Statically link devmapper when using CGO - go

Question

I'm building a go 1.20 program that use podman bindings (v4), one of its dependencies require CGO.
Dynamically build & LD
Dynamically building the project works on alpine linux (golang:1.20-alpine), ld returns the following:
/lib/ld-musl-x86_64.so.1 (0x7f741c064000)
libgpgme.so.11 => /usr/lib/libgpgme.so.11 (0x7f741c01f000)
libdevmapper.so.1.02 => /lib/libdevmapper.so.1.02 (0x7f741bfd4000)
libc.musl-x86_64.so.1 => /lib/ld-musl-x86_64.so.1 (0x7f741c064000)
libassuan.so.0 => /usr/lib/libassuan.so.0 (0x7f741bfc1000)
libgpg-error.so.0 => /usr/lib/libgpg-error.so.0 (0x7f741bfa0000)
The command I used is CGO_ENABLED=1 go build -o myprog ./cmd/cli/main.go
Trying statically build
But when I try to statically build (for use in a scratch container) with go build -ldflags '-linkmode external -w -extldflags "-static"' -o myprog ./cmd/cli/main.go I have this error:
/app # go build -ldflags '-linkmode external -w -extldflags "-static" ' -o myprog ./cmd/cli/main.go
# command-line-arguments
/usr/local/go/pkg/tool/linux_amd64/link: running gcc failed: exit status 1
/usr/lib/gcc/x86_64-alpine-linux-musl/12.2.1/../../../../x86_64-alpine-linux-musl/bin/ld: cannot find -ldevmapper: No such file or directory
collect2: error: ld returned 1 exit status
Dependencies installation
But It's installed along with other dependencies previously in the container:
RUN apk add --no-cache make gcc musl-dev lvm2-dev gpgme-dev btrfs-progs-dev
What I've tried
I tried building from the ubuntu-based tag for go (golang:1.20), but same it can't find devmapper.
Explicitly setting to CGO_ENABLED to 0 or 1 don't change anything when trying to build statically.
I passed -v to go build to know how it's linking, here is the result:
/app # CC=gcc go build -ldflags '-linkmode external -w -extldflags "-static" -v' -o myprog ./cmd/cli/main.go
# command-line-arguments
HEADER = -H5 -T0x401000 -R0x1000
host link: "gcc" "-m64" "-o" "/tmp/go-build2898353667/b001/exe/a.out" "-static" "-Wl,--compress-debug-sections=zlib" "/tmp/go-link-3857943538/go.o" "/tmp/go-link-3857943538/000000.o" [...] "/tmp/go-link-3857943538/000053.o" "-O2" "-g" "-lresolv" "-O2" "-g" "-O2" "-g" "-lpthread" "-O2" "-g" "-O2" "-g" "-O2" "-g" "-ldl" "-O2" "-g" "-O2" "-g" "-lgpgme" "-O2" "-g" "-O2" "-g" "-L/lib" "-ldevmapper" "-O2" "-g" "-O2" "-g" "-O2" "-g" "-no-pie" "-static"
/usr/local/go/pkg/tool/linux_amd64/link: running gcc failed: exit status 1
/usr/lib/gcc/x86_64-alpine-linux-musl/12.2.1/../../../../x86_64-alpine-linux-musl/bin/ld: cannot find -ldevmapper: No such file or directory
collect2: error: ld returned 1 exit status
libdevmapper is in several location, including in /lib (as seen in the linker) at /lib/libdevmapper.so.1.02
Reproduce
main.go:
package main
import (
"context"
"fmt"
"os"
"github.com/containers/podman/v2/pkg/bindings"
"github.com/containers/podman/v2/pkg/bindings/images"
)
func main() {
// Get Podman socket location
sock_dir := os.Getenv("XDG_RUNTIME_DIR")
socket := "unix:" + sock_dir + "/podman/podman.sock"
// Connect to Podman socket
ctx, err := bindings.NewConnection(context.Background(), socket)
if err != nil {
panic(err)
}
// list images
imgs, err := images.List(ctx, nil, nil)
if err != nil {
panic(err)
}
for _, img := range imgs {
fmt.Printf("Names: %#v\n", img.Names)
}
}
Containerfile (or Dockerfile):
FROM --platform=linux/amd64 docker.io/library/golang:1.20-alpine AS builder
RUN apk add --no-cache make gcc musl-dev lvm2-dev gpgme-dev btrfs-progs-dev
WORKDIR /app
COPY go.mod go.sum ./
RUN go mod download
COPY . .
# Dont work
RUN go build -ldflags '-linkmode external -w -extldflags "-static" ' -o myprog ./main.go
# this works, but dynamically linked
# RUN go build -o myprog ./main.go
Then run:
go init sof-75459376
go mod tidy
# fail
podman build -t sof/75459376:latest .