Ansible galaxy role download should not have to perform aditionnal check against tar archive file extension #56616. (#56617)

Ansible galaxy role download checked for `.tar.gz`, but `tarfile.is_tarfile(...)` can identify and open any valid tarfile. This change uses transparent stream compression to make `.tar.gz` and `.tar.bz2` formats valid with python 2.6.x/2.7.x (as well as `.tar.xz` with python 3.x).

docs/docsite/rst/reference_appendices/galaxy.rst

@@ -120,7 +120,15 @@ Use the following example as a guide for specifying roles in *requirements.yml*:
 
     # from a webserver, where the role is packaged in a tar.gz
     - src: https://some.webserver.example.com/files/master.tar.gz
-      name: http-role
+      name: http-role-gz
+
+    # from a webserver, where the role is packaged in a tar.bz2
+    - src: https://some.webserver.example.com/files/master.tar.bz2
+      name: http-role-bz2
+
+    # from a webserver, where the role is packaged in a tar.xz (Python 3.x only)
+    - src: https://some.webserver.example.com/files/master.tar.xz
+      name: http-role-xz
 
     # from Bitbucket
     - src: git+https://bitbucket.org/willthames/git-ansible-galaxy

lib/ansible/cli/galaxy.py

@@ -319,7 +319,7 @@ class GalaxyCLI(CLI):
     def execute_install(self):
         """
         uses the args list of roles to be installed, unless -f was specified. The list of roles
-        can be a name (which will be downloaded via the galaxy API and github), or it can be a local .tar.gz file.
+        can be a name (which will be downloaded via the galaxy API and github), or it can be a local tar archive file.
         """
         role_file = context.CLIARGS['role_file']
 

lib/ansible/galaxy/role.py

@@ -256,12 +256,9 @@ class GalaxyRole(object):
             display.debug("installing from %s" % tmp_file)
 
             if not tarfile.is_tarfile(tmp_file):
-                raise AnsibleError("the file downloaded was not a tar.gz")
+                raise AnsibleError("the downloaded file does not appear to be a valid tar archive.")
             else:
-                if tmp_file.endswith('.gz'):
-                    role_tar_file = tarfile.open(tmp_file, "r:gz")
-                else:
-                    role_tar_file = tarfile.open(tmp_file, "r")
+                role_tar_file = tarfile.open(tmp_file, "r")
                 # verify the role's meta file
                 meta_file = None
                 members = role_tar_file.getmembers()