The Dockerfile File in the Docker Demonstration for the Visual COBOL Base Image

This topic lists and describes the Dockerfile file from the Docker demonstration for the Visual COBOL base image. The Dockerfile is listed in its entirety and a following table describes the various Dockerfile commands. The line numbers in the listings of the Dockerfile have been added to aid readability. They are not present in the supplied Dockerfile.

001  # Copyright (C) Micro Focus 2018. All rights reserved. 
002  
003  ARG BASE_SUFFIX=
004  FROM microsoft/dotnet-framework${BASE_SUFFIX}
005  
006  # PRODUCT_VERSION is product version associated with this Dockerfile
007  # MFLICFILE is the build-arg for the license filename
008  # ACCEPT_CONTAINER_EULA is the build-arg for the acceptance of the end user license argument
009  # SETUP_EXE is the build-arg name for installer exe to be used
010  # TOOLS_LOC is build-arg name for installation location of the tools
011  # JAVATARFILE is the build-arg name for on-disk file that contains the oracle server jre
012  # JAVAHOMEDIR is the build-arg name for location of the java installation
013  ARG PRODUCT_VERSION=4.0.00232
014  ARG MFLICFILE
015  ARG ACCEPT_CONTAINER_EULA=no
016  ARG SETUP_EXE=vcbt_40.exe
017  ARG TOOLS_LOC=c:\\VCTools
018  ARG JAVATARFILE=server-jre-8u162-windows-x64.tar.gz
019  ARG JAVAHOMEDIR=c:\\jdk1.8.0_162
020  ARG TMP_INST_DIR=c:\\vc40tmp
021  
022  LABEL vendor="Micro Focus" \
023        com.microfocus.name="Visual COBOL" \
024        com.microfocus.version="$PRODUCT_VERSION" \
025        com.microfocus.eula.url="https://supportline.microfocus.com/licensing/agreements.aspx" \
026        com.microfocus.is-base-image="true" \
027        com.microfocus.third_parties.java="oraclejava8"
028  
029  # transfer build arguments to environment vars
030  ENV TOOLS_LOC=${TOOLS_LOC} \
031      RMT_DIR="C:\\Program Files (x86)\\Common Files\\SafeNet Sentinel\\Sentinel RMS License Manager\\WinNT"
032  
033  # Use cmd.exe, the microsoft/dotnet-framework-build changes this to powershell, so we need to reset
034  SHELL ["cmd", "/S", "/C"]
035  
036  # Copy the setup .exe and license to the image
037  COPY ${SETUP_EXE} "${TMP_INST_DIR}\\"
038  COPY ${MFLICFILE} "${TOOLS_LOC}\\"
039  
040  # Do the actual installation
041  WORKDIR "${TMP_INST_DIR}"
042  RUN set TMP_INST_DIR=${TMP_INST_DIR} && \
043      set SETUP_EXE=${SETUP_EXE} && \
044      set ACCEPT_CONTAINER_EULA=${ACCEPT_CONTAINER_EULA} && \
045      cd %TMP_INST_DIR% && start "" /wait %SETUP_EXE% /q "InstallFolder=%TOOLS_LOC%" /l log.txt accepteula=%ACCEPT_CONTAINER_EULA%
046  
047  # Check log.txt
048  RUN cd %TMP_INST_DIR% && \
049      findstr /ic:"Exit Code: 0x0" log.txt || (echo "Install failed - error messages in log.txt" && findstr /ic:"error" log.txt && findstr /ic:"Exit Code:" log.txt && exit 1)
050  
051  # License the image
052  RUN set TOOLS_LOC=${TOOLS_LOC} && \
053      set MFLICFILE=${MFLICFILE} && \
054      cd %TOOLS_LOC% && \
055      "%RMT_DIR%\\MFLicenseAdmin.exe" -install %MFLICFILE%
056  
057  # Copy java .tar.gz and setup PATH
058  ENV JAVA_HOME=${JAVAHOMEDIR}
059  ADD ${JAVATARFILE} /
060  
061  # Setup ANT on PATH and ANT_HOME
062  RUN set TOOLS_LOC=${TOOLS_LOC} && \
063      setx /M PATH "%PATH%;%JAVA_HOME%\bin;%ANT_HOME%\bin" && \
064      setx /M ANT_HOME "%TOOLS_LOC%\ant"
065  
066  # Cleaup directory
067  RUN set TMP_INST_DIR=${TMP_INST_DIR} && \
068      cd \ && rmdir /S /Q %TMP_INST_DIR%
069  
070  # set the default directory to tools directory
071  WORKDIR "${TOOLS_LOC}"

The commands on the lines in this Dockerfile are as follows:

Lines	Description
003 - 004	Specifies that the base image to use is the official Docker image for .NET Framework on Windows Server 2016 Server Core.
013 - 020	Define build arguments passed by the docker build command: PRODUCT_VERSION. Indicates the version of Visual COBOL that this Dockerfile is supplied with. MFLICFILE. Specifies the name of the license file to use for Visual COBOL. ACCEPT_CONTAINER_EULA. Indicates acceptance of the terms laid out in the license agreement. The default setting of "no" means that you must modify this in order to indicate that you accept the terms of the license agreement. SETUP_EXE. Specifies the name of the Visual COBOL installation file. The default setting is the name of the file supplied with Visual COBOL. TOOLS_LOC. Specifies the folder into which Visual COBOL will be installed. JAVATARFILE. Specifies the name of the .tar file containing the files to provide Java support. This file is supplied in the VCBuildTools folder of the vc_build_tools_dockerfiles_4.0_windows.zip file. The files in it must be included in the image if Java support is required. JAVAHOMEDIR. Specifies the name of the folder in the image's filesystem into which the files from the JAVATARFILE .tar file will be extracted. TMP_INST_DIR. Specifies a temporary directory to be used while building the image. It is deleted when it is no longer needed.
022 - 027	Specify the metadata labels for the image that will be created. These labels can be queried using the docker inspect command.
030 - 031	Create environment variables to be used in this Dockerfile: TOOLS_LOC is copied from the build argument defined previously. RMT_DIR specifies the location of the COBOL licensing management software. This is installed when you install Visual COBOL.
034	Specifies that the shell to be used for subsequent instructions is `["cmd", "/S", "/C"]`. This is the default for Dockerfiles on Windows but needs to be specified explicitly here because the base image for this Dockerfile is a Microsoft .NET Framework "-build" image, and using that image causes PowerShell to be used as the shell.
037 - 038	Copies the Visual COBOL installation file into the temporary folder and the Visual COBOL license file into the folder where Visual COBOL is to be installed.
041 - 045	Run the Visual COBOL installation file specifying parameters to install it silently, into the required directory, creating a log file, and indicating that you have accepted the terms laid out in the license agreement.
048 - 049	Runs a series of concatenated Windows commands to search the Visual COBOL installation log file for text indicating that the installation failed. If any such text is found no further processing takes place.
052 - 055	Run a series of concatenated Windows commands to license Visual COBOL.
058 - 059	Enables support for Java by unzipping the files in the file specified by JAVATARFILE and setting the JAVA_HOME environment variable.
062 - 064	Run a series of concatenated Windows commands to enable support for Ant.
067 - 068	Runs a series of concatenated Windows commands to delete the Visual COBOL installation file and the temporary directory that was used to contain it.
071	Sets the Docker working directory to be the directory into which Visual COBOL was installed.