Merge pull request #8146 from rmarchei/8102

fix get_distribution_version() on amazon linux

lib/ansible/module_utils/basic.py

@@ -185,6 +185,8 @@ def get_distribution_version():
     if platform.system() == 'Linux':
         try:
             distribution_version = platform.linux_distribution()[1]
+            if not distribution_version and os.path.isfile('/etc/system-release'):
+                distribution_version = platform.linux_distribution(supported_dists=['system'])[1]
         except:
             # FIXME: MethodMissing, I assume?
             distribution_version = platform.dist()[1]

library/system/hostname

@@ -299,7 +299,8 @@ class RedHat5Hostname(Hostname):
 class RedHatServerHostname(Hostname):
     platform = 'Linux'
     distribution = 'Red hat enterprise linux server'
-    if LooseVersion(get_distribution_version()) >= LooseVersion("7"):
+    distribution_version = get_distribution_version()
+    if distribution_version and LooseVersion(distribution_version) >= LooseVersion("7"):
         strategy_class = FedoraStrategy
     else:
         strategy_class = RedHatStrategy
@@ -307,7 +308,8 @@ class RedHatServerHostname(Hostname):
 class RedHatWorkstationHostname(Hostname):
     platform = 'Linux'
     distribution = 'Red hat enterprise linux workstation'
-    if LooseVersion(get_distribution_version()) >= LooseVersion("7"):
+    distribution_version = get_distribution_version()
+    if distribution_version and LooseVersion(distribution_version) >= LooseVersion("7"):
         strategy_class = FedoraStrategy
     else:
         strategy_class = RedHatStrategy