Azure devops CI/CD docker build COPY Failed Path not found

Question

I am hosting my own build-agent on my on-premises windows server. However, when I either try to build my docker image using the default agent or my on-premisses agent, it cannot copy the .cproj files.

What I want, is to be able to build this image without the errors. What I have tried so far is:

• Changes work directory to: ../ , ../../ and ~/
• Google for solutions, but this does not result in anything, because it is too specific or something.

Please note that it also does not work on an agent from DevOps itself (windows-2022) Does anyone know what I could have done wrong or overlooked?

Directories:
src/Server/DockerFile
src/Server/Server.csproj
And so on for the other .csproj files

FROM mcr.microsoft.com/dotnet/aspnet:6.0 AS base
ENV ASPNETCORE_URLS=https://+:5005;http://+:5006
WORKDIR /app
EXPOSE 5005
EXPOSE 5006

FROM mcr.microsoft.com/dotnet/sdk:6.0 AS build
WORKDIR /
COPY ["src/Server/Server.csproj", "src/Server/"]
COPY ["src/Application/Application.csproj", "src/Application/"]
COPY ["src/Domain/Domain.csproj", "src/Domain/"]
COPY ["src/Shared/Shared.csproj", "src/Shared/"]
COPY ["src/Infrastructure.Shared/Infrastructure.Shared.csproj", "src/Infrastructure.Shared/"]
COPY ["src/Infrastructure/Infrastructure.csproj", "src/Infrastructure/"]
COPY ["src/Client/Client.csproj", "src/Client/"]
COPY ["src/Client.Infrastructure/Client.Infrastructure.csproj", "src/Client.Infrastructure/"]
RUN dotnet restore "src/Server/Server.csproj" --disable-parallel
COPY . .
WORKDIR "src/Server"
RUN dotnet build "Server.csproj" -c Release -o /app/build

FROM build AS publish
RUN dotnet publish "Server.csproj" -c Release -o /app/publish

FROM base AS final
WORKDIR /app
COPY --from=publish /app/publish .
WORKDIR /app/Files
WORKDIR /app
ENTRYPOINT ["dotnet", "DeDenDannenburcht.Server.dll"]

My Pipeline

Pipeline Output

"C:\Program Files\Docker\Docker\resources\bin\docker.exe" build -f F:\agents\_work\1\s\src\Server\Dockerfile -t dedendannenburcht:166 --label com.azure.dev.image.system.teamfoundationcollectionuri=https://dev.azure.com/JeremiedevosBusiness/ --label com.azure.dev.image.build.sourceversion=ab657210c8696881754f36393adee9da7394ea19 --label image.base.ref.name=mcr.microsoft.com/dotnet/aspnet:6.0 --label image.base.digest=sha256:545da8027d0de13ac88716fc380201f05ad9b4834b5b2fd95eadf277e51318a7 F:\agents\_work\1\s\src\Server
#1 [internal] load build definition from Dockerfile
#1 sha256:5cec5c1a6e883854d5ef516a04f7fbc4f77cc63f74549820c4d061dbb560e514
#1 transferring dockerfile: 1.31kB done
#1 DONE 0.0s

#2 [internal] load .dockerignore
#2 sha256:8f7ecf610ac80d8ac3c3e64e4de2e264ecf11892bf7afc5ff6debe41dd69161b
#2 transferring context: 2B done
#2 DONE 0.0s

#4 [internal] load metadata for mcr.microsoft.com/dotnet/aspnet:6.0
#4 sha256:ac4494cbca04ddb415c76edcbcc7688784c2a6ea65dd656286c013738aa3b75f
#4 DONE 0.0s

#3 [internal] load metadata for mcr.microsoft.com/dotnet/sdk:6.0
#3 sha256:9eb4f6c3944cfcbfe18b9f1a753c769fc35341309a8d4a21f8937f47e94c712b
#3 DONE 0.1s

#5 [base 1/2] FROM mcr.microsoft.com/dotnet/aspnet:6.0
#5 sha256:50f1ddc10932c4a74c7af5704e931a9489c710faea4f2381fe2380827a900e00
#5 DONE 0.0s

#6 [base 2/2] WORKDIR /app
#6 sha256:bc3cf6c390e5fe0e66017b4845c8fcf3e56c7adac9f514a00c2c986024f377a4
#6 CACHED

#7 [final 1/4] WORKDIR /app
#7 sha256:3baba3edbb555769ad9a49e827de88d7dcc4f72ad6e2b42e576964e4a30eac96
#7 CACHED

#8 [build  1/14] FROM mcr.microsoft.com/dotnet/sdk:6.0@sha256:a3dd4dee05cd1369014244d03b28b602e6a2e1650210dd8633322e00379471ec
#8 sha256:ff704f84298cdcbd6cd764720a2e1a4dcd4b44ff415133896e77ad0c5d908001
#8 resolve mcr.microsoft.com/dotnet/sdk:6.0@sha256:a3dd4dee05cd1369014244d03b28b602e6a2e1650210dd8633322e00379471ec done
#8 sha256:0af6b8199917326984baa1452533da610b46f65bfbc5296c7f81cb72d3beec84 2.01kB / 2.01kB done
#8 sha256:dc243ad423c72b21b838c1362ca152823b0b379a546887d8c47c437357576fb2 7.31kB / 7.31kB done
#8 sha256:664e00cfda3df2ac7370c116f04a17d636fc041b62bdd9a0b88a60b987344269 0B / 136.50MB 0.1s
#8 sha256:a3dd4dee05cd1369014244d03b28b602e6a2e1650210dd8633322e00379471ec 2.17kB / 2.17kB done
#8 sha256:4253139ebd4dcee5f7878254306eb794d0f2a80ee4ca8d085d0b9e507412fb1e 0B / 25.36MB 0.1s

#10 sha256:aa96c6c99b71465c230e63fb1edea0588e2b25c39d6b44fc1381e7cbe48c15d9
#10 ERROR: "/src/Server/Server.csproj" not found: not found

#13 [build  5/14] COPY [src/Shared/Shared.csproj, src/Shared/]
#13 sha256:8fd70ae770f73428f5ff667da9b5080dff2b8035dbeb1247fe9e76d5890ad27d
#13 ERROR: "/src/Shared/Shared.csproj" not found: not found

#16 [build  8/14] COPY [src/Client/Client.csproj, src/Client/]
#16 sha256:33c15418c5097a788d8ef568338206ce45e5fea62b707a2be13c136b28ca43e9
#16 ERROR: "/src/Client/Client.csproj" not found: not found

#15 [build  7/14] COPY [src/Infrastructure/Infrastructure.csproj, src/Infrastructure/]
#15 sha256:4f643811b59a89db4a864a2a40a7ff2cc05709c3b123027874b72ff436af0d56
#15 ERROR: "/src/Infrastructure/Infrastructure.csproj" not found: not found

#17 [build  9/14] COPY [src/Client.Infrastructure/Client.Infrastructure.csproj, src/Client.Infrastructure/]
#17 sha256:b7385969b745977db24f702bc1c8f0b931cd675b9f44e70870ae2d918632e9b3
#17 ERROR: "/src/Client.Infrastructure/Client.Infrastructure.csproj" not found: not found

#14 [build  6/14] COPY [src/Infrastructure.Shared/Infrastructure.Shared.csproj, src/Infrastructure.Shared/]
#14 sha256:f101a94226cbf6f38fe9d908da512ded2bd68070207a6dd5c003d8967252c970
#14 ERROR: "/src/Infrastructure.Shared/Infrastructure.Shared.csproj" not found: not found

#12 [build  4/14] COPY [src/Domain/Domain.csproj, src/Domain/]
#12 sha256:152a7025db6bab6e2e456a9ab7ef8436cc9689411341ea38c362df78a0d058c1
#12 ERROR: "/src/Domain/Domain.csproj" not found: not found

#11 [build  3/14] COPY [src/Application/Application.csproj, src/Application/]
#11 sha256:1760818b73b46bb8ebf75492933a413de08fd2ab7a26cae37de4ae4a5f60b83e
#11 ERROR: "/src/Application/Application.csproj" not found: not found
------
 > [build  2/14] COPY [src/Server/Server.csproj, src/Server/]:
------
------
 > [build  3/14] COPY [src/Application/Application.csproj, src/Application/]:
------
------
 > [build  4/14] COPY [src/Domain/Domain.csproj, src/Domain/]:
------
------
 > [build  5/14] COPY [src/Shared/Shared.csproj, src/Shared/]:
------
------
 > [build  6/14] COPY [src/Infrastructure.Shared/Infrastructure.Shared.csproj, src/Infrastructure.Shared/]:
------
------
 > [build  7/14] COPY [src/Infrastructure/Infrastructure.csproj, src/Infrastructure/]:
------
------
 > [build  8/14] COPY [src/Client/Client.csproj, src/Client/]:
------
------
 > [build  9/14] COPY [src/Client.Infrastructure/Client.Infrastructure.csproj, src/Client.Infrastructure/]:
------
failed to compute cache key: "/src/Client.Infrastructure/Client.Infrastructure.csproj" not found: not found
##[error]The process 'C:\Program Files\Docker\Docker\resources\bin\docker.exe' failed with exit code 1
Finishing: Build an image

Answer 1

The Dockerfile is located under src\Server. The Build an image step calls docker build -f .\src\Server\Dockerfile .\src\Server which will not work because that is already one level too deep in the directory tree.

So there are several options:

• Call docker build -f .\src\Server\Dockerfile . from the root directory, but use a custom shell script rather than the official Build an image step - it seems to have that kind of limitation.
• Use relative paths in the Dockerfile like this:

COPY ["../src/Server/Server.csproj", "src/Server/"]

• Move the Dockerfile to the root directory.