Gradle Build – Copying custom file and replace with tockenized string

Sudhir Pradhan Trending November 19, 2018 | 0

Post Views: 3,187

Objective

The blog is to copy a file from the project path to build path after the project build completes

Example

Use-case : In my case, I have a Dockerfile in the project root directory. I wanted to copy the file to the build directory once project build completes.

Project structure :

       smartechie-pro
                    |
                     ----- src
                    |
                     ----- build.gradle
                    |
                     ----- Dockerfile
                    |
                     ----- Jnkinsfile
                    |
                     ----- Makefile

After project build (Expected) :

        smartechie-pro
                    |
                     ----- build
                            |
                             >----- classes
                            |
                             >----- libs
                            |
                             >----- resources
                            |
                             >----- tmp
                            |
                             ----- Dockerfile
                    |
                     >----- src
                    |
                     ----- build.gradle
                    |
                     ----- Dockerfile
                    |
                     ----- Jnkinsfile
                    |
                     ----- Makefile

My Docker file content as follows :

FROM openjdk:alpine
MAINTAINER Sudhir Ranjan Pradhan sudhir@smartechie.com
RUN apk –no-cache add ca-certificates
RUN mkdir /@binaryName@
WORKDIR /@binaryName@/
COPY –from=builder /@binaryName@/build .
EXPOSE 16666
CMD java -jar /@binaryName@/libs/@binaryName@-@binaryVersion@.jar

Expected Dockerfile content as follows :

            FROM openjdk:alpine
            MAINTAINER Sudhir Ranjan Pradhan sudhir@smartechie.com
            RUN apk --no-cache add ca-certificates
            RUN mkdir /smartechie-pro
            WORKDIR /smartechie-pro
            COPY --from=builder /smartechie-pro/build .
            EXPOSE 16666
            CMD java -jar /smartechie-pro/libs/smartechie-pro-1.0.0.jar

STEPS to implement :

Open the build.gradle and add the following block of code at the end of the file

            task ('filterCopyDockerfile', type: Copy) {

                println project.buildDir
                println project.rootDir

                from rootDir
                into buildDir
                include 'Dockerfile'

                filter(ReplaceTokens, tokens: [binaryName: 'revrecon-factory-api', binaryVersion: '1.0.0'])
            }
            assemble.dependsOn filterCopyDockerfile