slackware-current/source/installer/sources/initrd/usr/lib/setup/SeTEFI

#!/bin/sh
TMP=/var/log/setup/tmp
T_PX="`cat $TMP/SeTT_PX`"
if [ ! -d $TMP ]; then
  mkdir -p $TMP
fi

# If the kernel does not support EFI, then we shouldn't be trying to mount an
# EFI partition. If we do, probably the only device found with an EFI structure
# will be the installer, which we don't want added to /etc/fstab.
if [ ! -d /sys/firmware/efi ]; then
  exit
fi

rm -f $TMP/SeTefipartitions
touch $TMP/SeTefipartitions

# Scan for EFI partitions:
# The UEFI specification states that an EFI System partition should have 
# a GUID of C12A7328-F81F-11D2-BA4B-00A0C93EC93B for a GPT disk layout.
# In case of a MBR disk layout instead, an ESP should have an OS type of
# 0xEF. lsblk writes these values in the same field: PARTTYPE.
ESPGUID=C12A7328-F81F-11D2-BA4B-00A0C93EC93B
OSTYPE=0xEF
lsblk -l -o parttype,name | \
grep -i -F -e "$ESPGUID" -e "$OSTYPE" | \
sed "s,[^ ]*[ ]*,/dev/," > $TMP/SeTefipartitions

if [ ! -s $TMP/SeTefipartitions ]; then # No EFI partitions
  rm -f $TMP/SeTefipartitions
  exit
fi

# Initially, we will just take the first EFI partition found, which
# will probably be on /dev/sda:
PREFERRED_EFI_PARTITION="$(cat $TMP/SeTefipartitions | head -n 1)"

# But we will also test to see if there is an EFI partition on the same
# device as the root partition, and if so, prefer that:
if [ -r $TMP/SeTrootdev ]; then
  if grep -q "$(cat $TMP/SeTrootdev | cut -b 1-8)" $TMP/SeTefipartitions ; then
    PREFERRED_EFI_PARTITION="$(grep "$(cat $TMP/SeTrootdev | cut -b 1-8)" $TMP/SeTefipartitions | head -n 1)"
  fi
fi

# This file is no longer needed:
rm -f $TMP/SeTefipartitions

# See if EFI partition is formatted.  If not, offer to format it:
EFITMPMOUNT=$(mktemp -d)
if ! mount $PREFERRED_EFI_PARTITION $EFITMPMOUNT 1> /dev/null 2> /dev/null ; then
  # It didn't mount, so it must not be formatted:
  dialog --title "FORMAT EFI PARTITION ${PREFERRED_EFI_PARTITION}?" \
  --yesno "An EFI System Partition was found on ${PREFERRED_EFI_PARTITION}, \
but it has not yet been formatted. Would you like to format this partition?" \
7 56
  if [ ! $? = 0 ]; then
    exit
  fi
  # Format the partition with FAT32, 2 sectors per cluster (needed for the
  # minimum supported EFI partition size of 100MB):
  dialog --title "FORMATTING EFI PARTITION ${PREFERRED_EFI_PARTITION}" --infobox \
  "Formatting EFI System Partition ${PREFERRED_EFI_PARTITION} as FAT32." 3 60
  mkfs.vfat -F 32 -s 2 ${PREFERRED_EFI_PARTITION} 1> /dev/null 2> /dev/null
  sleep 1
  mount ${PREFERRED_EFI_PARTITION} $EFITMPMOUNT 1> /dev/null 2> /dev/null
fi
if [ ! -d $EFITMPMOUNT/EFI -a ! -d $EFITMPMOUNT/efi ]; then
  mkdir $EFITMPMOUNT/EFI 1> /dev/null 2> /dev/null
fi
umount $PREFERRED_EFI_PARTITION 1> /dev/null 2> /dev/null
rmdir $EFITMPMOUNT

# Mount the partition on ${T_PX}/boot/efi:
if [ ! -d ${T_PX}/boot/efi ]; then
  mkdir -p ${T_PX}/boot/efi
fi
mount ${PREFERRED_EFI_PARTITION} ${T_PX}/boot/efi 1> /dev/null 2> /dev/null

# Add the EFI System Partition to /etc/fstab:
printf "%-16s %-16s %-11s %-16s %-3s %s\n" "$PREFERRED_EFI_PARTITION" "/boot/efi" "vfat" "defaults" "1" "0" > $TMP/SeTEFI
cat << EOF > $TMP/tempmsg

Adding this information to your /etc/fstab:

EOF
cat $TMP/SeTEFI >> $TMP/tempmsg
dialog --backtitle "Finished setting up EFI System Partition." \
--title "EFI SYSTEM PARTITION RECOGNIZED" \
--exit-label OK \
--textbox $TMP/tempmsg 10 72

# Piggyback this fstab addition on the other native partitions in SeTnative:
cat $TMP/SeTEFI >> $TMP/SeTnative
rm -f $TMP/SeTEFI $TMP/tempmsg

# Done.