utils_prog: getenv_namespaced for accessing CLUFTER_X env vars

Actually, the namespace is derived from the package name directly.

Signed-off-by: Jan Pokorný <jpokorny@redhat.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/utils_prog.py b/utils_prog.py
index b286220..82c4c69 100644
--- a/utils_prog.py
+++ b/utils_prog.py
@@ -16,6 +16,7 @@ from os.path import abspath, dirname, samefile, \
 from subprocess import Popen
 from sys import stderr, stdin
 
+from . import package_name
 from .error import ClufterError
 from .utils import areinstances, \
                    filterdict_pop, \
@@ -274,3 +275,8 @@ def defer_common(me, fnc, skip=0):
             return fnc(cmd_ctxt, **kwargs)
         wrapfnc.__doc__ = fnc.__doc__ + common.__doc__
     return fnc_defaults, fnc_varnames, wrapfnc
+
+
+def getenv_namespaced(varname, value=None, namespace=package_name().upper()):
+    """Obtain value of environment variable prefixed with `namespace + '_'`"""
+    return environ.get('_'.join((namespace, varname)), value)