bash script environment/result ambiguity

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                          I'm running Arch Linux with i3wm.

    $ uname -a
    Linux lappie 5.3.1-arch1-1-ARCH #1 SMP PREEMPT Sat Sep 21 11:33:49 UTC 2019 x86_64 GNU/Linux
    $ i3 --version
    i3 version 4.17.1 (2019-08-30) © 2009 Michael Stapelberg and contributors

I have this scriptfile function.sh that scans the wifi with wpa_cli. It checks the return of > scan and returns the results if the scan was successful.

    #!/bin/bash
    
    logfile=/$HOME/.logfile
    
    echo "function" >> $logfile
    echo "" >> $logfile
    
    interface="wlp2s0"
    
    function scan_wifi {
    
    
    	scan=$(sudo wpa_cli -i $interface scan)
    	echo "scan: $scan" >> $logfile
    
    		case "$scan" in
    		"OK")
    			echo "Scanning wifi" >> $logfile
    			scan_res=$(sudo wpa_cli -i $interface scan_results | awk 'NR>1 {OFS="\n>>"; print $NF}')
    			echo "results: $scan_res" >> $logfile
    			echo $scan_res
    			;;
    		"FAIL")
    			echo "FAILED TO SCAN" >> $logfile
    			echo "FAILED TO SCAN"
    			;;
    		*)
    			echo "ERROR: empty or undefined event for $interface" >> $logfile
    			exit 1
    			;;
    	esac
    
    }
    
    echo "return: $(scan_wifi)" >> $logfile
    echo "" >> $logfile
    echo "" >> $logfile

function.sh locates in my $HOME directory. I also have a file /usr/local/bin/networkmenu containing the following:

    #!/bin/sh
    
    bash /home/speklap/function.sh


Until now everything is ok. I've added the /user/local/bin/networkmenu to the sudoers file to execute without password.

    speklap ALL=(ALL) NOPASSWD: /usr/local/bin/networkmenu

In the terminal as user:

    $ networkmenu

.logfile:

    function
    
    scan: OK
    Scanning wifi
    results: thuis
    return: thuis

But when executing with a shortcut through i3, it doesn't work.

.config/i3/config:

    bindsym $mod+n exec networkmenu

Results in a .logfile:

    function
    
    scan: 
    ERROR: empty or undefined event for wlp2s0
    return: 


Why is that, why can't i3 invoke the script like I can in the terminal? What am I doing wrong?


EDIT: if someone can come up with a better title, feel free to change. I had no clue on how to google this and my results were poorly and a lot of false positives

EDIT: outputting to /tmp/nm.log as per comment of @cas

    + logfile=//home/speklap/.logfile
    + echo functions
    + echo ''
    + interface=wlp2s0
    ++ scan_wifi
    +++ sudo wpa_cli -i wlp2s0 scan
    sudo: no tty present and no askpass program specified
    ++ scan=
    ++ echo 'scan: '
    ++ case "$scan" in
    ++ echo 'ERROR: empty or undefined event for wlp2s0'
    ++ exit 1
    + echo 'return: '
    + echo ''
    + echo ''

So now we know what the problem is, sudo: no tty present and no askpass program specified
I can fix this by adding wpa_cli to the sudoers file? Or is there a better solution. As in changing networkmenu to sudo bash /$HOME/function.sh?
                        
Asked by Swedgin (113 rep)
Oct 4, 2019, 08:09 PM
Last activity: Oct 5, 2019, 01:24 PM
bash script environment/result ambiguity

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