Bug#1039588: cfengine3: mpf 3.21 might fail to find python interpreter used for apt-get package module

[Valentin Kleibel]

Package: cfengine3
Version: 3.21.0-2

Dear Maintainer,
In the shipped masterfiles in cfe_internal/update/update_policy.cf 
cfengine does its own search for a python executeable in $PATH to create 
a symlink with its preferred interpreter.
But $(sys.bindir) is excluded from the search and therefor cfengine will 
fail to find /usr/bin/python3 or other python interpreters residing in 
/usr/bin.
In turn package promises will fail as they are based on python.

The issue was reported upstream: 
https://github.com/cfengine/masterfiles/pull/2665

A patch to fix this behaviour is attached.

Best regards,
Valentindiff --git a/cfe_internal/update/update_policy.cf b/cfe_internal/update/update_policy.cf
index e71532b4..bba105da 100644
--- cfe_internal/update/update_policy.cf
+++ cfe_internal/update/update_policy.cf
@@ -90,9 +90,7 @@ bundle agent cfe_internal_setup_python_symlink(symlink_path)
 {
   vars:
       "path" string => getenv("PATH", 1024);
-      "path_folders" slist => filter("$(sys.bindir)",
-                                     splitstring("$(path)", ":", 128),
-                                     false, true, 128);
+      "path_folders" slist => splitstring("$(path)", ":", 128);
 
     windows::
       "abs_path_folders" -> {"CFE-2309"}