mirrortodevice

#!/bin/bash
# Caution, do not run unless you already have a backup you trust.
# I run this on my machine and I trust it.
# You should not trust a new backup plan unless you've not only
# used it to backup, but also to do a successful restore.
# This works for me, but it might not work for you.
# I run Mint Mate with a standard two partition install. If you've done custom partitioning (separate home/swap/etc partitions)
# it won't work for you. I made an attempt to assess whether it will work for you or not but, not guarantees)
# Use at your own risk, I'm only an amateur, I mess up sometimes.
# That said, it works for me. Feel free to try it. (maybe try cloning to USB first?)
#

if [ "$(id -u)" != "0" ]; then
  exec sudo "$0" "$@"
fi

user="$SUDO_USER"
hostname=$(hostname)
skipcheck="$1"

main () {
    determinesource;
    if [ "$skipcheck" == "skipcheck" ]; then
        echo "Do not check the source requested so skipping"
    else
        checksource;
        echo "Checking source"
    fi
    gettarget;
    checktarget;
    askifformatdesired;
    if [[ $formatRequested == "y" ]]; then
        doformat;
    else
        echo "skipping format";
    fi
    stopservices;
    doclone;
    restartservices;
    fixgrub;
}

#*************************determinesource******************************
determinesource () {
     slashmountedonpartition=$(mount | grep " / " | awk '{print $1}')

    if [[ $slashmountedonpartition == *"nvme"* ]]; then
        sourcedevice=${slashmountedonpartition::-2}
     else
        sourcedevice=${slashmountedonpartition::-1}
    fi
}
#***********************end determinesource****************************

#***********************checksource****************************
checksource () {
numpartitions=$(lsblk -nlpo NAME,TYPE $sourcedevice | awk '$2=="part"{print $1}' | wc -l)

if [ $numpartitions != 2 ]; then
    echo "Sorry, this script only works with 2 specific partitions"
    echo  "Partition #1 must be exactly \"EFI System\""
    echo "Partition #2 must be exactly \"Linux filesystem\""
    exit 1
fi

if [[ $sourcedevice == *"nvme"* ]]; then
    efipartition="$sourcedevice"p1
    mainpartition="$sourcedevice"p2
else
    efipartition="$sourcedevice"1
    mainpartition="$sourcedevice"2
fi

efishort=$(echo $efipartition | awk -F'/' '{print $3}')
mainshort=$(echo $mainpartition | awk -F'/' '{print $3}')


#echo "efishort is: $efishort"

part1type=$(lsblk -o name,parttypename | grep $efishort | awk -F "$efishort" '{print $2}' | sed 's/^[[:space:]]*//')

part2type=$(lsblk -o name,parttypename | grep $mainshort | awk -F "$mainshort" '{print $2}' | sed 's/^[[:space:]]*//')

if [[ $part1type != "EFI System"  || $part2type != "Linux filesystem" ]]; then
    echo "Sorry, partitions are wrong type"
    echo "Partition #1 must be exactly \"EFI System\""
    echo "Partition #2 must be exactly \"Linux filesystem\""
    exit 2
fi

}
#***********************end checksource****************************

#*********************gettarget******************************
gettarget () {
    while [ "$response" != "y" ]; do
        read -p "Enter the device to clone to [/dev/sdx]: " targetdevice
        targetdevice=${targetdevice:-/dev/sdx}
        read -p "Is $targetdevice correct [y/N]? " response
        response=${response:-N}
        response="${response:0:1}"
        response="${response,,}"
    done
}
#***********************end gettarget****************************

#************************checktarget*****************************
checktarget () {
    numtargetpartitions=$(lsblk -nlpo NAME,TYPE $targetdevice | awk '$2=="part"{print $1}' | wc -l)

    if [[ $targetdevice == *"nvme"* ]]; then
        efipartition="$targetdevice"p1
        mainpartition="$targetdevice"p2
    else
        efipartition="$targetdevice"1
        mainpartition="$targetdevice"2
    fi

    efishort=$(echo $efipartition | awk -F'/' '{print $3}')
    mainshort=$(echo $mainpartition | awk -F'/' '{print $3}')

    part1type=$(lsblk -o name,parttypename | grep $efishort | awk -F "$efishort" '{print $2}' | sed 's/^[[:space:]]*//')

    part2type=$(lsblk -o name,parttypename | grep $mainshort | awk -F "$mainshort" '{print $2}' | sed 's/^[[:space:]]*//')

    if [[ $part1type != "EFI System"  || $part2type != "Linux filesystem" ]]; then
        targetneedsformatted="true"
    else
        targetneedsformatted="false"
    fi
}
#**********************end checktarget***************************

#*****************askifformatdesired*************************
askifformatdesired () {

    if [[ $targetneedsformatted == "true" ]]; then
        echo -e "\n"
        read -p "Target device ($targetdevice) needs formatting, is that okay? [y/N]: " formatRequested
        formatRequested=${formatRequested:-N}
        formatRequested="${formatRequested:0:1}"
        formatRequested="${formatRequested,,}"
        if [[ $formatRequested != "y" ]]; then
            echo "Format needed but refused, aborting."
            exit;
        fi
    else #format not needed but still an option
        echo -e "\nTarget has preexisting clone."
        echo -e "Preexisting clone can either be refreshed or created anew. (default is to refresh the existing clone)"
        read -p "Format and create a new clone? [y/N]: " formatRequested
        formatRequested=${formatRequested:-N}
        formatRequested="${formatRequested:0:1}"
        formatRequested="${formatRequested,,}"
    fi
}
#**************end askifformatdesired************************

#*******************doformat************************
doformat () {
    possiblelabel="$(hostname)usb"
    echo
    read -p "Enter a new label for the target device (e.g. [$possiblelabel]): " label
    label=${label:-$possiblelabel}
    echo "Label of target device will be: $label"
    echo "This might take a few minutes, please be patient."
    fdisk $targetdevice <<EOF
g
n
1

+512M
t
C12A7328-F81F-11D2-BA4B-00A0C93EC93B
n
2


w
EOF

    echo "efi and ext4 partitions created successfully."
    echo "The new partitions will now be formatted"
    echo "This might take a few minutes, please be patient."
    mkfs.fat -F32 -n EFI "$efipartition"
    yes | mkfs.ext4 -L "$label" "$mainpartition"
    sync

}
#******************end doformat*********************

#*****************stopservices**********************
stopservices () {

systemctl stop cron
systemctl stop mysql

}
#***************end stopservices** *****************

#*******************doclone************************
doclone () {
echo "making the clone"
    label="target"
    mount /boot/efi
    mkdir -p /media/$user/EFI
    mount "$efipartition" /media/$user/EFI
    mkdir -p /media/$user/$label
    mount "$mainpartition" /media/$user/$label

    sourceuuid=$(findmnt / -o UUID -n)
    targetuuid=$(findmnt /media/$user/"$label" -o UUID -n)

    sourceefiuuid=$(grep /boot/efi /etc/fstab | awk '{print $1}' | grep UUID | sed -E 's/UUID=(.*)/\1/' )
    targetefiuuid=$(findmnt /media/$user/EFI/ -o UUID -n)

    rsync -rv --delete /boot/efi/ /media/$user/EFI/

#trying to make it more distro independent... not well tested
    find /media/$user/EFI/ -name "grub.cfg" -exec sed -i "s/$sourceuuid/$targetuuid/" "{}" \;
#old way proven to work on my Mint Mate installation but wouldn't work if grub.cfg is inside a differently named folder
#    sed -i "s/$sourceuuid/$targetuuid/" /media/$user/EFI/EFI/ubuntu/grub.cfg

    rsync -axAXHv --exclude='/dev/*' --exclude='/proc/*' --exclude='/sys/*' --exclude='/tmp/*' --exclude='/run/*' --exclude='/mnt/*' --exclude='/media/*' --exclude='/lost+found/' --delete  / /media/$user/"$label"/

    sed -i "s/$sourceuuid/$targetuuid/" /media/$user/$label/etc/fstab
    sed -i "s/$sourceuuid/$targetuuid/" /media/$user/$label/boot/grub/grub.cfg
    sed -i "s/$sourceefiuuid/$targetefiuuid/" /media/$user/$label/etc/fstab

    echo "Writing changes to target, do not remove!"

    sync
}
#*******************doclone************************

#***************restartservices********************
restartservices () {

    systemctl start cron
    systemctl start mysql

}
#**************end restartservices*****************

#*******************fixgrub************************
fixgrub () {

for i in /sys /run /dev /proc; do mount --bind "$i" "/media/$user/target$i"; done

chroot /media/$user/target/ /bin/bash -- << EOT
    update-grub
EOT

for i in /proc /dev /run /sys; do umount "/media/$user/target$i"; done

umount /media/$user/EFI
umount /media/$user/target

rmdir /media/$user/target
rmdir /media/$user/EFI

echo "It is now okay to remove the target drive."
}

#*****************end fixgrub**********************

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