vm/lib.sh

#!/bin/bash
# shellcheck disable=2034,2059
true
# see https://github.com/koalaman/shellcheck/wiki/Directive

## VARIABLES

# Dirs
SCRIPTS=/var/scripts
NCPATH=/var/www/nextcloud
HTML=/var/www
POOLNAME=ncdata
NCDATA=/mnt/"$POOLNAME"
SNAPDIR=/var/snap/spreedme
GPGDIR=/tmp/gpg
SHA256_DIR=/tmp/shas56
BACKUP=/mnt/NCBACKUP
RORDIR=/opt/es/
NC_APPS_PATH=$NCPATH/apps
VMLOGS=/var/log/nextcloud

# Helper function for generating random passwords
gen_passwd() {
    local length=$1
    local charset="$2"
    local password=""
    while [ ${#password} -lt "$length" ]
    do
        password=$(echo "$password""$(head -c 100 /dev/urandom | LC_ALL=C tr -dc "$charset")" | fold -w "$length" | head -n 1)
    done
    echo "$password"
}

# Ubuntu OS
DISTRO=$(lsb_release -sr)
KEYBOARD_LAYOUT=$(localectl status | grep "Layout" | awk '{print $3}')
# Hypervisor
# HYPERVISOR=$(dmesg --notime | grep -i hypervisor | cut -d ':' -f2 | head -1 | tr -d ' ') TODO
SYSVENDOR=$(cat /sys/devices/virtual/dmi/id/sys_vendor)
# Network
IFACE=$(ip r | grep "default via" | awk '{print $5}')
IFACE2=$(ip -o link show | awk '{print $2,$9}' | grep 'UP' | cut -d ':' -f 1)
REPO=$(grep deb-src /etc/apt/sources.list | grep http | awk '{print $3}' | head -1)
ADDRESS=$(hostname -I | cut -d ' ' -f 1)
# WANIP4=$(dig +short myip.opendns.com @resolver1.opendns.com) # as an alternative
WANIP4=$(curl -s -k -m 5 https://ipv4bot.whatismyipaddress.com)
INTERFACES="/etc/netplan/01-netcfg.yaml"
GATEWAY=$(ip route | grep default | awk '{print $3}')
# Internet DNS required when a check needs to be made to a server outside the home/SME
INTERNET_DNS="9.9.9.9"
# Default Quad9 DNS servers, overwritten by the systemd global DNS defined servers, if set
DNS1="9.9.9.9"
DNS2="149.112.112.112"
use_global_systemd_dns() {
if [ -f "/etc/systemd/resolved.conf" ]
then
    local resolvedDns1
    resolvedDns1=$(grep -m 1 -E "^DNS=.+" /etc/systemd/resolved.conf | sed s/^DNS=// | awk '{print $1}')
    if [ -n "$resolvedDns1" ]
    then
        DNS1="$resolvedDns1"

        local resolvedDns2
        resolvedDns2=$(grep -m 1 -E "^DNS=.+" /etc/systemd/resolved.conf | sed s/^DNS=// | awk '{print $2}')
        if [ -n "$resolvedDns2" ]
        then
            DNS2="$resolvedDns2"
        else
            DNS2=
        fi
    fi
fi
}
use_global_systemd_dns

# Whiptails
TITLE="Nextcloud VM - $(date +%Y)"
[ -n "$SCRIPT_NAME" ] && TITLE+=" - $SCRIPT_NAME"
CHECKLIST_GUIDE="Navigate with the [ARROW] keys and (de)select with the [SPACE] key. Confirm by pressing [ENTER]"
MENU_GUIDE="Navigate with the [ARROW] keys and confirm by pressing [ENTER]"
RUN_LATER_GUIDE="You can view this script later by running 'sudo bash $SCRIPTS/menu.sh'"
# Repo
GITHUB_REPO="https://raw.githubusercontent.com/nextcloud/vm/master"
STATIC="$GITHUB_REPO/static"
LETS_ENC="$GITHUB_REPO/lets-encrypt"
APP="$GITHUB_REPO/apps"
OLD="$GITHUB_REPO/old"
ADDONS="$GITHUB_REPO/addons"
MENU="$GITHUB_REPO/menu"
DISK="$GITHUB_REPO/disk"
NETWORK="$GITHUB_REPO/network"
VAGRANT_DIR="$GITHUB_REPO/vagrant"
NOT_SUPPORTED="$GITHUB_REPO/not-supported"
NCREPO="https://download.nextcloud.com/server/releases"
ISSUES="https://github.com/nextcloud/vm/issues"
# User information
NCPASS=nextcloud
NCUSER=ncadmin
UNIXUSER=$SUDO_USER
UNIXUSER_PROFILE="/home/$UNIXUSER/.bash_profile"
ROOT_PROFILE="/root/.bash_profile"
# User for Bitwarden
BITWARDEN_USER=bitwarden
BITWARDEN_HOME=/home/"$BITWARDEN_USER"
# Database
SHUF=$(shuf -i 25-29 -n 1)
PGDB_PASS=$(gen_passwd "$SHUF" "a-zA-Z0-9@#*=")
NEWPGPASS=$(gen_passwd "$SHUF" "a-zA-Z0-9@#*=")
ncdb() {
    NCCONFIGDB=$(grep "dbname" $NCPATH/config/config.php | awk '{print $3}' | sed "s/[',]//g")
}
[ -n "$NCDB" ] && ncdb # TODO: remove this line someday
ncdbpass() {
    NCCONFIGDBPASS=$(grep "dbpassword" $NCPATH/config/config.php | awk '{print $3}' | sed "s/[',]//g")
}
[ -n "$NCDBPASS" ] && ncdbpass # TODO: remove this line someday
# Path to specific files
SECURE="$SCRIPTS/setup_secure_permissions_nextcloud.sh"
# Nextcloud version
nc_update() {
    CURRENTVERSION=$(sudo -u www-data php $NCPATH/occ status | grep "versionstring" | awk '{print $3}')
    NCVERSION=$(curl -s -m 900 $NCREPO/ | sed --silent 's/.*href="nextcloud-\([^"]\+\).zip.asc".*/\1/p' | sort --version-sort | tail -1)
    STABLEVERSION="nextcloud-$NCVERSION"
    NCMAJOR="${NCVERSION%%.*}"
    NCBAD=$((NCMAJOR-2))
}
[ -n "$NC_UPDATE" ] && nc_update # TODO: remove this line someday
# Set the hour for automatic updates. This would be 18:00 as only the hour is configurable.
AUT_UPDATES_TIME="18"
# Keys
OpenPGP_fingerprint='28806A878AE423A28372792ED75899B9A724937A'
# Letsencrypt
SITES_AVAILABLE="/etc/apache2/sites-available"
LETSENCRYPTPATH="/etc/letsencrypt"
CERTFILES="$LETSENCRYPTPATH/live"
DHPARAMS_TLS="$CERTFILES/$TLSDOMAIN/dhparam.pem"
DHPARAMS_SUB="$CERTFILES/$SUBDOMAIN/dhparam.pem"
TLS_CONF="nextcloud_tls_domain_self_signed.conf"
HTTP_CONF="nextcloud_http_domain_self_signed.conf"
# Collabora App
HTTPS_CONF="$SITES_AVAILABLE/$SUBDOMAIN.conf"
HTTP2_CONF="/etc/apache2/mods-available/http2.conf"
# PHP-FPM
PHPVER=7.4
PHP_FPM_DIR=/etc/php/$PHPVER/fpm
PHP_INI=$PHP_FPM_DIR/php.ini
PHP_POOL_DIR=$PHP_FPM_DIR/pool.d
PHP_MODS_DIR=/etc/php/"$PHPVER"/mods-available
# Adminer
ADMINERDIR=/usr/share/adminer
ADMINER_CONF="$SITES_AVAILABLE/adminer.conf"
# Redis
REDIS_CONF=/etc/redis/redis.conf
REDIS_SOCK=/var/run/redis/redis-server.sock
RSHUF=$(shuf -i 30-35 -n 1)
REDIS_PASS=$(gen_passwd "$SHUF" "a-zA-Z0-9@#*=")
# Extra security
SPAMHAUS=/etc/spamhaus.wl
ENVASIVE=/etc/apache2/mods-available/mod-evasive.load
APACHE2=/etc/apache2/apache2.conf
# Full text Search
es_install() {
    INDEX_USER=$(gen_passwd "$SHUF" '[:lower:]')
    ROREST=$(gen_passwd "$SHUF" "A-Za-z0-9")
    nc_fts="ark74/nc_fts"
    fts_es_name="fts_esror"
}
[ -n "$ES_INSTALL" ] && es_install # TODO: remove this line someday
# Talk
turn_install() {
    TURN_CONF="/etc/turnserver.conf"
    TURN_PORT=3478
    TURN_DOMAIN=$(sudo -u www-data /var/www/nextcloud/occ config:system:get overwrite.cli.url | sed 's|https://||;s|/||')
    SHUF=$(shuf -i 25-29 -n 1)
    TURN_SECRET=$(gen_passwd "$SHUF" "a-zA-Z0-9@#*=")
    JANUS_API_KEY=$(gen_passwd "$SHUF" "a-zA-Z0-9@#*=")
    NC_SECRET=$(gen_passwd "$SHUF" "a-zA-Z0-9@#*=")
    SIGNALING_SERVER_CONF=/etc/signaling/server.conf
    NONO_PORTS=(22 25 53 80 443 1024 3012 3306 5178 5179 5432 7983 8983 10000 8081 8443 9443)
}
[ -n "$TURN_INSTALL" ] && turn_install # TODO: remove this line someday

## FUNCTIONS

# If script is running as root?
#
# Example:
# if is_root
# then
#     # do stuff
# else
#     print_text_in_color "$IRed" "You are not root..."
#     exit 1
# fi
#
is_root() {
    if [[ "$EUID" -ne 0 ]]
    then
        return 1
    else
        return 0
    fi
}

# Check if root
root_check() {
if ! is_root
then
    msg_box "Sorry, you are not root. You now have two options:

1. With SUDO directly:
   a) :~$ sudo bash $SCRIPTS/name-of-script.sh

2. Become ROOT and then type your command:
   a) :~$ sudo -i
   b) :~# bash $SCRIPTS/name-of-script.sh

In both cases above you can leave out $SCRIPTS/ if the script
is directly in your PATH.

More information can be found here: https://unix.stackexchange.com/a/3064"
    exit 1
fi
}

debug_mode() {
if [ "$DEBUG" -eq 1 ]
then
    set -ex
fi
}

msg_box() {
    [ -n "$2" ] && local SUBTITLE=" - $2"
    whiptail --title "$TITLE$SUBTITLE" --msgbox "$1" "$WT_HEIGHT" "$WT_WIDTH" 3>&1 1>&2 2>&3
}

yesno_box_yes() {
    [ -n "$2" ] && local SUBTITLE=" - $2"
    if (whiptail --title "$TITLE$SUBTITLE" --yesno "$1" "$WT_HEIGHT" "$WT_WIDTH" 3>&1 1>&2 2>&3)
    then
        return 0
    else
        return 1
    fi
}

yesno_box_no() {
    [ -n "$2" ] && local SUBTITLE=" - $2"
    if (whiptail --title "$TITLE$SUBTITLE" --defaultno --yesno "$1" "$WT_HEIGHT" "$WT_WIDTH" 3>&1 1>&2 2>&3)
    then
        return 0
    else
        return 1
    fi
}

input_box() {
    [ -n "$2" ] && local SUBTITLE=" - $2"
    local RESULT && RESULT=$(whiptail --title "$TITLE$SUBTITLE" --nocancel --inputbox "$1" "$WT_HEIGHT" "$WT_WIDTH" 3>&1 1>&2 2>&3)
    echo "$RESULT"
}

input_box_flow() {
    local RESULT
    while :
    do
        RESULT=$(input_box "$1" "$2")
        if [ -z "$RESULT" ]
        then
            msg_box "Input is empty, please try again." "$2"
        elif ! yesno_box_yes "Is this correct? $RESULT" "$2"
        then
            msg_box "OK, please try again." "$2"
        else
            break
        fi
    done
    echo "$RESULT"
}

explainer_popup() {
    msg_box "$SCRIPT_EXPLAINER"
    if ! yesno_box_yes "Do you want to proceed with this script?"
    then
        exit 1
    fi
}

reinstall_remove_menu() {
    choice=$(whiptail --title "$TITLE" --menu \
"It seems like $SCRIPT_NAME is already installed.\nChoose what you want to do.
$MENU_GUIDE\n\n$RUN_LATER_GUIDE" "$WT_HEIGHT" "$WT_WIDTH" 4 \
"Reinstall $SCRIPT_NAME" "" \
"Uninstall $SCRIPT_NAME" "" 3>&1 1>&2 2>&3)
    if [ -z "$choice" ]
    then
        exit 1
    fi
}

removal_popup() {
    if [ "$choice" = "Uninstall $SCRIPT_NAME" ]
    then
        msg_box "$SCRIPT_NAME was successfully uninstalled."
        exit
    else
        print_text_in_color "$ICyan" "Reinstalling $SCRIPT_NAME..."
    fi
}

# Check if process is runnnig: is_process_running dpkg
is_process_running() {
PROCESS="$1"

while :
do
    RESULT=$(pgrep "${PROCESS}")

    if [ "${RESULT:-null}" = null ]; then
            break
    else
            print_text_in_color "$ICyan" "${PROCESS} is running, waiting for it to stop..."
            sleep 10
    fi
done
}

# Checks if site is reachable with a HTTP 200 status
site_200() {
print_text_in_color "$ICyan" "Checking connection..."
        CURL_STATUS="$(curl -LI "${1}" -o /dev/null -w '%{http_code}\n' -s)"
        if [[ "$CURL_STATUS" = "200" ]]
        then
            return 0
        else
            print_text_in_color "$IRed" "curl didn't produce a 200 status, is ${1} reachable?"
            return 1
        fi
}

# Do a DNS lookup and compare the WAN address with the A record
domain_check_200() {
    print_text_in_color "$ICyan" "Doing a DNS lookup for ${1}..."
    install_if_not dnsutils

    # Try to resolve the domain with nslookup using $DNS as resolver
    if nslookup "${1}" "$INTERNET_DNS" >/dev/null 2>&1
    then
        print_text_in_color "$IGreen" "DNS seems correct when checking with nslookup!"
    else
        print_text_in_color "$IRed" "DNS lookup failed with nslookup."
        print_text_in_color "$IRed" "Please check your DNS settings! Maybe the domain isn't propagated?"
        print_text_in_color "$ICyan" "Please check https://www.whatsmydns.net/#A/${1} if the IP seems correct."
        nslookup "${1}" "$INTERNET_DNS"
        return 1
    fi

    # Is the DNS record same as the external IP address of the server?
    if dig +short "${1}" @resolver1.opendns.com | grep -q "$WANIP4"
    then
        print_text_in_color "$IGreen" "DNS seems correct when checking with dig!"
    else
    msg_box "DNS lookup failed with dig. The external IP ($WANIP4) \
address of this server is not the same as the A-record ($DIG).
Please check your DNS settings! Maybe the domain isn't propagated?
Please check https://www.whatsmydns.net/#A/${1} if the IP seems correct."

    msg_box "As you noticed your WAN IP and DNS record doesn't match. \
This can happen when using DDNS for example, or in some edge cases.
If you feel brave, or are sure that everything is setup correctly, \
then you can choose to skip this test in the next step.

You can always contact us for further support if you wish: \
https://shop.hanssonit.se/product/premium-support-per-30-minutes/"
        if ! yesno_box_no "Do you feel brave and want to continue?"
            then
            exit
        fi
    fi
}

# A function to set the systemd-resolved default DNS servers based on the
# current Internet facing interface. This is needed for docker interfaces
# that might not use the same DNS servers otherwise.
set_systemd_resolved_dns() {
local iface="$1"
local pattern="$iface(?:.|\n)*?DNS Servers: ((?:[0-9a-f.: ]|\n)*?)\s*(?=\n\S|\n.+: |$)"
local dnss
dnss=$( systemd-resolve --status | perl -0777 -ne "if ((\$v) = (/$pattern/)) {\$v=~s/(?:\s|\n)+/ /g;print \"\$v\n\";}" )
if [ -n "$dnss" ]
then
    sed -i "s/^#\?DNS=.*$/DNS=${dnss}/" /etc/systemd/resolved.conf
    systemctl restart systemd-resolved &>/dev/null
    sleep 1
fi
}

# A function to fetch a file with curl to a directory
# 1 = https://example.com
# 2 = name of file
# 3 = directory that the file should end up in
curl_to_dir() {
if [ ! -d "$3" ]
then
    mkdir -p "$3"
fi
    rm -f "$3"/"$2"
    curl -sfL "$1"/"$2" -o "$3"/"$2"
}

start_if_stopped() {
if ! pgrep "$1"
then
    print_text_in_color "$ICyan" "Starting $1..."
    check_command systemctl start "$1".service
fi
}

# Warn user that HTTP/2 will be disabled if installing app that use Apache2 PHP instead of PHP-FPM
# E.g: http2_warn Modsecurity
http2_warn() {
    msg_box "This VM has HTTP/2 enabled by default.

If you continue with installing $1, HTTP/2 will be disabled since it's not compatible with the mpm module used by $1.

This is what Apache will say in the error.log if you enable $1 anyway:
'The mpm module (prefork.c) is not supported by mod_http2.
The mpm determines how things are processed in your server.
HTTP/2 has more demands in this regard and the currently selected mpm will just not do.
This is an advisory warning. Your server will continue to work, but the HTTP/2 protocol will be inactive.'"

if ! yesno_box_yes "Do you really want to enable $1 anyway?"
then
    exit 1
fi
}

calculate_php_fpm() {
# Get current PHP version
check_php

# Minimum amount of max children (lower than this won't work with 2 GB RAM)
min_max_children=8
# If start servers are lower than this then it's likely that there are room for max_spare_servers
min_start_servers=20
# Maximum amount of children is only set if the min_start_servers value are met
min_max_spare_servers=35

# Calculate the sum of the current values
CURRENT_START="$(grep pm.start_servers "$PHP_POOL_DIR"/nextcloud.conf | awk '{ print $3}')"
CURRENT_MAX="$(grep pm.max_spare_servers "$PHP_POOL_DIR"/nextcloud.conf | awk '{ print $3}')"
CURRENT_MIN="$(grep pm.min_spare_servers "$PHP_POOL_DIR"/nextcloud.conf | awk '{ print $3}')"
CURRENT_SUM="$((CURRENT_START + CURRENT_MAX + CURRENT_MIN))"

# Calculate max_children depending on RAM
# Tends to be between 30-50MB per children
average_php_memory_requirement=50
available_memory=$(awk '/MemAvailable/ {printf "%d", $2/1024}' /proc/meminfo)
PHP_FPM_MAX_CHILDREN=$((available_memory/average_php_memory_requirement))

# Lowest possible value is 8
print_text_in_color "$ICyan" "Automatically configures pm.max_children for php-fpm..."
if [ $PHP_FPM_MAX_CHILDREN -lt $min_max_children ]
then
    msg_box "The current max_children value available to set is \
$PHP_FPM_MAX_CHILDREN, and with that value PHP-FPM won't function properly.
The minimum value is 8, and the value is calculated depening on how much RAM you have left to use in the system.

The absolute minimum amount of RAM required to run the VM is 2 GB, but we recomend 4 GB.

You now have two choices:
1. Import this VM again, raise the amount of RAM with at least 1 GB, and then run this script again,
   installing it in the same way as you did before.
2. Import this VM again without raising the RAM, but don't install any of the following apps:
   1) Collabora
   2) OnlyOffice
   3) Full Text Search

This script will now exit.
The installation was not successful, sorry for the inconvenience.

If you think this is a bug, please report it to $ISSUES"
exit 1
else
    check_command sed -i "s|pm.max_children.*|pm.max_children = $PHP_FPM_MAX_CHILDREN|g" "$PHP_POOL_DIR"/nextcloud.conf
    print_text_in_color "$IGreen" "pm.max_children was set to $PHP_FPM_MAX_CHILDREN"
    # Check if the sum of all the current values are more than $PHP_FPM_MAX_CHILDREN and only continue it is
    if [ $PHP_FPM_MAX_CHILDREN -gt $CURRENT_SUM ]
    then
        # Set pm.max_spare_servers
        if [ $PHP_FPM_MAX_CHILDREN -ge $min_max_spare_servers ]
        then
            if [ "$(grep pm.start_servers "$PHP_POOL_DIR"/nextcloud.conf | awk '{ print $3}')" -lt $min_start_servers ]
            then
                check_command sed -i "s|pm.max_spare_servers.*|pm.max_spare_servers = $((PHP_FPM_MAX_CHILDREN - 30))|g" "$PHP_POOL_DIR"/nextcloud.conf
                print_text_in_color "$IGreen" "pm.max_spare_servers was set to $((PHP_FPM_MAX_CHILDREN - 30))"
            fi
        fi
    fi
fi

# If $PHP_FPM_MAX_CHILDREN is lower than the current sum of all values, revert to default settings
if [ $PHP_FPM_MAX_CHILDREN -lt $CURRENT_SUM ]
then
    check_command sed -i "s|pm.max_children.*|pm.max_children = $PHP_FPM_MAX_CHILDREN|g" "$PHP_POOL_DIR"/nextcloud.conf
    check_command sed -i "s|pm.start_servers.*|pm.start_servers = 3|g" "$PHP_POOL_DIR"/nextcloud.conf
    check_command sed -i "s|pm.min_spare_servers.*|pm.min_spare_servers = 2|g" "$PHP_POOL_DIR"/nextcloud.conf
    check_command sed -i "s|pm.max_spare_servers.*|pm.max_spare_servers = 3|g" "$PHP_POOL_DIR"/nextcloud.conf
    print_text_in_color "$ICyan" "All PHP-INI values were set back to default values as the value for pm.max_children ($PHP_FPM_MAX_CHILDREN) was lower than the sum of all the current values ($CURRENT_SUM)"
    print_text_in_color "$ICyan" "Please run this again to set optimal values"
fi
restart_webserver
}

# Compatibility with older VMs
calculate_max_children() {
    calculate_php_fpm
}

test_connection() {
version(){
    local h t v

    [[ $2 = "$1" || $2 = "$3" ]] && return 0

    v=$(printf '%s\n' "$@" | sort -V)
    h=$(head -n1 <<<"$v")
    t=$(tail -n1 <<<"$v")

    [[ $2 != "$h" && $2 != "$t" ]]
}
if ! version 18.04 "$DISTRO" 20.04.6
then
    print_text_in_color "$IRed" "Your current Ubuntu version is $DISTRO but must be between \
18.04 - 20.04.4 to run this script."
    print_text_in_color "$ICyan" "Please contact us to get support for upgrading your server:"
    print_text_in_color "$ICyan" "https://www.hanssonit.se/#contact"
    print_text_in_color "$ICyan" "https://shop.hanssonit.se/"
    sleep 300
fi

# Install dnsutils if not existing
if ! dpkg-query -W -f='${Status}' "dnsutils" | grep -q "ok installed"
then
    apt update -q4 & spinner_loading && apt install dnsutils -y
fi
# Install net-tools if not existing
if ! dpkg-query -W -f='${Status}' "net-tools" | grep -q "ok installed"
then
    apt update -q4 & spinner_loading && apt install net-tools -y
fi
# After applying Netplan settings, try a DNS lookup.
# Restart systemd-networkd if this fails and try again.
# If this second check also fails, consider this a problem.
print_text_in_color "$ICyan" "Checking connection..."
netplan apply
sleep 2
if ! nslookup github.com
then
    print_text_in_color "$ICyan" "Trying to restart netplan service..."
    check_command systemctl restart systemd-networkd && sleep 2
    if ! nslookup github.com
    then
        msg_box "Network NOT OK. You must have a working network connection to run this script.
If you think that this is a bug, please report it to https://github.com/nextcloud/vm/issues."
        return 1
    fi
fi
print_text_in_color "$IGreen" "Online!"
return 0
}


# Check that the script can see the external IP (apache fails otherwise), used e.g. in the adminer app script.
check_external_ip() {
if [ -z "$WANIP4" ]
then
    print_text_in_color "$IRed" "WANIP4 is an emtpy value, Apache will fail on reboot due to this. \
Please check your network and try again."
    sleep 3
    exit 1
fi
}

# Check if Nextcloud is installed with TLS
check_nextcloud_https() {
    if ! nextcloud_occ_no_check config:system:get overwrite.cli.url | grep -q "https"
    then
        msg_box "Sorry, but Nextcloud needs to be run on HTTPS which doesn't seem to be the case here.
You easily activate TLS (HTTPS) by running the Let's Encrypt script.
More info here: https://bit.ly/37wRCin

To run this script again, just exectue 'sudo bash $SCRIPTS/menu.sh' and choose:
Additional Apps --> Documentserver --> $1."
        exit
    fi
}

restart_webserver() {
check_command systemctl restart apache2.service
if is_this_installed php"$PHPVER"-fpm
then
    check_command systemctl restart php"$PHPVER"-fpm.service
fi

}

# Install certbot (Let's Encrypt)
install_certbot() {
certbot --version 2> /dev/null
LE_IS_AVAILABLE=$?
if [ $LE_IS_AVAILABLE -eq 0 ]
then
    certbot --version 2> /dev/null
else
    print_text_in_color "$ICyan" "Installing certbot (Let's Encrypt)..."
    install_if_not snapd
    snap install certbot --classic
    # Update $PATH in current session (login and logout is required otherwise)
    check_command hash -r
fi
}

# Generate certs and configure it automatically
# https://certbot.eff.org/docs/using.html#certbot-command-line-options
generate_cert() {
uir_hsts=""
if [ -z "$SUBDOMAIN" ]
then
    uir_hsts="--uir --hsts"
fi
a2dissite 000-default.conf
systemctl reload apache2.service
default_le="--rsa-key-size 4096 --renew-by-default --no-eff-email --agree-tos $uir_hsts --server https://acme-v02.api.letsencrypt.org/directory -d $1"
#http-01
local  standalone="certbot certonly --standalone --pre-hook \"systemctl stop apache2.service\" --post-hook \"systemctl start apache2.service\" $default_le"
#tls-alpn-01
local  tls_alpn_01="certbot certonly --preferred-challenges tls-alpn-01 $default_le"
#dns
local  dns="certbot certonly --manual --manual-public-ip-logging-ok --preferred-challenges dns $default_le"
local  methods=(standalone dns)

for f in ${methods[*]}
do
    print_text_in_color "${ICyan}" "Trying to generate certs and validate them with $f method."
    current_method=""
    eval current_method="\$$f"
    if eval "$current_method"
    then
        return 0
    elif [ "$f" != "${methods[$((${#methods[*]} - 1))]}" ]
    then
        msg_box "It seems like no certs were generated when trying \
to validate them with the $f method. We will do more tries."
    else
        msg_box "It seems like no certs were generated when trying \
to validate them with the $f method. We have tried all the methods. Please check your DNS and try again."
        return 1;
    fi
done
}

# Last message depending on with script that is being run when using the generate_cert() function
last_fail_tls() {
    msg_box "All methods failed. :/

You can run the script again by executing: sudo bash $SCRIPTS/menu.sh
Please try to run it again some other time with other settings.

There are different configs you can try in Let's Encrypt's user guide:
https://letsencrypt.readthedocs.org/en/latest/index.html
Please check the guide for further information on how to enable TLS.

This script is developed on GitHub, feel free to contribute:
https://github.com/nextcloud/vm"

if [ -n "$2" ]
then
    msg_box "The script will now do some cleanup and revert the settings."
    # Cleanup
    snap remove certbot
    rm -f "$SCRIPTS"/test-new-config.sh
fi

# Restart webserver services
restart_webserver
}

# Use like this: open_port 443 TCP
# or e.g. open_port 3478 UDP
open_port() {
    install_if_not miniupnpc
    print_text_in_color "$ICyan" "Trying to open port $1 automatically..."
    if ! upnpc -a "$ADDRESS" "$1" "$1" "$2" &>/dev/null
    then
        msg_box "Failed to open port $1 $2 automatically. You have to do this manually."
        FAIL=1
    fi
}

cleanup_open_port() {
    if [ -n "$FAIL" ]
    then
        apt-get purge miniupnpc -y
        apt autoremove -y
    fi
}

# Check if port is open # check_open_port 443 domain.example.com
check_open_port() {
print_text_in_color "$ICyan" "Checking if port ${1} is open with https://www.networkappers.com/tools/open-port-checker..."
install_if_not curl
# WAN Adress
if check_command curl -s -H 'Cache-Control: no-cache' -H 'Referer: https://www.networkappers.com/tools/open-port-checker' "https://networkappers.com/api/port.php?ip=${WANIP4}&port=${1}" | grep -q "open"
then
    print_text_in_color "$IGreen" "Port ${1} is open on ${WANIP4}!"
# Domain name
elif check_command curl -s -H 'Cache-Control: no-cache' -H 'Referer: https://www.networkappers.com/tools/open-port-checker' "https://www.networkappers.com/api/port.php?ip=${2}&port=${1}" | grep -q "open"
then
    print_text_in_color "$IGreen" "Port ${1} is open on ${2}!"
else
    msg_box "It seems like the port ${1} is closed. This could happend when your
ISP has blocked the port, or that the port isn't open.

If you are 100% sure the port ${1} is open you can now choose to
continue. There are no guarantees that it will work anyway though,
since the service depend on that the port ${1} is open and
accessible from outside your network."
    if ! yesno_box_no "Are you 100% sure the port ${1} is open?"
    then
        msg_box "Port $1 is not open on either ${WANIP4} or ${2}.
        
Please follow this guide to open ports in your router or firewall:\nhttps://www.techandme.se/open-port-80-443/"
        any_key "Press any key to exit..."
        exit 1
    fi
fi
}

check_distro_version() {
# Check Ubuntu version
if lsb_release -sc | grep -ic "bionic" &> /dev/null || lsb_release -sc | grep -ic "focal" &> /dev/null
then
    OS=1
elif lsb_release -i | grep -ic "Ubuntu" &> /dev/null
then
    OS=1
elif uname -a | grep -ic "bionic" &> /dev/null || uname -a | grep -ic "focal" &> /dev/null
then
    OS=1
elif uname -v | grep -ic "Ubuntu" &> /dev/null
then
    OS=1
fi

if [ "$OS" != 1 ]
then
    msg_box "Ubuntu Server is required to run this script.
Please install that distro and try again.

You can find the download link here: https://www.ubuntu.com/download/server"
    exit 1
fi

if ! version 18.04 "$DISTRO" 20.04.4; then
    msg_box "Your current Ubuntu version is $DISTRO but must be between 18.04 - 20.04.4 to run this script."
    msg_box "Please contact us to get support for upgrading your server:
https://www.hanssonit.se/#contact
https://shop.hanssonit.se/"
    exit 1
fi
}

# Check if program is installed (stop_if_installed apache2)
stop_if_installed() {
if [ "$(dpkg-query -W -f='${Status}' "${1}" 2>/dev/null | grep -c "ok installed")" == "1" ]
then
    print_text_in_color "$IRed" "${1} is installed, it must be a clean server."
    exit 1
fi
}

# Check if program is installed (is_this_installed apache2)
is_this_installed() {
if dpkg-query -W -f='${Status}' "${1}" | grep -q "ok installed"
then
    return 0
else
    return 1
fi
}

# Install_if_not program
install_if_not() {
if ! dpkg-query -W -f='${Status}' "${1}" | grep -q "ok installed"
then
    apt update -q4 & spinner_loading && RUNLEVEL=1 apt install "${1}" -y
fi
}

# Test RAM size
# Call it like this: ram_check [amount of min RAM in GB] [for which program]
# Example: ram_check 2 Nextcloud
ram_check() {
install_if_not bc
mem_available="$(awk '/MemTotal/{print $2}' /proc/meminfo)"
mem_available_gb="$(printf '%0.2f\n' "$(echo "scale=3; $mem_available/(1024*1024)" | bc)")"
mem_required="$((${1}*(924*1024)))" # 100MiB/GiB margin and allow 90% to be able to run on physical machines
if [ "${mem_available}" -lt "${mem_required}" ]
then
    print_text_in_color "$IRed" "Error: ${1} GB RAM required to install ${2}!" >&2
    print_text_in_color "$IRed" "Current RAM is: ($mem_available_gb GB)" >&2
    sleep 3
    msg_box "** Error: insufficient memory. ${mem_available_gb}GB RAM installed, ${1}GB required.

To bypass this check, comment out (add # before the line) 'ram_check X' in the script that you are trying to run.

In nextcloud_install_production.sh you can find the check somewhere around line #98.

Please note that things may be very slow and not work as expected. YOU HAVE BEEN WARNED!"
    exit 1
else
    print_text_in_color "$IGreen" "RAM for ${2} OK! ($mem_available_gb GB)"
fi
}

# Test number of CPU
# Call it like this: cpu_check [amount of min CPU] [for which program]
# Example: cpu_check 2 Nextcloud
cpu_check() {
nr_cpu="$(nproc)"
if [ "${nr_cpu}" -lt "${1}" ]
then
    print_text_in_color "$IRed" "Error: ${1} CPU required to install ${2}!" >&2
    print_text_in_color "$IRed" "Current CPU: ($((nr_cpu)))" >&2
    sleep 3
    exit 1
else
    print_text_in_color "$IGreen" "CPU for ${2} OK! ($((nr_cpu)))"
fi
}

check_command() {
if ! "$@";
then
    print_text_in_color "$ICyan" "Sorry but something went wrong. Please report \
this issue to $ISSUES and include the output of the error message. Thank you!"
    print_text_in_color "$IRed" "$* failed"
    if nextcloud_occ_no_check -V > /dev/null
    then
        notify_admin_gui \
        "Sorry but something went wrong. Please report this issue to \
$ISSUES and include the output of the error message. Thank you!" \
        "$* failed"
    fi
    exit 1
fi
}

# Example: nextcloud_occ 'maintenance:mode --on'
nextcloud_occ() {
check_command sudo -u www-data php "$NCPATH"/occ "$@";
}

# Example: nextcloud_occ_no_check 'maintenance:mode --on'
nextcloud_occ_no_check() {
sudo -u www-data php "$NCPATH"/occ "$@";
}

# Backwards compatibility (2020-10-08)
occ_command() {
nextcloud_occ "$@";
}

occ_command_no_check() {
nextcloud_occ_no_check "$@";
}

network_ok() {
version(){
    local h t v

    [[ $2 = "$1" || $2 = "$3" ]] && return 0

    v=$(printf '%s\n' "$@" | sort -V)
    h=$(head -n1 <<<"$v")
    t=$(tail -n1 <<<"$v")

    [[ $2 != "$h" && $2 != "$t" ]]
}
if version 18.04 "$DISTRO" 20.04.6
then
    print_text_in_color "$ICyan" "Testing if network is OK..."
    if ! netplan apply
    then
        systemctl restart systemd-networkd > /dev/null
    fi
    # Check the connention
    countdown 'Waiting for network to restart...' 3
    if ! site_200 github.com
    then
        # sleep 10 seconds so that some slow networks have time to restart
        countdown 'Not online yet, waiting a bit more...' 10
        if ! site_200 github.com
        then
            # sleep 30 seconds so that some REALLY slow networks have time to restart
            countdown 'Not online yet, waiting a bit more (last try)...' 30
            site_200 github.com
        fi
    fi
else
    msg_box "Your current Ubuntu version is $DISTRO but must be between 18.04 - 20.04.6 to run this script."
    msg_box "Please contact us to get support for upgrading your server:
https://www.hanssonit.se/#contact
https://shop.hanssonit.se/"
    msg_box "We will now pause for 60 seconds. Please press CTRL+C when prompted to do so."
    countdown "Please press CTRL+C to abort..." 60
fi
}

# Whiptail auto-size
calc_wt_size() {
    WT_HEIGHT=17
    WT_WIDTH=$(tput cols)

    if [ -z "$WT_WIDTH" ] || [ "$WT_WIDTH" -lt 60 ]; then
        WT_WIDTH=80
    fi
    if [ "$WT_WIDTH" -gt 178 ]; then
        WT_WIDTH=120
    fi
    WT_MENU_HEIGHT=$((WT_HEIGHT-7))
    export WT_MENU_HEIGHT
}

# example: is_app_enabled documentserver_community
is_app_enabled() {
if nextcloud_occ app:list | sed '/Disabled/,$d' | awk '{print$2}' | tr -d ':' | sed '/^$/d' | grep -q "^$1$"
then
    return 0
else
    return 1
fi
}

#example: is_app_installed documentserver_community
is_app_installed() {
if [ -d "$NC_APPS_PATH/$1" ]
then
    return 0
else
    return 1
fi
}

install_and_enable_app() {
# Download and install $1
if ! is_app_installed "$1"
then
    print_text_in_color "$ICyan" "Installing $1..."
    # nextcloud_occ not possible here because it uses check_command and will exit if nextcloud_occ fails
    installcmd="$(nextcloud_occ_no_check app:install "$1")"
    if grep 'not compatible' <<< "$installcmd"
    then
    msg_box "The $1 app could not be installed.
It's probably not compatible with $(nextcloud_occ -V).

You can try to install the app manually after the script has finished,
or when a new version of the app is released with the following command:

'sudo -u www-data php ${NCPATH}/occ app:install $1'"
    rm -Rf "$NCPATH/apps/$1"
    else
        # Enable $1
        if is_app_installed "$1"
        then
            nextcloud_occ app:enable "$1"
            chown -R www-data:www-data "$NC_APPS_PATH"
        fi
    fi
else
    print_text_in_color "$ICyan" "It seems like $1 is installed already, trying to enable it..."
    nextcloud_occ_no_check app:enable "$1"
fi
}

download_verify_nextcloud_stable() {
# Check the current Nextcloud version
while [ -z "$NCVERSION" ]
do
    print_text_in_color "$ICyan" "Fetching the latest Nextcloud version..."
    NCVERSION=$(curl -s -m 900 $NCREPO/ | sed --silent 's/.*href="nextcloud-\([^"]\+\).zip.asc".*/\1/p' | sort --version-sort | tail -1)
    STABLEVERSION="nextcloud-$NCVERSION"
    print_text_in_color "$IGreen" "$NCVERSION"
done

# Download the file
rm -f "$HTML/$STABLEVERSION.tar.bz2"
cd $HTML
print_text_in_color "$ICyan" "Downloading $STABLEVERSION..."
if network_ok
then
    curl -fSLO --retry 3 "$NCREPO"/"$STABLEVERSION".tar.bz2
else
    msg_box "There seems to be an issue with your network, please try again later.\nThis script will exit."
    exit 1
fi
# Checksum of the downloaded file
print_text_in_color "$ICyan" "Checking SHA256 checksum..."
mkdir -p "$SHA256_DIR"
curl_to_dir "$NCREPO" "$STABLEVERSION.tar.bz2.sha256" "$SHA256_DIR"
SHA256SUM="$(tail "$SHA256_DIR"/"$STABLEVERSION".tar.bz2.sha256 | awk '{print$1}')"
if ! echo "$SHA256SUM" "$STABLEVERSION.tar.bz2" | sha256sum -c
then
    msg_box "The SHA256 checksums of $STABLEVERSION.tar.bz2 didn't match, please try again."
    exit 1
fi
# integrity of the downloaded file
print_text_in_color "$ICyan" "Checking GPG integrity..."
install_if_not gnupg
mkdir -p "$GPGDIR"
curl_to_dir "$NCREPO" "$STABLEVERSION.tar.bz2.asc" "$GPGDIR"
chmod -R 600 "$GPGDIR"
gpg --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys "$OpenPGP_fingerprint"
gpg --verify "$GPGDIR/$STABLEVERSION.tar.bz2.asc" "$HTML/$STABLEVERSION.tar.bz2"
rm -r "$SHA256_DIR"
rm -r "$GPGDIR"
rm -f releases
}

# call like: download_script folder_variable name_of_script
# e.g. download_script MENU additional_apps
# Use it for functions like download_static_script
download_script() {
    rm -f "${SCRIPTS}/${2}.sh" "${SCRIPTS}/${2}.php" "${SCRIPTS}/${2}.py"
    if ! { curl_to_dir "${!1}" "${2}.sh" "$SCRIPTS" || curl_to_dir "${!1}" "${2}.php" "$SCRIPTS" || curl_to_dir "${!1}" "${2}.py" "$SCRIPTS"; }
    then
        print_text_in_color "$IRed" "{$2} failed to download."
        sleep 2
        if ! yesno_box_yes "Are you running the first setup of this server?"
        then
            msg_box "Please run sudo bash '$SCRIPTS/update.sh' \
from your CLI to get the latest scripts from Github, needed for a successful run."
        else
            msg_box "If you get this error when running the first setup script, \
then just re-run it with: 'sudo bash $SCRIPTS/nextcloud-startup-script.sh' \
from your CLI, and all the scripts will be downloaded again.

If it still fails, please report this issue to: $ISSUES."
        fi
        exit 1
    fi
}

# call like: run_script folder_variable name_of_script
# e.g. run_script MENU additional_apps
# Use it for functions like run_script STATIC
run_script() {
    rm -f "${SCRIPTS}/${2}.sh" "${SCRIPTS}/${2}.php" "${SCRIPTS}/${2}.py"
    if download_script "${1}" "${2}"
    then
        if [ -f "${SCRIPTS}/${2}".sh ]
        then
            bash "${SCRIPTS}/${2}.sh"
            rm -f "${SCRIPTS}/${2}.sh"
        elif [ -f "${SCRIPTS}/${2}".php ]
        then
            php "${SCRIPTS}/${2}.php"
            rm -f "${SCRIPTS}/${2}.php"
        elif [ -f "${SCRIPTS}/${2}".py ]
        then
            install_if_not python3
            python3 "${SCRIPTS}/${2}.py"
            rm -f "${SCRIPTS}/${2}.py"
        fi
    else
        print_text_in_color "$IRed" "Running ${2} failed"
        print_text_in_color "$ICyan" "Script failed to execute. Please run: \
'sudo curl -sLO ${!1}/${2}.sh|php|py' and try again."
        exit 1
    fi
}

# Run any script in ../master
# call like: run_main_script name_of_script
run_main_script() {
run_script GITHUB_REPO "${1}"
}

version(){
    local h t v

    [[ $2 = "$1" || $2 = "$3" ]] && return 0

    v=$(printf '%s\n' "$@" | sort -V)
    h=$(head -n1 <<<"$v")
    t=$(tail -n1 <<<"$v")

    [[ $2 != "$h" && $2 != "$t" ]]
}

version_gt() {
    local v1 v2 IFS=.
    read -ra v1 <<< "$1"
    read -ra v2 <<< "$2"
    printf -v v1 %03d "${v1[@]}"
    printf -v v2 %03d "${v2[@]}"
    [[ $v1 > $v2 ]]
}

spinner_loading() {
    pid=$!
    spin='-\|/'
    i=0
    while kill -0 $pid 2>/dev/null
    do
        i=$(( (i+1) %4 ))
        printf "\r[${spin:$i:1}] " # Add text here, something like "Please be paitent..." maybe?
        sleep .1
    done
}

any_key() {
    local PROMPT="$1"
    read -r -sn 1 -p "$(printf "%b" "${IGreen}${PROMPT}${Color_Off}")";echo
}

lowest_compatible_nc() {
if [ -z "$NCVERSION" ]
then
    nc_update
fi
if [ "${CURRENTVERSION%%.*}" -lt "$1" ]
then
    msg_box "This script is developed to work with Nextcloud $1 and later.
This means we can't use our own script for now. But don't worry,
we automated the update process and we will now use Nextclouds updater instead.

Press [OK] to continue the update, or press [CTRL+C] to abort.

If you are using Nextcloud $1 and later and still see this message,
or experience other issues then please report this to $ISSUES"

    # Download the latest updater
#    cd $NCPATH
#    curl sLO https://github.com/nextcloud/updater/archive/master.zip
#    install_if_not unzip
#    unzip -q master.zip
#    rm master.zip*
#    rm updater/ -R
#    mv updater-master/ updater/
#    download_script STATIC setup_secure_permissions_nextcloud -P $SCRIPTS
#    bash $SECURE
#    cd

    # Do the upgrade
    chown -R www-data:www-data "$NCPATH"
    rm -rf "$NCPATH"/assets
    yes | sudo -u www-data php /var/www/nextcloud/updater/updater.phar
    download_script STATIC setup_secure_permissions_nextcloud -P $SCRIPTS
    bash $SECURE
    nextcloud_occ maintenance:mode --off
fi

# Check new version
# shellcheck source=lib.sh
if [ -z "$NCVERSION" ]
then
    nc_update
fi
if [ "${CURRENTVERSION%%.*}" -ge "$1" ]
then
    sleep 1
else
    msg_box "Your current version are still not compatible with the version required to run this script.

To upgrade between major versions, please check this out:
https://shop.hanssonit.se/product/upgrade-between-major-owncloud-nextcloud-versions/"
    nextcloud_occ -V
    exit
fi
}

# Check universe reposiroty
check_universe() {
UNIV=$(apt-cache policy | grep http | awk '{print $3}' | grep universe | head -n 1 | cut -d "/" -f 2)
if [ "$UNIV" != "universe" ]
then
    print_text_in_color "$ICyan" "Adding required repo (universe)."
    add-apt-repository universe
fi
}

# Check universe reposiroty
check_multiverse() {
MULTIV=$(apt-cache policy | grep http | awk '{print $3}' | grep multiverse | head -n 1 | cut -d "/" -f 2)
if [ "$MULTIV" != "multiverse" ]
then
    print_text_in_color "$ICyan" "Adding required repo (multiverse)."
    add-apt-repository multiverse
fi
}

set_max_count() {
if grep -F 'vm.max_map_count=262144' /etc/sysctl.conf ; then
    print_text_in_color "$ICyan" "Max map count already set, skipping..."
else
    sysctl -w vm.max_map_count=262144
    {
        echo "###################################################################"
        echo "# Docker ES max virtual memory"
        echo "vm.max_map_count=262144"
    } >> /etc/sysctl.conf
fi
}

# Check if docker is installed
is_docker_running() {
    docker ps -a > /dev/null 2>&1
}

# Check if specific docker image is present
is_image_present() {
    [[ $(docker images -q "$1") ]]
}

# Check if old docker exists
# FULL NAME e.g. ark74/nc_fts or containrrr/watchtower or collabora/code
does_this_docker_exist() {
is_docker_running && is_image_present "$1";
}

install_docker() {
if ! is_docker_running
then
    is_process_running dpkg
    is_process_running apt
    print_text_in_color "$ICyan" "Installing Docker CE..."
    apt update -q4 & spinner_loading
    install_if_not curl
    curl -fsSL get.docker.com | sh
fi
# Set overlay2
cat << OVERLAY2 > /etc/docker/daemon.json
{
  "storage-driver": "overlay2"
}
OVERLAY2
systemctl daemon-reload
systemctl restart docker.service
}

# Remove all dockers excluding one
# docker_prune_except_this fts_esror 'Full Text Search'
docker_prune_except_this() {
print_text_in_color "$ICyan" "Checking if there are any old images and removing them..."
DOCKERPS=$(docker ps -a | grep -v "$1" | awk 'NR>1 {print $1}')
if [ "$DOCKERPS" != "" ]
then
    msg_box "Removing old Docker instance(s)... ($DOCKERPS)

Please note that we will not remove $1 ($2).

You will be given the option to abort when you hit OK."
    any_key "Press any key to continue. Press CTRL+C to abort"
    docker stop "$(docker ps -a | grep -v "$1" | awk 'NR>1 {print $1}')"
    docker container prune -f
    docker image prune -a -f
    docker volume prune -f
fi
}

# Remove selected Docker image
# docker_prune_this 'collabora/code' 'onlyoffice/documentserver' 'ark74/nc_fts'
docker_prune_this() {
if does_this_docker_exist "$1"
then
    msg_box "Removing old Docker image: $1
You will be given the option to abort when you hit OK."
    any_key "Press any key to continue. Press CTRL+C to abort"
    docker stop "$(docker container ls | grep "$1" | awk '{print $1}' | tail -1)"
    docker container prune -f
    docker image prune -a -f
    docker volume prune -f
fi
}


# Update specific Docker image
# docker_update_specific bitwarden_rs Bitwarden RS (actual docker image = $1, the name in text = $2
docker_update_specific() {
if does_this_docker_exist "$1" "$2"
then
    docker run --rm --name temporary_watchtower -v /var/run/docker.sock:/var/run/docker.sock containrrr/watchtower --cleanup --run-once "$1"
    print_text_in_color "$IGreen" "$2 docker image just got updated!"
    echo "Docker image just got updated! We just updated $2 docker image automatically! $(date +%Y%m%d)" >> "$VMLOGS"/update.log
fi
}

# countdown 'message looks like this' 10
countdown() {
print_text_in_color "$ICyan" "$1"
secs="$(($2))"
while [ $secs -gt 0 ]; do
   echo -ne "$secs\033[0K\r"
   sleep 1
   : $((secs--))
done
}

print_text_in_color() {
printf "%b%s%b\n" "$1" "$2" "$Color_Off"
}

# Apply patch
# git_apply_patch 15992 server 16.0.2
# 1 = pull
# 2 = repository
# Nextcloud version
git_apply_patch() {
if [ -z "$NCVERSION" ]
then
    nc_update
fi
if [[ "$CURRENTVERSION" = "$3" ]]
then
    curl_to_dir "https://patch-diff.githubusercontent.com/raw/nextcloud/${2}/pull" "${1}.patch" "/tmp"
    install_if_not git
    cd "$NCPATH"
    if git apply --check /tmp/"${1}".patch >/dev/null 2>&1
    then
        print_text_in_color "$IGreen" "Applying patch https://github.com/nextcloud/${2}/pull/${1} ..."
        git apply /tmp/"${1}".patch
    fi
fi
}

# Check if it's the Home/SME Server

# if home_sme_server
# then
#    do something
# fi
home_sme_server() {
# OLD DISKS: "Samsung SSD 860" || ST5000LM000-2AN1  || ST5000LM015-2E81
# OLD MEMORY: BLS16G4 (Balistix Sport) || 18ASF2G72HZ (ECC)
if lshw -c system | grep -q "NUC8i3BEH\|NUC10i3FNH"
then
    if lshw -c memory | grep -q "BLS16G4\|18ASF2G72HZ\|16ATF2G64HZ\|CT16G4SFD8266\|M471A4G43MB1"
    then
        if lshw -c disk | grep -q "ST2000LM015-2E81\|WDS400\|ST5000LM000-2AN1\|ST5000LM015-2E81\|Samsung SSD 860\|WDS500G1R0B"
        then
            NEXTCLOUDHOMESME=yes-this-is-the-home-sme-server
        fi
    fi
fi

if [ -n "$NEXTCLOUDHOMESME" ]
then
    return 0
else
    return 1
fi
}

# Check if the value is a number
# EXAMPLE: https://github.com/nextcloud/vm/pull/1012
check_if_number() {
case "${1}" in
    ''|*[!0-9]*) return 1 ;;
    *) return 0 ;;
esac
}

# Example:
# notify_admin_gui \
# "Subject" \
# "Message"
#
# nextcloud_occ_no_check notification:generate -l "$2" "$admin" "$1"
notify_admin_gui() {
local NC_USERS
local user
local admin
if ! is_app_enabled notifications
then
    print_text_in_color "$IRed" "The notifications app isn't enabled - unable to send notifications"
    return 1
fi

print_text_in_color "$ICyan" "Posting notification to users that are admins, this might take a while..."
send_mail "$1" "$2"
if [ -z "${NC_ADMIN_USER[*]}" ]
then
    NC_USERS=$(nextcloud_occ_no_check user:list | sed 's|^  - ||g' | sed 's|:.*||')
    mapfile -t NC_USERS <<< "$NC_USERS"
    for user in "${NC_USERS[@]}"
    do
        if nextcloud_occ_no_check user:info "$user" | cut -d "-" -f2 | grep -x -q " admin"
        then
            NC_ADMIN_USER+=("$user")
        fi
    done
fi

for admin in "${NC_ADMIN_USER[@]}"
do
    print_text_in_color "$IGreen" "Posting '$1' to: $admin"
    nextcloud_occ_no_check notification:generate -l "$2" "$admin" "$1"
done
}

# Use this to send system mails
# e.g.: send_mail "subject" "text"
send_mail() {
    local RECIPIENT
    if [ -f /etc/msmtprc ]
    then
        RECIPIENT=$(grep "recipient=" /etc/msmtprc)
        RECIPIENT="${RECIPIENT##*recipient=}"
        if [ -n "$RECIPIENT" ]
        then
            print_text_in_color "$ICyan" "Sending '$1' to $RECIPIENT"
            echo -e "$2" | mail --subject "NcVM - $1" "$RECIPIENT"
        fi
    fi
}

zpool_import_if_missing() {
# ZFS needs to be installed
if ! is_this_installed zfsutils-linux
then
    print_text_in_color "$IRed" "This function is only intened to be run if you have ZFS installed."
    return 1
elif [ -z "$POOLNAME" ]
then
    print_text_in_color "$IRed" "It seems like the POOLNAME variable is empty, we can't continue without it."
    return 1
fi
# Import zpool in case missing
if ! zpool list "$POOLNAME" >/dev/null 2>&1
then
    zpool import -f "$POOLNAME"
fi
# Check if UUID is used
if zpool list -v | grep sdb
then
    # Get UUID
    check_command partprobe -s
    if fdisk -l /dev/sdb1 >/dev/null 2>&1
    then
        UUID_SDB1=$(blkid -o value -s UUID /dev/sdb1)
    fi
    # Export / import the correct way (based on UUID)
    check_command zpool export "$POOLNAME"
    check_command zpool import -d /dev/disk/by-uuid/"$UUID_SDB1" "$POOLNAME"
fi
}

# Check for free space on the ubuntu-vg
check_free_space() {
    if vgs &>/dev/null
    then
        FREE_SPACE=$(vgs | grep ubuntu-vg | awk '{print $7}' | grep g | grep -oP "[0-9]+\.[0-9]" | sed 's|\.||')
    fi
    if [ -z "$FREE_SPACE" ]
    then
        FREE_SPACE=0
    fi
}

# Check if snapshotname already exists
does_snapshot_exist() {
    local SNAPSHOTS
    local snapshot
    if lvs &>/dev/null
    then
        SNAPSHOTS="$(lvs | grep ubuntu-vg | awk '{print $1}' | grep -v ubuntu-lv)"
    fi
    if [ -z "$SNAPSHOTS" ]
    then
        return 1
    fi
    mapfile -t SNAPSHOTS <<< "$SNAPSHOTS"
    for snapshot in "${SNAPSHOTS[@]}"
    do
        if [ "$snapshot" = "$1" ]
        then
            return 0
        fi
    done
    return 1
}

check_php() {
print_text_in_color "$ICyan" "Getting current PHP-version..."
GETPHP="$(php -v | grep -m 1 PHP | awk '{print $2}' | cut -d '-' -f1)"

if [ -z "$GETPHP" ]
then
    print_text_in_color "$IRed" "Can't find proper PHP version, aborting..."
    exit 1
fi

if grep 7.0 <<< "$GETPHP" >/dev/null 2>&1
then
   export PHPVER=7.0
elif grep 7.1 <<< "$GETPHP" >/dev/null 2>&1
then
   export PHPVER=7.1
elif grep 7.2 <<< "$GETPHP" >/dev/null 2>&1
then
   export PHPVER=7.2
elif grep 7.3 <<< "$GETPHP" >/dev/null 2>&1
then
   export PHPVER=7.3
elif grep 7.4 <<< "$GETPHP" >/dev/null 2>&1
then
   export PHPVER=7.4
#elif grep 8.0 <<< "$GETPHP" >/dev/null 2>&1
#then
#   export PHPVER=8.0
fi

export PHP_INI=/etc/php/"$PHPVER"/fpm/php.ini
export PHP_POOL_DIR=/etc/php/"$PHPVER"/fpm/pool.d

print_text_in_color "$IGreen" PHPVER="$PHPVER"
}

add_dockerprune() {
print_text_in_color "$ICyan" "Adding cronjob for Docker weekly prune..."
if ! crontab -u root -l | grep -q 'dockerprune.sh'
then
    mkdir -p "$SCRIPTS"
    crontab -u root -l | { cat; echo "@weekly $SCRIPTS/dockerprune.sh"; } | crontab -u root -
    check_command echo "#!/bin/bash" > "$SCRIPTS/dockerprune.sh"
    check_command echo "docker system prune -a --force" >> "$SCRIPTS/dockerprune.sh"
    check_command echo "exit" >> "$SCRIPTS/dockerprune.sh"
    chmod a+x "$SCRIPTS"/dockerprune.sh
    print_text_in_color "$IGreen" "Docker automatic prune job added."
fi
}

## bash colors
# Reset
Color_Off='\e[0m'       # Text Reset

# Regular Colors
Black='\e[0;30m'        # Black
Red='\e[0;31m'          # Red
Green='\e[0;32m'        # Green
Yellow='\e[0;33m'       # Yellow
Blue='\e[0;34m'         # Blue
Purple='\e[0;35m'       # Purple
Cyan='\e[0;36m'         # Cyan
White='\e[0;37m'        # White

# Bold
BBlack='\e[1;30m'       # Black
BRed='\e[1;31m'         # Red
BGreen='\e[1;32m'       # Green
BYellow='\e[1;33m'      # Yellow
BBlue='\e[1;34m'        # Blue
BPurple='\e[1;35m'      # Purple
BCyan='\e[1;36m'        # Cyan
BWhite='\e[1;37m'       # White

# Underline
UBlack='\e[4;30m'       # Black
URed='\e[4;31m'         # Red
UGreen='\e[4;32m'       # Green
UYellow='\e[4;33m'      # Yellow
UBlue='\e[4;34m'        # Blue
UPurple='\e[4;35m'      # Purple
UCyan='\e[4;36m'        # Cyan
UWhite='\e[4;37m'       # White

# Background
On_Black='\e[40m'       # Black
On_Red='\e[41m'         # Red
On_Green='\e[42m'       # Green
On_Yellow='\e[43m'      # Yellow
On_Blue='\e[44m'        # Blue
On_Purple='\e[45m'      # Purple
On_Cyan='\e[46m'        # Cyan
On_White='\e[47m'       # White

# High Intensity
IBlack='\e[0;90m'       # Black
IRed='\e[0;91m'         # Red
IGreen='\e[0;92m'       # Green
IYellow='\e[0;93m'      # Yellow
IBlue='\e[0;94m'        # Blue
IPurple='\e[0;95m'      # Purple
ICyan='\e[0;96m'        # Cyan
IWhite='\e[0;97m'       # White

# Bold High Intensity
BIBlack='\e[1;90m'      # Black
BIRed='\e[1;91m'        # Red
BIGreen='\e[1;92m'      # Green
BIYellow='\e[1;93m'     # Yellow
BIBlue='\e[1;94m'       # Blue
BIPurple='\e[1;95m'     # Purple
BICyan='\e[1;96m'       # Cyan
BIWhite='\e[1;97m'      # White

# High Intensity backgrounds
On_IBlack='\e[0;100m'   # Black
On_IRed='\e[0;101m'     # Red
On_IGreen='\e[0;102m'   # Green
On_IYellow='\e[0;103m'  # Yellow
On_IBlue='\e[0;104m'    # Blue
On_IPurple='\e[0;105m'  # Purple
On_ICyan='\e[0;106m'    # Cyan
On_IWhite='\e[0;107m'   # White