How build a Dockerfile in a Subdirectory using a Jenkinsfile

Question

I have a github repository with a declarative pipeline Jenkinsfile. The workingdirectory on my node contains subdirectories.

The project is a simple empty linkx docker project created with visual studio 2017 and .net core 2.1. It executes on my windows 7 machine normally and has a hello world web page.

I am unable to build the Dockerfile on jenkins. I can start the Dockerfile build using dir(...){} . The failing step is always

COPY ["MyProject/MyProject.csproj", "MyProject/"]

This step requires the relative path to be in MySolution .

The file Workspace/MySolution/MyProject/MyProject.csproj exists

The error Message is that Workspace/MyProject/MyProject.csproj does not exist.

I searched exhaustively using google and stackoverflow. Among the things I tries are combinations of sh commands, dir syntax, options on docker build like -f . Some of them were straigth up failures and the best results I had ran into the COPY step issue.

One example of a failing step in the Jenkinsfile would be:

dir("MySolution/MyProject")
{
    script
    {
        docker.build("MyProject", ".")
    }
}

This fails with the COPY issue from above.

I have seen questions on so that seem to not quite apply here and which solutions did not transfer to this issue.

Answer 1

It turns out I ended up really close to the solution of my issue. This fixed my sub folder problem:

dir("MySolution")
{
    script
    {
        docker.build("MyProject", "-f ./MyProject/Dockerfile .")
    }
}