xen uninstall reinstall

Here is what I do using any source package to reinstall.

Please be very careful, run a few lines at a time, and verify backups are correct... it's not a highly safe script.

I only tested it on my own machine, where it runs without any issues.

Using snapper (openSUSE) and btrfs:

    # backup:
    date=$(date +%s)
    mkdir /backup
    tar czf /backup/boot-xen-${date}.tgz /boot/*xen*
    snapper create
    snap=$(ls -1 /.snapshots/ | sort -n | tail -n1)

    make uninstall

    # some files not uninstalled by the above
    tar czf /backup/other-${date}.tgz /usr/lib64/libxen* /lib64/libxen* /usr/lib64/efi/xen* /lib64/xen /usr/lib/xen

    rm /usr/lib64/libxen* /lib64/libxen* /usr/lib64/efi/xen*
    rm -rf /lib64/xen /usr/lib/xen

    # restore backup:
    ( cd /; tar xzf /backup/boot-xen-${date}.tgz )
    cp --reflink=always -rn /.snapshots/${snap}/snapshot/lib/modules/*xen* /lib/modules/
    cp --reflink=always -rn /.snapshots/${snap}/snapshot/etc/xen /etc/
    mkdir /var/lib/xen/
    cp --reflink=always -rn /.snapshots/${snap}/snapshot/var/lib/xen/* /var/lib/xen/

    make install && echo success || echo failure

Without snapper or btrfs (UNTESTED):
    date=$(date +%s)
    mkdir /backup
    tar czf /backup/boot-xen-${date}.tgz /boot/*xen*
    tar czf /backup/modules-xen-${date}.tgz /lib/modules/*xen*
    tar czf /backup/etc-xen-${date}.tgz /etc/xen
    #NOTE: without using snapper, this step might take VERY long, depending on whether you have big disk files here; maybe replace with "mv" instead of tar
    tar czf /backup/var-lib-xen-${date}.tgz /var/lib/xen

    make uninstall
    tar czf /backup/other-${date}.tgz /usr/lib64/libxen* /lib64/libxen* /usr/lib64/efi/xen* /lib64/xen /usr/lib/xen
    rm /usr/lib64/libxen* /lib64/libxen* /usr/lib64/efi/xen*
    rm -rf /lib64/xen /usr/lib/xen

    cd /
    tar xzf /backup/boot-xen-${date}.tgz
    tar xzf /backup/modules-xen-${date}.tgz
    tar xzf /backup/etc-xen-${date}.tgz
    #NOTE: maybe slow; see note above
    tar xzf /backup/var-lib-xen-${date}.tgz

    make install && echo success || echo failure