Build fails on packages that have build tags that cause no source

[abatilo]

Basically, go get fails under these circumstances:
golang/go#33526

[montanaflynn]

Do you have example error logs or a package that I can reproduce it with?

[abatilo]

I do!

https://gist.github.com/abatilo/174d63a893984803dca9bf728d12e524

The grpc project imports protobuf indirectly and protobuf doesn't have any go files due to build constraints.

You end up with:

⇒  docker build -t cache-failure .
Sending build context to Docker daemon  12.29kB
Step 1/6 : FROM golang:1.14-alpine as backend
 ---> 3289bf11c284
Step 2/6 : RUN CGO_ENABLED=0 GOOS=linux go install -v -a std
 ---> Using cache
 ---> 3db60d6a579f
Step 3/6 : WORKDIR /go/src/cache-failure
 ---> Using cache
 ---> 5b7ec77afa0f
Step 4/6 : COPY ./go.mod ./go.sum ./
 ---> Using cache
 ---> 266966f657d9
Step 5/6 : SHELL ["/bin/ash", "-o", "pipefail", "-c"]
 ---> Using cache
 ---> c9f6bf08680d
Step 6/6 : RUN go mod graph | awk '{if ($1 !~ "@") print $2}' | xargs go get -v
 ---> Running in 7ed8d0467fb8
go: downloading google.golang.org/protobuf v1.25.0
go: downloading google.golang.org/grpc v1.27.0
go: downloading golang.org/x/net v0.0.0-20190311183353-d8887717615a
go: downloading google.golang.org/genproto v0.0.0-20200526211855-cb27e3aa2013
go: downloading github.com/golang/protobuf v1.4.1
go: downloading golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a
go: downloading golang.org/x/text v0.3.0
go get google.golang.org/[email protected]: no Go source files
The command '/bin/ash -o pipefail -c go mod graph | awk '{if ($1 !~ "@") print $2}' | xargs go get -v' returned a non-zero code: 123

I've kind of hacked around the failure by switching the line to:

RUN go mod graph | awk '{if ($1 !~ "@") print $2}' | xargs -I{} ash -c "go get -v {} || true"

There might be a better option but I'm not sure of one.