From 8243009d062c0df136b6eb8186109525bb51398c Mon Sep 17 00:00:00 2001
From: Osama Albahrani <54853250+osalbahr@users.noreply.github.com>
Date: Sat, 29 Jul 2023 00:41:13 -0400
Subject: [PATCH] config: fallback to ::OS_VERSION

In Linux systems where lsb_release is not available by default,
`brew config` now falls back to `PRETTY_NAME` (`HOMEBREW_OS_VERSION`).

Before:
```console
$ brew config
HOMEBREW_VERSION: 4.1.2-30-gc346a5c
ORIGIN: https://github.com/Homebrew/brew
HEAD: c346a5c97adef16fcc439b53cc6e757b64b71cb4
Last commit: 14 hours ago
Core tap JSON: 29 Jul 04:16 UTC
HOMEBREW_PREFIX: /home/linuxbrew/.linuxbrew
HOMEBREW_CASK_OPTS: []
HOMEBREW_DISPLAY: :0
HOMEBREW_EDITOR: /usr/bin/nano
HOMEBREW_EVAL_ALL: set
HOMEBREW_MAKE_JOBS: 4
Homebrew Ruby: 2.6.10 => /home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/vendor/portable-ruby/2.6.10_1/bin/ruby
CPU: quad-core 64-bit skylake
Clang: N/A
Git: 2.41.0 => /bin/git
Curl: 8.2.1 => /bin/curl
Kernel: Linux 6.4.4-200.fc38.x86_64 x86_64 GNU/Linux
OS: Unknown
Host glibc: 2.37
/usr/bin/gcc: 13.1.1
/usr/bin/ruby: N/A
glibc: N/A
gcc@11: N/A
gcc: N/A
xorg: N/A
```

After:
```console
$ brew config
HOMEBREW_VERSION: 4.1.2-30-gc346a5c-dirty
ORIGIN: https://github.com/Homebrew/brew
HEAD: c346a5c97adef16fcc439b53cc6e757b64b71cb4
Last commit: 14 hours ago
Core tap JSON: 29 Jul 04:37 UTC
HOMEBREW_PREFIX: /home/linuxbrew/.linuxbrew
HOMEBREW_CASK_OPTS: []
HOMEBREW_DISPLAY: :0
HOMEBREW_EDITOR: /usr/bin/nano
HOMEBREW_EVAL_ALL: set
HOMEBREW_MAKE_JOBS: 4
Homebrew Ruby: 2.6.10 => /home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/vendor/portable-ruby/2.6.10_1/bin/ruby
CPU: quad-core 64-bit skylake
Clang: N/A
Git: 2.41.0 => /bin/git
Curl: 8.2.1 => /bin/curl
Kernel: Linux 6.4.4-200.fc38.x86_64 x86_64 GNU/Linux
OS: Arch Linux
Host glibc: 2.37
/usr/bin/gcc: 13.1.1
/usr/bin/ruby: N/A
glibc: N/A
gcc@11: N/A
gcc: N/A
xorg: N/A
```
---
 Library/Homebrew/os/linux.rb | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Library/Homebrew/os/linux.rb b/Library/Homebrew/os/linux.rb
index 709dd2d57e..42b03057db 100644
--- a/Library/Homebrew/os/linux.rb
+++ b/Library/Homebrew/os/linux.rb
@@ -19,6 +19,8 @@ module OS
         end
       elsif (redhat_release = Pathname.new("/etc/redhat-release")).readable?
         redhat_release.read.chomp
+      elsif ::OS_VERSION and ! ::OS_VERSION.empty?
+        ::OS_VERSION
       else
         "Unknown"
       end