Add buildah transport

Author: Jordan Webb

ansible_mitogen/connection.py

@@ -154,6 +154,20 @@ def _connect_ssh(spec):
         }
     }
 
+def _connect_buildah(spec):
+    """
+    Return ContextService arguments for a Buildah connection.
+    """
+    return {
+        'method': 'buildah',
+        'kwargs': {
+            'username': spec.remote_user(),
+            'container': spec.remote_addr(),
+            'python_path': spec.python_path(),
+            'connect_timeout': spec.ansible_ssh_timeout() or spec.timeout(),
+            'remote_name': get_remote_name(spec),
+        }
+    }
 
 def _connect_docker(spec):
     """
@@ -373,6 +387,7 @@ def _connect_mitogen_doas(spec):
 #: generating ContextService keyword arguments matching a connection
 #: specification.
 CONNECTION_METHOD = {
+    'buildah': _connect_buildah,
     'docker': _connect_docker,
     'kubectl': _connect_kubectl,
     'jail': _connect_jail,

ansible_mitogen/plugins/connection/mitogen_buildah.py

@@ -0,0 +1,44 @@
+# Copyright 2019, David Wilson
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#
+# 1. Redistributions of source code must retain the above copyright notice,
+# this list of conditions and the following disclaimer.
+#
+# 2. Redistributions in binary form must reproduce the above copyright notice,
+# this list of conditions and the following disclaimer in the documentation
+# and/or other materials provided with the distribution.
+#
+# 3. Neither the name of the copyright holder nor the names of its contributors
+# may be used to endorse or promote products derived from this software without
+# specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+
+from __future__ import absolute_import
+import os.path
+import sys
+
+try:
+    import ansible_mitogen
+except ImportError:
+    base_dir = os.path.dirname(__file__)
+    sys.path.insert(0, os.path.abspath(os.path.join(base_dir, '../../..')))
+    del base_dir
+
+import ansible_mitogen.connection
+
+
+class Connection(ansible_mitogen.connection.Connection):
+    transport = 'buildah'

ansible_mitogen/strategy.py

@@ -139,8 +139,8 @@ def wrap_connection_loader__get(name, *args, **kwargs):
     While the strategy is active, rewrite connection_loader.get() calls for
     some transports into requests for a compatible Mitogen transport.
     """
-    if name in ('docker', 'kubectl', 'jail', 'local', 'lxc',
-                'lxd', 'machinectl', 'setns', 'ssh'):
+    if name in ('buildah', 'docker', 'kubectl', 'jail', 'local',
+                'lxc', 'lxd', 'machinectl', 'setns', 'ssh'):
         name = 'mitogen_' + name
     return connection_loader__get(name, *args, **kwargs)
 

ansible_mitogen/transport_config.py

@@ -240,6 +240,12 @@ def mitogen_mask_remote_name(self):
         undesirable in some circumstances.
         """
 
+    @abc.abstractmethod
+    def mitogen_buildah_path(self):
+        """
+        The path to the "buildah" program for the 'buildah' transport.
+        """
+
     @abc.abstractmethod
     def mitogen_docker_path(self):
         """
@@ -424,6 +430,9 @@ def mitogen_kind(self):
     def mitogen_mask_remote_name(self):
         return self._connection.get_task_var('mitogen_mask_remote_name')
 
+    def mitogen_buildah_path(self):
+        return self._connection.get_task_var('mitogen_buildah_path')
+
     def mitogen_docker_path(self):
         return self._connection.get_task_var('mitogen_docker_path')
 
@@ -647,6 +656,9 @@ def mitogen_kind(self):
     def mitogen_mask_remote_name(self):
         return self._host_vars.get('mitogen_mask_remote_name')
 
+    def mitogen_buildah_path(self):
+        return self._host_vars.get('mitogen_buildah_path')
+
     def mitogen_docker_path(self):
         return self._host_vars.get('mitogen_docker_path')
 

mitogen/buildah.py

@@ -0,0 +1,73 @@
+# Copyright 2019, David Wilson
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#
+# 1. Redistributions of source code must retain the above copyright notice,
+# this list of conditions and the following disclaimer.
+#
+# 2. Redistributions in binary form must reproduce the above copyright notice,
+# this list of conditions and the following disclaimer in the documentation
+# and/or other materials provided with the distribution.
+#
+# 3. Neither the name of the copyright holder nor the names of its contributors
+# may be used to endorse or promote products derived from this software without
+# specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+
+# !mitogen: minify_safe
+
+import logging
+
+import mitogen.core
+import mitogen.parent
+
+
+LOG = logging.getLogger(__name__)
+
+
+class Stream(mitogen.parent.Stream):
+    child_is_immediate_subprocess = False
+
+    container = None
+    username = None
+    buildah_path = 'buildah'
+
+    # TODO: better way of capturing errors such as "No such container."
+    create_child_args = {
+        'merge_stdio': True
+    }
+
+    def construct(self, container=None,
+                  buildah_path=None, username=None,
+                  **kwargs):
+        assert container or image
+        super(Stream, self).construct(**kwargs)
+        if container:
+            self.container = container
+        if buildah_path:
+            self.buildah_path = buildah_path
+        if username:
+            self.username = username
+
+    def _get_name(self):
+        return u'buildah.' + self.container
+
+    def get_boot_command(self):
+        args = []
+        if self.username:
+            args += ['--user=' + self.username]
+        bits = [self.buildah_path, 'run'] + args + ['--', self.container]
+
+        return bits + super(Stream, self).get_boot_command()

mitogen/core.py

@@ -1089,6 +1089,7 @@ class Importer(object):
     # The Mitogen package is handled specially, since the child context must
     # construct it manually during startup.
     MITOGEN_PKG_CONTENT = [
+        'buildah',
         'compat',
         'debug',
         'doas',

mitogen/parent.py

@@ -2163,6 +2163,9 @@ def proxy_connect(self, via_context, method_name, name=None, **kwargs):
             self._write_lock.release()
         return context
 
+    def buildah(self, **kwargs):
+        return self.connect(u'buildah', **kwargs)
+
     def doas(self, **kwargs):
         return self.connect(u'doas', **kwargs)