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buildkit.go
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buildkit.go
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// Copyright 2022 Namespace Labs Inc; All rights reserved.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
package golang
import (
"context"
"fmt"
"strings"
"github.com/moby/buildkit/client/llb"
"github.com/moby/buildkit/util/system"
specs "github.com/opencontainers/image-spec/specs-go/v1"
"namespacelabs.dev/foundation/internal/artifacts/oci"
"namespacelabs.dev/foundation/internal/build"
"namespacelabs.dev/foundation/internal/build/buildkit"
"namespacelabs.dev/foundation/internal/compute"
"namespacelabs.dev/foundation/internal/console"
"namespacelabs.dev/foundation/internal/dependencies/pins"
"namespacelabs.dev/foundation/internal/fnerrors"
"namespacelabs.dev/foundation/internal/git"
"namespacelabs.dev/foundation/internal/llbutil"
"namespacelabs.dev/foundation/internal/production"
"namespacelabs.dev/foundation/std/cfg"
)
var (
useSeparateGoModPhase = false
)
func buildUsingBuildkit(ctx context.Context, env cfg.Context, bin GoBinary, conf build.Configuration) (compute.Computable[oci.Image], error) {
local := buildkit.LocalContents{
Module: conf.Workspace(),
Path: bin.GoModulePath,
}
src := buildkit.MakeLocalState(local)
if conf.TargetPlatform() == nil {
return nil, fnerrors.InternalError("go: target platform is missing")
}
base := makeGoBuildBase(ctx, bin.GoVersion, *conf.TargetPlatform())
var prodBase llb.State
if !bin.BinaryOnly {
var err error
prodBase, err = production.ServerImageLLB(production.Distroless, *conf.TargetPlatform())
if err != nil {
return nil, err
}
} else {
prodBase = llb.Scratch()
}
label := "building"
if bin.PackageName != "" {
label += fmt.Sprintf(" %s", bin.PackageName)
}
goBuild := goBuildArgs(bin.GoVersion)
goBuild = append(goBuild, fmt.Sprintf("-o=/out/%s", bin.BinaryName))
relPath, err := makePkg(bin.GoModulePath, bin.SourcePath)
if err != nil {
return nil, err
}
goBuild = append(goBuild, relPath)
state := (llbutil.RunGo{
Base: prepareGoMod(base, src, conf.TargetPlatform()).Root(),
SrcMount: src,
WorkingDir: ".",
Platform: conf.TargetPlatform(),
}).With(
llbutil.PrefixSh(label, conf.TargetPlatform(), "go "+strings.Join(goBuild, " "))...).
AddMount("/out", prodBase)
return buildkit.BuildImage(ctx, buildkit.DeferClient(env.Configuration(), conf.TargetPlatform()), conf, state, local)
}
func prepareGoMod(base, src llb.State, platform *specs.Platform) llb.ExecState {
r := llbutil.RunGo{
Base: base,
SrcMount: src,
WorkingDir: ".",
Platform: platform,
}
ro := llbutil.PrefixSh("updating deps", platform, "go mod download -x")
if git.AssumeSSHAuth {
ro = append(ro, llb.AddSSHSocket(llb.SSHID(buildkit.SSHAgentProviderID), llb.SSHSocketTarget("/root/ssh-agent.sock")))
ro = append(ro, llb.AddEnv("SSH_AUTH_SOCK", "/root/ssh-agent.sock"))
}
if !useSeparateGoModPhase {
return r.With(ro...)
}
return r.PrepareGoMod(ro...)
}
func makeGoImage(version string) string {
return fmt.Sprintf("docker.io/library/golang:%s-alpine", version)
}
func goAlpine(ctx context.Context, version string, platform specs.Platform) llb.State {
img := makeGoImage(version)
if r, err := pins.CheckImage(img); err == nil {
return llbutil.Image(r, platform)
}
fmt.Fprintf(console.Warnings(ctx), "go: no pinned version of %q\n", img)
return llbutil.Image(img, platform)
}
func makeGoBuildBase(ctx context.Context, version string, platform specs.Platform) llb.State {
st := goAlpine(ctx, version, platform).
AddEnv("CGO_ENABLED", "0").
AddEnv("PATH", "/usr/local/go/bin:"+system.DefaultPathEnvUnix).
AddEnv("GOPATH", "/go").
Run(llb.Shlex("apk add --no-cache git openssh"),
llb.WithCustomName("[prepare build image] apk add --no-cache git openssh")).Root()
for _, ent := range git.NoPromptEnv() {
st = st.AddEnv(ent[0], ent[1])
}
// Don't block builds on checking the pubkey of the target ssh host.
// XXX security
st = st.AddEnv("GIT_SSH_COMMAND", "ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no")
if llbutil.GitCredentialsBuildkitSecret != "" {
st = st.Run(llb.Shlex("git config --global credential.helper store")).Root()
}
return st
}