I had earlier written a note about troubles refactoring my project to have a "src" directory, but I've backed off on that for now. I see that the main problem I saw with that hasn't changed when backing out those changes. It appears that running this build inside a docker image seems to be somehow causing this problem.
In any case, I have a relatively simple go application with main.go, go.mod, and go.sum in the root directory, with subdirectories containing other source files in packages. When I just run "go build ..." from the command line in the root directory of my project, it works fine and produces a working executable. However, I'm trying to get this build to work within a published go "builder" image, which I will use as the first stage in a multi-stage Docker build. I will first state that this has something to do with GOPATH, and I've gone through https://www.digitalocean.com/community/tutorials/understanding-the-gopath , but I'd have to say that I still don't understand its proper role here. Not sure what you would want to see first, but here's a plain "ls" of the root directory of my project: ------------------------- ./ Dockerfile go.mod Jenkinsfile README.md ../ .dockerignore go.sum lib/ target/ app/ .git/ handlers/ main.go trustStore/ config/ .gitignore include/ Makefile funcs/ ----------------------- Just running "make build" does this: --------------------- CGO_ENABLED=1 GOOS=linux GOARCH=amd64 go build -o ../target/dist/linux-amd64 --------------------- Which is fine. My "dockerbuild" target in the Makefile is this: -------------------- dockerbuild: docker build \ --build-arg host_src_path=. \ --build-arg packages=. \ --build-arg executable_name=appgo \ --build-arg cgo_enabled_01=1 \ --build-arg goos=linux \ --build-arg goarch=amd64 \ -f Dockerfile -t appgo . ----------------------- My Dockerfile, before the start of the second build stage, is this: ---------------------------- 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 env RUN ls -lt RUN ls -lt $GOPATH #RUN go mod download RUN CGO_ENABLED=$cgo_enabled_01 GOOS=$goos GOARCH=$goarch go build -o $executable_name $packages -------------------- When I run "make dockerbuild", I see this: ------------------ Sending build context to Docker daemon 125.8MB Step 1/19 : FROM .../golang:1.17.6-bullseye as go-builder ---> 80d9a75ccb38 Step 2/19 : ARG packages ---> Using cache ---> d98015e225b1 Step 3/19 : ARG executable_name ---> Using cache ---> 1d336ac5cf1b Step 4/19 : ARG host_src_path ---> Using cache ---> 59595b09a376 Step 5/19 : ARG cgo_enabled_01 ---> Using cache ---> 3c4c08392ede Step 6/19 : ARG goos ---> Using cache ---> 6ed0d6881fb4 Step 7/19 : ARG goarch ---> Using cache ---> 9e4b94e86b09 Step 8/19 : COPY $host_src_path . ---> 4727e2fc3e80 Step 9/19 : RUN env ---> Running in 8fcedaa86227 HOSTNAME=8fcedaa86227 HOME=/root packages=. cgo_enabled_01=1 goarch=amd64 host_src_path=. PATH=/go/bin:/usr/local/go/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin goos=linux GOPATH=/go executable_name=appgo PWD=/go GOLANG_VERSION=1.17.6 Removing intermediate container 8fcedaa86227 ---> 46e44a5a3539 Step 10/19 : RUN ls -lt ---> Running in 75107286d337 total 128 -rw-rw-r-- 1 root root 635 Feb 11 18:37 Dockerfile -rw-rw-r-- 1 root root 737 Feb 11 18:29 Makefile -rw-rw-r-- 1 root root 131 Feb 10 18:59 Jenkinsfile drwxrwxrwx 2 root root 4096 Jan 27 10:09 bin drwxrwxrwx 2 root root 4096 Jan 27 10:09 src -rw-rw-r-- 1 root root 967 Jan 13 18:34 main.go drwxrwxr-x 3 root root 4096 Jan 11 23:46 target drwxrwxr-x 2 root root 4096 Jan 11 23:46 funcs drwxrwxr-x 3 root root 4096 Jan 11 21:06 trustStore -rw-rw-r-- 1 root root 1454 Jan 11 21:06 README.md drwxrwxr-x 2 root root 4096 Jan 11 21:06 app drwxrwxr-x 2 root root 4096 Jan 11 21:06 config -rw-rw-r-- 1 root root 806 Jan 11 21:06 go.mod -rw-rw-r-- 1 root root 65194 Jan 11 21:06 go.sum drwxrwxr-x 2 root root 4096 Jan 11 21:06 handlers drwxrwxr-x 3 root root 4096 Jan 11 21:06 include drwxrwxr-x 4 root root 4096 Jan 11 21:06 lib Removing intermediate container 75107286d337 ---> a880f28ef2b2 Step 11/19 : RUN ls -lt $GOPATH ---> Running in 220d4e8dbb33 total 128 -rw-rw-r-- 1 root root 635 Feb 11 18:37 Dockerfile -rw-rw-r-- 1 root root 737 Feb 11 18:29 Makefile -rw-rw-r-- 1 root root 131 Feb 10 18:59 Jenkinsfile drwxrwxrwx 2 root root 4096 Jan 27 10:09 bin drwxrwxrwx 2 root root 4096 Jan 27 10:09 src -rw-rw-r-- 1 root root 967 Jan 13 18:34 main.go drwxrwxr-x 3 root root 4096 Jan 11 23:46 target drwxrwxr-x 2 root root 4096 Jan 11 23:46 funcs drwxrwxr-x 3 root root 4096 Jan 11 21:06 trustStore -rw-rw-r-- 1 root root 1454 Jan 11 21:06 README.md drwxrwxr-x 2 root root 4096 Jan 11 21:06 app drwxrwxr-x 2 root root 4096 Jan 11 21:06 config -rw-rw-r-- 1 root root 806 Jan 11 21:06 go.mod -rw-rw-r-- 1 root root 65194 Jan 11 21:06 go.sum drwxrwxr-x 2 root root 4096 Jan 11 21:06 handlers drwxrwxr-x 3 root root 4096 Jan 11 21:06 include drwxrwxr-x 4 root root 4096 Jan 11 21:06 lib Removing intermediate container 220d4e8dbb33 ---> 76c8e73bc8e8 Step 12/19 : RUN CGO_ENABLED=$cgo_enabled_01 GOOS=$goos GOARCH=$goarch go build -o $executable_name $packages ---> Running in 28a92ca3224d $GOPATH/go.mod exists but should not The command '/bin/sh -c CGO_ENABLED=$cgo_enabled_01 GOOS=$goos GOARCH=$goarch go build -o $executable_name $packages' returned a non-zero code: 1 make: *** [Makefile:11: dockerbuild] Error 1 -------------------- There are a few things to note here, starting with the error message at the end: ------------------ $GOPATH/go.mod exists but should not ------------------ Outside of my Docker container, $GOPATH is basically ~/go, and it just contains directories "bin" and "pkg". However, inside the container, $GOPATH has all the code for my project, including the "go.mod" file, so at least the first part of that error message is accurate, but I don't understand the significance of that, or what I'm supposed to do to resolve this. -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/golang-nuts/7354bade-2c03-42b8-9fb1-530023ff5499n%40googlegroups.com.
