Getting error on "go build"

[Vyacheslav1557]

Description

I'm trying to build an example of using libcontainer. My host machine is windows. I am aware that this library only works under Linux, therefore I've tried building it with GOOS=linux and docker, getting the same error.

Steps to reproduce the issue

package main

import "github.com/opencontainers/runc/libcontainer/specconv"

func main() {
	_ = specconv.Example()
}

Docker image to reproduce:

FROM golang:1.23.2-alpine AS base
WORKDIR /src
COPY . .
RUN go mod download && go build -o /bin/lab5
ENTRYPOINT [ "/bin/lab5" ]

Describe the results you received and expected

The error:

8.494 # github.com/opencontainers/runc/libcontainer/specconv
8.494 /go/pkg/mod/github.com/opencontainers/runc@v1.2.0/libcontainer/specconv/spec_linux.go:1015:33: undefined: userns.GetUserNamespaceMappings
8.494 /go/pkg/mod/github.com/opencontainers/runc@v1.2.0/libcontainer/specconv/spec_linux.go:1031:15: undefined: userns.IsSameMapping
8.494 /go/pkg/mod/github.com/opencontainers/runc@v1.2.0/libcontainer/specconv/spec_linux.go:1032:13: undefined: userns.IsSameMapping

What version of runc are you using?

1.2.0

Host OS information

NAME="Alpine Linux"
ID=alpine
VERSION_ID=3.20.3
PRETTY_NAME="Alpine Linux v3.20"
HOME_URL="https://alpinelinux.org/"
BUG_REPORT_URL="https://gitlab.alpinelinux.org/alpine/aports/-/issues"

Host kernel information

Linux fbaad18f958f 5.15.133.1-microsoft-standard-WSL2 #1 SMP Thu Oct 5 21:02:42 UTC 2023 x86_64 Linux

[Vyacheslav1557]

Installed linux. Still get the error :(

[kolyshkin]

It looks like golang:1.23.2-alpine image lacks a C compiler which is needed for the libcontainer/internal/userns package to be built.

If you change your Dockerfile to begin with

FROM golang:1.23.2 AS base

it should work.

Now, you might have the same issue locally (the solution is to install gcc).

[Vyacheslav1557]

CGO_ENABLED=1 also helped

[kolyshkin]

CGO_ENABLED=1 also helped

This is generally not necessary, and won't help if a C compiler is not installed.

With a Dockerfile based on yours above, adding CGO_ENABLED=1 resulted in

STEP 4/7: RUN go mod download
--> bb63ba4605ed
STEP 5/7: ENV CGO_ENABLED=1
--> 4d2c7c48b7e4
STEP 6/7: RUN go build -o /bin/lab5
# runtime/cgo
cgo: C compiler "gcc" not found: exec: "gcc": executable file not found in $PATH
Error: building at STEP "RUN go build -o /bin/lab5": while running runtime: exit status 1

but at least it makes it clear what is missing.