From 0703bcd7e672693fd10b468e4153c596b98ef23d Mon Sep 17 00:00:00 2001
From: Thomas Schmitt <scdbackup@gmx.net>
Date: Mon, 28 Dec 2015 11:26:05 +0000
Subject: [PATCH] Added modes "mbr_only", "original" and parameter variables
 MKRESCUE_SED_*

---
 frontend/grub-mkrescue-sed.sh | 129 +++++++++++++++++++++++++++++-----
 1 file changed, 112 insertions(+), 17 deletions(-)

diff --git a/frontend/grub-mkrescue-sed.sh b/frontend/grub-mkrescue-sed.sh
index 37b8cb22..5a9e715b 100755
--- a/frontend/grub-mkrescue-sed.sh
+++ b/frontend/grub-mkrescue-sed.sh
@@ -16,33 +16,105 @@ echo >&2
 #   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 the neighboring ../../xorriso/xorriso program.
+# 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.
 #
-# In its current form it implements an experiment which should be
-# accompanied by a xorriso from
+# The mode "mjg" implements an experiment which should be accompanied by a
+# GNU xorriso built by
 #   export CPPFLAGS="-DLibisofs_mjg_boot_for_grub2" 
 #   ./configure && make clean && make
+#
+# The mode "mbr_only" implements an alternative fully UEFI compliant layout
+# which does not produce GTP, HFS+, and APM.
+# It is supposed to work with any unmodified xorriso >= 1.3.2
+#
 
-# Variation settings:
+#
+#                              Variation settings
+#
+# The environment variables MKRESCUE_SED_* override the following
+# default settings:
 
-# First argument of -append_partition
+# Manipulation mode:
+#  "mjg"       =  ESP in MBR+GPT+APM, with HFS+
+#  "mbr_only"  =  ESP in MBR, without HFS+
+#  "original"  =  pass arguments unchanged
+mode="mjg"
+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
+# Replacement for option --protective-msdos-label. Either itself or empty text.
+# If the environment variable contains the word "no", this means empty.
 protective="--protective-msdos-label"
+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" make the script very verbous
+# "yes" shows xorriso arguments, "extra" additionally shows all input files.
 debug=no
+if test -n "$MKRESCUE_SED_DEBUG"
+then
+  debug="$MKRESCUE_SED_DEBUG"
+fi
 
-if test "$debug" = yes
+# The path to the program that will be executed with the converted arguments.
+if test -n "$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.
+
+
+#
+#                               Do the work 
+#
+
+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 "|""$i""|" >&2
+    echo "$i" >&2
   done
+  echo "##### End of recived arguments" >&2
+  echo >&2
 fi
 
 # Look for the name of the /tmp directory with the GRUB2 files.
@@ -61,26 +133,49 @@ do
   fi
 done
 
-if test "$debug" = yes
+if test x"$debug" = xextra
 then
   # Show files on disk
   find "$dir"
 fi
 
-# Exchange arguments for the experimental GRUB2 mjg layout
-x=$(echo " $*" | sed \
+if test x"$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 $partno 0xef \/tmp\/$(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/" \
      )
 
-if test "$debug" = yes
+elif test x"$mode" = xmbr_only
+then
+  # Exchange arguments for no-HFS MBR-only layout
+  x=$(echo " $*" | sed \
+    -e "s/-efi-boot-part --efi-boot-image/-no-pad -append_partition 2 0xef \/tmp\/$(basename "$dir")\/efi.img/" \
+    -e "s/-hfsplus .*CoreServices\/boot.efi//" \
+    -e "s/--protective-msdos-label/$protective/" \
+     )
+
+elif test x"$mode" = xoriginal
+then
+  # Pass arguments unchanged
+  x=" $*"
+
+else
+  echo >&2
+  echo "$0 : FATAL : Unknown manipulation mode '$mode'." >&2
+  echo >&2
+  exit 1
+fi
+
+if test x"$debug" = xyes -o x"$debug" = xextra
 then
   echo "+ converted xorriso arguments:" >&2
   echo "  $x" >&2
+  echo >&2
 fi
 
-# Run neighboring xorriso binary with the altered arguments
-self_dir=$(dirname $(dirname "$0") )
-"$self_dir"/xorriso/xorriso $x
+# Run xorriso binary with the converted arguments
+"$xorriso" $MKRESCUE_SED_XORRISO_ARGS $x