Parametrize appimage-builder recipe,

setup environment in build.sh, start from building amd64 appimage,
download appimage-builder in docker.

.buildbot/appimage/Dockerfile

@@ -19,4 +19,7 @@ RUN apt-get update | true
 
 RUN apt-get install -yq libssl-dev:armhf
 
+RUN wget -qO appimage-builder-x86_64.AppImage \
+    https://github.com/AppImageCrafters/appimage-builder/releases/download/v1.1.0/appimage-builder-1.1.0-x86_64.AppImage
+
 ADD . .

.buildbot/appimage/build.sh

@@ -1,11 +1,38 @@
-#!/bin/sh
+#!/bin/bash
 
-wget -O appimage-builder-x86_64.AppImage \
+export APPIMAGE_EXTRACT_AND_RUN=1
+BUILDER=appimage-builder-x86_64.AppImage
+RECIPE=packages/AppImage/AppImageBuilder.yml
+
+export APP_VERSION=$(python setup.py --version)
+
+function set_sourceline {
+    if [ ${ARCH} == amd64 ]; then
+	export SOURCELINE="deb http://archive.ubuntu.com/ubuntu/ bionic main universe"
+    else
+	export SOURCELINE="deb [arch=${ARCH}] http://ports.ubuntu.com/ubuntu-ports/ bionic main universe"
+    fi
+}
+
+[ -f ${BUILDER} ] || wget -qO ${BUILDER} \
     https://github.com/AppImageCrafters/appimage-builder/releases/download/v1.1.0/appimage-builder-1.1.0-x86_64.AppImage \
-    && chmod +x appimage-builder-x86_64.AppImage
+    && chmod +x ${BUILDER}
 
-APPIMAGE_EXTRACT_AND_RUN=1 ./appimage-builder-x86_64.AppImage \
-			--recipe packages/AppImage/AppImageBuilder.yml
+
+export ARCH=amd64
+export APPIMAGE_ARCH=x86_64
+export RUNTIME=${APPIMAGE_ARCH}
+set_sourceline
+
+./${BUILDER} --recipe ${RECIPE} || exit 1
+
+export ARCH=armhf
+export RUNTIME=gnueabihf
+export CC=arm-linux-gnueabihf-gcc
+export CXX=${CC}
+set_sourceline
+
+./${BUILDER} --recipe ${RECIPE}
 
 mkdir -p ../out
 mv PyBitmessage*.AppImage ../out

packages/AppImage/AppImageBuilder.yml

@@ -2,7 +2,7 @@ version: 1
 script:
   # Remove any previous build
   - rm -rf AppDir  | true
-  - CC=arm-linux-gnueabihf-gcc CXX=arm-linux-gnueabihf-gcc python setup.py install --prefix=/usr --root=AppDir
+  - python setup.py install --prefix=/usr --root=AppDir
 
 AppDir:
   path: ./AppDir
@@ -11,7 +11,7 @@ AppDir:
     id: pybitmessage
     name: PyBitmessage
     icon: pybitmessage
-    version: 0.6.3.2
+    version: !ENV ${APP_VERSION}
     # Set the python executable as entry point
     exec: usr/bin/python
     # Set the application main script path as argument.
@@ -22,9 +22,9 @@ AppDir:
     - sed -i "s|GTK_.*||g" AppDir/AppRun.env
 
   apt:
-    arch: armhf
+    arch: !ENV '${ARCH}'
     sources:
-      - sourceline: 'deb [arch=armhf] http://ports.ubuntu.com/ubuntu-ports/ bionic main universe'
+      - sourceline: !ENV '${SOURCELINE}'
         key_url: 'http://keyserver.ubuntu.com/pks/lookup?op=get&search=0x3b4fe6acc0b21f32'
 
     include:
@@ -67,7 +67,7 @@ AppDir:
       - usr/share/doc
 
   runtime:
-    arch: [ gnueabihf ]
+    arch: [ !ENV '${RUNTIME}' ]
     env:
       # Set python home
       # See https://docs.python.org/3/using/cmdline.html#envvar-PYTHONHOME
@@ -77,4 +77,4 @@ AppDir:
       PYTHONPATH: '${APPDIR}/usr/lib/python2.7/site-packages'
 
 AppImage:
-  arch: armhf
+  arch: !ENV '${APPIMAGE_ARCH}'