no buildable Go source files

[CWSpear]

Disclaimer: I'm not normally a Go developer, so some of my terms may not be quite right.

I'm trying to build a Docker plugin that use the go-plugins-helpers from Docker and I wanted the binary to run in Docker alpine, but alpine doesn't have the linked dynamic binaries or whatever, so I was reading up that I need to set CGO_ENABLED=0 when building. I've tried a few different build commands, including:

CGO_ENABLED=0 go build -a -installsuffix cgo -ldflags '-s' -o bin/linux/amd64/local-persist -v
CGO_ENABLED=0 go build -a -tags netgo -a -o bin/linux/amd64/local-persist -v

(Tried that last one with and without CGO_ENABLED flag. No error, but still won't run in alpine.)

I keep getting this error:

../github.com/docker/go-plugins-helpers/sdk/unix_listener.go:12:2: no buildable Go source files in /go/src/github.com/coreos/go-systemd/util
make: *** [binary-linux-amd64] Error 1

Steps to reproduce yourself:

git clone https://github.com/CWSpear/local-persist
cd local-persist
docker run -it -v `pwd`:/go/src/app  golang:onbuild bash
# now you'll be inside the docker container, next run:
export CGO_ENABLED=0
go get -v -d
go build [whatever flags] .

See docker/go-plugins-helpers#50

[lucab]

github.com/coreos/go-systemd/util needs cgo, but CGO_ENABLED=0 disables cgo. I guess that's why the build is failing.

My suggestion is that you remove the CGO_ENABLED=0 when building, and bring libsystemd.so into the image hosting your plugin. However, I'm not sure I've fully understood why you need to run systemd-related code in alpine (which is one of the few distros no supporting it)

[CWSpear]

I don't know why I need systemd-related code either. The plugin is a Docker Volume plugin, and one of the options is to run it as a container. I wanted the container to be small, since it's just doing one thing, so that's why I thought of alpine. It appears that it's needed by unix_listener.go, so something in there needs it to run this plugin.

How can I "bring libsystemd.so into the image," or what are alternatives to get something like my plugin's binary running in a minimal image.