upgrade.mongo.70.sh

#!/bin/bash

#we have to check since we cannot continue unless
if [ -f /etc/redhat-release ]; then
    CENTOS_MAJOR="$(cat /etc/redhat-release |awk -F'[^0-9]+' '{ print $2 }')"

    if [[ "$CENTOS_MAJOR" != "8" && "$CENTOS_MAJOR" != "9" ]]; then
        echo "Unsupported OS version, only support CentOS/RHEL 8 and 9."
        exit 1
    fi
fi

if [ -f /etc/lsb-release ]; then
    UBUNTU_YEAR="$(lsb_release -sr | cut -d '.' -f 1)";
    UBUNTU_RELEASE="$(lsb_release -cs)"

    if [[ "$UBUNTU_YEAR" != "20" && "$UBUNTU_YEAR" != "22" ]]; then
        echo "Unsupported OS version, only support Ubuntu 20 and 22."
        exit 1
    fi
fi

#check if authentication is required
isAuth=0
if grep -Eq '^\s*authorization\s*:\s*enabled' /etc/mongod.conf; then
    isAuth=1
fi

#check if we have previous upgrade needed
FEATVER=$(mongosh admin --eval "printjson(db.adminCommand( { getParameter: 1, featureCompatibilityVersion: 1 } ).featureCompatibilityVersion)" --quiet);
VER=$(mongod -version | grep "db version" | cut -d ' ' -f 3 | cut -d 'v' -f 2)

if [ "$isAuth" -eq "1" ]; then
    echo "Since authentication is enabled, we cannot verify if you need to run this upgrade script"
    echo ""
    echo "Please run this command with authentication parameters:"
    echo ""
    echo "mongosh admin --eval \"db.adminCommand({ getParameter: 1, featureCompatibilityVersion: 1 } )\""
    echo ""
    echo "and continue only if \"featureCompatibilityVersion\" is 6.0 "
    echo ""
    read -r -p "Is your \"featureCompatibilityVersion\" version is 6.0? [y/N] " response
    if [[ "$response" =~ ^([yY][eE][sS]|[yY])$ ]]
    then
        echo "Continue upgrading"
    else
        echo "Stopping script"
        exit 0;
    fi

fi

if [ -x "$(command -v mongosh)" ]; then
    if echo "$VER" | grep -q -i "7.0" ; then
        if echo "$FEATVER" | grep -q -i "6.0" ; then
            echo "run this command to upgrade to 7.0";
            echo "mongosh admin --eval \"db.adminCommand( { setFeatureCompatibilityVersion: \\\"7.0\\\" } )\"";
        else
            echo "We already have version 7.0";
        fi
        exit 0;
    elif echo "$VER" | grep -q -i "6.0" ; then
        if echo "$FEATVER" | grep -q -i "5.0" ; then
            echo "run this command before upgrading to 7.0";
            echo "mongosh admin --eval \"db.adminCommand( { setFeatureCompatibilityVersion: \\\"6.0\\\" } )\"";
            exit 0;
        else
            echo "Upgrading to MongoDB 7.0";
        fi
    else
        echo "Unsupported MongodB version $VER";
        echo "Upgrade to MongoDB 6.0 first and then run this script";
        exit 1;
    fi

    if [ -f /etc/redhat-release ]; then
        #backup of systemd unit file and mongod.conf file
        \cp /usr/lib/systemd/system/mongod.service /usr/lib/systemd/system/mongod.service.bak
        \cp -f /etc/mongod.conf /etc/mongod.conf.bak
        #uninstall mognodb
        yum erase -y mongodb-org mongodb-org-mongos mongodb-org-server mongodb-org-shell mongodb-org-tools
    fi

    if [ -f /etc/lsb-release ]; then
        #uninstall mognodb
        apt-get remove -y mongodb-org mongodb-org-mongos mongodb-org-server mongodb-org-shell mongodb-org-tools
    fi
fi

if [ -f /etc/redhat-release ]; then
    #install latest mongodb
    #select source based on release
    echo "[mongodb-org-7.0]
name=MongoDB Repository
baseurl=https://repo.mongodb.org/yum/redhat/${CENTOS_MAJOR}/mongodb-org/7.0/x86_64/
gpgcheck=1
enabled=1
gpgkey=https://www.mongodb.org/static/pgp/server-7.0.asc" > /etc/yum.repos.d/mongodb-org-7.0.repo

    yum install -y mongodb-org
    \cp -f /etc/mongod.conf.bak /etc/mongod.conf
fi

if [ -f /etc/lsb-release ]; then
    #install latest mongodb
	wget -qO - https://www.mongodb.org/static/pgp/server-7.0.asc | sudo apt-key add -

    echo "deb [ arch=amd64,arm64 ] http://repo.mongodb.org/apt/ubuntu ${UBUNTU_RELEASE}/mongodb-org/7.0 multiverse" | tee /etc/apt/sources.list.d/mongodb-org-7.0.list ;
    apt-get update
    #install mongodb
    apt-get -o Dpkg::Options::="--force-confdef" -o Dpkg::Options::="--force-confold" install -y mongodb-org --force-yes || (echo "Failed to install mongodb." ; exit)
fi

if [ -f /etc/redhat-release ]; then
    #Restoring systemd unit file
    \cp -f /usr/lib/systemd/system/mongod.service.bak /usr/lib/systemd/system/mongod.service
    systemctl daemon-reload
fi

# check and comment out journal: enabled: true in mongod.conf
CONF_FILE="/etc/mongod.conf"
if grep -qP '^\s*journal\s*:\s*$' "$CONF_FILE" && grep -qP '^\s*enabled\s*:\s*true\s*$' "$CONF_FILE"; then
    echo "Commenting out journal: enabled: true in $CONF_FILE"
    sed -i '/^\s*journal\s*:/ { N; s/\(.*\n\s*\)\(enabled\s*:\s*true\s*$\)/# \1# \2/ }' "$CONF_FILE"
else
    echo "Could not find 'journal: enabled: true' in $CONF_FILE or it's already commented."
fi

#mongodb might need to be started
systemctl restart mongod || echo "mongodb systemctl job does not exist"

#nc not available on latest centos
#until nc -z localhost 27017; do echo Waiting for MongoDB; sleep 1; done
mongosh --nodb --eval 'var conn; print("Waiting for MongoDB connection on port 27017. Exit if incorrect port"); var cnt = 0; while(!conn && cnt <= 300){try{conn = new Mongo("localhost:27017");}catch(Error){}sleep(1000);cnt++;}'

if [ "$isAuth" -eq "1" ]; then
    echo "run this command with authentication to upgrade to 7.0"
    echo "mongosh admin --eval \"db.adminCommand( { setFeatureCompatibilityVersion: \\\"7.0\\\" } )\""
elif ! mongosh admin --eval "printjson(db.adminCommand( { getParameter: 1, featureCompatibilityVersion: 1 } ))" ; then
    echo "Could not connect to MongodB, run this command when Mongo is up and running"
    echo "mongosh admin --eval \"db.adminCommand( { setFeatureCompatibilityVersion: \\\"7.0\\\" } )\""
else
    mongosh admin --eval "printjson(db.adminCommand( { getParameter: 1, featureCompatibilityVersion: 1 } ))"
    mongosh admin --eval "db.adminCommand( { setFeatureCompatibilityVersion: \"7.0\", confirm: true } )"
    echo "Finished upgrading script"
fi