Include AppImage update info

README-maintainer

@@ -140,7 +140,8 @@ cp -rLp ~/.gnupg/. /tmp/build/.gnupg
 docker run --privileged -ti --rm -v /tmp/build:/tmp/build qpdfbuild https://github.com/jberkenbilt/qpdf -b work
 
   The AppImage in /tmp/build/qpdf/appimage/build should be called
-  qpdf-$version-x86_64.AppImage. Move it to the release archive area.
+  qpdf-$version-x86_64.AppImage. Move the AppImage and AppImage.zsync
+  files to the release archive area.
 
 * Create Windows binary releases. In Windows:
   * Extract the source distribution

appimage/Dockerfile

@@ -3,7 +3,7 @@ RUN apt-get update && \
     apt-get -y install screen autoconf git \
        build-essential zlib1g-dev libjpeg-dev \
        docbook-xsl fop xsltproc \
-       inkscape busybox wget fuse && \
+       inkscape busybox-static wget fuse && \
     apt-get clean && \
     rm -rf /var/lib/apt/lists/*
 COPY entrypoint /entrypoint

appimage/build-appimage

@@ -182,8 +182,12 @@ fi
 MAJOR_QPDF_VERSION=$( ./appdir/usr/bin/qpdf --version | grep "qpdf version" | awk '{print $3}' )
 if [ "$TRAVIS_JOB_NUMBER" != "" ]; then
     VERSION=${MAJOR_QPDF_VERSION}-continuous-${TRAVIS_JOB_NUMBER}-$(date "+%Y-%m-%d")-git.$(git rev-parse --short HEAD)
+    UPDATE_FLAG=-g
+    UPDATE_INFO=
 else
     VERSION=${MAJOR_QPDF_VERSION}
+    UPDATE_FLAG=-u
+    UPDATE_INFO="gh-releases-zsync|qpdf|qpdf|latest|qpdf-*x86_64.AppImage.zsync"
 fi
 
 # Remove the default AppRun/symlink and use our own custom AppRun script
@@ -191,7 +195,8 @@ rm appdir/AppRun; cp $top/appimage/AppRun appdir; chmod a+x appdir/AppRun
 
 set +x
 # Finally, generate the AppImage:
-PATH=./squashfs-root/usr/bin:$PATH ./squashfs-root/usr/bin/appimagetool $sign -g $appimagetool_param appdir qpdf-$VERSION-x86_64.AppImage
+PATH=./squashfs-root/usr/bin:$PATH ./squashfs-root/usr/bin/appimagetool $sign $UPDATE_FLAG "$UPDATE_INFO" $appimagetool_param appdir qpdf-$VERSION-x86_64.AppImage
+
 
 # Tell everyone where our result is stored:
 echo ""