frontend/grub-mkrescue-sed.sh - platform/external/libburnia/libisoburn - Git at Google

 #!/bin/sh

 # Copyright (C) 2015 - 2022
 # Thomas Schmitt <scdbackup@gmx.net>, libburnia-project.org
 # Provided under BSD license: Use, modify, and distribute as you like.

 echo >&2
 echo "frontend/grub-mkrescue-sed.sh manipulating xorriso arguments" >&2
 echo >&2

 # This script may be handed by its absolute path to grub-mkrescue
 # via option --xorriso= . E.g.
 #
 #   mkdir minimal
 #   touch minimal/empty-file.txt
 #   grub-mkrescue -o output.iso minimal \
 #         --xorriso=/home/thomas/xorriso-1.4.3./frontend/grub-mkrescue-sed.sh
 #
 # It will manipulate the xorriso arguments before they get executed by a
 # xorriso program. Default is the neighboring ../../xorriso/xorriso program or,
 # if that neighbor cannot be found, the system-wide installed xorriso.
 #
 # The mode "mjg" implements a layout which resembles Fedora LiveCD and Debian
 # ISOs which are bootable by ISOLINUX for BIOS and GRUB2 for EFI.
 # Its GPT is considered to be surplus, according to UEFI specs.
 #
 # The mode "mbr_only" implements an alternative layout according to UEFI 2.4,
 # section 2.5.1 and table 16. No GTP, HFS+, or APM.
 # This mode produces a mountable ISO 9660 partition 1 only if variable
 # MKRESCUE_SED_PROTECTIVE is empty or set to "no".
 #
 # The mode "mbr_hfs" is like "mbr_only" but with HFS+ mentioned in APM.
 # It is still compliant to UEFI with no potentially deceiving GPT.
 # If you add xorrisofs option -part_like_isohybrid then no gap fillig APM
 # partition will emerge.
 #
 # Mode "gpt_appended" represents the same layout as "mbr_only" by GPT rather
 # than by MBR partition table. It differs from "original" by the fact that
 # option -partition_offset 16 is implied and that the first partition may
 # be used to mount the ISO 9660 filesystem. MKRESCUE_SED_PROTECTIVE is ignored,
 # because neat GPT is indicated by the existence of a Protective MBR.
 #
 # These modes avoid duplicate storing of the EFI system partition "efi.img"
 # by xorrisofs option  -e "--interval:appended_partition_${partno}:all::"
 # which is new to xorriso-1.4.4.
 # If "_copy" is appended to the mode name, then the file /efi.img will
 # appear in the ISO 9660 filesystem and traditional -e "/efi.img" is used.
 #
 # "mbr_only_copy" is supposed to work with unmodified xorriso >= 1.3.2

 #
 #                              Variation settings
 #
 # The environment variables MKRESCUE_SED_* override the following
 # default settings:

 # Manipulation mode:
 #  "mjg"         =  ESP in MBR+GPT+APM, with HFS+
 #  "mbr_only"    =  ESP in MBR, without HFS+
 #  "mbr_hfs"     =  ESP in MBR, HFS+ in APM
 #  "gpt_appended" = ESP in GPT, without HFS+
 #  $mode"_copy"  =  one of above modes, ESP in ISO and as appended partition
 #  "original"    =  pass arguments unchanged
 mode="mbr_only"
 if test -n "$MKRESCUE_SED_MODE"
 then
   mode="$MKRESCUE_SED_MODE"
 fi

 # First argument of -append_partition with mode "mjg". Values: 1 or 2.
 partno=1
 if test -n "$MKRESCUE_SED_PARTNO"
 then
   partno="$MKRESCUE_SED_PARTNO"
 fi

 # Replacement for option --protective-msdos-label. Either itself or empty text.
 # If the environment variable contains the word "no", this means empty.
 protective=""
 if test -n "$MKRESCUE_SED_PROTECTIVE"
 then
   if test x"$MKRESCUE_SED_PROTECTIVE" = xno
   then
     protective=""
   elif test x"$MKRESCUE_SED_PROTECTIVE" = xyes
   then
     protective="--protective-msdos-label"
   else
     protective="$MKRESCUE_SED_PROTECTIVE"
   fi
 fi

 # "yes" shows xorriso arguments, "extra" additionally shows all input files.
 debug=no
 if test -n "$MKRESCUE_SED_DEBUG"
 then
   debug="$MKRESCUE_SED_DEBUG"
 fi

 # The path to the program that will be executed with the converted arguments.
 if test -n "$MKRESCUE_SED_XORRISO"
 then
   xorriso="$MKRESCUE_SED_XORRISO"
 else
   # Prefer neighboring xorriso binary over system-wide installed one.
   self_dir="$(dirname $(dirname "$0") )"
   if test -x "$self_dir"/xorriso/xorriso
   then
     xorriso="$self_dir"/xorriso/xorriso
   else
     xorriso="xorriso"
   fi
 fi

 # MKRESCUE_SED_XORRISO_ARGS will be used as first arguments of the xorriso run.
 # (Trailing xorriso arguments may be simply added to the grub-mkrescue
 #  command line.)
 # Each argument must be a single word. No whitespace. No quotation marks.

 # "yes" in MKRESCUE_SED_IN_EFI_NO_PT overwrites the MBR partition table area
 # in the EFI boot image by zeros. Some EFI implementations get stuck when
 # seeing in the EFI partition a partition table entry which begins at LBA 0.
 # "extra" not only zeros the partition table but also the MBR signature.
 efi_zero_inner_pt=no
 if test -n "$MKRESCUE_SED_IN_EFI_NO_PT"
 then
   efi_zero_inner_pt="$MKRESCUE_SED_IN_EFI_NO_PT"
 fi

 # "yes" in MKRESCUE_SED_UNPACK_EFI_TO_ISO causes the file tree from the FAT
 # image efi.img to be unpacked by mcopy to a directory in /tmp which then
 # gets mapped into the root directory of the emerging ISO 9660 filesystem.
 # This enables a way of installing the result image onto a USB stick with
 # FAT filesystem by simply copying its full file tree from ISO to FAT.
 # Whether the payload files of the ISO will be able to work from FAT depends
 # on their expectation towards file names and attributes.
 # WARNING: Make sure that the files in efi.img do not collide with your
 #          payload files or with files added to the ISO by GRUB. Before using
 #          MKRESCUE_SED_UNPACK_EFI_TO_ISO, make a vanilla grub-mkrescue ISO
 #          with your payload, mount it and then its /efi.img file, then use
 #          program "find" on the mount point of efi.img to see all its files.
 #          Compare this with the output of "find" on the ISO mount point.
 efi_unpack_to_iso=no
 if test -n "$MKRESCUE_SED_UNPACK_EFI_TO_ISO"
 then
   efi_unpack_to_iso="$MKRESCUE_SED_UNPACK_EFI_TO_ISO"
 fi

 #
 #                               Do the work
 #

 # grub-mkrescue inquires features by running these arguments
 if test "$*" = "-as mkisofs -help"
 then
   "$xorriso" "$@"
   exit $?
 fi

 echo "frontend/grub-mkrescue-sed.sh mode:  $mode" >&2
 echo >&2

 if test x"$debug" = xyes -o x"$debug" = xextra
 then
   # Show arguments
   echo "##### Begin of received arguments" >&2
   echo "$0" >&2
   for i in "$@"
   do
     echo "$i" >&2
   done
   echo "##### End of received arguments" >&2
   echo >&2
 fi

 # Check for option -iso_mbr_part_type which is new in 1.4.8
 iso_mbr_part_type=
 if "$xorriso" -as mkisofs -help 2>&1 | grep iso_mbr_part_type >/dev/null
 then
   iso_mbr_part_type="-iso_mbr_part_type 0x00"
 fi

 # Look for the name of the /tmp directory with the GRUB2 files.
 # It is the next argument after -r. But as default accept any /tmp/grub.*
 next_is_dir=0
 dir="."
 for i in "$@"
 do
   if test x"$i" = x"-r"
   then
     next_is_dir=1
   elif test $next_is_dir = 1
   then
     next_is_dir=0
     if echo "$i" | grep '^/tmp/grub.' >/dev/null 2>&1
     then
       test -d "$i" && dir="$i"
     fi
   elif test "$dir" = "."
   then
     if echo "$i" | grep '^/tmp/grub.' >/dev/null 2>&1
     then
       test -d "$i" && dir="$i"
     fi
   fi
 done

 if test x"$debug" = xextra
 then
   # Show files on disk
   find "$dir" 2>&1
   echo 2>&1
 fi

 if test x"$efi_zero_inner_pt" = xyes -o x"$efi_zero_inner_pt" = xextra
 then
   did_dd=0
   if test -e "$dir"/efi.img
   then
     # Look for 0x55 0xAA in bytes 510 and 511
     magic=$(dd bs=1 skip=510 count=2 if="$dir"/efi.img 2>/dev/null | \
             od -c | head -1 | awk '{print $2 " " $3}')
     if test "$magic" = "U 252"
     then
       echo "Performing actions for MKRESCUE_SED_IN_EFI_NO_PT=$efi_zero_inner_pt" >&2
       dd if=/dev/zero bs=1 seek=446 count=64 conv=notrunc of="$dir"/efi.img
       did_dd=1
       if test "$efi_zero_inner_pt" = extra
       then
         dd if=/dev/zero bs=1 seek=510 count=2 conv=notrunc of="$dir"/efi.img
       fi
       echo >&2
     fi
   fi
   if test "$did_dd" = 0
   then
     echo >&2
     echo "$0 : NOTE : No EFI image found or no MBR signature in it." >&2
     echo "$0 : NOTE : Will not obey MKRESCUE_SED_IN_EFI_NO_PT=$efi_zero_inner_pt" >&2
     echo >&2
   fi
 fi

 efi_temp_tree=
 if test x"$efi_unpack_to_iso" = xyes
 then
   if test -e "$dir"/efi.img
   then
     temp_tree=/tmp/grub-mkrescue-sed-et."$$"
     # The mcopy command is the inverse of what grub-mkrescue does to pack it up
     if mcopy -s -i "$dir"/efi.img ::/ "$temp_tree"
     then
       efi_temp_tree="$temp_tree"
       if test x"$debug" = xyes -o x"$debug" = xextra
       then
         echo "Temporarily extracted $dir/efi.img to $temp_tree" >&2
         echo >&2
         if test x"$debug" = xextra
         then
           # Show extracted files
           find "$temp_tree" >&2
           echo >&2
         fi
       fi
     elif test -e "$temp_tree"
     then
       rm -r "$temp_tree"
     fi
     if test -z "$efi_temp_tree"
     then
       echo >&2
       echo "$0 : NOTE : Could not extract efi.img to $temp_tree" >&2
       echo "$0 : NOTE : Thus cannot obey MKRESCUE_SED_UNPACK_EFI_TO_ISO." >&2
       echo >&2
     fi
   fi
 fi

 efi_tmp_name=
 if test x"$mode" = xmjg \
      -o x"$mode" = xmbr_only \
      -o x"$mode" = xgpt_appended \
      -o x"$mode" = xmbr_hfs
 then
   # Move EFI partition image file out of the "$dir" tree, i.e. out of the ISO
   efi_tmp_name=grub-mkrescue-sed-ei.$$
   if test -e "$dir"/efi.img
   then
     mv "$dir"/efi.img /tmp/$efi_tmp_name
     if test x"$debug" = xyes -o x"$debug" = xextra
     then
       echo "Temporarily moved $dir/efi.img to /tmp/$efi_tmp_name" >&2
       echo >&2
     fi
   elif test -e /tmp/$efi_tmp_name
   then
     rm /tmp/$efi_tmp_name
   fi
 fi

 if test x"$mode" = xmjg
 then
   # Exchange arguments for the experimental GRUB2 mjg layout
   x=$(echo " $*" | sed \
     -e "s/-efi-boot-part --efi-boot-image/-no-pad -append_partition $partno 0xef \/tmp\/$efi_tmp_name/" \
     -e "s/--efi-boot efi\.img/-eltorito-alt-boot -e --interval:appended_partition_${partno}:all:: -no-emul-boot -isohybrid-gpt-basdat/" \
     -e "s/--protective-msdos-label/$protective -part_like_isohybrid/" \
      )

 elif test x"$mode" = xmjg_copy
 then
   # Exchange arguments for the experimental GRUB2 mjg layout
   x=$(echo " $*" | sed \
     -e "s/-efi-boot-part --efi-boot-image/-no-pad -append_partition $partno 0xef \/tmp\/$(basename "$dir")\/efi.img/" \
     -e "s/--efi-boot efi\.img/-eltorito-alt-boot -e efi.img -no-emul-boot -isohybrid-gpt-basdat/" \
     -e "s/--protective-msdos-label/$protective -part_like_isohybrid/" \
      )

 elif test x"$mode" = xmbr_only
 then
   # Exchange arguments for no-HFS MBR-only layout
   x=$(echo " $*" | sed \
     -e "s/-efi-boot-part --efi-boot-image/$iso_mbr_part_type -no-pad -append_partition 2 0xef \/tmp\/$efi_tmp_name/" \
     -e "s/--efi-boot efi\.img/-eltorito-alt-boot -e --interval:appended_partition_2:all:: -no-emul-boot/" \
     -e "s/-hfsplus .*CoreServices\/boot.efi//" \
     -e "s/--protective-msdos-label/$protective/" \
      )

 elif test x"$mode" = xmbr_only_copy
 then
   # Exchange arguments for no-HFS MBR-only layout
   x=$(echo " $*" | sed \
     -e "s/-efi-boot-part --efi-boot-image/$iso_mbr_part_type -no-pad -append_partition 2 0xef \/tmp\/$(basename "$dir")\/efi.img/" \
     -e "s/-hfsplus .*CoreServices\/boot.efi//" \
     -e "s/--protective-msdos-label/$protective/" \
      )

 elif test x"$mode" = xmbr_hfs
 then
   # Exchange arguments for MBR and HFS+ layout
   x=$(echo " $*" | sed \
     -e "s/-efi-boot-part --efi-boot-image/$iso_mbr_part_type -no-pad -append_partition 2 0xef \/tmp\/$efi_tmp_name/" \
     -e "s/--efi-boot efi\.img/-eltorito-alt-boot -e --interval:appended_partition_2:all:: -no-emul-boot/" \
     -e "s/--protective-msdos-label/$protective/" \
      )

 elif test x"$mode" = xmbr_hfs_copy
 then
   # Exchange arguments for MBR and HFS+ layout
   x=$(echo " $*" | sed \
     -e "s/-efi-boot-part --efi-boot-image/$iso_mbr_part_type -no-pad -append_partition 2 0xef \/tmp\/$(basename "$dir")\/efi.img/" \
     -e "s/--protective-msdos-label/$protective/" \
      )

 elif test x"$mode" = xgpt_appended
 then
   # Exchange arguments for no-HFS MBR-only layout
   x=$(echo " $*" | sed \
     -e "s/-efi-boot-part --efi-boot-image/-no-pad -append_partition 2 0xef \/tmp\/$efi_tmp_name -appended_part_as_gpt -partition_offset 16/" \
     -e "s/--efi-boot efi\.img/-eltorito-alt-boot -e --interval:appended_partition_2:all:: -no-emul-boot/" \
     -e "s/-hfsplus .*CoreServices\/boot.efi//" \
      )

 elif test x"$mode" = xgpt_appended_copy
 then
   # Exchange arguments for no-HFS MBR-only layout
   x=$(echo " $*" | sed \
     -e "s/-efi-boot-part --efi-boot-image/-no-pad -append_partition 2 0xef \/tmp\/$(basename "$dir")\/efi.img -appended_part_as_gpt -partition_offset 16/" \
     -e "s/-hfsplus .*CoreServices\/boot.efi//" \
      )

 elif test x"$mode" = xoriginal
 then
   # Pass arguments unchanged
   x=" $*"

 else
   echo >&2
   echo "$0 : FATAL : Unknown manipulation mode '$mode'." >&2
   echo >&2
   exit 1
 fi

 if echo "$efi_temp_tree" | grep '^/tmp/' >/dev/null
 then
   # Does the xorriso run end in native command mode ?
   separator_seen=0
   for i in "$@"
   do
     if test x"$i" = x--
     then
       separator_seen=1
     fi
   done
   if test "$separator_seen" = 1
   then
     # Native mode possible: Enable it for sure and then use -map
     x=" $x -- -map $efi_temp_tree /"
   else
     # Hopefully nobody finds a way to leave mkisofs emulation without "--" arg
     x=" $x -graft-points /=$efi_temp_tree"
   fi
 fi

 if test x"$debug" = xyes -o x"$debug" = xextra
 then
   echo "+ converted xorriso arguments:" >&2
   echo "  $x" >&2
   echo >&2
 fi

 # Run xorriso binary with the converted arguments
 use_gdb=no
 if test "$use_gdb" = yes
 then
   gdb_file=/tmp/grub-mkrescue-sed-gdb
   echo b assess_appended_gpt >$gdb_file
   echo run $MKRESCUE_SED_XORRISO_ARGS $x >>$gdb_file
   gdb -x $gdb_file "$xorriso"
   ret=0
 else
   "$xorriso" $MKRESCUE_SED_XORRISO_ARGS $x
   ret=$?
 fi

 # Move back the ESP if it was separated
 if test -n "$efi_tmp_name" -a -e /tmp/$efi_tmp_name
 then
    mv /tmp/$efi_tmp_name "$dir"/efi.img
 fi

 # Remove possible extracted EFI partition tree
 if echo "$efi_temp_tree" | grep '^/tmp/' >/dev/null
 then
   rm -r "$efi_temp_tree"
 fi

 exit $ret
	#!/bin/sh

	# Copyright (C) 2015 - 2022
	# Thomas Schmitt <scdbackup@gmx.net>, libburnia-project.org
	# Provided under BSD license: Use, modify, and distribute as you like.

	echo >&2
	echo "frontend/grub-mkrescue-sed.sh manipulating xorriso arguments" >&2
	echo >&2

	# This script may be handed by its absolute path to grub-mkrescue
	# via option --xorriso= . E.g.
	#
	# mkdir minimal
	# touch minimal/empty-file.txt
	# grub-mkrescue -o output.iso minimal \
	# --xorriso=/home/thomas/xorriso-1.4.3./frontend/grub-mkrescue-sed.sh
	#
	# It will manipulate the xorriso arguments before they get executed by a
	# xorriso program. Default is the neighboring ../../xorriso/xorriso program or,
	# if that neighbor cannot be found, the system-wide installed xorriso.
	#
	# The mode "mjg" implements a layout which resembles Fedora LiveCD and Debian
	# ISOs which are bootable by ISOLINUX for BIOS and GRUB2 for EFI.
	# Its GPT is considered to be surplus, according to UEFI specs.
	#
	# The mode "mbr_only" implements an alternative layout according to UEFI 2.4,
	# section 2.5.1 and table 16. No GTP, HFS+, or APM.
	# This mode produces a mountable ISO 9660 partition 1 only if variable
	# MKRESCUE_SED_PROTECTIVE is empty or set to "no".
	#
	# The mode "mbr_hfs" is like "mbr_only" but with HFS+ mentioned in APM.
	# It is still compliant to UEFI with no potentially deceiving GPT.
	# If you add xorrisofs option -part_like_isohybrid then no gap fillig APM
	# partition will emerge.
	#
	# Mode "gpt_appended" represents the same layout as "mbr_only" by GPT rather
	# than by MBR partition table. It differs from "original" by the fact that
	# option -partition_offset 16 is implied and that the first partition may
	# be used to mount the ISO 9660 filesystem. MKRESCUE_SED_PROTECTIVE is ignored,
	# because neat GPT is indicated by the existence of a Protective MBR.
	#
	# These modes avoid duplicate storing of the EFI system partition "efi.img"
	# by xorrisofs option -e "--interval:appended_partition_${partno}:all::"
	# which is new to xorriso-1.4.4.
	# If "_copy" is appended to the mode name, then the file /efi.img will
	# appear in the ISO 9660 filesystem and traditional -e "/efi.img" is used.
	#
	# "mbr_only_copy" is supposed to work with unmodified xorriso >= 1.3.2

	#
	# Variation settings
	#
	# The environment variables MKRESCUE_SED_* override the following
	# default settings:

	# Manipulation mode:
	# "mjg" = ESP in MBR+GPT+APM, with HFS+
	# "mbr_only" = ESP in MBR, without HFS+
	# "mbr_hfs" = ESP in MBR, HFS+ in APM
	# "gpt_appended" = ESP in GPT, without HFS+
	# $mode"_copy" = one of above modes, ESP in ISO and as appended partition
	# "original" = pass arguments unchanged
	mode="mbr_only"
	if test -n "$MKRESCUE_SED_MODE"
	then
	mode="$MKRESCUE_SED_MODE"
	fi

	# First argument of -append_partition with mode "mjg". Values: 1 or 2.
	partno=1
	if test -n "$MKRESCUE_SED_PARTNO"
	then
	partno="$MKRESCUE_SED_PARTNO"
	fi

	# Replacement for option --protective-msdos-label. Either itself or empty text.
	# If the environment variable contains the word "no", this means empty.
	protective=""
	if test -n "$MKRESCUE_SED_PROTECTIVE"
	then
	if test x"$MKRESCUE_SED_PROTECTIVE" = xno
	then
	protective=""
	elif test x"$MKRESCUE_SED_PROTECTIVE" = xyes
	then
	protective="--protective-msdos-label"
	else
	protective="$MKRESCUE_SED_PROTECTIVE"
	fi
	fi

	# "yes" shows xorriso arguments, "extra" additionally shows all input files.
	debug=no
	if test -n "$MKRESCUE_SED_DEBUG"
	then
	debug="$MKRESCUE_SED_DEBUG"
	fi

	# The path to the program that will be executed with the converted arguments.
	if test -n "$MKRESCUE_SED_XORRISO"
	then
	xorriso="$MKRESCUE_SED_XORRISO"
	else
	# Prefer neighboring xorriso binary over system-wide installed one.
	self_dir="$(dirname $(dirname "$0") )"
	if test -x "$self_dir"/xorriso/xorriso
	then
	xorriso="$self_dir"/xorriso/xorriso
	else
	xorriso="xorriso"
	fi
	fi

	# MKRESCUE_SED_XORRISO_ARGS will be used as first arguments of the xorriso run.
	# (Trailing xorriso arguments may be simply added to the grub-mkrescue
	# command line.)
	# Each argument must be a single word. No whitespace. No quotation marks.

	# "yes" in MKRESCUE_SED_IN_EFI_NO_PT overwrites the MBR partition table area
	# in the EFI boot image by zeros. Some EFI implementations get stuck when
	# seeing in the EFI partition a partition table entry which begins at LBA 0.
	# "extra" not only zeros the partition table but also the MBR signature.
	efi_zero_inner_pt=no
	if test -n "$MKRESCUE_SED_IN_EFI_NO_PT"
	then
	efi_zero_inner_pt="$MKRESCUE_SED_IN_EFI_NO_PT"
	fi

	# "yes" in MKRESCUE_SED_UNPACK_EFI_TO_ISO causes the file tree from the FAT
	# image efi.img to be unpacked by mcopy to a directory in /tmp which then
	# gets mapped into the root directory of the emerging ISO 9660 filesystem.
	# This enables a way of installing the result image onto a USB stick with
	# FAT filesystem by simply copying its full file tree from ISO to FAT.
	# Whether the payload files of the ISO will be able to work from FAT depends
	# on their expectation towards file names and attributes.
	# WARNING: Make sure that the files in efi.img do not collide with your
	# payload files or with files added to the ISO by GRUB. Before using
	# MKRESCUE_SED_UNPACK_EFI_TO_ISO, make a vanilla grub-mkrescue ISO
	# with your payload, mount it and then its /efi.img file, then use
	# program "find" on the mount point of efi.img to see all its files.
	# Compare this with the output of "find" on the ISO mount point.
	efi_unpack_to_iso=no
	if test -n "$MKRESCUE_SED_UNPACK_EFI_TO_ISO"
	then
	efi_unpack_to_iso="$MKRESCUE_SED_UNPACK_EFI_TO_ISO"
	fi

	#
	# Do the work
	#

	# grub-mkrescue inquires features by running these arguments
	if test "$*" = "-as mkisofs -help"
	then
	"$xorriso" "$@"
	exit $?
	fi

	echo "frontend/grub-mkrescue-sed.sh mode: $mode" >&2
	echo >&2

	if test x"$debug" = xyes -o x"$debug" = xextra
	then
	# Show arguments
	echo "##### Begin of received arguments" >&2
	echo "$0" >&2
	for i in "$@"
	do
	echo "$i" >&2
	done
	echo "##### End of received arguments" >&2
	echo >&2
	fi

	# Check for option -iso_mbr_part_type which is new in 1.4.8
	iso_mbr_part_type=
	if "$xorriso" -as mkisofs -help 2>&1 \| grep iso_mbr_part_type >/dev/null
	then
	iso_mbr_part_type="-iso_mbr_part_type 0x00"
	fi

	# Look for the name of the /tmp directory with the GRUB2 files.
	# It is the next argument after -r. But as default accept any /tmp/grub.*
	next_is_dir=0
	dir="."
	for i in "$@"
	do
	if test x"$i" = x"-r"
	then
	next_is_dir=1
	elif test $next_is_dir = 1
	then
	next_is_dir=0
	if echo "$i" \| grep '^/tmp/grub.' >/dev/null 2>&1
	then
	test -d "$i" && dir="$i"
	fi
	elif test "$dir" = "."
	then
	if echo "$i" \| grep '^/tmp/grub.' >/dev/null 2>&1
	then
	test -d "$i" && dir="$i"
	fi
	fi
	done

	if test x"$debug" = xextra
	then
	# Show files on disk
	find "$dir" 2>&1
	echo 2>&1
	fi

	if test x"$efi_zero_inner_pt" = xyes -o x"$efi_zero_inner_pt" = xextra
	then
	did_dd=0
	if test -e "$dir"/efi.img
	then
	# Look for 0x55 0xAA in bytes 510 and 511
	magic=$(dd bs=1 skip=510 count=2 if="$dir"/efi.img 2>/dev/null \| \
	od -c \| head -1 \| awk '{print $2 " " $3}')
	if test "$magic" = "U 252"
	then
	echo "Performing actions for MKRESCUE_SED_IN_EFI_NO_PT=$efi_zero_inner_pt" >&2
	dd if=/dev/zero bs=1 seek=446 count=64 conv=notrunc of="$dir"/efi.img
	did_dd=1
	if test "$efi_zero_inner_pt" = extra
	then
	dd if=/dev/zero bs=1 seek=510 count=2 conv=notrunc of="$dir"/efi.img
	fi
	echo >&2
	fi
	fi
	if test "$did_dd" = 0
	then
	echo >&2
	echo "$0 : NOTE : No EFI image found or no MBR signature in it." >&2
	echo "$0 : NOTE : Will not obey MKRESCUE_SED_IN_EFI_NO_PT=$efi_zero_inner_pt" >&2
	echo >&2
	fi
	fi

	efi_temp_tree=
	if test x"$efi_unpack_to_iso" = xyes
	then
	if test -e "$dir"/efi.img
	then
	temp_tree=/tmp/grub-mkrescue-sed-et."$$"
	# The mcopy command is the inverse of what grub-mkrescue does to pack it up
	if mcopy -s -i "$dir"/efi.img ::/ "$temp_tree"
	then
	efi_temp_tree="$temp_tree"
	if test x"$debug" = xyes -o x"$debug" = xextra
	then
	echo "Temporarily extracted $dir/efi.img to $temp_tree" >&2
	echo >&2
	if test x"$debug" = xextra
	then
	# Show extracted files
	find "$temp_tree" >&2
	echo >&2
	fi
	fi
	elif test -e "$temp_tree"
	then
	rm -r "$temp_tree"
	fi
	if test -z "$efi_temp_tree"
	then
	echo >&2
	echo "$0 : NOTE : Could not extract efi.img to $temp_tree" >&2
	echo "$0 : NOTE : Thus cannot obey MKRESCUE_SED_UNPACK_EFI_TO_ISO." >&2
	echo >&2
	fi
	fi
	fi

	efi_tmp_name=
	if test x"$mode" = xmjg \
	-o x"$mode" = xmbr_only \
	-o x"$mode" = xgpt_appended \
	-o x"$mode" = xmbr_hfs
	then
	# Move EFI partition image file out of the "$dir" tree, i.e. out of the ISO
	efi_tmp_name=grub-mkrescue-sed-ei.$$
	if test -e "$dir"/efi.img
	then
	mv "$dir"/efi.img /tmp/$efi_tmp_name
	if test x"$debug" = xyes -o x"$debug" = xextra
	then
	echo "Temporarily moved $dir/efi.img to /tmp/$efi_tmp_name" >&2
	echo >&2
	fi
	elif test -e /tmp/$efi_tmp_name
	then
	rm /tmp/$efi_tmp_name
	fi
	fi

	if test x"$mode" = xmjg
	then
	# Exchange arguments for the experimental GRUB2 mjg layout
	x=$(echo " $*" \| sed \
	-e "s/-efi-boot-part --efi-boot-image/-no-pad -append_partition $partno 0xef \/tmp\/$efi_tmp_name/" \
	-e "s/--efi-boot efi\.img/-eltorito-alt-boot -e --interval:appended_partition_${partno}:all:: -no-emul-boot -isohybrid-gpt-basdat/" \
	-e "s/--protective-msdos-label/$protective -part_like_isohybrid/" \
	)

	elif test x"$mode" = xmjg_copy
	then
	# Exchange arguments for the experimental GRUB2 mjg layout
	x=$(echo " $*" \| sed \
	-e "s/-efi-boot-part --efi-boot-image/-no-pad -append_partition $partno 0xef \/tmp\/$(basename "$dir")\/efi.img/" \
	-e "s/--efi-boot efi\.img/-eltorito-alt-boot -e efi.img -no-emul-boot -isohybrid-gpt-basdat/" \
	-e "s/--protective-msdos-label/$protective -part_like_isohybrid/" \
	)

	elif test x"$mode" = xmbr_only
	then
	# Exchange arguments for no-HFS MBR-only layout
	x=$(echo " $*" \| sed \
	-e "s/-efi-boot-part --efi-boot-image/$iso_mbr_part_type -no-pad -append_partition 2 0xef \/tmp\/$efi_tmp_name/" \
	-e "s/--efi-boot efi\.img/-eltorito-alt-boot -e --interval:appended_partition_2:all:: -no-emul-boot/" \
	-e "s/-hfsplus .*CoreServices\/boot.efi//" \
	-e "s/--protective-msdos-label/$protective/" \
	)

	elif test x"$mode" = xmbr_only_copy
	then
	# Exchange arguments for no-HFS MBR-only layout
	x=$(echo " $*" \| sed \
	-e "s/-efi-boot-part --efi-boot-image/$iso_mbr_part_type -no-pad -append_partition 2 0xef \/tmp\/$(basename "$dir")\/efi.img/" \
	-e "s/-hfsplus .*CoreServices\/boot.efi//" \
	-e "s/--protective-msdos-label/$protective/" \
	)

	elif test x"$mode" = xmbr_hfs
	then
	# Exchange arguments for MBR and HFS+ layout
	x=$(echo " $*" \| sed \
	-e "s/-efi-boot-part --efi-boot-image/$iso_mbr_part_type -no-pad -append_partition 2 0xef \/tmp\/$efi_tmp_name/" \
	-e "s/--efi-boot efi\.img/-eltorito-alt-boot -e --interval:appended_partition_2:all:: -no-emul-boot/" \
	-e "s/--protective-msdos-label/$protective/" \
	)

	elif test x"$mode" = xmbr_hfs_copy
	then
	# Exchange arguments for MBR and HFS+ layout
	x=$(echo " $*" \| sed \
	-e "s/-efi-boot-part --efi-boot-image/$iso_mbr_part_type -no-pad -append_partition 2 0xef \/tmp\/$(basename "$dir")\/efi.img/" \
	-e "s/--protective-msdos-label/$protective/" \
	)

	elif test x"$mode" = xgpt_appended
	then
	# Exchange arguments for no-HFS MBR-only layout
	x=$(echo " $*" \| sed \
	-e "s/-efi-boot-part --efi-boot-image/-no-pad -append_partition 2 0xef \/tmp\/$efi_tmp_name -appended_part_as_gpt -partition_offset 16/" \
	-e "s/--efi-boot efi\.img/-eltorito-alt-boot -e --interval:appended_partition_2:all:: -no-emul-boot/" \
	-e "s/-hfsplus .*CoreServices\/boot.efi//" \
	)

	elif test x"$mode" = xgpt_appended_copy
	then
	# Exchange arguments for no-HFS MBR-only layout
	x=$(echo " $*" \| sed \
	-e "s/-efi-boot-part --efi-boot-image/-no-pad -append_partition 2 0xef \/tmp\/$(basename "$dir")\/efi.img -appended_part_as_gpt -partition_offset 16/" \
	-e "s/-hfsplus .*CoreServices\/boot.efi//" \
	)

	elif test x"$mode" = xoriginal
	then
	# Pass arguments unchanged
	x=" $*"

	else
	echo >&2
	echo "$0 : FATAL : Unknown manipulation mode '$mode'." >&2
	echo >&2
	exit 1
	fi

	if echo "$efi_temp_tree" \| grep '^/tmp/' >/dev/null
	then
	# Does the xorriso run end in native command mode ?
	separator_seen=0
	for i in "$@"
	do
	if test x"$i" = x--
	then
	separator_seen=1
	fi
	done
	if test "$separator_seen" = 1
	then
	# Native mode possible: Enable it for sure and then use -map
	x=" $x -- -map $efi_temp_tree /"
	else
	# Hopefully nobody finds a way to leave mkisofs emulation without "--" arg
	x=" $x -graft-points /=$efi_temp_tree"
	fi
	fi

	if test x"$debug" = xyes -o x"$debug" = xextra
	then
	echo "+ converted xorriso arguments:" >&2
	echo " $x" >&2
	echo >&2
	fi

	# Run xorriso binary with the converted arguments
	use_gdb=no
	if test "$use_gdb" = yes
	then
	gdb_file=/tmp/grub-mkrescue-sed-gdb
	echo b assess_appended_gpt >$gdb_file
	echo run $MKRESCUE_SED_XORRISO_ARGS $x >>$gdb_file
	gdb -x $gdb_file "$xorriso"
	ret=0
	else
	"$xorriso" $MKRESCUE_SED_XORRISO_ARGS $x
	ret=$?
	fi

	# Move back the ESP if it was separated
	if test -n "$efi_tmp_name" -a -e /tmp/$efi_tmp_name
	then
	mv /tmp/$efi_tmp_name "$dir"/efi.img
	fi

	# Remove possible extracted EFI partition tree
	if echo "$efi_temp_tree" \| grep '^/tmp/' >/dev/null
	then
	rm -r "$efi_temp_tree"
	fi

	exit $ret