I'm experimenting with this wrapper around pkg(8) to automatically mount the pkg cache in tmpfs and create a ZFS boot environment. The reason for using tmpfs is to prevent a eMMC/SSD from wearing. Any suggestions for improvements are welcome.
Code:
#!/bin/sh
#
# Wrapper around FreeBSD pkg(8) to create a ZFS Boot Environment
# and mount /var/cache/pkg in tmpfs before pkg install|upgrade
cmd=
opts=
while [ $# -gt 0 ] ; do
case "$1" in
-*)
opts="$opts $1"
shift ;;
*)
cmd="$1"
break ;;
esac
done
case "$cmd" in
install|upgrade)
shift ;;
*)
exec pkg $opts "$cmd" "$@" ;;
esac
size=$(pkg $opts "$cmd" -Fn "$@" | awk '/to be downloaded/ { printf "%s%c", $1 + 10, substr($2, 0, 1) }')
[ -z "$size" ] && exit 0
mount -v -t tmpfs -o size="$size" tmpfs /var/cache/pkg || exit 1
cleanup () {
umount -v /var/cache/pkg
exit "${1:-1}"
}
trap cleanup HUP QUIT INT
rootfs=$(mount -p | awk '$2 == "/" { print $3 }')
if [ "$rootfs" = "zfs" ] ; then
bectl create -r default@"$(date +'%Y-%m-%d_%H%M%S')"
fi
pkg $opts "$cmd" "$@"
cleanup $?
