build: Added AppImage builder (#355)

* Docker files to create an AppImage

* Using ENTRYPOINT is a bit nicer here

* typo

* put with other dist files

dist/AppImage/AppRun

@@ -0,0 +1,12 @@
+#!/bin/sh
+SELF=$(readlink -f "$0")
+HERE=${SELF%/*}
+export PATH="${HERE}/usr/bin/:${HERE}/usr/sbin/:${HERE}/usr/games/:${HERE}/bin/:${HERE}/sbin/${PATH:+:$PATH}"
+export LD_LIBRARY_PATH="${HERE}/usr/lib/:${HERE}/usr/lib/i386-linux-gnu/:${HERE}/usr/lib/x86_64-linux-gnu/:${HERE}/usr/lib32/:${HERE}/usr/lib64/:${HERE}/lib/:${HERE}/lib/i386-linux-gnu/:${HERE}/lib/x86_64-linux-gnu/:${HERE}/lib32/:${HERE}/lib64/${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}"
+export PYTHONPATH="${HERE}/usr/share/pyshared/${PYTHONPATH:+:$PYTHONPATH}"
+export XDG_DATA_DIRS="${HERE}/usr/share/${XDG_DATA_DIRS:+:$XDG_DATA_DIRS}"
+export PERLLIB="${HERE}/usr/share/perl5/:${HERE}/usr/lib/perl5/${PERLLIB:+:$PERLLIB}"
+export GSETTINGS_SCHEMA_DIR="${HERE}/usr/share/glib-2.0/schemas/${GSETTINGS_SCHEMA_DIR:+:$GSETTINGS_SCHEMA_DIR}"
+export QT_PLUGIN_PATH="${HERE}/usr/lib/qt4/plugins/:${HERE}/usr/lib/i386-linux-gnu/qt4/plugins/:${HERE}/usr/lib/x86_64-linux-gnu/qt4/plugins/:${HERE}/usr/lib32/qt4/plugins/:${HERE}/usr/lib64/qt4/plugins/:${HERE}/usr/lib/qt5/plugins/:${HERE}/usr/lib/i386-linux-gnu/qt5/plugins/:${HERE}/usr/lib/x86_64-linux-gnu/qt5/plugins/:${HERE}/usr/lib32/qt5/plugins/:${HERE}/usr/lib64/qt5/plugins/${QT_PLUGIN_PATH:+:$QT_PLUGIN_PATH}"
+EXEC=$(grep -e '^Exec=.*' "${HERE}"/*.desktop | head -n 1 | cut -d "=" -f 2 | cut -d " " -f 1)
+exec "${EXEC}" "$@"

dist/AppImage/Dockerfile

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+FROM debian:bullseye-slim
+LABEL maintainer Example <example@example.com>
+
+ARG TAG=master
+
+USER root
+
+# Bring packages up to date
+RUN apt-get update \
+    && apt-get upgrade -y \
+    && apt-get autoremove -y \
+    && apt-get install -y \
+        git \
+        cmake \
+        curl \
+        libfuse2 \
+        file
+
+# Fetch source and dependencies
+RUN mkdir -p /source \
+    && cd /source \
+    && git clone https://github.com/WerWolv/ImHex.git \
+    && cd ImHex \
+    && git checkout $TAG \
+    && git submodule update --init --recursive \
+    && cd /source/ImHex/dist \
+    && ./get_deps_debian.sh
+
+ARG CXX=g++-10
+
+# Build ImHex
+RUN mkdir -p /source/ImHex/build \
+    && cd /source/ImHex/build \
+    && cmake --install-prefix /usr -DCMAKE_BUILD_TYPE=Release .. \
+    && make -j
+
+# Prepare for AppImage
+RUN mkdir -p /source/ImHex.AppDir/usr/bin \
+    && mkdir -p /source/ImHex.AppDir/usr/lib \
+    && mkdir -p /source/ImHex.AppDir/usr/share/imhex/plugins \
+    && cp /source/ImHex/build/imhex /source/ImHex.AppDir/usr/bin/imhex \
+    && cp /source/ImHex/build/plugins/builtin/builtin.hexplug /source/ImHex.AppDir/usr/share/imhex/plugins
+
+COPY AppRun ImHex.desktop imhex.png /source/ImHex.AppDir/
+#RUN inkscape -z -o /source/ImHex.AppDir/imhex.png -w 128 -h 128 /source/ImHex/res/icon.svg
+
+# Gather the needed libraries
+RUN chmod a+x /source/ImHex.AppDir/AppRun \
+    && ldd /source/ImHex/build/imhex | awk '/ => /{print $3}' | xargs -I '{}' cp '{}' /source/ImHex.AppDir/usr/lib
+
+# Package the prepared AppDir
+RUN cd /source \
+    && curl -L https://github.com/AppImage/AppImageKit/releases/download/13/appimagetool-x86_64.AppImage -o appimagetool-x86_64.AppImage \
+    && chmod a+x appimagetool-x86_64.AppImage
+
+# All that remains is the following. However, due to docker limitations with fuse
+# this cannot be done in a build container.
+#
+# /source/appimagetool-x86_64.AppImage ImHex.AppDir
+
+ENTRYPOINT sh -c '/source/appimagetool-x86_64.AppImage /source/ImHex.AppDir; sleep 60'

dist/AppImage/ImHex.desktop

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+[Desktop Entry]
+Name=ImHex
+Exec=imhex
+Icon=imhex
+Type=Application
+Categories=Utility;

dist/AppImage/README.md

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+The environment variable TAG can be set to build for a specific git tag. Without the master branch is build.
+
+First run `build.sh` to create a docker image. Then run `extract.sh` to get an AppImage.

dist/AppImage/build.sh

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+#!/bin/bash
+
+# Set the TAG environment variable to build a specific tag
+
+# Make sure we're in the same direcotry as this script
+pushd $(dirname "$(realpath "$0")")
+
+if [ -z "$TAG" ]; then
+    docker build -t imhex-appimage-build .
+else
+    docker build --build-arg=TAG=$TAG -t imhex-appimage-build-$TAG .
+fi
+
+popd

dist/AppImage/extract.sh

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+#!/bin/bash
+
+# Set the TAG environment variable to move to a versioned name while extracting
+
+# Make sure we're in the same direcotry as this script
+pushd $(dirname "$(realpath "$0")")
+
+# Remove old containers
+docker rm imhex 2>&1 > /dev/null
+
+# AppImage uses FUSE, which makes --device /dev/fuse --cap-add SYS_ADMIN necessary here
+# on Debian --security-opt apparmor:unconfined is also needed
+if [ -z "$TAG" ]; then
+    docker run -d --device /dev/fuse --cap-add SYS_ADMIN --security-opt apparmor:unconfined --name imhex imhex-appimage-build
+else
+    docker run -d --device /dev/fuse --cap-add SYS_ADMIN --security-opt apparmor:unconfined --name imhex imhex-appimage-build-$TAG
+fi
+sleep 10
+docker cp imhex:/ImHex-x86_64.AppImage .
+
+# Move to tagged name if $TAG set
+if [ -n "$TAG" ]; then
+    mv ImHex-x86_64.AppImage ImHex-${TAG}-x86_64.AppImage
+fi
+
+popd