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Issue with which package adding strange environment variable

From: Nathan Hamilton
Subject: Issue with which package adding strange environment variable
Date: Tue, 10 Oct 2023 16:08:52 +0000


Our company is using  Amazon Linux 2023 as the base image for the dockerfile of several of our applications and it natively includes the package which​ according to the documentation the Amazon has provided: https://docs.aws.amazon.com/linux/al2023/release-notes/all-packages-AL2023.2.html

However, when our applications load, we get a strange readout of an unrecognized environment variable. When I run the shell command printenv​ I get the following in the readout:

BASH_FUNC_which%%=() {  ( alias;
 eval ${which_declare} ) | /usr/bin/which --tty-only --read-alias --read-functions --show-tilde --show-dot "$@"

I searched through the applications source files to see where this was getting set and I found this was being set in /etc/profile.d/which2.sh​. Here's the contents of this file:

[app@7b4e2c1bf547 app]$ cat /etc/profile.d/which2.sh
# shellcheck shell=sh
# Initialization script for bash, sh, mksh and ksh

which_declare="declare -f"
which_shell="$(cat /proc/$$/comm)"

if [ "$which_shell" = "ksh" ] || [ "$which_shell" = "mksh" ] || [ "$which_shell" = "zsh" ] ; then
  which_declare="typeset -f"

which ()
(alias; eval ${which_declare}) | /usr/bin/which --tty-only --read-alias --read-functions --show-tilde --show-dot "$@"

export which_declare
export ${which_opt} which

Here is the version of the which package that amazonlinux:2023 is providing:
[app@7b4e2c1bf547 app]$ which -v
GNU which v2.21, Copyright (C) 1999 - 2015 Carlo Wood.
This program is free software; your freedom to use, change
and distribute this program is protected by the GPL.

Thankfully this is not affecting our applications operation at all, but it produces confusing output that leads to a lack of understanding of what's transpiring. Could you point me to a way this could be resolved? Thanks!

For Christ's Glory

Nathan Hamilton
Software Engineer

Lumerit / AP / Global Enabling Functions
San Antonio, TX
M (210) 436-9097
Learn more at pearson.com

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