[Solved] Perform as root commands in /usr/local/bin

Mr. Alex · 2015-09-12 13:08:52

Hello! In continuation of https://bbs.archlinux.org/viewtopic.php?id=202016 : I have "poweroff" file in /usr/local/bin with contents:

#!/bin/bash

if grep -qs 'mapper' /etc/mtab
then
    echo 'TrueCrypt volume is mounted!'
else
    hwclock --utc -w
    systemctl poweroff
fi

The problem is that "hwclock" program doesn't do its task because it needs root permissions to run. But the file itself has root owner and root group. And I also did "chmod +s" for that file. Still hwclock complains that I am not root and thus cannot perform this operation. AFAIK it should be done. As root. Where is my mistake?

Last edited by Mr. Alex (2015-09-12 15:09:24)

brebs · 2015-09-12 13:13:03

See suid not allowed on BASH scripts.

Chazza · 2015-09-12 13:20:57

I think you might be able to accomplish this with sudo. Use visudo to add something like the following to /etc/sudoers:

username  ALL=(ALL) NOPASSWD:  hwclock

The call sudo hwclock from your script.

Last edited by Chazza (2015-09-12 13:22:30)

Mr. Alex · 2015-09-12 13:23:51

So there's no simple way of configuring the system to allow what I want to do?

Mr. Alex · 2015-09-12 13:24:41

Chazza, got your reply after my post #4. I'll try to do it now.

Mr. Alex · 2015-09-12 13:32:13

My line for sudoers is now

alex   ALL=(ALL) NOPASSWD:hwclock

and it doesn't work:

sudo: parse error in /etc/sudoers near line 1

Can't figure out why. Everything looks correct.

Chazza · 2015-09-12 13:39:43

Just figured it out. It wants the full path to hwclock.

Arch Linux

#1 2015-09-12 13:08:52

[Solved] Perform as root commands in /usr/local/bin

#2 2015-09-12 13:13:03

Re: [Solved] Perform as root commands in /usr/local/bin

#3 2015-09-12 13:20:57

Re: [Solved] Perform as root commands in /usr/local/bin

#4 2015-09-12 13:23:51

Re: [Solved] Perform as root commands in /usr/local/bin

#5 2015-09-12 13:24:41

Re: [Solved] Perform as root commands in /usr/local/bin

#6 2015-09-12 13:32:13

Re: [Solved] Perform as root commands in /usr/local/bin

#7 2015-09-12 13:39:43

Re: [Solved] Perform as root commands in /usr/local/bin

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