
	\?|h)
		HELP
		exit 2;;
	esac
done

_fancy_mount() {
	if mount | grep ${GENTOO} > /dev/null 2>&1 ; then
		mount | grep ${GENTOO} | awk {'printf "%-10s %-20s type: %s\n", $1,$3,$5'}
	else
		return 1
	fi
}

_do_unmount() {
	_fancy_mount && (
	echo "Unmounting ${DEVICE} from ${GENTOO}"
	mount | grep ${GENTOO}/ | awk {'print $3'} | sort -R | while read a; do umount $a || umount -lf $a;done
	mount | grep ${GENTOO}/ | awk {'print $3'} | sort -R | while read a; do umount $a || umount -lf $a;done
	umount ${GENTOO})
}

_pre_mount() {
	mount | grep ${GENTOO} > /dev/null 2>&1 && _do_unmount > /dev/null 2>&1
	mount ${DEVICE} ${GENTOO}
}

if [[ "${noinit}" -gt 0 ]]; then
	echo "Disabling -i (init)"
	export init=0
fi
if [[ "${init}" -gt 0 ]]; then
	export mount=1 fresh=1
	echo "Running ${MKFS}..."
	_do_unmount > /dev/null 2>&1
	${MKFS} -f ${DEVICE}
fi
if [[ "${mount}" -gt 0 ]]; then
	echo "Mounting ${DEVICE} to ${GENTOO}"
	_pre_mount
fi
if [[ "${fresh}" -gt 0 ]]; then
	echo "Unpacking ${URI} to ${GENTOO}"
	pushd ${GENTOO} > /dev/null
	curl ${URI} | pbzip2 -dc | tar x
	popd
fi
if [[ "${mount}" -gt 0 ]]; then
	echo "Final mounting of ${DEVICE} to ${GENTOO}"
	_pre_mount &&
	mount -t proc proc ${GENTOO}/proc &&
	for i in sys dev; do mount --rbind /${i} ${GENTOO}/${i} ; mount --make-rslave ${GENTOO}/${i};done &&
	[[ -h ${GENTOO}/dev/shm ]] && rm ${GENTOO}/dev/shm ; export shm=1
	[[ -d ${GENTOO}/dev/shm ]] && mount | grep ${GENTOO}/dev/shm > /dev/null 2>&1 || export shm=1
	[[ -e ${GENTOO}/dev/shm ]] || mkdir -p ${GENTOO}/dev/shm && export shm=1
	if [[ "${shm}" -gt 0 ]]; then
		mount -t tmpfs none ${GENTOO}/dev/shm
	fi
	if [[ "${portage}" -gt 0 ]]; then
		mount -t tmpfs none ${GENTOO}/usr/portage
	fi
	echo "Mounts:"
	_fancy_mount
fi
if [[ "${umount}" -gt 0 ]];then
	_do_unmount
fi

unset DEVICE GENTOO URI fresh init mount noinit portage shm umount
# vim: set ft=sh sw=4 ts=4 sts=4 :#