146 lines
4.0 KiB
Bash
146 lines
4.0 KiB
Bash
#!/bin/bash
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set -eou pipefail
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readonly VERSION="v0.2.2"
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readonly GITREPO="https://github.com/framps/raspberryTools"
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readonly MYSELF="$(basename "$(test -L "$0" && readlink "$0" || echo "$0")")"
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readonly MYNAME=${MYSELF%.*}
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readonly DELETED_KERNELS_FILENAME="$MYNAME.krnl"
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function show_help() {
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echo "$MYSELF $VERSION ($GITREPO)"
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echo
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echo "Check for unnecessary kernels for the existing Raspberry hardware."
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echo "Optionally delete and save installed kernels for later reinstallation or reinstall the previously deleted kernels"
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echo
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echo "Usage: $MYSELF -i [-e] | -u [-e] | -h | -? | -v"
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echo "-e: deactivate dry run mode and modify system"
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echo "-i: reinstall kernels deleted with option -u"
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echo "-u: uninstall any unused kernels"
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echo "-h: display this help"
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echo "-v: display version"
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}
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function info() {
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echo "--- $@"
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}
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function error() {
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echo "??? $@"
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}
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function yesNo() {
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local answer=${1:0:1}
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answer=${1:-"n"}
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[[ "Yy" =~ $answer ]]
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return
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}
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function check4Pi() {
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dpkg --print-architecture | grep -q -E "arm(hf|64)"
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}
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function do_uninstall() {
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local availableKernels="$(dpkg --list | awk '/^ii[[:space:]]+linux-image/ { print $2 }')"
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local usedKernel="$(uname -a | awk '{ print "linux-image-" $3 }')"
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local unusedKernels="$(grep -v "$usedKernel" <<< "$availableKernels" | xargs -I {} echo "{}")"
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if [[ -z "$unusedKernels" ]]; then
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error "No unused kernels detected"
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exit 1
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fi
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local keptKernel="$(grep "$usedKernel" <<< "$availableKernels" | xargs -I {} echo "{}")"
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if [[ -z "$keptKernel" ]]; then
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error "No kernel will be kept"
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exit 1
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fi
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info "Following kernel will be kept"
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echo "$keptKernel"
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local numUnusedKernels="$(wc -l <<< "$unusedKernels")"
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info "Following $numUnusedKernels unused kernels will be deleted"
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echo "$unusedKernels"
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if (( $MODE_EXECUTE )); then
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local answer
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read -p "Are you sure to delete all $numUnusedKernels unused kernels ? (y/N) " answer
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if ! yesNo "$answer"; then
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exit 1
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fi
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read -p "Do you have a backup ? (y/N) " answer
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if ! yesNo "$answer"; then
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exit 1
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fi
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set +e
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if [[ -e /boot/$DELETED_KERNELS_FILENAME ]]; then
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sudo rm /boot/$DELETED_KERNELS_FILENAME
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(( $? )) && { error "Failure deleting /boot/$DELETED_KERNELS_FILENAME"; exit 42; }
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fi
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info "Saving $numUnusedKernels unused kernel names in /boot/$DELETED_KERNELS_FILENAME"
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echo "$unusedKernels" >> $DELETED_KERNELS_FILENAME; sudo mv $DELETED_KERNELS_FILENAME /boot
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(( $? )) && { error "Failure collecting kernels"; exit 42; }
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info "Removing $numUnusedKernels unused kernels"
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echo "$unusedKernels" | xargs sudo apt -y remove
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(( $? )) && { error "Failure removing kernels"; exit 42; }
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set -e
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fi
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}
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function do_install() {
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if [[ ! -e /boot/$DELETED_KERNELS_FILENAME ]]; then
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info "No unused kernels found"
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exit 0
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fi
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local numUnusedKernels=$(wc -l /boot/$DELETED_KERNELS_FILENAME | cut -f 1 -d ' ')
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if (( ! $MODE_EXECUTE )); then
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info "Following $numUnusedKernels unused kernels will be installed"
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while IFS= read -r line; do
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echo "$line"
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done < /boot/$DELETED_KERNELS_FILENAME
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else
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local errorOccured=0
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info "Installing $numUnusedKernels unused kernels"
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echo "$(</boot/$DELETED_KERNELS_FILENAME)"
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while IFS= read -r line; do
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sudo apt -y install $line
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set +e
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(( errorOccured |= $? ))
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set -e
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done < /boot/$DELETED_KERNELS_FILENAME
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if (( ! errorOccured )); then
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sudo rm /boot/$DELETED_KERNELS_FILENAME
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else
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error "Errors occured when installing kernels"
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fi
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fi
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}
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echo "$MYSELF $VERSION ($GITREPO)"
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if ! check4Pi; then
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error "No RaspberryPi detected"
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exit 1
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fi
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MODE_INSTALL=0
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MODE_UNINSTALL=0
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MODE_EXECUTE=0
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if (( $# == 0 )); then
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MODE_UNINSTALL=1
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else
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while getopts ":ehiuv?" opt; do
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case "$opt" in
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e) MODE_EXECUTE=1
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;;
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h|\?)
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show_help
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exit 0
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;;
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i) MODE_INSTALL=1
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;;
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u) MODE_UNINSTALL=1
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;;
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v) echo "$MYSELF $VERSION"
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exit 0
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;;
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*) echo "Unknown option $opt"
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show_help
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exit 1
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;;
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esac
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done
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fi
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if (( $MODE_INSTALL )); then
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do_install
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elif (( $MODE_UNINSTALL )); then
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do_uninstall
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else
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show_help
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fi |