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exec: use qemu emulator automatically
Signed-off-by: Tonis Tiigi <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,114 @@ | ||
| package ops | ||
|
|
||
| import ( | ||
| "context" | ||
| "io/ioutil" | ||
| "os" | ||
| "os/exec" | ||
| "path/filepath" | ||
|
|
||
| "github.com/containerd/containerd/mount" | ||
| "github.com/containerd/containerd/platforms" | ||
| "github.com/docker/docker/pkg/idtools" | ||
| "github.com/moby/buildkit/snapshot" | ||
| "github.com/moby/buildkit/solver/pb" | ||
| "github.com/moby/buildkit/util/binfmt_misc" | ||
| specs "github.com/opencontainers/image-spec/specs-go/v1" | ||
| "github.com/pkg/errors" | ||
| copy "github.com/tonistiigi/fsutil/copy" | ||
| ) | ||
|
|
||
| const qemuMountName = "/dev/.buildkit_qemu_emulator" | ||
|
|
||
| var qemuArchMap = map[string]string{ | ||
| "arm64": "aarch64", | ||
| "amd64": "x86_64", | ||
| "riscv64": "riscv64", | ||
| "arm": "arm", | ||
| "s390x": "s390x", | ||
| "ppc64le": "ppc64le", | ||
| } | ||
|
|
||
| type emulator struct { | ||
| path string | ||
| idmap *idtools.IdentityMapping | ||
| } | ||
|
|
||
| func (e *emulator) Mount(ctx context.Context, readonly bool) (snapshot.Mountable, error) { | ||
| return &staticEmulatorMount{path: e.path, idmap: e.idmap}, nil | ||
| } | ||
|
|
||
| type staticEmulatorMount struct { | ||
| path string | ||
| idmap *idtools.IdentityMapping | ||
| } | ||
|
|
||
| func (m *staticEmulatorMount) Mount() ([]mount.Mount, func() error, error) { | ||
| tmpdir, err := ioutil.TempDir("", "buildkit-qemu-emulator") | ||
| if err != nil { | ||
| return nil, nil, err | ||
| } | ||
| var ret bool | ||
| defer func() { | ||
| if !ret { | ||
| os.RemoveAll(tmpdir) | ||
| } | ||
| }() | ||
|
|
||
| var uid, gid int | ||
| if m.idmap != nil { | ||
| root := m.idmap.RootPair() | ||
| uid = root.UID | ||
| gid = root.GID | ||
| } | ||
| if err := copy.Copy(context.TODO(), filepath.Dir(m.path), filepath.Base(m.path), tmpdir, qemuMountName, func(ci *copy.CopyInfo) { | ||
| m := 0555 | ||
| ci.Mode = &m | ||
| }, copy.WithChown(uid, gid)); err != nil { | ||
| return nil, nil, err | ||
| } | ||
|
|
||
| ret = true | ||
| return []mount.Mount{{ | ||
| Type: "bind", | ||
| Source: filepath.Join(tmpdir, qemuMountName), | ||
| Options: []string{"ro", "bind"}, | ||
| }}, func() error { | ||
| return os.RemoveAll(tmpdir) | ||
| }, nil | ||
|
|
||
| } | ||
| func (m *staticEmulatorMount) IdentityMapping() *idtools.IdentityMapping { | ||
| return m.idmap | ||
| } | ||
|
|
||
| func getEmulator(p *pb.Platform, idmap *idtools.IdentityMapping) (*emulator, error) { | ||
| all := binfmt_misc.SupportedPlatforms(false) | ||
| m := make(map[string]struct{}, len(all)) | ||
|
|
||
| for _, p := range all { | ||
| m[p] = struct{}{} | ||
| } | ||
|
|
||
| pp := platforms.Normalize(specs.Platform{ | ||
| Architecture: p.Architecture, | ||
| OS: p.OS, | ||
| Variant: p.Variant, | ||
| }) | ||
|
|
||
| if _, ok := m[platforms.Format(pp)]; ok { | ||
| return nil, nil | ||
| } | ||
|
|
||
| a, ok := qemuArchMap[pp.Architecture] | ||
| if !ok { | ||
| a = pp.Architecture | ||
| } | ||
|
|
||
| fn, err := exec.LookPath("buildkit-qemu-" + a) | ||
| if err != nil { | ||
| return nil, errors.Errorf("no emulator available for %v", pp.OS) | ||
| } | ||
|
|
||
| return &emulator{path: fn}, nil | ||
| } |
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