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From 07d283a6e20b8e559257c9694f7e36e155075014 Mon Sep 17 00:00:00 2001
From: Michele Baldessari <michele@acksyn.org>
Date: Sun, 22 Jul 2018 17:54:29 +0200
Subject: [PATCH] Initial podman support

Tested with the following container:
     podman container set: test_bundle [docker.io/sdelrio/docker-minimal-nginx]
       test_bundle-podman-0 (ocf::heartbeat:podman):        Started nodea
       test_bundle-podman-1 (ocf::heartbeat:podman):        Started nodeb
       test_bundle-podman-2 (ocf::heartbeat:podman):        Started nodec

Tested a couple of stop/start cycles successfully. Needs the
corresponding pacemaker support https://github.com/ClusterLabs/pacemaker/pull/1564
---
 doc/man/Makefile.am   |   1 +
 heartbeat/Makefile.am |   1 +
 heartbeat/podman      | 488 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 490 insertions(+)
 create mode 100755 heartbeat/podman

diff --git a/doc/man/Makefile.am b/doc/man/Makefile.am
index 145e5fd50..0bef88740 100644
--- a/doc/man/Makefile.am
+++ b/doc/man/Makefile.am
@@ -151,6 +151,7 @@ man_MANS	       = ocf_heartbeat_AoEtarget.7 \
                           ocf_heartbeat_pgagent.7 \
                           ocf_heartbeat_pgsql.7 \
                           ocf_heartbeat_pingd.7 \
+                          ocf_heartbeat_podman.7 \
                           ocf_heartbeat_portblock.7 \
                           ocf_heartbeat_postfix.7 \
                           ocf_heartbeat_pound.7 \
diff --git a/heartbeat/Makefile.am b/heartbeat/Makefile.am
index e7a3a4fac..993bff042 100644
--- a/heartbeat/Makefile.am
+++ b/heartbeat/Makefile.am
@@ -146,6 +146,7 @@ ocf_SCRIPTS	     =  AoEtarget		\
 			pgagent			\
 			pgsql			\
 			pingd			\
+			podman			\
 			portblock		\
 			postfix			\
 			pound			\
diff --git a/heartbeat/podman b/heartbeat/podman
new file mode 100755
index 000000000..88475f1df
--- /dev/null
+++ b/heartbeat/podman
@@ -0,0 +1,488 @@
+#!/bin/sh
+#
+# The podman HA resource agent creates and launches a podman container
+# based off a supplied podman image. Containers managed by this agent
+# are both created and removed upon the agent's start and stop actions.
+#
+# Copyright (c) 2014 David Vossel <davidvossel@gmail.com>
+#                    Michele Baldessari <michele@acksyn.org>
+#                    All Rights Reserved.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of version 2 of the GNU General Public License as
+# published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it would be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+#
+# Further, this software is distributed without any warranty that it is
+# free of the rightful claim of any third person regarding infringement
+# or the like.  Any license provided herein, whether implied or
+# otherwise, applies only to this software file.  Patent licenses, if
+# any, provided herein do not apply to combinations of this program with
+# other software, or any other product whatsoever.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write the Free Software Foundation,
+# Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
+#
+
+#######################################################################
+# Initialization:
+
+: ${OCF_FUNCTIONS_DIR=${OCF_ROOT}/lib/heartbeat}
+. ${OCF_FUNCTIONS_DIR}/ocf-shellfuncs
+
+#######################################################################
+
+meta_data()
+{
+	cat <<END
+<?xml version="1.0"?>
+<!DOCTYPE resource-agent SYSTEM "ra-api-1.dtd">
+<resource-agent name="podman">
+<version>1.0</version>
+
+<longdesc lang="en">
+The podman HA resource agent creates and launches a podman container
+based off a supplied podman image. Containers managed by this agent
+are both created and removed upon the agent's start and stop actions.
+</longdesc>
+<shortdesc lang="en">Podman container resource agent.</shortdesc>
+
+<parameters>
+<parameter name="image" required="1" unique="0">
+<longdesc lang="en">
+The podman image to base this container off of.
+</longdesc>
+<shortdesc lang="en">podman image</shortdesc>
+<content type="string"/>
+</parameter>
+
+<parameter name="name" required="0" unique="0">
+<longdesc lang="en">
+The name to give the created container. By default this will
+be that resource's instance name.
+</longdesc>
+<shortdesc lang="en">podman container name</shortdesc>
+<content type="string"/>
+</parameter>
+
+<parameter name="allow_pull" unique="0">
+<longdesc lang="en">
+Allow the image to be pulled from the configured podman registry when
+the image does not exist locally. NOTE, this can drastically increase
+the time required to start the container if the image repository is
+pulled over the network.
+</longdesc>
+<shortdesc lang="en">Allow pulling non-local images</shortdesc>
+<content type="boolean"/>
+</parameter>
+
+<parameter name="run_opts" required="0" unique="0">
+<longdesc lang="en">
+Add options to be appended to the 'podman run' command which is used
+when creating the container during the start action. This option allows
+users to do things such as setting a custom entry point and injecting
+environment variables into the newly created container. Note the '-d'
+option is supplied regardless of this value to force containers to run
+in the background.
+
+NOTE: Do not explicitly specify the --name argument in the run_opts. This
+agent will set --name using either the resource's instance or the name
+provided in the 'name' argument of this agent.
+
+</longdesc>
+<shortdesc lang="en">run options</shortdesc>
+<content type="string"/>
+</parameter>
+
+<parameter name="run_cmd" required="0" unique="0">
+<longdesc lang="en">
+Specify a command to launch within the container once
+it has initialized.
+</longdesc>
+<shortdesc lang="en">run command</shortdesc>
+<content type="string"/>
+</parameter>
+
+<parameter name="mount_points" required="0" unique="0">
+<longdesc lang="en">
+A comma separated list of directories that the container is expecting to use.
+The agent will ensure they exist by running 'mkdir -p'
+</longdesc>
+<shortdesc lang="en">Required mount points</shortdesc>
+<content type="string"/>
+</parameter>
+
+<parameter name="monitor_cmd" required="0" unique="0">
+<longdesc lang="en">
+Specify the full path of a command to launch within the container to check
+the health of the container. This command must return 0 to indicate that
+the container is healthy. A non-zero return code will indicate that the
+container has failed and should be recovered.
+
+If 'podman exec' is supported, it is used to execute the command. If not,
+nsenter is used.
+
+Note: Using this method for monitoring processes inside a container
+is not recommended, as containerd tries to track processes running
+inside the container and does not deal well with many short-lived
+processes being spawned. Ensure that your container monitors its
+own processes and terminates on fatal error rather than invoking
+a command from the outside.
+</longdesc>
+<shortdesc lang="en">monitor command</shortdesc>
+<content type="string"/>
+</parameter>
+
+<parameter name="force_kill" required="0" unique="0">
+<longdesc lang="en">
+Kill a container immediately rather than waiting for it to gracefully
+shutdown
+</longdesc>
+<shortdesc lang="en">force kill</shortdesc>
+<content type="boolean"/>
+</parameter>
+
+<parameter name="reuse" required="0" unique="0">
+<longdesc lang="en">
+Allow the container to be reused after stopping the container. By default
+containers are removed after stop. With the reuse option containers
+will persist after the container stops.
+</longdesc>
+<shortdesc lang="en">reuse container</shortdesc>
+<content type="boolean"/>
+</parameter>
+</parameters>
+
+<actions>
+<action name="start"        timeout="90s" />
+<action name="stop"         timeout="90s" />
+<action name="monitor"      timeout="30s" interval="30s" depth="0" />
+<action name="meta-data"    timeout="5s" />
+<action name="validate-all"   timeout="30s" />
+</actions>
+</resource-agent>
+END
+}
+
+#######################################################################
+REQUIRE_IMAGE_PULL=0
+
+podman_usage()
+{
+	cat <<END
+usage: $0 {start|stop|monitor|validate-all|meta-data}
+
+Expects to have a fully populated OCF RA-compliant environment set.
+END
+}
+
+
+monitor_cmd_exec()
+{
+	local rc=$OCF_SUCCESS
+	local out
+
+	if [ -z "$OCF_RESKEY_monitor_cmd" ]; then
+		return $rc
+	fi
+
+	if podman exec --help >/dev/null 2>&1; then
+		out=$(podman exec ${CONTAINER} $OCF_RESKEY_monitor_cmd 2>&1)
+		rc=$?
+	else
+		out=$(echo "$OCF_RESKEY_monitor_cmd" | nsenter --target $(podman inspect --format {{.State.Pid}} ${CONTAINER}) --mount --uts --ipc --net --pid 2>&1)
+		rc=$?
+	fi
+
+	if [ $rc -eq 127 ]; then
+		ocf_log err "monitor cmd failed (rc=$rc), output: $out"
+		ocf_exit_reason "monitor_cmd, ${OCF_RESKEY_monitor_cmd} , not found within container."
+		# there is no recovering from this, exit immediately
+		exit $OCF_ERR_ARGS
+	elif [ $rc -ne 0 ]; then
+		ocf_exit_reason "monitor cmd failed (rc=$rc), output: $out"
+		rc=$OCF_ERR_GENERIC
+	else
+		ocf_log debug "monitor cmd passed: exit code = $rc"
+	fi
+
+	return $rc
+}
+
+container_exists()
+{
+	podman inspect --format {{.State.Running}} $CONTAINER | egrep '(true|false)' >/dev/null 2>&1
+}
+
+remove_container()
+{
+	if ocf_is_true "$OCF_RESKEY_reuse"; then
+		# never remove the container if we have reuse enabled.
+		return 0
+	fi
+
+	container_exists
+	if [ $? -ne 0 ]; then
+		# don't attempt to remove a container that doesn't exist
+		return 0
+	fi
+	ocf_log notice "Cleaning up inactive container, ${CONTAINER}."
+	ocf_run podman rm $CONTAINER
+}
+
+podman_simple_status()
+{
+	local val
+
+	container_exists
+	if [ $? -ne 0 ]; then
+		return $OCF_NOT_RUNNING
+	fi
+
+	# retrieve the 'Running' attribute for the container
+	val=$(podman inspect --format {{.State.Running}} $CONTAINER 2>/dev/null)
+	if [ $? -ne 0 ]; then
+		#not running as a result of container not being found
+		return $OCF_NOT_RUNNING
+	fi
+
+	if ocf_is_true "$val"; then
+		# container exists and is running
+		return $OCF_SUCCESS
+	fi
+
+	return $OCF_NOT_RUNNING
+}
+
+podman_monitor()
+{
+	local rc=0
+
+	podman_simple_status
+	rc=$?
+
+	if [ $rc -ne 0 ]; then
+		return $rc
+	fi
+
+	monitor_cmd_exec
+}
+
+podman_create_mounts() {
+	oldIFS="$IFS"
+	IFS=","
+	for directory in $OCF_RESKEY_mount_points; do
+		mkdir -p "$directory"
+	done
+	IFS="$oldIFS"
+}
+
+podman_start()
+{
+	podman_create_mounts
+	local run_opts="-d --name=${CONTAINER}"
+	# check to see if the container has already started
+	podman_simple_status
+	if [ $? -eq $OCF_SUCCESS ]; then
+		return $OCF_SUCCESS
+	fi
+
+	if [ -n "$OCF_RESKEY_run_opts" ]; then
+		run_opts="$run_opts $OCF_RESKEY_run_opts"
+	fi
+
+	if [ $REQUIRE_IMAGE_PULL -eq 1 ]; then
+		ocf_log notice "Beginning pull of image, ${OCF_RESKEY_image}"
+		podman pull "${OCF_RESKEY_image}"
+		if [ $? -ne 0 ]; then
+			ocf_exit_reason "failed to pull image ${OCF_RESKEY_image}"
+			return $OCF_ERR_GENERIC
+		fi
+	fi
+
+	if ocf_is_true "$OCF_RESKEY_reuse" && container_exists; then
+		ocf_log info "starting existing container $CONTAINER."
+		ocf_run podman start $CONTAINER
+	else
+		# make sure any previous container matching our container name is cleaned up first.
+		# we already know at this point it wouldn't be running
+		remove_container
+		ocf_log info "running container $CONTAINER for the first time"
+		ocf_run podman run $run_opts $OCF_RESKEY_image $OCF_RESKEY_run_cmd
+	fi
+
+	if [ $? -ne 0 ]; then
+		ocf_exit_reason "podman failed to launch container"
+		return $OCF_ERR_GENERIC
+	fi
+
+
+	# wait for monitor to pass before declaring that the container is started
+	while true; do
+		podman_simple_status
+		if [ $? -ne $OCF_SUCCESS ]; then
+			ocf_exit_reason "Newly created podman container exited after start"
+			return $OCF_ERR_GENERIC
+		fi
+
+		monitor_cmd_exec
+		if [ $? -eq $OCF_SUCCESS ]; then
+			ocf_log notice "Container $CONTAINER  started successfully"
+			return $OCF_SUCCESS
+		fi
+
+		ocf_exit_reason "waiting on monitor_cmd to pass after start"
+		sleep 1
+	done
+}
+
+podman_stop()
+{
+	local timeout=60
+	podman_simple_status
+	if [ $? -eq  $OCF_NOT_RUNNING ]; then
+		remove_container
+		return $OCF_SUCCESS
+	fi
+
+	if [ -n "$OCF_RESKEY_CRM_meta_timeout" ]; then
+		timeout=$((($OCF_RESKEY_CRM_meta_timeout/1000) -10 ))
+		if [ $timeout -lt 10 ]; then
+			timeout=10
+		fi
+	fi
+
+	if ocf_is_true "$OCF_RESKEY_force_kill"; then
+		ocf_run podman kill $CONTAINER
+	else
+		ocf_log debug "waiting $timeout second[s] before killing container"
+		ocf_run podman stop -t=$timeout $CONTAINER
+	fi
+
+	if [ $? -ne 0 ]; then
+		ocf_exit_reason "Failed to stop container, ${CONTAINER}, based on image, ${OCF_RESKEY_image}."
+		return $OCF_ERR_GENERIC
+	fi
+
+	remove_container
+	if [ $? -ne 0 ]; then
+		ocf_exit_reason "Failed to remove stopped container, ${CONTAINER}, based on image, ${OCF_RESKEY_image}."
+		return $OCF_ERR_GENERIC
+	fi
+
+	return $OCF_SUCCESS
+}
+
+image_exists()
+{
+	# if no tag was specified, use default "latest"
+	local COLON_FOUND=0
+	local SLASH_FOUND=0
+	local SERVER_NAME=""
+	local IMAGE_NAME="${OCF_RESKEY_image}"
+	local IMAGE_TAG="latest"
+
+	SLASH_FOUND="$(echo "${OCF_RESKEY_image}" | grep -o '/' | grep -c .)"
+
+	if [ ${SLASH_FOUND} -ge 1 ]; then
+		SERVER_NAME="$(echo ${IMAGE_NAME} | cut -d / -f 1-${SLASH_FOUND})"
+		IMAGE_NAME="$(echo ${IMAGE_NAME} | awk -F'/' '{print $NF}')"
+	fi
+
+	COLON_FOUND="$(echo "${IMAGE_NAME}" | grep -o ':' | grep -c .)"
+	if [ ${COLON_FOUND} -ge 1 ]; then
+		IMAGE_TAG="$(echo ${IMAGE_NAME} | awk -F':' '{print $NF}')"
+		IMAGE_NAME="$(echo ${IMAGE_NAME} | cut -d : -f 1-${COLON_FOUND})"
+	fi
+
+	# IMAGE_NAME might be following formats:
+	# - image
+	# - repository:port/image
+	# - docker.io/image (some distro will display "docker.io/" as prefix)
+	podman images | awk '{print $1 ":" $2}' | egrep -q -s "^(docker.io\/|${SERVER_NAME}\/)?${IMAGE_NAME}:${IMAGE_TAG}\$"
+	if [ $? -eq 0 ]; then
+		# image found
+		return 0
+	fi
+
+	if ocf_is_true "$OCF_RESKEY_allow_pull"; then
+		REQUIRE_IMAGE_PULL=1
+		ocf_log notice "Image (${OCF_RESKEY_image}) does not exist locally but will be pulled during start"
+		return 0
+	fi
+	# image not found.
+	return 1
+}
+
+podman_validate()
+{
+	check_binary podman
+	if [ -z "$OCF_RESKEY_image" ]; then
+		ocf_exit_reason "'image' option is required"
+		exit $OCF_ERR_CONFIGURED
+	fi
+
+	if [ -n "$OCF_RESKEY_monitor_cmd" ]; then
+		podman exec --help >/dev/null 2>&1
+		if [ ! $? ]; then
+			ocf_log info "checking for nsenter, which is required when 'monitor_cmd' is specified"
+			check_binary nsenter
+		fi
+	fi
+
+	image_exists
+	if [ $? -ne 0 ]; then
+		ocf_exit_reason "base image, ${OCF_RESKEY_image}, could not be found."
+		exit $OCF_ERR_CONFIGURED
+	fi
+
+	return $OCF_SUCCESS
+}
+
+# TODO :
+# When a user starts plural clones in a node in globally-unique, a user cannot appoint plural name parameters.
+# When a user appoints reuse, the resource agent cannot connect plural clones with a container.
+
+if ocf_is_true "$OCF_RESKEY_CRM_meta_globally_unique"; then
+	if [ -n "$OCF_RESKEY_name" ]; then
+		if [ -n "$OCF_RESKEY_CRM_meta_clone_node_max" ] && [ "$OCF_RESKEY_CRM_meta_clone_node_max" -ne 1 ]
+		then
+			ocf_exit_reason "Cannot make plural clones from the same name parameter."
+			exit $OCF_ERR_CONFIGURED
+		fi
+		if [ -n "$OCF_RESKEY_CRM_meta_master_node_max" ] && [ "$OCF_RESKEY_CRM_meta_master_node_max" -ne 1 ]
+		then
+			ocf_exit_reason "Cannot make plural master from the same name parameter."
+			exit $OCF_ERR_CONFIGURED
+		fi
+	fi
+	: ${OCF_RESKEY_name=`echo ${OCF_RESOURCE_INSTANCE} | tr ':' '-'`}
+else
+	: ${OCF_RESKEY_name=${OCF_RESOURCE_INSTANCE}}
+fi
+
+CONTAINER=$OCF_RESKEY_name
+
+case $__OCF_ACTION in
+meta-data) meta_data
+		exit $OCF_SUCCESS;;
+start)
+	podman_validate
+	podman_start;;
+stop)		podman_stop;;
+monitor)	podman_monitor;;
+validate-all)	podman_validate;;
+usage|help)	podman_usage
+		exit $OCF_SUCCESS
+		;;
+*)		podman_usage
+		exit $OCF_ERR_UNIMPLEMENTED
+		;;
+esac
+rc=$?
+ocf_log debug "${OCF_RESOURCE_INSTANCE} $__OCF_ACTION : $rc"
+exit $rc