chroot-style/uchroot: add -t parameter to command.

[ericonr]

Without it, using xbps-src with overlay errors out with the message
below:

ERROR: failed to mount overlayfs on
/home/ericonr/void/void-packages/masterdir.XXXXdMemKO/masterdir (Invalid
argument)

---

I don't know if I'm the only one seeing this.

[q66]

overlayfs is not supported on zfs

[pullmoll]

Perhaps chroot-style/uchroot can check the mount point's filesystem and error out if with an explicit message.
Some lines using findmnt from util-linux can be used to tell a path's file system:

#!/bin/bash
path=$PWD
while [ -z "$FSTYPE" -a ! -z "$path" ]; do
	eval $(findmnt -P "$path")
	path="${path%/*}"
done
echo "$FSTYPE"

[ericonr]

@pullmoll perhaps to avoid adding complexity to the script itself, we could add a message that -t might not work on all filesystems...

[pullmoll]

@ericonr Agree.