Configure mount dir and windows drive letter

[philippe-granet]

First, thanks for your great work, last release with separate distro and iptables is awesome 🎉 !

At work, some PC have Windows system in an other drive than C:, exemple D:.
You can also configure directory where drives are mounted, in /etc/wsl.conf, see https://docs.microsoft.com/en-us/windows/wsl/wsl-config:

Section: [automount]
root (default: /mnt/): Sets the directory where fixed drives will be automatically mounted.
For example, if you have a directory in WSL at /windir/ and you specify that as the root, you would expect to see your fixed drives mounted at /windir/c

I think you use these code to find real values:
https://github.com/wslutilities/wslu/blob/173da54ec9b138c1c5d13dd24398ed1d114024f8/src/wslu-header#L111-L146

function interop_prefix {

	win_location="/mnt/"
	if [ -f /etc/wsl.conf ]; then
		tmp="$(awk -F '=' '/root/ {print $2}' /etc/wsl.conf | awk '{$1=$1;print}')"
		[ "$tmp" == "" ] || win_location="$tmp"
		[[ "$win_location" =~ ^.*/$ ]] || win_location="$win_location/" # make sure it always end with slash
		unset tmp
	fi
	echo "$win_location"

	unset win_location
}

function sysdrive_prefix {
	win_location="$(interop_prefix)"
	hard_reset=0
	for pt in $(ls "$win_location"); do
		if [ $(echo "$pt" | wc -l) -eq 1 ]; then
			if [ -d "$win_location$pt/Windows/System32" ]; then
				hard_reset=1
				win_location="$pt"
				break
			fi
		fi 
	done

	if [ $hard_reset -eq 0 ]; then
		win_location="c"
	fi

	echo "$win_location"

	unset win_location
	unset hard_reset
}

[sakai135]

@philippe-granet Can you try it with the changes in #40? You can get the updated distro from the build artifact here.

[philippe-granet]

@sakai135 I have tested with this build artifact and all is OK for me, it works as expected.
Thanks! 😃