From 41611e5cf6e186b0f07e1ffb87b00ae85626773b Mon Sep 17 00:00:00 2001
From: Thomas Schmitt <scdbackup@gmx.net>
Date: Sun, 27 Dec 2015 20:20:38 +0000
Subject: [PATCH] Man-in-the-middle script to manipulate the xorriso run of
 grub-mkrescue

---
 Makefile.am                        |  1 +
 frontend/grub-mkrescue-sed.sh      | 86 ++++++++++++++++++++++++++++++
 xorriso/make_xorriso_standalone.sh | 23 +++++---
 xorriso/xorriso_makefile_am.txt    |  1 +
 4 files changed, 103 insertions(+), 8 deletions(-)
 create mode 100755 frontend/grub-mkrescue-sed.sh

diff --git a/Makefile.am b/Makefile.am
index 7d1b997c..b78120c8 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -263,6 +263,7 @@ EXTRA_DIST = \
 	frontend/xorriso-tcltk \
 	frontend/sh_on_named_pipes.sh \
 	frontend/xorriso_broker.sh \
+	frontend/grub-mkrescue-sed.sh \
 	README \
 	AUTHORS \
 	CONTRIBUTORS \
diff --git a/frontend/grub-mkrescue-sed.sh b/frontend/grub-mkrescue-sed.sh
new file mode 100755
index 00000000..37b8cb22
--- /dev/null
+++ b/frontend/grub-mkrescue-sed.sh
@@ -0,0 +1,86 @@
+#!/bin/sh
+
+# Copyright (C) 2015
+# 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 the neighboring ../../xorriso/xorriso program.
+#
+# In its current form it implements an experiment which should be
+# accompanied by a xorriso from
+#   export CPPFLAGS="-DLibisofs_mjg_boot_for_grub2" 
+#   ./configure && make clean && make
+
+# Variation settings:
+
+# First argument of -append_partition
+partno=1
+
+# Replacement for option --protective-msdos-label
+protective="--protective-msdos-label"
+
+# "yes" make the script very verbous
+debug=no
+
+if test "$debug" = yes
+then
+  # Show arguments
+  echo "$0" >&2
+  for i in "$@"
+  do
+    echo "|""$i""|" >&2
+  done
+fi
+
+# Look for the name of the /tmp directory with the GRUB2 files.
+# It is the next argument after -r.
+next_is_dir=0
+dir="."
+for i in "$@"
+do
+  if test x"$i" = x"-r"
+  then
+    next_is_dir=1
+  elif test $next_is_dir = 1
+  then
+    next_is_dir=0
+    dir="$i"
+  fi
+done
+
+if test "$debug" = yes
+then
+  # Show files on disk
+  find "$dir"
+fi
+
+# 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
+then
+  echo "+ converted xorriso arguments:" >&2
+  echo "  $x" >&2
+fi
+
+# Run neighboring xorriso binary with the altered arguments
+self_dir=$(dirname $(dirname "$0") )
+"$self_dir"/xorriso/xorriso $x
+
diff --git a/xorriso/make_xorriso_standalone.sh b/xorriso/make_xorriso_standalone.sh
index 56b30fb6..201fb4ec 100755
--- a/xorriso/make_xorriso_standalone.sh
+++ b/xorriso/make_xorriso_standalone.sh
@@ -12,19 +12,25 @@
 #   libisofs           jte         libburn         libisoburn
 # obtained according to instructions on http://libburnia-project.org.
 #
-# Produce a necessary binary
-#   (cd libisoburn-develop/xorriso && \
-#    cc -g -Wall -o unite_html_b_line unite_html_b_line.c )
-#
 # It creates a new directory tree
 #   xorriso-standalone
 # for building GNU xorriso.
+# The ./bootstrap script gets applied and a source tarball is made.
 #
-# The ./bootstrap script gets applied and a source tarball
-# is made.
+# Before running this script one needs to apply autotools to libisoburn
+#   ./libisoburn-develop/bootstrap
 #
-# From that tree can be build a binary xorriso/xorriso which at runtime
-# does not depend on installed libburnia libraries.
+# and to produce a necessary binary
+#   (cd libisoburn-develop/xorriso && \
+#    cc -g -Wall -o unite_html_b_line unite_html_b_line.c )
+#
+# Then run
+#
+#   ./libisoburn-develop/xorriso/make_xorriso_standalone.sh
+#
+# From the emerging xorriso-standalone tree can be build a binary
+#   xorriso/xorriso
+# which at runtime does not depend on installed libburnia libraries.
 # Execute in xorriso-standalone :
 #
 #   ./configure && make
@@ -246,6 +252,7 @@ copy_files \
  frontend/xorriso-tcltk \
  frontend/sh_on_named_pipes.sh \
  frontend/xorriso_broker.sh \
+ frontend/grub-mkrescue-sed.sh \
  "$lone_dir"/frontend
 
 
diff --git a/xorriso/xorriso_makefile_am.txt b/xorriso/xorriso_makefile_am.txt
index ff7ffe05..ebf4bfbb 100644
--- a/xorriso/xorriso_makefile_am.txt
+++ b/xorriso/xorriso_makefile_am.txt
@@ -343,6 +343,7 @@ EXTRA_DIST = \
 	frontend/xorriso-tcltk \
 	frontend/sh_on_named_pipes.sh \
 	frontend/xorriso_broker.sh \
+	frontend/grub-mkrescue-sed.sh \
 	libisofs/aaip-os-dummy.c \
 	libisofs/aaip-os-linux.c \
 	libisofs/aaip-os-freebsd.c \