diff options
| -rw-r--r-- | README.md | 39 | ||||
| -rw-r--r-- | efi-sync | 131 |
2 files changed, 170 insertions, 0 deletions
diff --git a/README.md b/README.md new file mode 100644 index 0000000..dd1f1ad --- /dev/null +++ b/README.md @@ -0,0 +1,39 @@ +# EFI Sync + +Automatically install your kernel and initrd into the EFI when your Slackware system is updated. + +``` +Usage: ./efi-sync {install|watch} + + - install: install the kernel and initrd into your EFI. + - watch: install on updates to your kernel + +``` + +`efi-sync` watches your kernel path for updates. Once one is detected and the +package commands have completed, your EFI will be updated. `mkinitrd` to +update your initial ram disk if its configuration file is present. + +## Installation + +Run the following are root to install this command: +``` +cp efi-sync /usr/local/sbin/efi-sync +chown root:root /usr/local/sbin/efi-sync +chmod +x /usr/local/sbin/efi-sync +``` + +## Configuration + +The command looks for configuration at /etc/efi-sync.conf. + +Here is an example with the default values: +``` +# The kernel path to watch. +KERNEL=/boot/vmlinuz +# The path to the EFI kernel. +EFI_KERNEL=/boot/efi/Slackware/vmlinuz +``` + +If you want the initial ram disk updated, ensure /etc/mkinitrd.conf exists and +'OUTPUT_IMAGE' is set to the initrd.gz path on your EFI. diff --git a/efi-sync b/efi-sync new file mode 100644 index 0000000..1129a16 --- /dev/null +++ b/efi-sync @@ -0,0 +1,131 @@ +#!/bin/bash + +trap graceful_exit QUIT TERM + +# Inofity events which signal something changed. +MODIFICATION_EVENTS="CREATE,CLOSE_WRITE,MOVED_TO,MOVED_FROM,MOVE" + +# Signals if the watcher should stop. +STOP=false + +graceful_exit () { + STOP=true + + if [[ ! -z "$KPID" ]]; then + kill -TERM $KPID + fi + if [[ ! -z "$MPID" ]]; then + kill -TERM $MPID + fi +} + +load_config() { + KERNEL=/boot/vmlinuz + EFI_KERNEL=/boot/efi/EFI/Slackware/vmlinuz + + if [[ -f /etc/efi-sync.conf ]]; then + source /etc/efi-sync.conf || exit 1 + fi + + INSTALL_PROGRAMS="slackpkg,upgradepkg,installpkg,removepkg" + WAIT_TIME=5 +} + +log () { + echo "$(date --rfc-3339=seconds) $@" +} + +require_efi () { + if ! mount | grep vfat >/dev/null; then + log "the efi partition must be mounted" + exit 1 + fi +} + +require_root () { + if [[ $USER != "root" ]]; then + log "command must be run as root" + exit 1 + fi +} + +efi_install () { + require_root + require_efi + load_config + + KERNEL_VERSION="$(basename $(realpath "$KERNEL") | sed -E 's/vmlinuz-(.*)-(.*)/\2/')" + + log "Installing $(realpath "$KERNEL")." + cp -H "$KERNEL" "${EFI_KERNEL}"|| log "Failed to copy '${KERNEL}' into your EFI at '${EFI_KERNEL}'." + + if [[ -f /etc/mkinitrd.conf ]]; then + log "Installing the initial RAM disk for kernel version '${KERNEL_VERSION}'." + mkinitrd -F -c -k "${KERNEL_VERSION}" >/dev/null 2>&1 || log "mkinitrd failed to build and install your initial ramdisk." + fi +} + +efi_watch () { + require_root + require_efi + load_config + + while ! $STOP; do + log "Watching ${KERNEL} for updates." + + inotifywait "$(dirname "$KERNEL")" --include "./$(basename $KERNEL)$" \ + --event "$MODIFICATION_EVENTS" \ + --quiet \ + >/dev/null & + KPID="$!" + + # Watching for directory updates is enough and helps avoid the system's watch limit. + find /lib/firmware /lib/modules -type d \ + | xargs inotifywait \ + --event "$MODIFICATION_EVENTS" \ + --quiet \ + --recursive \ + >/dev/null & + MPID="$!" + + if ! wait -n "$KPID" "$MPID"; then + kill -QUIT $KPID $MPID >/dev/null 2>&1 + continue + fi + kill -QUIT $KPID $MPID >/dev/null 2>&1 + unset KPID + unset MPID + + if [[ -f /etc/mkinitrd.conf ]]; then + local count=0 + + while [[ $count -lt ${WAIT_TIME} ]]; do + while ps -C "${INSTALL_PROGRAMS}" >/dev/null; do + let "count = 0" + sleep 1 + done + + let "count = $count + 1" + done + fi + + efi_install + done + + log "Stopped watching ${KERNEL} for updates." +} + +case "$1" in + 'install') + efi_install + ;; + 'watch') + efi_watch + ;; + *) + echo "Usage: $0 [install|watch]" + echo "" + echo -e "\t- install: install the kernel and initrd into your EFI." + echo -e "\t- watch: install on updates to your kernel" + echo "" +esac |