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#!/bin/bash
die() { printf "%s: Error: %s\n" "$0" "$*" >&2; exit 1; }
whole_device()
{
case "$1" in
*-part?) false ;;
*-part??) false ;;
*-part???) false ;;
*/usb\*) false ;;
*) true ;;
esac
}
confirm_usb()
{
local msg="This will completely overwrite device:\n\n\t%s\n\nType 'yes' to confirm.\nContinue? "
printf "$msg" "$1" >&2
read line
case "$line" in
[yY][eE][sS]) return ;;
*) die "Aborted by user." ;;
esac
}
choose_usb()
{
local devs maj
set -- /dev/disk/by-id/usb*
for dev; do
shift
whole_device "$dev" || continue
set -- "$@" "$dev"
done
if [ $# = 0 ]; then
die "no usb device found"
elif [ $# = 1 ]; then
confirm_usb "$1" || die impossible
USB=$(readlink -f "$1")
else
die "multiple USB devices connected and choice between them is unimplemented. ($*)"
fi
}
choose_cdrom()
{
die 'choose_cdrom: unimplemented; specify cdrom device with --out'
}
choose_usb
echo $USB
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