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Re: Unset array doesn't work


From: Nikolai Kondrashov
Subject: Re: Unset array doesn't work
Date: Mon, 12 Feb 2018 08:41:34 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0

Hi Chet,

On 02/12/2018 01:31 AM, Chet Ramey wrote:
On 2/11/18 1:06 PM, Nikolai Kondrashov wrote:
Hi everyone,

I think I'm hitting a bug in Bash 4.4.12 (on Debian Stable): at some point
an "unset" of a global array variable doesn't work inside a function, in
"dkms" script from DKMS package. Adding another "unset" of the same variable
next to it fixes the issue.

Do you have a local variable with the same name "shadowing" the global?

Thank you for the quick response!

Looking more into this, the variable in question is defined as a local in the
calling function and is being "unset" in a function called from that one.

I think this is what's happening and seems to reproduce the issue:

    #!/bin/bash

    inner() {
        unset res
        if [[ $1 == "set" ]]; then
            res[0]="X"
            res[1]="Y"
        fi
    }

    outer() {
        local res=
        inner "$1"
        echo "res: address@hidden"
    }

    outer set
    outer dontset

The produced output is this:

    res: X Y
    res: X Y

The expected output is this:

    res: X Y
    res:

Sorry, if this is not minimal enough. Had little time to whittle it down.

This seems to me rather a gray area, and I wouldn't be too surprised if this
was by design, but it does feel wrong.

Thank you.

Nick



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