118 lines
3.3 KiB
Bash
Executable file
118 lines
3.3 KiB
Bash
Executable file
#!/bin/bash
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# Lackadaisical squashfs tools
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# Allows you to create a modifiable squashfs-backed image for a folder
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BIN_DIR=$(dirname "$(readlink -f "$0")")
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DIR="$1"
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if [[ -z "$DIR" ]]; then
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echo "Usage: $0 <directory>"
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exit 1
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fi
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if [[ ! -d "$DIR" ]]; then
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echo "Error: Directory \"$DIR\" does not exist!"
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exit 1
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fi
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echo "Checking system requirements (FUSE, SquashFS, OverlayFS)..."
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for fs in fuse squashfs overlay; do
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if ! grep -q "$fs" /proc/filesystems; then
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echo "Attempting to load $fs module..."
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sudo modprobe "$fs" || { echo "Error: $fs is not supported."; exit 1; }
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fi
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done
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DIR=$(readlink -f "$DIR")
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DIR_SHORT=$(basename "$DIR")
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DIRSIZE=$(du -sh "$DIR" | cut -f1)
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OVERLAY_ROOT="$(dirname "$DIR")/.squashfs/$DIR_SHORT"
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OVERLAY_UPPER="$OVERLAY_ROOT/upper"
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OVERLAY_LOWER="$OVERLAY_ROOT/lower"
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OVERLAY_WORK="$OVERLAY_ROOT/work"
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OVERLAY_TARG="$DIR"
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RECREATE=false
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mkdir -p "$OVERLAY_ROOT"
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if [[ -f "${OVERLAY_ROOT}.img" ]]; then
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echo "Existing image found, updating..."
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"$BIN_DIR/mount-squash-image" "$DIR"
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DIRSIZE=$(du -sh "$DIR" | cut -f1)
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RECREATE=true
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fi
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echo "Compressing \"$DIR\"..."
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sudo mksquashfs "$DIR" "${OVERLAY_ROOT}.img.1" -noappend -comp xz || exit 1
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if [[ "$RECREATE" == "true" ]]; then
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echo "Cleaning up old layers..."
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"$BIN_DIR/umount-squash-image" "$DIR"
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# Safety check before destructive RM
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if [[ -n "$OVERLAY_ROOT" && "$OVERLAY_ROOT" != "/" ]]; then
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sudo rm -rf "$OVERLAY_UPPER" "$OVERLAY_LOWER" "$OVERLAY_WORK"
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rm -f "${OVERLAY_ROOT}.img"
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fi
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fi
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mv "${OVERLAY_ROOT}.img.1" "${OVERLAY_ROOT}.img"
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# Prepare overlay structure
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mkdir -p "$OVERLAY_UPPER" "$OVERLAY_LOWER" "$OVERLAY_WORK" "$OVERLAY_TARG"
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# Reset original directory to mountpoint
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sudo rm -rf "$DIR"
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mkdir -p "$DIR"
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touch "$DIR/.needs_mount"
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echo "-------------------------------------------------------------------------"
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echo "Storage Stats:"
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echo " Original size: $DIRSIZE"
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echo " Compressed: $(du -sh "${OVERLAY_ROOT}.img" | cut -f1)"
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echo "-------------------------------------------------------------------------"
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# SystemD Service Setup
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SERVICE_CONTENT="[Unit]
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Description=SquashFS Mount for %I
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After=local-fs.target
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[Service]
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Type=oneshot
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RemainAfterExit=yes
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ExecStart=${BIN_DIR}/mount-squash-image %I
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ExecStop=${BIN_DIR}/umount-squash-image %I
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[Install]
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WantedBy=multi-user.target"
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echo "$SERVICE_CONTENT" | sudo tee /etc/systemd/system/squash-mount@.service > /dev/null
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sudo systemctl daemon-reload
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ESC_PATH=$(systemd-escape -p "$DIR")
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SERVICE_NAME="squash-mount@$ESC_PATH.service"
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read -p "Do you want to auto-enable the mount service ($SERVICE_NAME)? [y/N] " yn
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case $yn in
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[Yy]* )
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echo "Enabling and starting service..."
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sudo systemctl enable --now "$SERVICE_NAME"
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sudo systemctl stop "$SERVICE_NAME"
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sudo systemctl start "$SERVICE_NAME"
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;;
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* )
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echo "To enable the service manually, run: sudo systemctl enable --now $SERVICE_NAME"
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;;
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esac
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echo ""
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echo "Your SquashFS-backed folder is ready for use."
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echo "To mount it manually, either cd into it or use mount-squash-image."
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echo ""
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echo "Should you wish to update the contents of the image with your changes made"
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echo "inside of the folder, simply run make-squash-image again on the same"
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echo "folder to update the image."
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echo
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echo "To disable auto-mounting upon cd, please remove the"
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echo ".needs_mount file to prevent that."
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echo
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