From 711967ae9639095ce41500bb0e6f80c8b80fab95 Mon Sep 17 00:00:00 2001
From: Stuart Mackie <wsmackie@juniper.net>
Date: Tue, 25 Jul 2017 10:37:57 -0700
Subject: Contrail charms

Change-Id: I2d259d03f63fce38348b8384e26ac23e3fce44a8
Signed-off-by: Stuart Mackie <wsmackie@juniper.net>
---
 .../hooks/charmhelpers/fetch/snap.py               | 122 +++++++++++++++++++++
 1 file changed, 122 insertions(+)
 create mode 100644 contrail-controller/hooks/charmhelpers/fetch/snap.py

(limited to 'contrail-controller/hooks/charmhelpers/fetch/snap.py')

diff --git a/contrail-controller/hooks/charmhelpers/fetch/snap.py b/contrail-controller/hooks/charmhelpers/fetch/snap.py
new file mode 100644
index 0000000..23c707b
--- /dev/null
+++ b/contrail-controller/hooks/charmhelpers/fetch/snap.py
@@ -0,0 +1,122 @@
+# Copyright 2014-2017 Canonical Limited.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#  http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""
+Charm helpers snap for classic charms.
+
+If writing reactive charms, use the snap layer:
+https://lists.ubuntu.com/archives/snapcraft/2016-September/001114.html
+"""
+import subprocess
+from os import environ
+from time import sleep
+from charmhelpers.core.hookenv import log
+
+__author__ = 'Joseph Borg <joseph.borg@canonical.com>'
+
+SNAP_NO_LOCK = 1  # The return code for "couldn't acquire lock" in Snap (hopefully this will be improved).
+SNAP_NO_LOCK_RETRY_DELAY = 10  # Wait X seconds between Snap lock checks.
+SNAP_NO_LOCK_RETRY_COUNT = 30  # Retry to acquire the lock X times.
+
+
+class CouldNotAcquireLockException(Exception):
+    pass
+
+
+def _snap_exec(commands):
+    """
+    Execute snap commands.
+
+    :param commands: List commands
+    :return: Integer exit code
+    """
+    assert type(commands) == list
+
+    retry_count = 0
+    return_code = None
+
+    while return_code is None or return_code == SNAP_NO_LOCK:
+        try:
+            return_code = subprocess.check_call(['snap'] + commands, env=environ)
+        except subprocess.CalledProcessError as e:
+            retry_count += + 1
+            if retry_count > SNAP_NO_LOCK_RETRY_COUNT:
+                raise CouldNotAcquireLockException('Could not aquire lock after %s attempts' % SNAP_NO_LOCK_RETRY_COUNT)
+            return_code = e.returncode
+            log('Snap failed to acquire lock, trying again in %s seconds.' % SNAP_NO_LOCK_RETRY_DELAY, level='WARN')
+            sleep(SNAP_NO_LOCK_RETRY_DELAY)
+
+    return return_code
+
+
+def snap_install(packages, *flags):
+    """
+    Install a snap package.
+
+    :param packages: String or List String package name
+    :param flags: List String flags to pass to install command
+    :return: Integer return code from snap
+    """
+    if type(packages) is not list:
+        packages = [packages]
+
+    flags = list(flags)
+
+    message = 'Installing snap(s) "%s"' % ', '.join(packages)
+    if flags:
+        message += ' with option(s) "%s"' % ', '.join(flags)
+
+    log(message, level='INFO')
+    return _snap_exec(['install'] + flags + packages)
+
+
+def snap_remove(packages, *flags):
+    """
+    Remove a snap package.
+
+    :param packages: String or List String package name
+    :param flags: List String flags to pass to remove command
+    :return: Integer return code from snap
+    """
+    if type(packages) is not list:
+        packages = [packages]
+
+    flags = list(flags)
+
+    message = 'Removing snap(s) "%s"' % ', '.join(packages)
+    if flags:
+        message += ' with options "%s"' % ', '.join(flags)
+
+    log(message, level='INFO')
+    return _snap_exec(['remove'] + flags + packages)
+
+
+def snap_refresh(packages, *flags):
+    """
+    Refresh / Update snap package.
+
+    :param packages: String or List String package name
+    :param flags: List String flags to pass to refresh command
+    :return: Integer return code from snap
+    """
+    if type(packages) is not list:
+        packages = [packages]
+
+    flags = list(flags)
+
+    message = 'Refreshing snap(s) "%s"' % ', '.join(packages)
+    if flags:
+        message += ' with options "%s"' % ', '.join(flags)
+
+    log(message, level='INFO')
+    return _snap_exec(['refresh'] + flags + packages)
-- 
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