Use the proper python interpretor for yum-dump.py on Fedora 21+

Fedora 21+ use dnf as the primary package manager.  Lamont added code in
12.5 to allow for a yum compat mode. This doesn't entirely work though
as we need yum-dump.py to correctly run.  We were parsing the shabang in
the yum binary to find the path to python.  On a dnf system the yum
binary is a bash script though so we were trying to run yum-dump.py
using bash which obviously fails.  I added a fallback method to use
python if the shebang parsing returns bash. With this in place AND the
yum package installed you can use the package resource on Fedora.

1 files changed, 6 insertions, 0 deletions

diff --git a/spec/unit/provider/package/yum_spec.rb b/spec/unit/provider/package/yum_spec.rb
index 3fc0b807c9..b37a675bf2 100644
--- a/spec/unit/provider/package/yum_spec.rb
+++ b/spec/unit/provider/package/yum_spec.rb
@@ -1844,6 +1844,12 @@ EOF
       expect(@yc.python_bin).to eq("/usr/bin/python")
     end
 
+    it "should return /usr/bin/python if the interpreter is /bin/bash" do
+      other = StringIO.new("#!/bin/bash\n# The yum executable redirecting to dnf from dnf-yum compatible package.")
+      allow(::File).to receive(:open).with("/usr/bin/yum", "r") { |&b| r = b.call(other); other.rewind; r}
+      expect(@yc.python_bin).to eq("/usr/bin/python")
+    end
+
     it "should return the interpreter for yum" do
       other = StringIO.new("#!/usr/bin/super_python\n\nlasjdfdsaljf\nlasdjfs")
       allow(::File).to receive(:open).with("/usr/bin/yum", "r") { |&b| r = b.call(other); other.rewind; r}