Merge pull request #553 from tonistiigi/add-hosts

llbsolver: add support for extra host records

client/client_test.go

@@ -6,6 +6,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"io/ioutil"
+	"net"
 	"net/http"
 	"os"
 	"path/filepath"
@@ -59,9 +60,27 @@ func TestClientIntegration(t *testing.T) {
 		testDuplicateCacheMount,
 		testParallelLocalBuilds,
 		testSecretMounts,
+		testExtraHosts,
 	})
 }
 
+func testExtraHosts(t *testing.T, sb integration.Sandbox) {
+	t.Parallel()
+
+	c, err := New(context.TODO(), sb.Address())
+	require.NoError(t, err)
+	defer c.Close()
+
+	st := llb.Image("busybox:latest").
+		Run(llb.Shlex(`sh -c 'cat /etc/hosts | grep myhost | grep 1.2.3.4'`), llb.AddExtraHost("myhost", net.ParseIP("1.2.3.4")))
+
+	def, err := st.Marshal()
+	require.NoError(t, err)
+
+	_, err = c.Solve(context.TODO(), def, SolveOpt{}, nil)
+	require.NoError(t, err)
+}
+
 func testSecretMounts(t *testing.T, sb integration.Sandbox) {
 	t.Parallel()
 

client/llb/exec.go

@@ -2,6 +2,7 @@ package llb
 
 import (
 	_ "crypto/sha256"
+	"net"
 	"sort"
 
 	"github.com/moby/buildkit/solver/pb"
@@ -15,6 +16,7 @@ type Meta struct {
 	Cwd        string
 	User       string
 	ProxyEnv   *ProxyEnv
+	ExtraHosts []HostIP
 }
 
 func NewExecOp(root Output, meta Meta, readOnly bool, c Constraints) *ExecOp {
@@ -127,13 +129,22 @@ func (e *ExecOp) Marshal(c *Constraints) (digest.Digest, []byte, *pb.OpMetadata,
 		return e.mounts[i].target < e.mounts[j].target
 	})
 
-	peo := &pb.ExecOp{
+	meta := &pb.Meta{
-		Meta: &pb.Meta{
 		Args: e.meta.Args,
 		Env:  e.meta.Env.ToArray(),
 		Cwd:  e.meta.Cwd,
 		User: e.meta.User,
-		},
+	}
+	if len(e.meta.ExtraHosts) > 0 {
+		hosts := make([]*pb.HostIP, len(e.meta.ExtraHosts))
+		for i, h := range e.meta.ExtraHosts {
+			hosts[i] = &pb.HostIP{Host: h.Host, IP: h.IP.String()}
+		}
+		meta.ExtraHosts = hosts
+	}
+
+	peo := &pb.ExecOp{
+		Meta: meta,
 	}
 
 	if p := e.meta.ProxyEnv; p != nil {
@@ -386,6 +397,12 @@ func Dirf(str string, v ...interface{}) RunOption {
 	})
 }
 
+func AddExtraHost(host string, ip net.IP) RunOption {
+	return runOptionFunc(func(ei *ExecInfo) {
+		ei.State = ei.State.AddExtraHost(host, ip)
+	})
+}
+
 func Reset(s State) RunOption {
 	return runOptionFunc(func(ei *ExecInfo) {
 		ei.State = ei.State.Reset(s)

client/llb/meta.go

@@ -2,6 +2,7 @@ package llb
 
 import (
 	"fmt"
+	"net"
 	"path"
 
 	"github.com/containerd/containerd/platforms"
@@ -16,6 +17,7 @@ var (
 	keyDir       = contextKeyT("llb.exec.dir")
 	keyEnv       = contextKeyT("llb.exec.env")
 	keyUser      = contextKeyT("llb.exec.user")
+	keyExtraHost = contextKeyT("llb.exec.extrahost")
 	keyPlatform  = contextKeyT("llb.platform")
 )
 
@@ -124,6 +126,25 @@ func getPlatform(s State) *specs.Platform {
 	return nil
 }
 
+func extraHost(host string, ip net.IP) StateOption {
+	return func(s State) State {
+		return s.WithValue(keyExtraHost, append(getExtraHosts(s), HostIP{Host: host, IP: ip}))
+	}
+}
+
+func getExtraHosts(s State) []HostIP {
+	v := s.Value(keyExtraHost)
+	if v != nil {
+		return v.([]HostIP)
+	}
+	return nil
+}
+
+type HostIP struct {
+	Host string
+	IP   net.IP
+}
+
 type EnvList []KeyValue
 
 type KeyValue struct {

client/llb/state.go

@@ -3,6 +3,7 @@ package llb
 import (
 	"context"
 	"fmt"
+	"net"
 
 	"github.com/containerd/containerd/platforms"
 	"github.com/moby/buildkit/identity"
@@ -186,6 +187,7 @@ func (s State) Run(ro ...RunOption) ExecState {
 		Env:        getEnv(ei.State),
 		User:       getUser(ei.State),
 		ProxyEnv:   ei.ProxyEnv,
+		ExtraHosts: getExtraHosts(ei.State),
 	}
 
 	exec := NewExecOp(s.Output(), meta, ei.ReadonlyRootFS, ei.Constraints)
@@ -254,6 +256,10 @@ func (s State) With(so ...StateOption) State {
 	return s
 }
 
+func (s State) AddExtraHost(host string, ip net.IP) State {
+	return extraHost(host, ip)(s)
+}
+
 type output struct {
 	vertex   Vertex
 	getIndex func() (pb.OutputIndex, error)

executor/containerdexecutor/executor.go

@@ -39,10 +39,13 @@ func (w containerdExecutor) Exec(ctx context.Context, meta executor.Meta, root c
 		return err
 	}
 
-	hostsFile, err := oci.GetHostsFile(ctx, w.root)
+	hostsFile, clean, err := oci.GetHostsFile(ctx, w.root, meta.ExtraHosts)
 	if err != nil {
 		return err
 	}
+	if clean != nil {
+		defer clean()
+	}
 
 	mountable, err := root.Mount(ctx, false)
 	if err != nil {

executor/executor.go

@@ -3,6 +3,7 @@ package executor
 import (
 	"context"
 	"io"
+	"net"
 
 	"github.com/moby/buildkit/cache"
 )
@@ -15,6 +16,8 @@ type Meta struct {
 	Tty            bool
 	ReadonlyRootFS bool
 	// DisableNetworking bool
+
+	ExtraHosts []HostIP
 }
 
 type Mount struct {
@@ -28,3 +31,8 @@ type Executor interface {
 	// TODO: add stdout/err
 	Exec(ctx context.Context, meta Meta, rootfs cache.Mountable, mounts []Mount, stdin io.ReadCloser, stdout, stderr io.WriteCloser) error
 }
+
+type HostIP struct {
+	Host string
+	IP   net.IP
+}

executor/oci/hosts.go

@@ -1,10 +1,15 @@
 package oci
 
 import (
+	"bytes"
 	"context"
+	"fmt"
 	"io/ioutil"
 	"os"
 	"path/filepath"
+
+	"github.com/moby/buildkit/executor"
+	"github.com/moby/buildkit/identity"
 )
 
 const hostsContent = `
@@ -12,27 +17,53 @@ const hostsContent = `
 ::1	localhost ip6-localhost ip6-loopback
 `
 
-func GetHostsFile(ctx context.Context, stateDir string) (string, error) {
+func GetHostsFile(ctx context.Context, stateDir string, extraHosts []executor.HostIP) (string, func(), error) {
-	p := filepath.Join(stateDir, "hosts")
+	if len(extraHosts) == 0 {
 		_, err := g.Do(ctx, stateDir, func(ctx context.Context) (interface{}, error) {
+			_, _, err := makeHostsFile(stateDir, nil)
+			return nil, err
+		})
+		if err != nil {
+			return "", nil, err
+		}
+		return filepath.Join(stateDir, "hosts"), func() {}, nil
+	}
+	return makeHostsFile(stateDir, extraHosts)
+}
+
+func makeHostsFile(stateDir string, extraHosts []executor.HostIP) (string, func(), error) {
+	p := filepath.Join(stateDir, "hosts")
+	if len(extraHosts) != 0 {
+		p += "." + identity.NewID()
+	}
 	_, err := os.Stat(p)
 	if err == nil {
-			return "", nil
+		return "", func() {}, nil
 	}
 	if !os.IsNotExist(err) {
-			return "", err
+		return "", nil, err
 	}
-		if err := ioutil.WriteFile(p+".tmp", []byte(hostsContent), 0644); err != nil {
+
-			return "", err
+	b := &bytes.Buffer{}
+
+	if _, err := b.Write([]byte(hostsContent)); err != nil {
+		return "", nil, err
+	}
+
+	for _, h := range extraHosts {
+		if _, err := b.Write([]byte(fmt.Sprintf("%s\t%s\n", h.IP.String(), h.Host))); err != nil {
+			return "", nil, err
+		}
+	}
+
+	if err := ioutil.WriteFile(p+".tmp", b.Bytes(), 0644); err != nil {
+		return "", nil, err
 	}
 
 	if err := os.Rename(p+".tmp", p); err != nil {
-			return "", err
+		return "", nil, err
 	}
-		return "", nil
+	return p, func() {
-	})
+		os.RemoveAll(p)
-	if err != nil {
+	}, nil
-		return "", err
-	}
-	return p, nil
 }

executor/runcexecutor/executor.go

@@ -23,7 +23,7 @@ import (
 	"github.com/moby/buildkit/identity"
 	rootlessspecconv "github.com/moby/buildkit/util/rootless/specconv"
 	"github.com/moby/buildkit/util/system"
-	"github.com/opencontainers/runtime-spec/specs-go"
+	specs "github.com/opencontainers/runtime-spec/specs-go"
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
 )
@@ -103,10 +103,13 @@ func (w *runcExecutor) Exec(ctx context.Context, meta executor.Meta, root cache.
 		return err
 	}
 
-	hostsFile, err := oci.GetHostsFile(ctx, w.root)
+	hostsFile, clean, err := oci.GetHostsFile(ctx, w.root, meta.ExtraHosts)
 	if err != nil {
 		return err
 	}
+	if clean != nil {
+		defer clean()
+	}
 
 	mountable, err := root.Mount(ctx, false)
 	if err != nil {

frontend/dockerfile/builder/build.go

@@ -4,8 +4,10 @@ import (
 	"archive/tar"
 	"bytes"
 	"context"
+	"encoding/csv"
 	"encoding/json"
 	"fmt"
+	"net"
 	"regexp"
 	"strconv"
 	"strings"
@@ -36,6 +38,7 @@ const (
 	keyTargetPlatform     = "platform"
 	keyMultiPlatform      = "multi-platform"
 	keyImageResolveMode   = "image-resolve-mode"
+	keyGlobalAddHosts     = "add-hosts"
 )
 
 var httpPrefix = regexp.MustCompile("^https?://")
@@ -64,6 +67,11 @@ func Build(ctx context.Context, c client.Client) (*client.Result, error) {
 		return nil, err
 	}
 
+	extraHosts, err := parseExtraHosts(opts[keyGlobalAddHosts])
+	if err != nil {
+		return nil, errors.Wrap(err, "failed to parse additional hosts")
+	}
+
 	filename := opts[keyFilename]
 	if filename == "" {
 		filename = defaultDockerfileName
@@ -250,6 +258,7 @@ func Build(ctx context.Context, c client.Client) (*client.Result, error) {
 					BuildPlatforms:   buildPlatforms,
 					ImageResolveMode: resolveMode,
 					PrefixPlatform:   exportMap,
+					ExtraHosts:       extraHosts,
 				})
 
 				if err != nil {
@@ -413,3 +422,29 @@ func parseResolveMode(v string) (llb.ResolveMode, error) {
 		return 0, errors.Errorf("invalid image-resolve-mode: %s", v)
 	}
 }
+
+func parseExtraHosts(v string) ([]llb.HostIP, error) {
+	if v == "" {
+		return nil, nil
+	}
+	out := make([]llb.HostIP, 0)
+	csvReader := csv.NewReader(strings.NewReader(v))
+	fields, err := csvReader.Read()
+	if err != nil {
+		return nil, err
+	}
+	for _, field := range fields {
+		parts := strings.SplitN(field, "=", 2)
+		if len(parts) != 2 {
+			return nil, errors.Errorf("invalid key-value pair %s", field)
+		}
+		key := strings.ToLower(parts[0])
+		val := strings.ToLower(parts[1])
+		ip := net.ParseIP(val)
+		if ip == nil {
+			return nil, errors.Errorf("failed to parse IP %s", val)
+		}
+		out = append(out, llb.HostIP{Host: key, IP: ip})
+	}
+	return out, nil
+}

frontend/dockerfile/dockerfile2llb/convert.go

@@ -52,6 +52,7 @@ type ConvertOpt struct {
 	TargetPlatform   *specs.Platform
 	BuildPlatforms   []specs.Platform
 	PrefixPlatform   bool
+	ExtraHosts       []llb.HostIP
 }
 
 func Dockerfile2LLB(ctx context.Context, dt []byte, opt ConvertOpt) (*llb.State, *Image, error) {
@@ -294,6 +295,7 @@ func Dockerfile2LLB(ctx context.Context, dt []byte, opt ConvertOpt) (*llb.State,
 			cacheIDNamespace:  opt.CacheIDNamespace,
 			buildPlatforms:    platformOpt.buildPlatforms,
 			targetPlatform:    platformOpt.targetPlatform,
+			extraHosts:        opt.ExtraHosts,
 		}
 
 		if err = dispatchOnBuild(d, d.image.Config.OnBuild, opt); err != nil {
@@ -397,6 +399,7 @@ type dispatchOpt struct {
 	cacheIDNamespace  string
 	targetPlatform    specs.Platform
 	buildPlatforms    []specs.Platform
+	extraHosts        []llb.HostIP
 }
 
 func dispatch(d *dispatchState, cmd command, opt dispatchOpt) error {
@@ -584,6 +587,9 @@ func dispatchRun(d *dispatchState, c *instructions.RunCommand, proxy *llb.ProxyE
 	}
 	opt = append(opt, runMounts...)
 	opt = append(opt, llb.WithCustomName(prefixCommand(d, uppercaseCmd(processCmdEnv(dopt.shlex, c.String(), d.state.Run(opt...).Env())), d.prefixPlatform, d.state.GetPlatform())))
+	for _, h := range dopt.extraHosts {
+		opt = append(opt, llb.AddExtraHost(h.Host, h.IP))
+	}
 	d.state = d.state.Run(opt...).Root()
 	return commitToHistory(&d.image, "RUN "+runCommandString(args, d.buildArgs), true, &d.state)
 }

solver/llbsolver/ops/exec.go

@@ -6,6 +6,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"io/ioutil"
+	"net"
 	"os"
 	"path"
 	"path/filepath"
@@ -67,6 +68,11 @@ func NewExecOp(v solver.Vertex, op *pb.Op_Exec, cm cache.Manager, sm *session.Ma
 func cloneExecOp(old *pb.ExecOp) pb.ExecOp {
 	n := *old
 	meta := *n.Meta
+	meta.ExtraHosts = nil
+	for i := range n.Meta.ExtraHosts {
+		h := *n.Meta.ExtraHosts[i]
+		meta.ExtraHosts = append(meta.ExtraHosts, &h)
+	}
 	n.Meta = &meta
 	n.Mounts = nil
 	for i := range n.Mounts {
@@ -78,6 +84,11 @@ func cloneExecOp(old *pb.ExecOp) pb.ExecOp {
 
 func (e *execOp) CacheMap(ctx context.Context, index int) (*solver.CacheMap, bool, error) {
 	op := cloneExecOp(e.op)
+	for i := range op.Meta.ExtraHosts {
+		h := op.Meta.ExtraHosts[i]
+		h.IP = ""
+		op.Meta.ExtraHosts[i] = h
+	}
 	for i := range op.Mounts {
 		op.Mounts[i].Selector = ""
 	}
@@ -504,12 +515,18 @@ func (e *execOp) Exec(ctx context.Context, inputs []solver.Result) ([]solver.Res
 		return mounts[i].Dest < mounts[j].Dest
 	})
 
+	extraHosts, err := parseExtraHosts(e.op.Meta.ExtraHosts)
+	if err != nil {
+		return nil, err
+	}
+
 	meta := executor.Meta{
 		Args:           e.op.Meta.Args,
 		Env:            e.op.Meta.Env,
 		Cwd:            e.op.Meta.Cwd,
 		User:           e.op.Meta.User,
 		ReadonlyRootFS: readonlyRootFS,
+		ExtraHosts:     extraHosts,
 	}
 
 	if e.op.Meta.ProxyEnv != nil {
@@ -657,3 +674,18 @@ func (r *cacheRef) Release(ctx context.Context) error {
 	}
 	return nil
 }
+
+func parseExtraHosts(ips []*pb.HostIP) ([]executor.HostIP, error) {
+	out := make([]executor.HostIP, len(ips))
+	for i, hip := range ips {
+		ip := net.ParseIP(hip.IP)
+		if ip == nil {
+			return nil, errors.Errorf("failed to parse IP %s", hip.IP)
+		}
+		out[i] = executor.HostIP{
+			IP:   ip,
+			Host: hip.Host,
+		}
+	}
+	return out, nil
+}

solver/pb/ops.pb.go

@@ -29,6 +29,7 @@
 		ProxyEnv
 		WorkerConstraints
 		Definition
+		HostIP
 */
 package pb
 
@@ -419,6 +420,7 @@ type Meta struct {
 	Cwd        string    `protobuf:"bytes,3,opt,name=cwd,proto3" json:"cwd,omitempty"`
 	User       string    `protobuf:"bytes,4,opt,name=user,proto3" json:"user,omitempty"`
 	ProxyEnv   *ProxyEnv `protobuf:"bytes,5,opt,name=proxy_env,json=proxyEnv" json:"proxy_env,omitempty"`
+	ExtraHosts []*HostIP `protobuf:"bytes,6,rep,name=extraHosts" json:"extraHosts,omitempty"`
 }
 
 func (m *Meta) Reset()                    { *m = Meta{} }
@@ -461,6 +463,13 @@ func (m *Meta) GetProxyEnv() *ProxyEnv {
 	return nil
 }
 
+func (m *Meta) GetExtraHosts() []*HostIP {
+	if m != nil {
+		return m.ExtraHosts
+	}
+	return nil
+}
+
 // Mount specifies how to mount an input Op as a filesystem.
 type Mount struct {
 	Input     InputIndex  `protobuf:"varint,1,opt,name=input,proto3,customtype=InputIndex" json:"input"`
@@ -864,6 +873,30 @@ func (m *Definition) GetMetadata() map[github_com_opencontainers_go_digest.Diges
 	return nil
 }
 
+type HostIP struct {
+	Host string `protobuf:"bytes,1,opt,name=Host,proto3" json:"Host,omitempty"`
+	IP   string `protobuf:"bytes,2,opt,name=IP,proto3" json:"IP,omitempty"`
+}
+
+func (m *HostIP) Reset()                    { *m = HostIP{} }
+func (m *HostIP) String() string            { return proto.CompactTextString(m) }
+func (*HostIP) ProtoMessage()               {}
+func (*HostIP) Descriptor() ([]byte, []int) { return fileDescriptorOps, []int{18} }
+
+func (m *HostIP) GetHost() string {
+	if m != nil {
+		return m.Host
+	}
+	return ""
+}
+
+func (m *HostIP) GetIP() string {
+	if m != nil {
+		return m.IP
+	}
+	return ""
+}
+
 func init() {
 	proto.RegisterType((*Op)(nil), "pb.Op")
 	proto.RegisterType((*Platform)(nil), "pb.Platform")
@@ -883,6 +916,7 @@ func init() {
 	proto.RegisterType((*ProxyEnv)(nil), "pb.ProxyEnv")
 	proto.RegisterType((*WorkerConstraints)(nil), "pb.WorkerConstraints")
 	proto.RegisterType((*Definition)(nil), "pb.Definition")
+	proto.RegisterType((*HostIP)(nil), "pb.HostIP")
 	proto.RegisterEnum("pb.MountType", MountType_name, MountType_value)
 	proto.RegisterEnum("pb.CacheSharingOpt", CacheSharingOpt_name, CacheSharingOpt_value)
 }
@@ -1192,6 +1226,18 @@ func (m *Meta) MarshalTo(dAtA []byte) (int, error) {
 		}
 		i += n9
 	}
+	if len(m.ExtraHosts) > 0 {
+		for _, msg := range m.ExtraHosts {
+			dAtA[i] = 0x32
+			i++
+			i = encodeVarintOps(dAtA, i, uint64(msg.Size()))
+			n, err := msg.MarshalTo(dAtA[i:])
+			if err != nil {
+				return 0, err
+			}
+			i += n
+		}
+	}
 	return i, nil
 }
 
@@ -1790,6 +1836,36 @@ func (m *Definition) MarshalTo(dAtA []byte) (int, error) {
 	return i, nil
 }
 
+func (m *HostIP) Marshal() (dAtA []byte, err error) {
+	size := m.Size()
+	dAtA = make([]byte, size)
+	n, err := m.MarshalTo(dAtA)
+	if err != nil {
+		return nil, err
+	}
+	return dAtA[:n], nil
+}
+
+func (m *HostIP) MarshalTo(dAtA []byte) (int, error) {
+	var i int
+	_ = i
+	var l int
+	_ = l
+	if len(m.Host) > 0 {
+		dAtA[i] = 0xa
+		i++
+		i = encodeVarintOps(dAtA, i, uint64(len(m.Host)))
+		i += copy(dAtA[i:], m.Host)
+	}
+	if len(m.IP) > 0 {
+		dAtA[i] = 0x12
+		i++
+		i = encodeVarintOps(dAtA, i, uint64(len(m.IP)))
+		i += copy(dAtA[i:], m.IP)
+	}
+	return i, nil
+}
+
 func encodeVarintOps(dAtA []byte, offset int, v uint64) int {
 	for v >= 1<<7 {
 		dAtA[offset] = uint8(v&0x7f | 0x80)
@@ -1942,6 +2018,12 @@ func (m *Meta) Size() (n int) {
 		l = m.ProxyEnv.Size()
 		n += 1 + l + sovOps(uint64(l))
 	}
+	if len(m.ExtraHosts) > 0 {
+		for _, e := range m.ExtraHosts {
+			l = e.Size()
+			n += 1 + l + sovOps(uint64(l))
+		}
+	}
 	return n
 }
 
@@ -2197,6 +2279,20 @@ func (m *Definition) Size() (n int) {
 	return n
 }
 
+func (m *HostIP) Size() (n int) {
+	var l int
+	_ = l
+	l = len(m.Host)
+	if l > 0 {
+		n += 1 + l + sovOps(uint64(l))
+	}
+	l = len(m.IP)
+	if l > 0 {
+		n += 1 + l + sovOps(uint64(l))
+	}
+	return n
+}
+
 func sovOps(x uint64) (n int) {
 	for {
 		n++
@@ -3070,6 +3166,37 @@ func (m *Meta) Unmarshal(dAtA []byte) error {
 				return err
 			}
 			iNdEx = postIndex
+		case 6:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field ExtraHosts", wireType)
+			}
+			var msglen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowOps
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				msglen |= (int(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if msglen < 0 {
+				return ErrInvalidLengthOps
+			}
+			postIndex := iNdEx + msglen
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.ExtraHosts = append(m.ExtraHosts, &HostIP{})
+			if err := m.ExtraHosts[len(m.ExtraHosts)-1].Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
+				return err
+			}
+			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
 			skippy, err := skipOps(dAtA[iNdEx:])
@@ -5260,6 +5387,114 @@ func (m *Definition) Unmarshal(dAtA []byte) error {
 	}
 	return nil
 }
+func (m *HostIP) Unmarshal(dAtA []byte) error {
+	l := len(dAtA)
+	iNdEx := 0
+	for iNdEx < l {
+		preIndex := iNdEx
+		var wire uint64
+		for shift := uint(0); ; shift += 7 {
+			if shift >= 64 {
+				return ErrIntOverflowOps
+			}
+			if iNdEx >= l {
+				return io.ErrUnexpectedEOF
+			}
+			b := dAtA[iNdEx]
+			iNdEx++
+			wire |= (uint64(b) & 0x7F) << shift
+			if b < 0x80 {
+				break
+			}
+		}
+		fieldNum := int32(wire >> 3)
+		wireType := int(wire & 0x7)
+		if wireType == 4 {
+			return fmt.Errorf("proto: HostIP: wiretype end group for non-group")
+		}
+		if fieldNum <= 0 {
+			return fmt.Errorf("proto: HostIP: illegal tag %d (wire type %d)", fieldNum, wire)
+		}
+		switch fieldNum {
+		case 1:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Host", wireType)
+			}
+			var stringLen uint64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowOps
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				stringLen |= (uint64(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			intStringLen := int(stringLen)
+			if intStringLen < 0 {
+				return ErrInvalidLengthOps
+			}
+			postIndex := iNdEx + intStringLen
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.Host = string(dAtA[iNdEx:postIndex])
+			iNdEx = postIndex
+		case 2:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field IP", wireType)
+			}
+			var stringLen uint64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowOps
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				stringLen |= (uint64(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			intStringLen := int(stringLen)
+			if intStringLen < 0 {
+				return ErrInvalidLengthOps
+			}
+			postIndex := iNdEx + intStringLen
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.IP = string(dAtA[iNdEx:postIndex])
+			iNdEx = postIndex
+		default:
+			iNdEx = preIndex
+			skippy, err := skipOps(dAtA[iNdEx:])
+			if err != nil {
+				return err
+			}
+			if skippy < 0 {
+				return ErrInvalidLengthOps
+			}
+			if (iNdEx + skippy) > l {
+				return io.ErrUnexpectedEOF
+			}
+			iNdEx += skippy
+		}
+	}
+
+	if iNdEx > l {
+		return io.ErrUnexpectedEOF
+	}
+	return nil
+}
 func skipOps(dAtA []byte) (n int, err error) {
 	l := len(dAtA)
 	iNdEx := 0
@@ -5368,88 +5603,91 @@ var (
 func init() { proto.RegisterFile("ops.proto", fileDescriptorOps) }
 
 var fileDescriptorOps = []byte{
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+	// 1371 bytes of a gzipped FileDescriptorProto
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+	0x00, 0xff, 0xff, 0x5f, 0x7b, 0x2c, 0xa4, 0xfb, 0x0b, 0x00, 0x00,
 }

solver/pb/ops.proto

@@ -52,6 +52,7 @@ message Meta {
 	string cwd = 3;
 	string user = 4;
 	ProxyEnv proxy_env = 5;
+	repeated HostIP extraHosts = 6;
 }
 
 // Mount specifies how to mount an input Op as a filesystem.
@@ -181,3 +182,8 @@ message Definition {
 	// A key must be an LLB op digest string. Currently, empty string is not expected as a key, but it may change in the future.
 	map<string, OpMetadata> metadata = 2 [(gogoproto.castkey) = "github.com/opencontainers/go-digest.Digest", (gogoproto.nullable) = false];
 }
+
+message HostIP {
+	string Host = 1;
+	string IP = 2;
+}