# In conf/default.conf we defined an empty variable USING_UEFI_BOOTLOADER # This script will try to guess if we're using UEFI or not, and if yes, # then add all the required executables, kernel modules, etc... # Most likely, only recent OSes will be UEFI capable, such as SLES11, RHEL6, Ubuntu 12.10, Fedora 18, Arch Linux # If noefi is set, we can ignore UEFI altogether if grep -qw 'noefi' /proc/cmdline; then return fi # By default the variable USING_UEFI_BOOTLOADER is empty which means ReaR will decide (this script) # except when the variable USING_UEFI_BOOTLOADER has an explicit 'false' value set: if is_false $USING_UEFI_BOOTLOADER ; then # we forced the variable to zero (in local.conf) so we do not want UEFI stuff Log "We do not want UEFI capabilities in ReaR (USING_UEFI_BOOTLOADER=0)" return fi # FIXME: I <jsmeix@suse.de> wonder if ReaR should also decide via the code below # if the variable USING_UEFI_BOOTLOADER has already an explicit 'true' value set. # I think if the variable USING_UEFI_BOOTLOADER has an explicit 'true' value set # but the code below returns before "it is safe to turn on USING_UEFI_BOOTLOADER=1" # then something is probably wrong because the user wants USING_UEFI_BOOTLOADER # but the tests in the code below seem to contradict what the user wants # so that probably ReaR should better abort here with an error and not # blindly proceed and then fail later in arbitrary unpredictable ways # cf. https://github.com/rear/rear/issues/801#issuecomment-200353337 # or is it also usually "safe to proceed with USING_UEFI_BOOTLOADER=1" # when the user has explicitly specified that regardless of the tests below? # Some distributions don't have a builtin efivars kernel module, so we need to load it. # Be aware, efivars is not listed with 'lsmod' modprobe -q efivars # Next step is checking the presence of UEFI variables directory. # However, we should first check kernel command line to see whether we hide on purpose the UEFI vars with 'noefi': SYSFS_DIR_EFI_VARS= if [[ -d /sys/firmware/efi/vars ]] ; then SYSFS_DIR_EFI_VARS=/sys/firmware/efi/vars elif [[ -d /sys/firmware/efi/efivars ]] ; then SYSFS_DIR_EFI_VARS=/sys/firmware/efi/efivars else return 0 # when UEFI is enabled the dir is there fi # mount-point: efivarfs on /sys/firmware/efi/efivars type efivarfs (rw,nosuid,nodev,noexec,relatime) if grep -qw efivars /proc/mounts ; then SYSFS_DIR_EFI_VARS=/sys/firmware/efi/efivars fi # Next step is case-sensitive checking /boot for case-insensitive /efi directory (we need it): test "$( find /boot -maxdepth 1 -iname efi -type d )" || return 0 # Next step is to get the EFI (Extensible Firmware Interface) system partition (ESP): local esp_proc_mounts_line=() # The output of # grep -E ' /boot/efi | /boot ' /proc/mounts # may look like the following examples # on a openSUSE Leap 15.0 system # /dev/sda1 /boot/efi vfat rw,relatime,fmask=0022,dmask=0022,codepage=437,iocharset=iso8859-1,shortname=mixed,errors=remount-ro 0 0 # cf. https://github.com/rear/rear/issues/2095#issuecomment-475548960 # or like this on a Debian buster system # /dev/sda1 /boot/efi vfat rw,relatime,fmask=0077,dmask=0077,codepage=437,iocharset=ascii,shortname=mixed,utf8,errors=remount-ro 0 0 # cf. https://github.com/rear/rear/issues/2095#issuecomment-475684942 # and https://github.com/rear/rear/issues/2095#issuecomment-481739166 # The ESP could be mounted on /boot/efi or on /boot. # First try /boot/efi: esp_proc_mounts_line=( $( grep ' /boot/efi ' /proc/mounts || echo false ) ) if is_false $esp_proc_mounts_line ; then # If nothing is mounted on /boot/efi try /boot: esp_proc_mounts_line=( $( grep ' /boot ' /proc/mounts || echo false ) ) if is_false $esp_proc_mounts_line ; then DebugPrint "No EFI system partition found (nothing mounted on /boot/efi or /boot)" return fi fi # The ESP filesystem type must be vfat (under Linux): if ! test "vfat" = "${esp_proc_mounts_line[2]}" ; then DebugPrint "No 'vfat' EFI system partition found (${esp_proc_mounts_line[0]} on ${esp_proc_mounts_line[1]} is type ${esp_proc_mounts_line[2]})" return 0 fi # When we are still here we have a filesystem type 'vfat' mounted on /boot/efi or on /boot. # In this case we assume what is mounted there actually is a EFI system partition (ESP) # so we assume it is safe to turn on USING_UEFI_BOOTLOADER=1 DebugPrint "Found EFI system partition ${esp_proc_mounts_line[0]} on ${esp_proc_mounts_line[1]} type ${esp_proc_mounts_line[2]}" USING_UEFI_BOOTLOADER=1 LogPrint "Using UEFI Boot Loader for Linux (USING_UEFI_BOOTLOADER=1)"