Update Ubuntu dockerfile

.docker/Dockerfile

@@ -1,17 +1,60 @@
 # OCRmyPDF
 #
-FROM      ubuntu:18.04
+FROM ubuntu:19.04 as base
+
+FROM base as builder
+
+ENV LANG=C.UTF-8
 
 RUN apt-get update && apt-get install -y --no-install-recommends \
   build-essential autoconf automake libtool \
   libleptonica-dev \
   zlib1g-dev \
-  libexempi3 \
   ocrmypdf \
   pngquant \
   python3-pip \
   python3-venv \
   tesseract-ocr \
+  unpaper \
+  wget \
+  git
+
+
+# Compile and install jbig2
+# Needs libleptonica-dev, zlib1g-dev
+RUN \
+  mkdir jbig2 \
+  && wget -q https://github.com/agl/jbig2enc/archive/0.29.tar.gz -O - | \
+  tar xz -C jbig2 --strip-components=1 \
+  && cd jbig2 \
+  && ./autogen.sh && ./configure && make && make install \
+  && cd .. \
+  && rm -rf jbig2
+
+RUN python3 -m venv /appenv
+
+COPY . /app
+
+WORKDIR /app
+
+RUN . /appenv/bin/activate; \
+  pip install --upgrade pip \
+  && pip install .
+
+FROM base
+
+ENV LANG=C.UTF-8
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+  ghostscript \
+  img2pdf \
+  liblept5 \
+  zlib1g \
+  pngquant \
+  python3 \
+  python3-venv \
+  qpdf \
+  tesseract-ocr \
   tesseract-ocr-chi-sim \
   tesseract-ocr-deu \
   tesseract-ocr-eng \
@@ -21,52 +64,18 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
   unpaper \
   wget
 
+# Copy
+COPY --from=builder /app/misc/webservice.py /app/
 
-ENV LANG=C.UTF-8
+# Copy minimal project files to get the test suite.
+COPY --from=builder /app/setup.cfg /app/setup.py /app/README.md /app/
+COPY --from=builder /app/requirements /app/requirements
+COPY --from=builder /app/tests /app/tests
+COPY --from=builder /app/src /app/src
 
-# Compile and install jbig2
-# Needs libleptonica-dev, zlib1g-dev
-RUN \
-  mkdir jbig2 \
-  && wget -q https://github.com/agl/jbig2enc/archive/0.29.tar.gz -O - | \
-      tar xz -C jbig2 --strip-components=1 \
-  && cd jbig2 \
-  && ./autogen.sh && ./configure && make && make install \
-  && cd .. \
-  && rm -rf jbig2
+COPY --from=builder /appenv /appenv
+COPY --from=builder /usr/local /usr/local
 
-RUN apt-get remove -y autoconf automake libtool
+WORKDIR /data
 
-RUN python3 -m venv --system-site-packages /appenv
-
-# This installs the latest binary wheel instead of the code in the current
-# folder. Installing from source will fail, apparently because cffi needs
-# build-essentials (gcc) to do a source installation
-# (i.e. "pip install ."). It's unclear to me why this is the case.
-RUN . /appenv/bin/activate; \
-  pip install --upgrade pip \
-  && pip install --upgrade ocrmypdf
-
-# Now copy the application in, mainly to get the test suite.
-# Do this now to make the best use of Docker cache.
-COPY . /application
-RUN . /appenv/bin/activate; \
-  pip install -r /application/requirements/test.txt
-
-# Remove the junk, including the source version of application since it was
-# already installed
-RUN rm -rf /tmp/* /var/tmp/* /root/* /application/ocrmypdf \
-  && apt-get remove -y build-essential \
-  && apt-get autoremove -y \
-  && apt-get autoclean -y
-
-RUN useradd docker \
-  && mkdir /home/docker \
-  && chown docker:docker /home/docker
-
-USER docker
-WORKDIR /home/docker
-
-# Must use array form of ENTRYPOINT
-# Non-array form does not append other arguments, because that is "intuitive"
-ENTRYPOINT ["/application/.docker/docker-wrapper.sh"]
+ENTRYPOINT ["/appenv/bin/ocrmypdf"]