Merge pull request #7 from BlueBrain/enh/likwid_setgid

Added setgid option for likwid

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

@@ -53,6 +53,12 @@ class Likwid(Package):
 
     depends_on('perl', type=('build', 'run'))
 
+    variant('setgid', default=False, description='enable setgid flag '
+            + 'for likwid-accessD and change its group to LIWKID_GROUP. '
+            + 'Note: set LIWKID_GROUP env variable')
+
+    conflicts('+setgid', when='@:4.0.1')  # accessD was added in 4.1
+
     supported_compilers = {'clang': 'CLANG', 'gcc': 'GCC', 'intel': 'ICC'}
 
     def patch(self):
@@ -109,3 +115,15 @@ def install(self, spec, prefix):
         env['PWD'] = os.getcwd()
         make()
         make('install')
+
+    @run_after('install')
+    def change_group(self):
+        accessD = join_path(self.prefix.sbin, 'likwid-accessD')
+        if self.spec.satisfies('+setgid'):
+            likwid_group = 'likwid'
+            if 'LIKWID_GROUP' in os.environ:
+                likwid_group = os.environ['LIKWID_GROUP']
+            chgrp = which('chgrp')
+            chmod = which('chmod')
+            chgrp(likwid_group, accessD)
+            chmod('g+s', accessD)