New package: vgm (#17741)

* [vgm] new package Virtual Geometry Model (VGM)

* [vgm] Updated description

var/spack/repos/builtin/packages/vgm/package.py

+# Copyright 2013-2020 Lawrence Livermore National Security, LLC and other
+# Spack Project Developers. See the top-level COPYRIGHT file for details.
+#
+# SPDX-License-Identifier: (Apache-2.0 OR MIT)
+
+from spack import *
+
+
+class Vgm(CMakePackage):
+    """Virtual Geometry Model (VGM) is a geometry conversion tool, actually
+    providing conversion between Geant4 and ROOT TGeo geometry models."""
+
+    homepage = "http://github.com/vmc-project/vgm"
+    url      = "http://github.com/vmc-project/vgm/archive/v4-8.tar.gz"
+    git      = "http://github.com/vmc-project/vgm.git"
+
+    maintainer = ['wdconinc']
+
+    version('master', branch='master')
+    version('4-8',    sha256='4fcd607b4f100fc00a65fec7a5803575daf9d4919d1808bbd6a30be263c001dd')
+    version('4-7',    sha256='a5f5588db457dc3e6562d1f7da1707960304560fbb0a261559fa3f112a476aea')
+    version('4-6',    sha256='6bf0aeef38f357a313e376090b45d3e0713ef9e52ca198075fae8579b8d5a23a')
+    version('4-5',    sha256='dc61c6214fdf592dfaa3766eed83cf2bbeabb1755f5146a6d3bcfe55ddbe428f')
+    version('4-4',    sha256='a915ff3500daa99b74ce9039fbd8abcbd08051e838a1b337e1d794b73537b33b')
+    version('4-3',    sha256='5cc892a263be2e179a5c2d712c50d7698af7d05d01dfed59c1e36840965f0c4e')
+    version('4-2',    sha256='25e183f2744fcd4c9995f52865c3f2bf415c7ce0504cfa44093a5f1846a4624f')
+    version('4-01',   sha256='43020f6497f18086c50e263555c2a21c6cfbba3044b1330c6f400357f040bbb1')
+    version('4-00',   sha256='c24de76f919dca7c92b3c9fce7a39142c6e61fd39f691d2e4df15fe413b5190d')
+    version('3-06',   sha256='41948869f2e4dcfa31f4bad42b938c25dd174660c427feb2f9effa9af5e59c7d')
+
+    depends_on('cmake@3.8:', type='build')
+    depends_on('clhep')
+    depends_on('root')
+    depends_on('geant4')
+
+    def cmake_args(self):
+        args = []
+
+        args.append('-DROOT_DIR={0}'.format(
+            self.spec['root'].prefix))
+        args.append('-DGeant4_DIR={0}'.format(
+            self.spec['geant4'].prefix))
+        args.append('-DCLHEP_LIB_DIR={0}'.format(
+            self.spec['clhep'].prefix.lib))
+        args.append('-DCLHEP_INC_DIR={0}'.format(
+            self.spec['clhep'].prefix.include))
+        args.append('-DWITH_TEST=OFF')
+
+        return args