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#!/bin/bash
die() { printf "%s: Error: %s\n" "$0" "$*" >&2; exit 1; }
ECHO() { printf "%s\n" "$*" >&2; }
PRINTF() { printf "$@" >&2; }
whole_device()
{
case "$1" in
*-part?) false ;;
*-part??) false ;;
*-part???) false ;;
*/usb\*) false ;;
*) true ;;
esac
}
confirm_usb_strict()
{
CONFIRM_MSG="This will completely overwrite device:\n\n\t%s\n\nType 'yes' to confirm.\nContinue? "
CONFIRM_WITH_ONE_LETTER=
confirm_helper "$@"
}
confirm_usb_lax()
{
CONFIRM_MSG="The device used will be:\n\n\t%s\n\nType 'y' to confirm.\nContinue? "
CONFIRM_WITH_ONE_LETTER=y
confirm_helper "$@"
}
confirm_helper()
{
PRINTF "$CONFIRM_MSG" "$1"
read line
case "$line" in
[yY][eE][sS]) return ;;
[yY]) [ "$CONFIRM_WITH_ONE_LETTER" ] && return || : ;;
esac
die "Aborted by user."
}
choose_usb()
{
local devs maj USB
set -- /dev/disk/by-id/usb*
for dev; do
shift
whole_device "$dev" || continue
set -- "$@" "$dev"
done
if [ $# = 0 ]; then
die "no USB storage device found"
elif [ $# = 1 ]; then
[ "$NO_ACT" ] && confirm=confirm_usb_lax || confirm=confirm_usb_strict
$confirm "$1" || exit
USB=$1
else
ECHO
PRINTF "%s\n" "The following candidate target devices have been found:"
i=0
for dev; do
i=$((i+1))
PRINTF "\n\n\t%2i. %s\n" $i "$dev"
done
PRINTF "%s\n\n" '' "Choose a device by its number, from 1 to $#, then press enter." "To abort, press CTRL-C."
PRINTF "\n%s" 'Your choice: '
read line
case "$line" in
[1-9]|[1-9][0-9])
[ $line -le $# -a $line -ge 1 ] || die "Invalid argument (out of range): $line"
USB=${!line}
;;
*) die "Invalid argument: $line" ;;
esac
confirm_usb_lax
fi
[ "$USB" ] && readlink -f "$USB"
}
NO_ACT=
case "$1" in
-n) NO_ACT=y;;
-*) exit 1;;
esac
choose_usb
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