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From: Lars Schneider <larsxschneider@gmail.com>
Newsgroups: gnu.bash.bug
Subject: Re: exec/read -s bug?
Date: Sun, 19 Aug 2018 21:12:07 +0200
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Approved: bug-bash@gnu.org
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> On Aug 19, 2018, at 8:45 PM, Lars Schneider <larsxschneider@gmail.com> =
wrote:
>=20
>=20
>> On Aug 19, 2018, at 6:33 PM, Lars Schneider =
<larsxschneider@gmail.com> wrote:
>>=20
>> Hi,
>>=20
>> consider this script:
>>=20
>> 	#!/bin/bash
>> 	[ "`whoami`" =3D "root" ] || {
>> 	  exec sudo -u root "$0" "$@"
>> 	}
>> 	read -s -p "enter stuff: " stuff
>>=20
>> If I run the script as normal user (not root!) and I abort the "read =
-s -p"
>> call with "ctrl-c", then my shell is still in silent mode.
>>=20
>> I can consitently replicate that behavior on Ubuntu 14.04.5 LTS =
(Trusty)=20
>> and BASH 4.3.11(1)-release (x86_64-pc-linux-gnu) as well as BASH =
4.3.30.
>>=20
>> I also installed BASH 4.4.18 from source and I can replicate the =
issue.
>=20
> I did a mistake: The problem _was_ fixed with BASH 4.4.18.
> Further testing revealed that it is fixed with 4.4. too but not in =
Bash-4.3 patch 46.
>=20
> I think the following item in the release notes corresponds to the =
problem:
>=20
> oo. Fixed a bug that caused bash to not clean up readline's state, =
including
>     the terminal settings, if it received a fatal signal while in a =
readline()
>     call (including `read -e' and `read -s').
>=20
> Does anyone see a workaround to set the readline state properly
> for older BASH versions?

OK, I found a work around:

	[ "`whoami`" =3D "root" ] || {
	  exec sudo -u root "$0" "$@"
	}

	function finish {
	  stty echo echok
	}
	trap finish EXIT
	read -s -p "enter stuff: " stuff
	echo "answer: $stuff"

Cheers,
Lars=