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#!/bin/sh
#
# Usage: preseed.sh preseeded.iso source.iso [udebs]
#
# Credits: https://wiki.debian.org/DebianInstaller/Preseed/EditIso
# https://wiki.debian.org/DebianInstaller/Modify/CD
#
# Install with 'Advanced options > Automated install'
set -ue
newiso=$(readlink -f "$1")
[ -e "$newiso" ] && rm -f "$newiso"
iso="$2"
test -r "$iso" || exit 1
shift; shift
pwd=$(pwd)
for prog in fuseiso fusermount rsync md5sum xorriso find; do
if ! which "$prog" >/dev/null; then
echo "Error: Missing $prog" >&2
exit 1
fi
done
mountdir=$(mktemp -d)
fuseiso "$iso" "$mountdir"
isoeditdir=$(mktemp -d)
rsync -aH --exclude=TRANS.TBL --chmod=u+w "$mountdir"/ "$isoeditdir"/
fusermount -u "$mountdir"
rmdir "$mountdir"
cp preseed.cfg "$isoeditdir/"
md5sum ./preseed.cfg >> "$isoeditdir/md5sum.txt"
cfg="$isoeditdir/isolinux/*.cfg $isoeditdir/isolinux/*/*.cfg"
[ -d $isoeditdir/boot -a -d $isoeditdir/boot/grub ] && cfg="$cfg $isoeditdir/boot/grub/grub.cfg"
sed -ri "s@auto=true\s+priority=critical\b@& file=/cdrom/preseed.cfg @" $cfg
# ^ no need to update isolinux' checksum, as it's not in './md5sum.txt'.
mkdir "$isoeditdir/include"
rsync -aL ./include/ "$isoeditdir/include"/
find ./include \( \! -name '.*' -a -type f \) -print0 | \
xargs -r0 md5sum >> "$isoeditdir/md5sum.txt"
# XXX: that's ugly
dist=$(for x in "$isoeditdir"/dists/*; do [ -h "$x" ] && continue; [ -d "$x" ] && echo ${x##*/} && break; done)
arch=$(for x in "$isoeditdir/dists/$dist/main"/binary-*; do test -d "$x" && echo ${x##*/binary-} && break; done)
packages="dists/$dist/main/debian-installer/binary-$arch/Packages"
while [ $# -gt 0 ]; do
cd "${1%%_*}-udeb"; shift
name="$(sed -n 's/Package:\s\s*//p' ./debian/control)"
udeb=$(cut -d' ' -f1 ./debian/files)
dir="pool/main/$(expr substr "$name" 1 1)/$name"
mkdir -p "$isoeditdir/$dir/"
cp ../"$udeb" "$isoeditdir/$dir/"
cat "./debian/$name/DEBIAN/control" >> "$isoeditdir/$packages"
echo "Filename: $dir/$udeb" >> "$isoeditdir/$packages"
echo "MD5sum: $(md5sum ../"$udeb" | cut -d' ' -f1)" >> "$isoeditdir/$packages"
echo "SHA1: $(sha1sum ../"$udeb" | cut -d' ' -f1)" >> "$isoeditdir/$packages"
echo "SHA256: $(sha256sum ../"$udeb" | cut -d' ' -f1)" >> "$isoeditdir/$packages"
echo >> "$isoeditdir/$packages"
cd "$isoeditdir"
md5sum "./$dir/$udeb" >> "$isoeditdir/md5sum.txt"
cd "$pwd"
done
cd "$isoeditdir"
gzip -fk ./"$packages"
md5sums=$(mktemp)
while read sum file; do
if [ "$file" = "./${packages}" -o \
"$file" = "./${packages}.gz" -o \
"$file" = "./boot/grub/grub.cfg" ]; then
md5sum "$file"
else
echo "$sum $file"
fi
done < ./md5sum.txt > "$md5sums"
mv "$md5sums" "$isoeditdir/md5sum.txt"
if [ -f ./boot/grub/efi.img ]; then
efi_opts="--efi-boot boot/grub/efi.img -append_partition 2 0x01 ./boot/grub/efi.img"
else
efi_opts=
fi
xorriso -as mkisofs -r \
-checksum_algorithm_iso all \
-isohybrid-mbr /usr/lib/syslinux/isohdpfx.bin \
-b isolinux/isolinux.bin -c isolinux/boot.cat \
-partition_offset 16 \
-no-emul-boot -boot-load-size 4 -boot-info-table -eltorito-alt-boot $efi_opts \
-o "$newiso" \
./
rm -rf "$isoeditdir"
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