A script fetch and convert a Lagrange AppImage to a system installable package

cnvtlag.sh

#!/bin/sh -eu
# A script convert a Lagrange AppImage to a system installable package

# Determine if a local package should be used or if one should be fetched
if [ -n "${1:-}" ]; then
  APPIMAGE="$1"
else
  case "$(uname -m)" in
    arm*) APPIMAGE_ARCH=armhf ;;
       *) APPIMAGE_ARCH="$(uname -m)" ;;
  esac
  APPIMAGE_VERSION="$(wget -qO- https://git.skyjake.fi/gemini/lagrange/releases | grep -o '/gemini/lagrange/src/tag/v[0-9\.]\+' | cut -dv -f2 | head -n 1)"
  [ -z "$APPIMAGE_VERSION" ] && { echo "Could not work out version"; exit 1 ; }
  [ -e "${XDG_DOWNLOAD_DIR:-$HOME/Downloads}/Lagrange-${APPIMAGE_VERSION}-${APPIMAGE_ARCH}.bin.tgz" ] && { echo "${XDG_DOWNLOAD_DIR:-$HOME/Downloads}/Lagrange-${APPIMAGE_VERSION}-${APPIMAGE_ARCH}.bin.tgz is already present"; exit ; }
  if ! [ -e "${XDG_DOWNLOAD_DIR:-$HOME/Downloads}/Lagrange-${APPIMAGE_VERSION}-${APPIMAGE_ARCH}.AppImage" ]; then
    wget -P "${XDG_DOWNLOAD_DIR:-$HOME/Downloads}" https://git.skyjake.fi/gemini/lagrange/releases/download/v${APPIMAGE_VERSION}/Lagrange-${APPIMAGE_VERSION}-x86_64.AppImage
  fi
  APPIMAGE="${XDG_DOWNLOAD_DIR:-$HOME/Downloads}/Lagrange-${APPIMAGE_VERSION}-${APPIMAGE_ARCH}.AppImage"
fi

# Check that a valid Lagrange AppImage name was provided and it is present and readable
[ -r "$APPIMAGE" ] || { echo "$APPIMAGE is not present"; exit 1; }
echo "$APPIMAGE" | grep -q 'Lagrange-[0-9\.]\+-[a-z0-9\_]\+\.AppImage$' || { echo "$APPIMAGE is not named like a Lagrange AppImage"; exit 1; }

# Define basic variables, if they are incorrect of not defined
echo "$APPIMAGE" | grep -q '^/' || APPIMAGE="$(realpath "$APPIMAGE")"
[ -n "${APPIMAGE_VERSION:-}" ] || APPIMAGE_VERSION="$(echo "$APPIMAGE" | sed 's,.*/,,' | cut -d- -f2)"
[ -n "${APPIMAGE_ARCH:-}" ] || APPIMAGE_ARCH="$(echo "$APPIMAGE" | sed 's,.*/,,' | cut -d- -f3 | cut -d. -f1)"

# Extract AppImage contents
APPIMAGE_STAGING_DIR="$(mktemp -d)/lagrange"
unsquashfs -n -q -d "$APPIMAGE_STAGING_DIR" -o "$(expr $(grep -Pabom1 '\x00hsqs' "$APPIMAGE" | cut -d: -f1) + 1)" "$APPIMAGE" usr

# Reorganise the contents
cd "$APPIMAGE_STAGING_DIR"
mkdir opt
mv usr opt/Lagrange
mkdir -p usr/local/bin usr/local/share/applications usr/local/share/icons/hicolor/256x256/apps usr/local/share/man/man1
ln -s ../../../opt/Lagrange/bin/lagrange usr/local/bin/lagrange
ln -s ../../../../opt/Lagrange/share/applications/fi.skyjake.Lagrange.desktop usr/local/share/applications/fi.skyjake.Lagrange.desktop
ln -s ../../../../../../../opt/Lagrange/share/icons/hicolor/256x256/apps/fi.skyjake.Lagrange.png usr/local/share/icons/hicolor/256x256/apps/fi.skyjake.Lagrange.png
ln -s ../../../../../opt/Lagrange/share/man/man1/lagrange.1 usr/local/share/man/man1/lagrange.1

# Create a tar package from the AppImage contents
find usr opt ! -type d | tar cafTH "${XDG_DOWNLOAD_DIR:-$HOME/Downloads}/Lagrange-${APPIMAGE_VERSION}-${APPIMAGE_ARCH}.bin.tgz" - ustar --owner=root --group=root

# Cleanup
cd - >/dev/null
rm -r "${APPIMAGE_STAGING_DIR%%/lagrange}"

# Inform the user
cat <<EOF
Created: ${XDG_DOWNLOAD_DIR:-$HOME/Downloads}/Lagrange-${APPIMAGE_VERSION}-${APPIMAGE_ARCH}.bin.tgz

To install:

  sudo tar Cfx / Lagrange-${APPIMAGE_VERSION}-${APPIMAGE_ARCH}.bin.tgz

To remove:

  sudo rm -r /opt/Lagrange /usr/local/share/{applications,icons/hicolor/256x256/apps,man/man1}/*[Ll]agrange.*
EOF