Having two operating systems (Linux and Windows 10) I get annoying problem - WIndows 10 keep settings itself first boot option instead of what I wanted. After selecting Linux manually at UEFI boot menu I want it to set itself first again. Following script and systemd service file allows to check boot order in UEFI and set Linux as first boot
Script named "BootFirst" and located in "/etc/systemd/system/scripts":
#!/bin/bash
#Name=${1:-shell}
Name="${1}"
Result=0
if [[ -z "$Name" ]] # if empty
then
Name="Linux"
fi
readarray -t BootInfo < <(efibootmgr)
BootOrder=$(printf -- '%s\n' "${BootInfo[@]}" | grep -P "^BootOrder: " | perl -pe 's/^BootOrder:\s+(.*)$/\1/')
IFS=',' read -ra BootOrder <<< "$BootOrder"
FirstBootNumber=${BootOrder[0]}
SelectedBootNumber="$(printf -- '%s\n' "${BootInfo[@]}" | grep -im1 $Name | perl -p -e 's/^Boot(\d{4}).*$/\1/g')"
if [[ -n "$SelectedBootNumber" ]] && [[ -n "$FirstBootNumber" ]] # if found
then
if [[ ! $SelectedBootNumber = $FirstBootNumber ]]; then
First=$(printf -- '%s\n' "${BootOrder[@]}" | grep -nm1 "$FirstBootNumber" | cut -f1 -d":")
((First--))
Selected=$(printf -- '%s\n' "${BootOrder[@]}" | grep -nm1 "$SelectedBootNumber" | cut -f1 -d":")
((Selected--))
Tmp="${BootOrder[First]}"
BootOrder[First]="${BootOrder[Selected]}"
BootOrder[Selected]="$Tmp"
efibootmgr -o "$(printf -- '%s,' "${BootOrder[@]}"| perl -pe 's/^(.*),$/\1/')"
Result=$?
if (( Result == 0 ))
then
echo "Have set new boot order"
fi
else
echo "Boot order is correct"
fi
else
echo "Error: found no entries that match '$Name'"
exit 1
fi
if (( Result != 0 ))
then
echo "Failed: exiting with nothing"
fi
Systemd service file named "boot-order.service":
[Unit]
Description=Set Linux as the first boot option
#After=
[Service]
Type=oneshot
ExecStart=/etc/systemd/system/scripts/BootFirst
[Install]
WantedBy=multi-user.target
After making this files run:
systemctl daemon-reload
systemctl enable boot-order.service
