AppImage2Deb

appimage-to-deb.sh

#!/bin/bash

# About: This script turns AppImages into regular old .deb files which install the app to /opt/${APP_NAME} and handle icons and .desktop file

fatal() {
	echo $@
	exit 1
}

[[ -x $(which fakeroot) ]] || fatal "Missing fakeroot. Run 'sudo apt-get install fakeroot'"
APP_IMAGE=$(readlink -f $1)
APP_DIR=$(dirname $APP_IMAGE)

if [ -f ${APP_IMAGE} ]; then
	if [ ! -x ${1} ]; then
		chmod +x "${APP_IMAGE}"
	fi
	OFFSET=$(${APP_IMAGE} --appimage-offset)
	if [ $? -ne 0 ]; then
		MOUNT_OPTIONS="-o loop"
	else
		if [ ${OFFSET} -gt 0 ]; then
			MOUNT_OPTIONS="-o offset=${OFFSET}"
		else
			fatal "AppImage offset is ${OFFSET} which just seems wrong"
		fi
	fi
else
	fatal "Usage: $0 <App.AppImage>"
fi

MOUNT_DIR=$(mktemp -d)
sudo mount ${MOUNT_OPTIONS} "$APP_IMAGE" "${MOUNT_DIR}" || fatal "Failed command: 'mount ${MOUNT_OPTIONS} ${APP_IMAGE} ${MOUNT_DIR}'"

DEB_SRC=$(mktemp -d)
mkdir -p "${DEB_SRC}/opt/"
mkdir -p "${DEB_SRC}/usr/share/applications"

ICON_FILE=$(find "${MOUNT_DIR}" -maxdepth 1 -type l -name '*.png' -o -name '*.svc')
if [ -f "${ICON_FILE}" ]; then
	ICON_NAME=$(basename ${ICON_FILE%.*})
else
	ICON_NAME=${APP_NAME}
fi

DESKTOP_FILE=$(find "${MOUNT_DIR}" -maxdepth 1 -type f -name '*.desktop')
if [ -f "${DESKTOP_FILE}" ]; then
	APP_NAME=$(awk -F= '$1 == "Name" { print $2 }' "${DESKTOP_FILE}")
	APP_DESC=$(awk -F= '$1 == "Comment" { print $2 }' "${DESKTOP_FILE}")
	cat ${DESKTOP_FILE} \
	| sed "s#Exec=AppRun.*#Exec=/opt/${APP_NAME}/AppRun#" \
	| sed "s#Icon=.*#Icon=${ICON_NAME}#" \
        > "${DEB_SRC}/usr/share/applications/${APP_NAME}.desktop"
else
	APP_NAME=$(basename ${APP_IMAGE%.*})
	APPDESC="${APP_NAME} for Desktop"
	cat <<-EOF > "${DEB_SRC}/usr/share/applications/${APP_NAME}.desktop"
	[Desktop Entry]
	Name=${APP_NAME}
	Exec=/opt/${APP_NAME}/AppRun --no-sandbox %U
	Comment=${APP_DESC}
	Terminal=false
	Type=Application
	Icon=${ICON_NAME}
	EOF
fi

mkdir -p ${DEB_SRC}/DEBIAN
cat <<EOF > ${DEB_SRC}/DEBIAN/control
Package: ${APP_NAME}
Version: $(date +%Y%m%d%H)
Architecture: all
Maintainer: AppImage2Deb
Installed-Size: $(du -s "${MOUNT_DIR}" | awk '{print $1}')
Section: Miscellaneous
Priority: optional
Description: ${APP_DESC}
EOF

cat <<EOF > ${DEB_SRC}/DEBIAN/postinst
#!/bin/sh
update-desktop-database
EOF

cat <<EOF > ${DEB_SRC}/DEBIAN/postrm
#!/bin/sh
update-desktop-database
EOF

chmod 775 ${DEB_SRC}/DEBIAN/post*

# Copy files to package source directory
cp -a "${MOUNT_DIR}" "${DEB_SRC}/opt/${APP_NAME}"
if [ -d "${MOUNT_DIR}/usr/share/icons" ]; then
	cp -a "${MOUNT_DIR}/usr/share/icons" "${DEB_SRC}/usr/share/"
fi
sudo umount "${MOUNT_DIR}" && rmdir "${MOUNT_DIR}"

# Generate package md5sums
find "${DEB_SRC}" -type f -not -path "${DEB_SRC}/DEBIAN/*" -exec md5sum {} \; \
| sed "s%${DEB_SRC}/%%" \
> ${DEB_SRC}/DEBIAN/md5sums

# Build the package
fakeroot dpkg-deb -b "${DEB_SRC}" "${APP_DIR}/${APP_NAME}.deb"

Fails if AppImage app name contains spaces:

dpkg-deb: error: parsing file '/tmp/tmp.StcPOxKWl2/DEBIAN/control' near line 1:
 invalid package name in 'Package' field: character ' ' not allowed (only letters, digits and characters '-+._')