Added support for distro Devuan

(Will only work with Devuan >= 4 (Chimaera) - reason is
that in Devuan < 4, the platform.linux_distribution module is
used to get distro details - and this module is unable to
distinguish between Debian and Devuan. In Chimaera, python3 is 3.9,
and in this, platform.linux_distribution has been removed, so that
distro details are obtained using distro.linux_distribution - which
is able to distinguish between Debian and Devuan)

Details:

- added azurelinuxagent/common/osutil/devuan.py
- modified azurelinuxagent/common/osutil/factory.py to use devuan.py
- added init and config files for devuan
- modified setup.py for devuan support
- modified tests/common/osutil/test_factory.py to test devuan support

azurelinuxagent/common/osutil/devuan.py

@@ -0,0 +1,64 @@
+#
+# Copyright 2018 Microsoft Corporation
+#
+# 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.
+#
+# Requires Python 2.6+ and Openssl 1.0+
+#
+
+import os  # pylint: disable=W0611
+import re  # pylint: disable=W0611
+import pwd  # pylint: disable=W0611
+import shutil  # pylint: disable=W0611
+import socket  # pylint: disable=W0611
+import array  # pylint: disable=W0611
+import struct  # pylint: disable=W0611
+import fcntl  # pylint: disable=W0611
+import time  # pylint: disable=W0611
+import base64  # pylint: disable=W0611
+import azurelinuxagent.common.logger as logger  # pylint: disable=W0611
+import azurelinuxagent.common.utils.fileutil as fileutil  # pylint: disable=W0611
+import azurelinuxagent.common.utils.shellutil as shellutil
+import azurelinuxagent.common.utils.textutil as textutil  # pylint: disable=W0611
+from azurelinuxagent.common.osutil.default import DefaultOSUtil
+
+
+class DevuanOSUtil(DefaultOSUtil):
+
+    def __init__(self):
+        super(DevuanOSUtil, self).__init__()
+        self.jit_enabled = True
+
+    def restart_ssh_service(self):
+        logger.info("DevuanOSUtil::restart_ssh_service - trying to restart sshd")
+        return shellutil.run("/usr/sbin/service restart ssh", chk_err=False)
+
+    def stop_agent_service(self):
+        logger.info("DevuanOSUtil::stop_agent_service - trying to stop waagent")
+        return shellutil.run("/usr/sbin/service walinuxagent stop", chk_err=False)
+
+    def start_agent_service(self):
+        logger.info("DevuanOSUtil::start_agent_service - trying to start waagent")
+        return shellutil.run("/usr/sbin/service walinuxagent start", chk_err=False)
+
+    def start_network(self):
+        pass
+
+    def remove_rules_files(self, rules_files=""):
+        pass
+
+    def restore_rules_files(self, rules_files=""):
+        pass
+
+    def get_dhcp_lease_endpoint(self):
+        return self.get_endpoint_from_leases_path('/var/lib/dhcp/dhclient.*.leases')

azurelinuxagent/common/osutil/factory.py

@@ -27,6 +27,7 @@
 from .coreos import CoreOSUtil
 from .debian import DebianOSBaseUtil, DebianOSModernUtil
 from .default import DefaultOSUtil
+from .devuan import DevuanOSUtil
 from .freebsd import FreeBSDOSUtil
 from .gaia import GaiaOSUtil
 from .iosxe import IosxeOSUtil
@@ -102,6 +103,16 @@ def _get_osutil(distro_name, distro_code_name, distro_version, distro_full_name)
 
         return DebianOSBaseUtil()
 
+    # Devuan support only works with v4+ 
+    # Reason is that Devuan v4 (Chimaera) uses python v3.9, in which the 
+    # platform.linux_distribution module has been removed. This was unable
+    # to distinguish between debian and devuan. The new distro.linux_distribution module
+    # is able to distinguish between the two.
+
+    if distro_name == "devuan" and Version(distro_version) >= Version("4"):
+        return DevuanOSUtil()
+
+
     if distro_name in ("redhat", "rhel", "centos", "oracle", "almalinux",
                        "cloudlinux", "rocky"):
         if Version(distro_version) < Version("7"):

config/devuan/waagent.conf

@@ -0,0 +1,130 @@
+#
+# Microsoft Azure Linux Agent Configuration
+#
+
+# Enable extension handling. Do not disable this unless you do not need password reset,
+# backup, monitoring, or any extension handling whatsoever.
+Extensions.Enabled=y
+
+# Which provisioning agent to use. Supported values are "auto" (default), "waagent",
+# "cloud-init", or "disabled".
+Provisioning.Agent=auto
+
+# Password authentication for root account will be unavailable.
+Provisioning.DeleteRootPassword=y
+
+# Generate fresh host key pair.
+Provisioning.RegenerateSshHostKeyPair=y
+
+# Supported values are "rsa", "dsa", "ecdsa", "ed25519", and "auto".
+# The "auto" option is supported on OpenSSH 5.9 (2011) and later.
+Provisioning.SshHostKeyPairType=auto
+
+# Monitor host name changes and publish changes via DHCP requests.
+Provisioning.MonitorHostName=y
+
+# Decode CustomData from Base64.
+Provisioning.DecodeCustomData=n
+
+# Execute CustomData after provisioning.
+Provisioning.ExecuteCustomData=n
+
+# Algorithm used by crypt when generating password hash.
+#Provisioning.PasswordCryptId=6
+
+# Length of random salt used when generating password hash.
+#Provisioning.PasswordCryptSaltLength=10
+
+# Allow reset password of sys user
+Provisioning.AllowResetSysUser=n
+
+# Format if unformatted. If 'n', resource disk will not be mounted.
+ResourceDisk.Format=y
+
+# File system on the resource disk
+# Typically ext3 or ext4. FreeBSD images should use 'ufs2' here.
+ResourceDisk.Filesystem=ext4
+
+# Mount point for the resource disk
+ResourceDisk.MountPoint=/mnt/resource
+
+# Create and use swapfile on resource disk.
+ResourceDisk.EnableSwap=n
+
+# Size of the swapfile.
+ResourceDisk.SwapSizeMB=0
+
+# Comma-separated list of mount options. See mount(8) for valid options.
+ResourceDisk.MountOptions=None
+
+# Enable verbose logging (y|n)
+Logs.Verbose=n
+
+# Enable Console logging, default is y
+# Logs.Console=y
+
+# Is FIPS enabled
+OS.EnableFIPS=n
+
+# Root device timeout in seconds.
+OS.RootDeviceScsiTimeout=300
+
+# If "None", the system default version is used.
+OS.OpensslPath=None
+
+# Set the SSH ClientAliveInterval
+# OS.SshClientAliveInterval=180
+
+# Set the path to SSH keys and configuration files
+OS.SshDir=/etc/ssh
+
+# If set, agent will use proxy server to access internet
+#HttpProxy.Host=None
+#HttpProxy.Port=None
+
+# Detect Scvmm environment, default is n
+# DetectScvmmEnv=n
+
+#
+# Lib.Dir=/var/lib/waagent
+
+#
+# DVD.MountPoint=/mnt/cdrom/secure
+
+#
+# Pid.File=/var/run/waagent.pid
+
+#
+# Extension.LogDir=/var/log/azure
+
+#
+# Home.Dir=/home
+
+# Enable RDMA management and set up, should only be used in HPC images
+# OS.EnableRDMA=y
+
+# Enable or disable goal state processing auto-update, default is enabled
+# AutoUpdate.Enabled=y
+
+# Determine the update family, this should not be changed
+# AutoUpdate.GAFamily=Prod
+
+# Determine if the overprovisioning feature is enabled. If yes, hold extension
+# handling until inVMArtifactsProfile.OnHold is false.
+# Default is enabled
+# EnableOverProvisioning=y
+
+# Allow fallback to HTTP if HTTPS is unavailable
+# Note: Allowing HTTP (vs. HTTPS) may cause security risks
+# OS.AllowHTTP=n
+
+# Add firewall rules to protect access to Azure host node services
+# Note:
+# - The default is false to protect the state of existing VMs
+OS.EnableFirewall=n
+
+# Enforce control groups limits on the agent and extensions
+CGroups.EnforceLimits=n
+
+# CGroups which are excluded from limits, comma separated
+CGroups.Excluded=customscript,runcommand

init/devuan/default/walinuxagent

@@ -0,0 +1,2 @@
+# To disable the Microsoft Azure Agent, set WALINUXAGENT_ENABLED=0
+WALINUXAGENT_ENABLED=1