From 2474b9107811664f576031f6deed59533889ecd5 Mon Sep 17 00:00:00 2001
From: Christoph Conrads <22275833+christoph-conrads@users.noreply.github.com>
Date: Fri, 20 Aug 2021 14:54:43 +0200
Subject: file: make package discoverable (#25479)

---
 var/spack/repos/builtin/packages/file/package.py | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/var/spack/repos/builtin/packages/file/package.py b/var/spack/repos/builtin/packages/file/package.py
index 582c15cf62..13d1b59ec1 100644
--- a/var/spack/repos/builtin/packages/file/package.py
+++ b/var/spack/repos/builtin/packages/file/package.py
@@ -2,6 +2,9 @@
 # Spack Project Developers. See the top-level COPYRIGHT file for details.
 #
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
+
+import re
+
 from spack import *
 
 
@@ -16,3 +19,11 @@ class File(AutotoolsPackage):
     version('5.39', sha256='f05d286a76d9556243d0cb05814929c2ecf3a5ba07963f8f70bfaaa70517fad1')
     version('5.38', sha256='593c2ffc2ab349c5aea0f55fedfe4d681737b6b62376a9b3ad1e77b2cc19fa34')
     version('5.37', sha256='e9c13967f7dd339a3c241b7710ba093560b9a33013491318e88e6b8b57bae07f')
+
+    executables = ['^file$']
+
+    @classmethod
+    def determine_version(cls, exe):
+        output = Executable(exe)('--version', output=str, error=str)
+        match = re.search(r'file-(\S+)', output)
+        return match.group(1) if match else None
-- 
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