I had a small go application building successfully. I had the go.mod and
main.go in the root directory of the project, and I was building it pretty
easily with a Makefile, which just did the following:
CGO_ENABLED=1 GOOS=linux GOARCH=amd64 go build -o
target/dist/linux-amd64
I decided I wanted to move the go source files out of the root dir, so I
created a "src" directory, then moved "go.*" and my package subdirs to
"src". Getting this simple build to work was simple.
I also am constructing a multi-stage Dockerfile, which will be used in the
CI build. This is a little more complicated, and I'm getting an error on
the build command that I don't understand.
My Dockerfile looks something like this (... in some places):
------------------
FROM .../golang:1.17.6-bullseye as go-builder
ARG packages
ARG executable_name
ARG host_src_path
ARG cgo_enabled_01
ARG goos
ARG goarch
COPY $host_src_path .
RUN ls -lt
#RUN go mod download
RUN CGO_ENABLED=$cgo_enabled_01 GOOS=$goos GOARCH=$goarch go build
-o $executable_name $packages
FROM .../ubuntu-base:20.04
COPY ...
EXPOSE 8080
ENTRYPOINT ...
------------------
The Docker build looks something like this (... in some places):
-------------------------
docker build \
--build-arg host_src_path=src \
--build-arg packages=. \
--build-arg executable_name=... \
--build-arg cgo_enabled_01=1 \
--build-arg goos=linux \
--build-arg goarch=amd64 \
-f Dockerfile -t target/dist/linux/amd64/... .
---------------------
When I run this, I see the following:
------------------------
Step 10/17 : RUN CGO_ENABLED=$cgo_enabled_01 GOOS=$goos
GOARCH=$goarch go build -o $executable_name $packages
---> Running in 62ef0147061e
$GOPATH/go.mod exists but should not
The command '/bin/sh -c CGO_ENABLED=$cgo_enabled_01 GOOS=$goos
GOARCH=$goarch go build -o $executable_name $packages' returned a non-zero
code: 1
make: *** [Makefile:12: dockerbuild] Error 1
-----------------------
I googled that error message about go.mod, but I don't understand the
results, and I don't fully understand how to use GOPATH. I don't remember
doing anything with it before.
I'm sure I'm operating on some misconceptions, but I'm not sure what I'm
doing wrong.
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