Latest version

make-squash-image

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+#!/bin/bash
+# Lackadaisical squashfs tools
+# Allows you to create a modifiable squashfs-backed image for a folder
+BIN_DIR=$(dirname "$(readlink -f "$0")")
+DIR=$1
+
+test -d "$DIR"
+if [[ $? -ne 0 ]]; then
+  echo Directory "$DIR" does not exist!
+	exit -1
+fi
+
+DIRSIZE=$(du -s "$DIR")
+
+DIR=$(readlink -f "$DIR")
+DIR_SHORT=$(basename "$DIR")
+echo Compressing "$DIR"
+
+# Make basic dirs
+mkdir -p "${DIR}"
+mkdir -p "${DIR_SHORT}"
+
+OVERLAY_ROOT=$(readlink -f "${DIR}/..")/.squashfs/${DIR_SHORT}
+OVERLAY_UPPER=${OVERLAY_ROOT}/upper
+OVERLAY_LOWER=${OVERLAY_ROOT}/lower
+OVERLAY_WORK=${OVERLAY_ROOT}/work
+OVERLAY_TARG=$DIR
+RECREATE=false
+
+echo "Overlay information"
+echo "========================================================================="
+echo "> DIR = \"$DIR\""
+echo "> DIR_SHORT = \"$DIR_SHORT\""
+echo "> OVERLAY_ROOT = \"$OVERLAY_ROOT\""
+echo "> OVERLAY_UPPER = \"$OVERLAY_LOWER\""
+echo "> OVERLAY_LOWER= \"$OVERLAY_UPPER\""
+echo "> OVERLAY_WORK = \"$OVERLAY_WORK\""
+echo "> OVERLAY_TARG = \"$OVERLAY_TARG\""
+echo "========================================================================="
+
+# Make the dirs for the overlay
+mkdir -p "$OVERLAY_ROOT"
+mkdir -p "$OVERLAY_UPPER"
+mkdir -p "$OVERLAY_LOWER"
+mkdir -p "$OVERLAY_WORK"
+mkdir -p "$OVERLAY_TARG"
+
+# Check for existing image
+if test -f "${OVERLAY_ROOT}.img"; then
+  echo "We already have an existing image, updating i..."
+  RECREATE=true
+fi
+
+sudo mksquashfs "$DIR" "${OVERLAY_ROOT}.img.1" -noappend -comp xz
+
+if [ $RECREATE == true ]; then
+	echo "Copy created, now unmount and swap everything."
+	sudo rm -rf "$OVERLAY_UPPER"
+	sudo rm -rf "$OVERLAY_LOWER"
+	sudo rm -rf "$OVERLAY_WORK"
+	rm -rf "${OVERLAY_ROOT}.img"
+fi
+
+mv "${OVERLAY_ROOT}.img.1" "${OVERLAY_ROOT}.img"
+
+# Reset dir
+sudo rm -rf "$DIR"
+mkdir -p "$DIR"
+touch "${DIR}/.needs_mount"
+
+echo "Your SquashFS-backed folder is ready for use."
+echo "To mount it, either cd into it or use mount-squash-image."
+echo "We recomnnend setting up a cronjob for that."
+echo ""
+echo "Should you wish to update the contents of the image with your changes made"
+echo "imside of the folder, simply run make-squash-image again on the same"
+echo "folder to update the imaghe."
+echo
+echo "To disable auto-mounting upon cd, pleas remove the"
+echo "'.needs_mount' file to prevent that."
+echo "To enable mount at-login, add something aking to this to cron:"
+echo "\"@reboot <path>/mount-squash-image <folder>\""
+echo
+echo "========================================================================="
+echo "Storage data:"
+echo "Uuncompressed: $DIRSIZE"
+echo "   Compressed: $(du -s ${OVERLAY_ROOT}.img)"
+echo "========================================================================="