Extend boot timeouts

modify_timeout.sh

@@ -0,0 +1,44 @@
+#!/usr/bin/env bash
+set -exo pipefail
+
+distro="${1}"
+
+# Find URL
+url="$(cat "${distro}" | grep url | cut -f2 -d'"')"
+curl -C - -O "${url}"
+
+# Mount and copy
+file=$(printf "${url}" | sed -E -e 's#.*/(.*)$#\1#')
+old=$(mktemp -d)
+new=$(mktemp -d)
+sudo mount -t iso9660 -o loop "${file}" "${old}"
+{
+	cd "${old}"
+	tar -cvf - . | (cd "${new}" && tar -xf -)
+	cd -
+}
+
+# Modify timeout
+chmod +w "${new}/boot/grub" "${new}/boot/grub/grub.cfg"
+chmod +w "${new}/isolinux" "${new}/isolinux/isolinux.cfg"
+sed -i -e 's/set timeout=.*/set timeout=30/' "${new}/boot/grub/grub.cfg"
+sed -i -e 's/timeout.*/timeout 300/' "${new}/isolinux/isolinux.cfg"  # Uses 10ths of a second
+chmod -w "${new}/boot/grub" "${new}/boot/grub/grub.cfg"
+chmod -w "${new}/isolinux" "${new}/isolinux/isolinux.cfg"
+cat "${new}/boot/grub/grub.cfg"
+
+# Create new ISO file
+sudo umount "${old}"
+rm "${file}"
+chmod +w "${new}/isolinux/isolinux.bin"
+mkisofs -b isolinux/isolinux.bin -c isolinux/boot.cat -no-emul-boot -boot-load-size 4 -boot-info-table -J -R -V "Boot" -r -iso-level 4 -chrp-boot -o "${file}" "${new}"
+new_sum=$(sha256sum "${file}" | cut -f1 -d' ')
+
+# Update distro file
+sed -i "${distro}" -e "s/checksum = \".*\"/checksum = \"${new_sum}\"/"
+sed -i "${distro}" -e "s/url = \".*\"/url = \"${file}\"/"
+sed -i "${distro}" -e "s/boot_wait = \".*\"/boot_wait = \"15s\"/"
+
+# Cleanup remaining directories
+rm -r "${old}"
+#sudo rm -r "${new}"