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[bug] Special parameters $PATH and $path aren't kept in sync after emulating sh

X-seq: zsh-workers 47527
From: Brice Waegeneire <brice@xxxxxxxxxxx>
To: zsh-workers@xxxxxxx
Subject: [bug] Special parameters $PATH and $path aren't kept in sync after emulating sh
Date: Mon, 09 Nov 2020 08:27:28 +0100
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Hello,

Yesterday I stumbled upon a bug where setting $PATH when emulating
sh would would break the variable synchronization between the string
($PATH) and the array ($path):
--8<---------------cut here---------------start------------->8---
$ echo $PATH
/gnu/store/j1jv0f6cs18s76jbkp8h7nbh1i7rwgz2-profile/bin:/home/bricewge/.zsh/polaris/sbin:/home/bricewge/.zsh/polaris/bin:/home/bricewge/.zsh/polaris/usr/sbin:/home/bricewge/.zsh/polaris/usr/bin:/home/bricewge/misc/go/bin:/home/bricewge/.emacs.d/bin:/home/bricewge/.local/bin:/run/setuid-programs:/home/bricewge/.config/guix/current/bin:/home/bricewge/.guix-profile/bin:/home/bricewge/.guix-profile/sbin:/run/current-system/profile/bin:/run/current-system/profile/sbin
$ echo $path

/gnu/store/j1jv0f6cs18s76jbkp8h7nbh1i7rwgz2-profile/bin/home/bricewge/.zsh/polaris/sbin /home/bricewge/.zsh/polaris/bin/home/bricewge/.zsh/polaris/usr/sbin /home/bricewge/.zsh/polaris/usr/bin/home/bricewge/misc/go/bin /home/bricewge/.emacs.d/bin/home/bricewge/.local/bin /run/setuid-programs/home/bricewge/.config/guix/current/bin /home/bricewge/.guix-profile/bin/home/bricewge/.guix-profile/sbin /run/current-system/profile/bin/run/current-system/profile/sbin

$ cat /tmp/test.sh
unset PATH
export PATH=/foo
$ emulate sh -c 'source /tmp/test.sh'
_direnv_hook:1: command not found: direnv
$ echo $PATH
/foo
$ echo $path

$ export PATH=bar:baz
$ echo $PATH
bar:baz
$ echo $path
--8<---------------cut here---------------end--------------->8---

In effect it overwride my path instead of adding a new entry to it
when I do it from the array variable ($path) after setting it from
from the string variable ($PATH). To workaround this issue I have
found the following to work:

--8<---------------cut here---------------start------------->8---
$ tmp="$PATH"
$ unset PATH
$ export PATH="$tmp"
$ unset tmp
--8<---------------cut here---------------end--------------->8---

Cheers,
- Brice

Follow-Ups:
- Re: [bug] Special parameters $PATH and $path aren't kept in sync after emulating sh
  - From: Daniel Shahaf
- Re: [bug] Special parameters $PATH and $path aren't kept in sync after emulating sh
  - From: Peter Stephenson

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