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#!/bin/bash

# A heat-config-script which runs yum update during a stack-update.
# Inputs:
#   deploy_action - yum will only be run if this is UPDATE
#   update_identifier - yum will only run for previously unused values of update_identifier
#   command - yum sub-command to run, defaults to "update"
#   command_arguments - yum command arguments, defaults to ""

echo "Started yum_update.sh on server $deploy_server_id at `date`"
echo -n "false" > $heat_outputs_path.update_managed_packages

if [[ -z "$update_identifier" ]]; then
    echo "Not running due to unset update_identifier"
    exit 0
fi

timestamp_dir=/var/lib/overcloud-yum-update
mkdir -p $timestamp_dir

# sanitise to remove unusual characters
update_identifier=${update_identifier//[^a-zA-Z0-9-_]/}

# seconds to wait for this node to rejoin the cluster after update
cluster_start_timeout=360

timestamp_file="$timestamp_dir/$update_identifier"
if [[ -a "$timestamp_file" ]]; then
    echo "Not running for already-run timestamp \"$update_identifier\""
    exit 0
fi
touch "$timestamp_file"

command_arguments=${command_arguments:-}

list_updates=$(yum list updates)

if [[ "$list_updates" == "" ]]; then
    echo "No packages require updating"
    exit 0
fi

pacemaker_status=$(systemctl is-active pacemaker)

if [[ "$pacemaker_status" == "active" ]] ; then
    echo "Pacemaker running, stopping cluster node and doing full package update"
    pcs cluster stop
else
    echo "Excluding upgrading packages that are handled by config management tooling"
    command_arguments="$command_arguments --skip-broken"
    for exclude in $(cat /var/lib/tripleo/installed-packages/* | sort -u); do
        command_arguments="$command_arguments --exclude $exclude"
    done
fi

command=${command:-update}
full_command="yum -y $command $command_arguments"
echo "Running: $full_command"

result=$($full_command)
return_code=$?
echo "$result"
echo "yum return code: $return_code"

if [[ "$pacemaker_status" == "active" ]] ; then
    echo "Starting cluster node"
    pcs cluster start

    hostname=$(hostname -s)
    tstart=$(date +%s)
    while [[ "$(pcs status | grep "^Online" | grep -F -o $hostname)" == "" ]]; do
        sleep 5
        tnow=$(date +%s)
        if (( tnow-tstart > cluster_start_timeout )) ; then
            echo "ERROR $hostname failed to join cluster in $cluster_start_timeout seconds"
            pcs status
            exit 1
        fi
    done
    pcs status

else
    echo -n "true" > $heat_outputs_path.update_managed_packages
fi

echo "Finished yum_update.sh on server $deploy_server_id at `date`"

exit $return_code