Switch build from docbook manual to sphinx

Also remove linearization from qpdf-manual.pdf. It's a small file, and
removing the dependency on the qpdf executable significantly shortens
build times.

2 files changed, 9 insertions, 6 deletions

diff --git a/appimage/Dockerfile b/appimage/Dockerfile
index c607ca21..51221908 100644
--- a/appimage/Dockerfile
+++ b/appimage/Dockerfile
@@ -1,11 +1,13 @@
-FROM ubuntu:16.04
+FROM ubuntu:18.04
+ENV DEBIAN_FRONTEND=noninteractive
 RUN apt-get update && \
     apt-get -y install screen autoconf git sudo \
        build-essential zlib1g-dev libjpeg-dev libgnutls28-dev \
-       docbook-xsl fop xsltproc \
+       python3-pip texlive-latex-extra latexmk \
        inkscape imagemagick busybox-static wget fuse && \
     apt-get clean && \
     rm -rf /var/lib/apt/lists/*
+RUN pip3 install sphinx
 COPY entrypoint /entrypoint
 RUN chmod +x /entrypoint
 ENTRYPOINT [ "/entrypoint" ]
diff --git a/appimage/build-appimage b/appimage/build-appimage
index 03039ed1..04fa805b 100755
--- a/appimage/build-appimage
+++ b/appimage/build-appimage
@@ -43,24 +43,25 @@ if [ "x$1" == "x--sign" ]; then
 fi
 
 
-# Check if we are on Ubuntu Trusty
+# Check Ubuntu Distribution
 _osversion=$(cat /etc/os-release | grep PRETTY_NAME | awk -F'=' '{print $2}' | sed 's#"##g')
 
 # Warn users building the AppImage locally:
-if [[ ! $_osversion =~ Ubuntu\ 16.04.*\ LTS ]]; then
+if [[ ! $_osversion =~ Ubuntu\ 18.04.*\ LTS ]]; then
 set +x
     echo ""
     #    0         1         2         3         4         5         6         7
     #    01234567890123456789012345678901234567890123456789012345678901234567890123456789
     echo "+===========================================================================+"
     echo "|| WARNING: You are about to build a QPDF AppImage on a system which is    ||"
-    echo "|| NOT Ubuntu 16.04 LTS ('Xenial').                                        ||"
+    echo "|| NOT Ubuntu 18.04 LTS.                                                   ||"
     echo "||                                                                         ||"
     echo "||    It is recommended that you use a distribution that is at least a     ||"
     echo "||    few years old to maximize the number of Linux distributions the      ||"
     echo "||    resulting AppImage will work on. AppImages often don't work on       ||"
     echo "||    distributions older than the one they were built on because of       ||"
-    echo "||    standard library differences.                                        ||"
+    echo "||    standard library differences. The oldest supported Ubuntu LTS is     ||"
+    echo "||    a good option.                                                       ||"
     echo "+===========================================================================+"
     echo ""
 set -x