Repository: k3s-io/k3s
File: install.sh (Shell)

Code before:
        case "$path" in $1*) echo "$path" ;; esac
    done < /proc/self/mounts | sort -r | xargs -r -t -n 1 sh -c 'umount -f "$0" && rm -rf "$0"'
    set -x
}

clean_mounted_directory() {
    for path in "$1"/*; do
        if [ -d "$path" ]; then
            if grep -q "$path" /proc/mounts; then
                clean_mounted_directory "$path"
            else
                rm -rf "$path"
            fi
        else
            rm "$path"
        fi
     done
}

do_unmount_and_remove '/run/k3s'
do_unmount_and_remove '/var/lib/rancher/k3s/data'
do_unmount_and_remove '/var/lib/rancher/k3s/storage'
do_unmount_and_remove '/var/lib/kubelet/pods'
do_unmount_and_remove '/var/lib/kubelet/plugins'
do_unmount_and_remove '/run/netns/cni-'
clean_mounted_directory '/var/lib/rancher/k3s'

# Remove CNI namespaces
ip netns show 2>/dev/null | grep cni- | xargs -r -t -n 1 ip netns delete

remove_interfaces

rm -rf /var/lib/cni/
iptables-save | grep -v KUBE- | grep -v CNI- | grep -iv flannel | iptables-restore
ip6tables-save | grep -v KUBE- | grep -v CNI- | grep -iv flannel | ip6tables-restore
EOF
    $SUDO chmod 755 ${KILLALL_K3S_SH}
    $SUDO chown root:root ${KILLALL_K3S_SH}
}

# --- create uninstall script ---
create_uninstall() {
    [ "${INSTALL_K3S_BIN_DIR_READ_ONLY}" = true ] && return
    info "Creating uninstall script ${UNINSTALL_K3S_SH}"
    $SUDO tee ${UNINSTALL_K3S_SH} >/dev/null << EOF
#!/bin/sh
set -x
[ \$(id -u) -eq 0 ] || exec sudo \$0 \$@

${KILLALL_K3S_SH}


Review comment (suggestion):
wait wait wait, we put this in the killall script... so now whenever you run the killall script it deletes all of K3s off your node. This makes sense to do in the uninstaller but the killall script DEFINITELY shouldn't be deleting everything out from under /var/lib/rancher/k3s otherwise you end up wiping your cluster off the face of the earth when all you wanted to do was kill the pods and service.

Code after:
        tailscale set --advertise-routes=
    fi
}

getshims() {
    ps -e -o pid= -o args= | sed -e 's/^ *//; s/\s\s*/\t/;' | grep -w 'k3s/data/[^/]*/bin/containerd-shim' | cut -f1
}

killtree $({ set +x; } 2>/dev/null; getshims; set -x)

do_unmount_and_remove() {
    set +x
    while read -r _ path _; do
        case "$path" in $1*) echo "$path" ;; esac
    done < /proc/self/mounts | sort -r | xargs -r -t -n 1 sh -c 'umount -f "$0" && rm -rf "$0"'
    set -x
}

do_unmount_and_remove '/run/k3s'
do_unmount_and_remove '/var/lib/kubelet/pods'
do_unmount_and_remove '/var/lib/kubelet/plugins'
do_unmount_and_remove '/run/netns/cni-'

# Remove CNI namespaces
ip netns show 2>/dev/null | grep cni- | xargs -r -t -n 1 ip netns delete

remove_interfaces

rm -rf /var/lib/cni/
iptables-save | grep -v KUBE- | grep -v CNI- | grep -iv flannel | iptables-restore
ip6tables-save | grep -v KUBE- | grep -v CNI- | grep -iv flannel | ip6tables-restore
EOF
    $SUDO chmod 755 ${KILLALL_K3S_SH}
    $SUDO chown root:root ${KILLALL_K3S_SH}
}

# --- create uninstall script ---
create_uninstall() {
    [ "${INSTALL_K3S_BIN_DIR_READ_ONLY}" = true ] && return
    info "Creating uninstall script ${UNINSTALL_K3S_SH}"
    $SUDO tee ${UNINSTALL_K3S_SH} >/dev/null << EOF
#!/bin/sh
set -x
[ \$(id -u) -eq 0 ] || exec sudo \$0 \$@

K3S_DATA_DIR=\${K3S_DATA_DIR:-/var/lib/rancher/k3s}

${KILLALL_K3S_SH}

if command -v systemctl; then
    systemctl disable ${SYSTEM_NAME}