Azure pipeline docker fails copy with multiple projects - azure-devops

Question

Copying of Data.csproj to Data/ is failing when building my app in azure devops. Though, the first copy command, Api.csproj to Api/ is working fine. Do note that I did not specify the buildContext on my azure-pipeline.yml file. But, when I did add the buildContext, buildContext: '$(Build.Repository.LocalPath)', it failed even on the first copy.
Any inputs or suggestion on how to fix this one? I tried searching and adding the buildcontext or adding the folder on the csproj doesn't seem to work. For example, COPY ["/Data/Data.csproj", "Data/"]
This is my folder structure (my azure-pipeline.yml file is outside the App folder):
App
- Api/
- Api.csproj
- Dockerfile
- Data/
- Data.csproj
- Domain/
- Domain.csproj
- App.sln
My dockerfile:
FROM mcr.microsoft.com/dotnet/core/aspnet:3.1-buster-slim AS base
WORKDIR /app
EXPOSE 80
EXPOSE 443
FROM mcr.microsoft.com/dotnet/core/sdk:3.1-buster AS build
WORKDIR /src
COPY ["Api.csproj", "Api/"]
COPY ["Data.csproj", "Data/"]
COPY ["Domain.csproj", "Domain/"]
RUN dotnet restore "Api/Api.csproj"
COPY . .
WORKDIR "/src/Api"
RUN dotnet build "Api.csproj" -c Release -o /app/build
FROM build AS publish
RUN dotnet publish "Api.csproj" -c Release -o /app/publish
FROM base AS final
WORKDIR /app
COPY --from=publish /app/publish .
ENTRYPOINT ["dotnet", "Api.dll"]
parts of my azure-pipeline.yml
stages:
- stage: Build
displayName: Build stage
jobs:
- job: Build
displayName: Build
pool:
vmImage: 'ubuntu-latest'
steps:
- task: Docker#2
displayName: Build and push an image to container registry
inputs:
command: buildAndPush
repository: 'App'
dockerfile: '**/Dockerfile'
tags: |
$(tag)
Here's the error:
Step 6/28 : WORKDIR /src
---> Running in 266a78d293ee
Removing intermediate container 266a78d293ee
---> 2d899fafdf05
Step 7/28 : COPY ["Api.csproj", "Api/"]
---> 92c8c1450c3c
Step 8/28 : COPY ["Data.csproj", "Data/"]
COPY failed: stat /var/lib/docker/tmp/docker-builder764823890/Data.csproj: no such file or directory
##[error]COPY failed: stat /var/lib/docker/tmp/docker-builder764823890/Data.csproj: no such file or directory
##[error]The process '/usr/bin/docker' failed with exit code 1

Answer 1

Okay, after trying so many times, I was able to fix this by changing the dockerfile and azure-pipelines.yml.
I think what fixed the issue is to specifically set the buildContext to 'App/' instead of the variable '$(Build.Repository.LocalPath)' that I'm not sure what's the exact value.
I'll just post the part that I made changes to.
Dockerfile
COPY ["Api/Api.csproj", "Api/"]
COPY ["Data/Data.csproj", "Data/"]
COPY ["Domain/Domain.csproj", "Domain/"]
azure-pipelines.yml
inputs:
command: buildAndPush
repository: $(imageRepository)
dockerfile: $(dockerfilePath)
buildContext: 'App/'