fix

make-preseed-iso.sh

@@ -0,0 +1,90 @@
+#!/bin/bash
+
+set -e
+
+function extract_iso() {
+  echo "Extracting iso: $1..."
+  mkdir isofiles
+  7z x $1 -oisofiles
+}
+
+function add_preseed_to_initrd() {
+  echo "Adding preseed.cfg to initrd..."
+  chmod +w isofiles/install.amd/ -R
+  gunzip isofiles/install.amd/initrd.gz
+  echo preseed.cfg | cpio -H newc -o -A -F isofiles/install.amd/initrd
+  gzip isofiles/install.amd/initrd
+  chmod -w isofiles/install.amd/ -R
+}
+
+function make_auto_the_default_isolinux_boot_option() {
+  tmp_isolinux_cfg=$(mktemp --tmpdir isolinux.XXXXX)
+
+  echo "Setting 'auto' as default ISOLINUX boot entry..."
+  sed 's/timeout 0/timeout 3/g' isofiles/isolinux/isolinux.cfg >$tmp_isolinux_cfg
+  echo "default auto" >>$tmp_isolinux_cfg
+  chmod +w isofiles/isolinux/isolinux.cfg
+  cat $tmp_isolinux_cfg >isofiles/isolinux/isolinux.cfg
+  chmod -w isofiles/isolinux/isolinux.cfg
+  rm $tmp_isolinux_cfg
+}
+
+function make_auto_the_default_grub_boot_option() {
+  echo "Setting 'auto' as default GRUB boot entry..."
+  chmod +w isofiles/boot/grub/grub.cfg
+  # The index for the grub menus is zero-based for the
+  # Root menu, but 1-based for the rest, so 2>5 is the
+  # second menu (advanced options) => fifth option (auto)
+  echo 'set default="2>5"' >>isofiles/boot/grub/grub.cfg
+  echo "set timeout=3" >>isofiles/boot/grub/grub.cfg
+  chmod -w isofiles/boot/grub/grub.cfg
+}
+
+function recompute_md5_checksum() {
+  echo "Calculating new md5 checksum..."
+  echo " -- You can safely ignore the warning about a 'file system loop' below"
+  cd isofiles
+  chmod +w md5sum.txt
+  find . -follow -type f ! -name md5sum.txt -print0 | xargs -0 md5sum >md5sum.txt
+  chmod -w md5sum.txt
+  cd ..
+}
+
+function generate_new_iso_and_cleanup() {
+  local orig_iso="$1"
+  local new_iso="$2"
+
+  echo "Generating new iso: $new_iso..."
+  dd if="$orig_iso" bs=1 count=432 of=mbr_template.bin
+
+  chmod +w isofiles/isolinux/isolinux.bin
+  xorriso -as mkisofs -r \
+    -V 'Debian AUTO amd64' \
+    -o "$new_iso" \
+    -J -joliet-long \
+    -cache-inodes \
+    -isohybrid-mbr mbr_template.bin \
+    -b isolinux/isolinux.bin \
+    -c isolinux/boot.cat \
+    -boot-load-size 4 -boot-info-table \
+    -no-emul-boot -eltorito-alt-boot \
+    -e boot/grub/efi.img -no-emul-boot \
+    -isohybrid-gpt-basdat \
+    -isohybrid-apm-hfsplus \
+    isofiles
+
+  chmod +w isofiles -R
+  rm -rf isofiles mbr_template.bin
+}
+
+orig_iso="$1"
+new_iso="./preseed-$(basename $orig_iso)"
+
+extract_iso "$orig_iso"
+add_preseed_to_initrd
+make_auto_the_default_isolinux_boot_option
+make_auto_the_default_grub_boot_option
+recompute_md5_checksum
+generate_new_iso_and_cleanup "$orig_iso" "$new_iso"
+
+echo "DONE."