The specified RuntimeIdentifier 'linux-linux/amd64' is not recognized

Describe the bug

When building an amd64 container on an arm64 device (MacBook Pro M2) I hit the problem with dotnet restore hanging forever. I mitigated this by using the BUILDPLATFORM env variable in tandem with the 8.0 nightly preview SDK.

FROM --platform=$BUILDPLATFORM mcr.microsoft.com/dotnet/nightly/sdk:8.0-preview as build-env

This worked well 9 days ago but seemingly running the same command now seems to suggest it’s trying to restore a linux-linux/arm64 RID which won’t exist.

To Reproduce

docker buildx build --platform linux/arm64,linux/amd64 --output "type=image,push=true" --no-cache --file ./Dockerfile . --compress --tag "REDACTED"

I have the relevant portion of my Dockerfile below

RUN echo "I am running on ${BUILDPLATFORM}"
RUN echo "building for ${TARGETPLATFORM}"
RUN export TARGETPLATFORM="${TARGETPLATFORM}"

RUN dotnet restore -a $TARGETPLATFORM

which outputs

 => [linux/arm64 build-env 5/9] RUN echo "I am running on linux/arm64"                                                                                                                             0.2s
 => [linux/arm64->amd64 build-env 5/9] RUN echo "I am running on linux/arm64"                                                                                                                      0.2s
 => [linux/arm64->amd64 build-env 6/9] RUN echo "building for linux/amd64"                                                                                                                         0.0s
 => [linux/arm64 build-env 6/9] RUN echo "building for linux/arm64"                                                                                                                                0.1s
 => [linux/arm64->amd64 build-env 7/9] RUN export TARGETPLATFORM="linux/amd64"                                                                                                                     0.1s
 => [linux/arm64 build-env 7/9] RUN export TARGETPLATFORM="linux/arm64"                                                                                                                            0.0s
 => ERROR [linux/arm64 build-env 8/9] RUN dotnet restore -a linux/arm64                                                                                                                            1.4s
 => ERROR [linux/arm64->amd64 build-env 8/9] RUN dotnet restore -a linux/amd64       

Exceptions (if any)

The specified RuntimeIdentifier ‘linux-linux/amd64’ is not recognized

Further technical details

• Include the output of dotnet --info
• The IDE (VS / VS Code/ VS4Mac) you’re running on, and its version

[adamlonsdale]

hello, I can confirm that on Preview 3 when changing TARGETARCH it does indeed resolve the issue and build the container. Thanks!

[richlander]

I just tested it. It works for me, on both x64 and Arm64 (with --platform amd64). Can you try this:

$ pwd
/home/rich/git/dotnet-docker/samples/aspnetapp
$ docker build --pull -t aspnetapp --platform amd64 -f Dockerfile.alpine-non-root .

Please clone the repo and build from this directory to validate: https://github.com/dotnet/dotnet-docker/tree/main/samples/aspnetapp

What I see:

$ docker build --pull -t aspnetapp --platform amd64 -f Dockerfile.alpine-non-root .
[+] Building 10.3s (15/15) FINISHED
 => [internal] load build definition from Dockerfile.alpine-non-root                                               0.0s
 => => transferring dockerfile: 54B                                                                                0.0s
 => [internal] load .dockerignore                                                                                  0.0s
 => => transferring context: 34B                                                                                   0.0s
 => [internal] load metadata for mcr.microsoft.com/dotnet/nightly/aspnet:8.0-preview-alpine                        0.9s
 => [internal] load metadata for mcr.microsoft.com/dotnet/nightly/sdk:8.0-preview-alpine                           0.2s
 => [build 1/6] FROM mcr.microsoft.com/dotnet/nightly/sdk:8.0-preview-alpine@sha256:75a196c1a3484d1d937eb07efb8c0  0.0s
 => [internal] load build context                                                                                  0.0s
 => => transferring context: 6.79kB                                                                                0.0s
 => [stage-1 1/3] FROM mcr.microsoft.com/dotnet/nightly/aspnet:8.0-preview-alpine@sha256:33db03d4f1828a99a0711ecb  0.1s
 => => resolve mcr.microsoft.com/dotnet/nightly/aspnet:8.0-preview-alpine@sha256:33db03d4f1828a99a0711ecb3c403c81  0.0s
 => => sha256:33db03d4f1828a99a0711ecb3c403c81390d85ef34987e35ce8289ef2f44633d 1.11kB / 1.11kB                     0.0s
 => => sha256:382c700816424f91113d9043c82ee1c6aeeb67dae9370d3279b6fa38b5c70997 1.37kB / 1.37kB                     0.0s
 => => sha256:37c042de115a31844c5eeeca9f31619db70727f7cefb8854afd5fe3fc9eaff4c 4.90kB / 4.90kB                     0.0s
 => CACHED [build 2/6] WORKDIR /source                                                                             0.0s
 => CACHED [build 3/6] COPY aspnetapp/*.csproj .                                                                   0.0s
 => [build 4/6] RUN dotnet restore -a amd64                                                                        3.8s
 => [stage-1 2/3] WORKDIR /app                                                                                     0.0s
 => [build 5/6] COPY aspnetapp/. .                                                                                 0.1s
 => [build 6/6] RUN dotnet publish -a amd64 --no-restore -o /app                                                   5.1s
 => [stage-1 3/3] COPY --from=build /app .                                                                         0.1s
 => exporting to image                                                                                             0.1s
 => => exporting layers                                                                                            0.1s
 => => writing image sha256:a696bf37b41ca95dcfdf2f4ec85430b25cedf2e8ddf51470b85b1bc51bb1c46c                       0.0s
 => => naming to docker.io/library/aspnetapp                                                                       0.0s
$ docker inspect aspnetapp -f "{{.Os}}\{{.Architecture}}"
linux\amd64