Docker-Alpine-MuPDF

A program runs to extra the thumbnail and table of contents by mupdf and crontab in the docker alpine

Git clone and Download the mupdf and unzip the source from zip to 'source' folder

wget https://mupdf.com/downloads/archive/mupdf-1.17.0-source.tar.gz
unzip mupdf-1.17.0-source.tar.gz
mv mupdf-1.17.0-source source
docker build . -t alpine-mupdf
docker-compose --compatibility  up -d --force-recreate

Convert shell

#!/bin/sh
lock_dir=/var/tmp/mylock
pid_file=/var/tmp/mylock/pid
pdf_folder='/opt/data/pdf/*.pdf'
toc_path='/opt/data/toc'
thumbnail_path='/opt/data/thumbnail'
if (mkdir ${lock_dir}) 2>/dev/null; then
        echo $$ >${pid_file}
        echo  `date`':run'
        trap 'rm -rf "$lock_dir"; exit $?' INT TERM EXIT
        # start the program
        for _pdf_ in $pdf_folder; do
                _toc_csv_=$toc_path'/'"$(basename ${_pdf_} .pdf)"'.csv'
                if [ -f "${_toc_csv_}" ]; then
                        echo "${_toc_csv_} exists."
                else
                        mutool show ${_pdf_} outline > ${_toc_csv_}
                fi
                _thumbnail_png_=$thumbnail_path'/'"$(basename ${_pdf_} .pdf)"'.png'
                if [ -f "${_thumbnail_png_}" ]; then
                        echo "${_thumbnail_png_} exists."
                else
                        mutool draw -o ${_thumbnail_png_} -F png ${_pdf_} 1-1 
                fi
        done
        # clean up
        rm -rf "${lock_dir}"
        trap - INT TERM EXIT
else
        echo "Lock Exists: ${lock_dir} owned by $(cat ${pid_file})"
fi