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--- dual_boot_ubuntu_batocera.linux [2023/12/28 00:11] – lbrpdx
+++ dual_boot_ubuntu_batocera.linux [2024/09/21 20:15] (current) – [Ventoy] maximumentropy
@@ Line 208: / Line 208: @@
 Technically, this isn't really dual-booting, but booting a static image already loaded onto your drive's filesystem as its own mounted filesystem. It can ease the process of updating the image, however this is probably unnecessary as Batocera itself has [[:updates_and_downloads|its own updating tool]]. Nonetheless it could be useful for machines that otherwise don't have an internet connection and have to rely on another one to update or machines that absolutely refuse to boot via conventional manners.
-By default, Batocera's userdata partition is only 512MB before expanding, obviously not large enough to do anything. Ventoy's boot process prevents Batocera from seeing the drive as having any available free space, so auto-expansion on the first boot never occurs. This can be solved by either //only// mounting Batocera's boot partition (thus making the next immediate partition the userdata partition, whatever that may be) or by running the following (replace ''#'' with the number of GB you want in **total**, including the boot partition):
+By default, Batocera's userdata partition is only 512MB before expanding, obviously not large enough to do anything. Ventoy uses the booted image file as a virtual hard disk, so with a factory-provided image, the userdata partition can't be auto-expanded beyond the baseline 512MB at first boot. This can be solved by either //only// mounting Batocera's boot partition (thus making the next immediate partition the userdata partition, whatever that may be) or by running the following (replace ''#'' with the number of GB you want in **total**, including the boot partition):
 <code>
@@ Line 224: / Line 224: @@
 gparted /dev/loop *
 </code>
+If you prefer using a script instead of manual procedures, this will add a specified amount of space to a Batocera image file,
+and will expand the /userdata SHARE partition to fill the added space:
+<code bash| batocera-ventoy-resize.sh>
+#!/bin/bash
+# batocera-ventoy-resize.sh 20240921 n2qz/maximumentropy
+# Expand a Batocera installation image file to make storage space
+# available in SHARE when booting the image from Ventoy.
+#
+# Tested on Ubuntu 24.04.1 LTS with e2fsprogs 1.47.0. May not work on
+# older versions of linux, as current Batocera images (v41+) use newer
+# ext4 features not available with older ext4 utilities
+err () {
+    exitcode=$?
+    echo "... Exit code $exitcode on line ${BASH_LINENO[0]} while executing command: $BASH_COMMAND"
+    exit $exitcode
+}
+trap err ERR
+growsize="$1"
+inputimage="$2"
+outputimage="$3"
+if [ -z "${growsize}" -o -z "${inputimage}" -o "${inputimage}" = "${outputimage}" -o "${outputimage}" != "$(basename "${outputimage}" .gz)" ]
+then
+    echo "Usage: $0 growsize inputimage[.gz] [outputimage]"
+    echo "Example: $0 32G batocera.img ventoy.img"
+    exit 2
+fi
+image=$(basename "${inputimage}" .gz)
+if [ -z "${outputimage}" ]
+then
+    outputimage="ventoy-${image}"
+fi
+if [ "${inputimage}" = "${image}" ]
+then
+    echo "... Copy ${inputimage} to ${outputimage}"
+    cp "${inputimage}" "{$outputimage}"
+else
+    echo "... Decompress ${inputimage} to ${outputimage}"
+    gzip -vkcd "${inputimage}" > "${outputimage}"
+fi
+echo "... Grow image ${outputimage}"
+truncate -s "+${growsize}" "$outputimage"
+echo "... Set up loopback device"
+lodev=$(sudo losetup --find --show --partscan "${outputimage}")
+echo "... Loopback device is: ${lodev}"
+sharepart=2
+sharepartdev="${lodev}p${sharepart}"
+echo "... Adjust GPT on ${lodev}"
+sudo sgdisk -e "${lodev}"
+echo "... Show free space on ${sharepartdev}"
+sudo dumpe2fs "${sharepartdev}" | grep '^Free blocks'
+echo "... Resize SHARE partition ${sharepartdev}"
+sudo parted -s "${lodev}" "resizepart ${sharepart} 100%"
+echo "... Check ${sharepartdev}"
+sudo fsck -f "${sharepartdev}"
+echo "... Grow ${sharepartdev}"
+sudo resize2fs "${sharepartdev}"
+echo "... Show free space on ${sharepartdev}"
+sudo dumpe2fs "${sharepartdev}" | grep '^Free blocks'
+echo "... Detach loopback device ${lodev}"
+sudo losetup -d "${lodev}"
+echo "... Successfully completed"
+</code>