Add init and get mounts to rootfs service

Update rootfs package to add mount initializer function.

Signed-off-by: Derek McGowan <derek@mcgstyle.net> (github: dmcgowan)
This commit is contained in:
Derek McGowan 2017-03-09 18:11:26 -08:00
parent 38a6f90f2b
commit 5d4577534a
No known key found for this signature in database
GPG Key ID: F58C5D0A4405ACDB
6 changed files with 847 additions and 46 deletions

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@ -11,6 +11,9 @@
It has these top-level messages:
PrepareRequest
PrepareResponse
InitMountsRequest
MountsRequest
MountResponse
*/
package rootfs
@ -18,8 +21,7 @@ import proto "github.com/gogo/protobuf/proto"
import fmt "fmt"
import math "math"
import _ "github.com/gogo/protobuf/gogoproto"
import _ "github.com/golang/protobuf/ptypes/empty"
import _ "github.com/docker/containerd/api/types/mount"
import containerd_v1_types "github.com/docker/containerd/api/types/mount"
import containerd_v1_types1 "github.com/docker/containerd/api/types/descriptor"
import github_com_opencontainers_go_digest "github.com/opencontainers/go-digest"
@ -61,9 +63,38 @@ func (m *PrepareResponse) Reset() { *m = PrepareResponse{} }
func (*PrepareResponse) ProtoMessage() {}
func (*PrepareResponse) Descriptor() ([]byte, []int) { return fileDescriptorRootfs, []int{1} }
type InitMountsRequest struct {
Name string `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
ChainID github_com_opencontainers_go_digest.Digest `protobuf:"bytes,2,opt,name=chainID,proto3,customtype=github.com/opencontainers/go-digest.Digest" json:"chainID"`
Readonly bool `protobuf:"varint,3,opt,name=Readonly,proto3" json:"Readonly,omitempty"`
}
func (m *InitMountsRequest) Reset() { *m = InitMountsRequest{} }
func (*InitMountsRequest) ProtoMessage() {}
func (*InitMountsRequest) Descriptor() ([]byte, []int) { return fileDescriptorRootfs, []int{2} }
type MountsRequest struct {
Name string `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
}
func (m *MountsRequest) Reset() { *m = MountsRequest{} }
func (*MountsRequest) ProtoMessage() {}
func (*MountsRequest) Descriptor() ([]byte, []int) { return fileDescriptorRootfs, []int{3} }
type MountResponse struct {
Mounts []*containerd_v1_types.Mount `protobuf:"bytes,1,rep,name=mounts" json:"mounts,omitempty"`
}
func (m *MountResponse) Reset() { *m = MountResponse{} }
func (*MountResponse) ProtoMessage() {}
func (*MountResponse) Descriptor() ([]byte, []int) { return fileDescriptorRootfs, []int{4} }
func init() {
proto.RegisterType((*PrepareRequest)(nil), "containerd.v1.PrepareRequest")
proto.RegisterType((*PrepareResponse)(nil), "containerd.v1.PrepareResponse")
proto.RegisterType((*InitMountsRequest)(nil), "containerd.v1.InitMountsRequest")
proto.RegisterType((*MountsRequest)(nil), "containerd.v1.MountsRequest")
proto.RegisterType((*MountResponse)(nil), "containerd.v1.MountResponse")
}
// Reference imports to suppress errors if they are not otherwise used.
@ -78,6 +109,8 @@ const _ = grpc.SupportPackageIsVersion4
type RootFSClient interface {
Prepare(ctx context.Context, in *PrepareRequest, opts ...grpc.CallOption) (*PrepareResponse, error)
InitMounts(ctx context.Context, in *InitMountsRequest, opts ...grpc.CallOption) (*MountResponse, error)
Mounts(ctx context.Context, in *MountsRequest, opts ...grpc.CallOption) (*MountResponse, error)
}
type rootFSClient struct {
@ -97,10 +130,30 @@ func (c *rootFSClient) Prepare(ctx context.Context, in *PrepareRequest, opts ...
return out, nil
}
func (c *rootFSClient) InitMounts(ctx context.Context, in *InitMountsRequest, opts ...grpc.CallOption) (*MountResponse, error) {
out := new(MountResponse)
err := grpc.Invoke(ctx, "/containerd.v1.RootFS/InitMounts", in, out, c.cc, opts...)
if err != nil {
return nil, err
}
return out, nil
}
func (c *rootFSClient) Mounts(ctx context.Context, in *MountsRequest, opts ...grpc.CallOption) (*MountResponse, error) {
out := new(MountResponse)
err := grpc.Invoke(ctx, "/containerd.v1.RootFS/Mounts", in, out, c.cc, opts...)
if err != nil {
return nil, err
}
return out, nil
}
// Server API for RootFS service
type RootFSServer interface {
Prepare(context.Context, *PrepareRequest) (*PrepareResponse, error)
InitMounts(context.Context, *InitMountsRequest) (*MountResponse, error)
Mounts(context.Context, *MountsRequest) (*MountResponse, error)
}
func RegisterRootFSServer(s *grpc.Server, srv RootFSServer) {
@ -125,6 +178,42 @@ func _RootFS_Prepare_Handler(srv interface{}, ctx context.Context, dec func(inte
return interceptor(ctx, in, info, handler)
}
func _RootFS_InitMounts_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
in := new(InitMountsRequest)
if err := dec(in); err != nil {
return nil, err
}
if interceptor == nil {
return srv.(RootFSServer).InitMounts(ctx, in)
}
info := &grpc.UnaryServerInfo{
Server: srv,
FullMethod: "/containerd.v1.RootFS/InitMounts",
}
handler := func(ctx context.Context, req interface{}) (interface{}, error) {
return srv.(RootFSServer).InitMounts(ctx, req.(*InitMountsRequest))
}
return interceptor(ctx, in, info, handler)
}
func _RootFS_Mounts_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
in := new(MountsRequest)
if err := dec(in); err != nil {
return nil, err
}
if interceptor == nil {
return srv.(RootFSServer).Mounts(ctx, in)
}
info := &grpc.UnaryServerInfo{
Server: srv,
FullMethod: "/containerd.v1.RootFS/Mounts",
}
handler := func(ctx context.Context, req interface{}) (interface{}, error) {
return srv.(RootFSServer).Mounts(ctx, req.(*MountsRequest))
}
return interceptor(ctx, in, info, handler)
}
var _RootFS_serviceDesc = grpc.ServiceDesc{
ServiceName: "containerd.v1.RootFS",
HandlerType: (*RootFSServer)(nil),
@ -133,6 +222,14 @@ var _RootFS_serviceDesc = grpc.ServiceDesc{
MethodName: "Prepare",
Handler: _RootFS_Prepare_Handler,
},
{
MethodName: "InitMounts",
Handler: _RootFS_InitMounts_Handler,
},
{
MethodName: "Mounts",
Handler: _RootFS_Mounts_Handler,
},
},
Streams: []grpc.StreamDesc{},
Metadata: "github.com/docker/containerd/api/services/rootfs/rootfs.proto",
@ -192,6 +289,100 @@ func (m *PrepareResponse) MarshalTo(dAtA []byte) (int, error) {
return i, nil
}
func (m *InitMountsRequest) 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 *InitMountsRequest) MarshalTo(dAtA []byte) (int, error) {
var i int
_ = i
var l int
_ = l
if len(m.Name) > 0 {
dAtA[i] = 0xa
i++
i = encodeVarintRootfs(dAtA, i, uint64(len(m.Name)))
i += copy(dAtA[i:], m.Name)
}
if len(m.ChainID) > 0 {
dAtA[i] = 0x12
i++
i = encodeVarintRootfs(dAtA, i, uint64(len(m.ChainID)))
i += copy(dAtA[i:], m.ChainID)
}
if m.Readonly {
dAtA[i] = 0x18
i++
if m.Readonly {
dAtA[i] = 1
} else {
dAtA[i] = 0
}
i++
}
return i, nil
}
func (m *MountsRequest) 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 *MountsRequest) MarshalTo(dAtA []byte) (int, error) {
var i int
_ = i
var l int
_ = l
if len(m.Name) > 0 {
dAtA[i] = 0xa
i++
i = encodeVarintRootfs(dAtA, i, uint64(len(m.Name)))
i += copy(dAtA[i:], m.Name)
}
return i, nil
}
func (m *MountResponse) 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 *MountResponse) MarshalTo(dAtA []byte) (int, error) {
var i int
_ = i
var l int
_ = l
if len(m.Mounts) > 0 {
for _, msg := range m.Mounts {
dAtA[i] = 0xa
i++
i = encodeVarintRootfs(dAtA, i, uint64(msg.Size()))
n, err := msg.MarshalTo(dAtA[i:])
if err != nil {
return 0, err
}
i += n
}
}
return i, nil
}
func encodeFixed64Rootfs(dAtA []byte, offset int, v uint64) int {
dAtA[offset] = uint8(v)
dAtA[offset+1] = uint8(v >> 8)
@ -241,6 +432,45 @@ func (m *PrepareResponse) Size() (n int) {
return n
}
func (m *InitMountsRequest) Size() (n int) {
var l int
_ = l
l = len(m.Name)
if l > 0 {
n += 1 + l + sovRootfs(uint64(l))
}
l = len(m.ChainID)
if l > 0 {
n += 1 + l + sovRootfs(uint64(l))
}
if m.Readonly {
n += 2
}
return n
}
func (m *MountsRequest) Size() (n int) {
var l int
_ = l
l = len(m.Name)
if l > 0 {
n += 1 + l + sovRootfs(uint64(l))
}
return n
}
func (m *MountResponse) Size() (n int) {
var l int
_ = l
if len(m.Mounts) > 0 {
for _, e := range m.Mounts {
l = e.Size()
n += 1 + l + sovRootfs(uint64(l))
}
}
return n
}
func sovRootfs(x uint64) (n int) {
for {
n++
@ -274,6 +504,38 @@ func (this *PrepareResponse) String() string {
}, "")
return s
}
func (this *InitMountsRequest) String() string {
if this == nil {
return "nil"
}
s := strings.Join([]string{`&InitMountsRequest{`,
`Name:` + fmt.Sprintf("%v", this.Name) + `,`,
`ChainID:` + fmt.Sprintf("%v", this.ChainID) + `,`,
`Readonly:` + fmt.Sprintf("%v", this.Readonly) + `,`,
`}`,
}, "")
return s
}
func (this *MountsRequest) String() string {
if this == nil {
return "nil"
}
s := strings.Join([]string{`&MountsRequest{`,
`Name:` + fmt.Sprintf("%v", this.Name) + `,`,
`}`,
}, "")
return s
}
func (this *MountResponse) String() string {
if this == nil {
return "nil"
}
s := strings.Join([]string{`&MountResponse{`,
`Mounts:` + strings.Replace(fmt.Sprintf("%v", this.Mounts), "Mount", "containerd_v1_types.Mount", 1) + `,`,
`}`,
}, "")
return s
}
func valueToStringRootfs(v interface{}) string {
rv := reflect.ValueOf(v)
if rv.IsNil() {
@ -442,6 +704,294 @@ func (m *PrepareResponse) Unmarshal(dAtA []byte) error {
}
return nil
}
func (m *InitMountsRequest) 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 ErrIntOverflowRootfs
}
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: InitMountsRequest: wiretype end group for non-group")
}
if fieldNum <= 0 {
return fmt.Errorf("proto: InitMountsRequest: illegal tag %d (wire type %d)", fieldNum, wire)
}
switch fieldNum {
case 1:
if wireType != 2 {
return fmt.Errorf("proto: wrong wireType = %d for field Name", wireType)
}
var stringLen uint64
for shift := uint(0); ; shift += 7 {
if shift >= 64 {
return ErrIntOverflowRootfs
}
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 ErrInvalidLengthRootfs
}
postIndex := iNdEx + intStringLen
if postIndex > l {
return io.ErrUnexpectedEOF
}
m.Name = string(dAtA[iNdEx:postIndex])
iNdEx = postIndex
case 2:
if wireType != 2 {
return fmt.Errorf("proto: wrong wireType = %d for field ChainID", wireType)
}
var stringLen uint64
for shift := uint(0); ; shift += 7 {
if shift >= 64 {
return ErrIntOverflowRootfs
}
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 ErrInvalidLengthRootfs
}
postIndex := iNdEx + intStringLen
if postIndex > l {
return io.ErrUnexpectedEOF
}
m.ChainID = github_com_opencontainers_go_digest.Digest(dAtA[iNdEx:postIndex])
iNdEx = postIndex
case 3:
if wireType != 0 {
return fmt.Errorf("proto: wrong wireType = %d for field Readonly", wireType)
}
var v int
for shift := uint(0); ; shift += 7 {
if shift >= 64 {
return ErrIntOverflowRootfs
}
if iNdEx >= l {
return io.ErrUnexpectedEOF
}
b := dAtA[iNdEx]
iNdEx++
v |= (int(b) & 0x7F) << shift
if b < 0x80 {
break
}
}
m.Readonly = bool(v != 0)
default:
iNdEx = preIndex
skippy, err := skipRootfs(dAtA[iNdEx:])
if err != nil {
return err
}
if skippy < 0 {
return ErrInvalidLengthRootfs
}
if (iNdEx + skippy) > l {
return io.ErrUnexpectedEOF
}
iNdEx += skippy
}
}
if iNdEx > l {
return io.ErrUnexpectedEOF
}
return nil
}
func (m *MountsRequest) 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 ErrIntOverflowRootfs
}
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: MountsRequest: wiretype end group for non-group")
}
if fieldNum <= 0 {
return fmt.Errorf("proto: MountsRequest: illegal tag %d (wire type %d)", fieldNum, wire)
}
switch fieldNum {
case 1:
if wireType != 2 {
return fmt.Errorf("proto: wrong wireType = %d for field Name", wireType)
}
var stringLen uint64
for shift := uint(0); ; shift += 7 {
if shift >= 64 {
return ErrIntOverflowRootfs
}
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 ErrInvalidLengthRootfs
}
postIndex := iNdEx + intStringLen
if postIndex > l {
return io.ErrUnexpectedEOF
}
m.Name = string(dAtA[iNdEx:postIndex])
iNdEx = postIndex
default:
iNdEx = preIndex
skippy, err := skipRootfs(dAtA[iNdEx:])
if err != nil {
return err
}
if skippy < 0 {
return ErrInvalidLengthRootfs
}
if (iNdEx + skippy) > l {
return io.ErrUnexpectedEOF
}
iNdEx += skippy
}
}
if iNdEx > l {
return io.ErrUnexpectedEOF
}
return nil
}
func (m *MountResponse) 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 ErrIntOverflowRootfs
}
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: MountResponse: wiretype end group for non-group")
}
if fieldNum <= 0 {
return fmt.Errorf("proto: MountResponse: illegal tag %d (wire type %d)", fieldNum, wire)
}
switch fieldNum {
case 1:
if wireType != 2 {
return fmt.Errorf("proto: wrong wireType = %d for field Mounts", wireType)
}
var msglen int
for shift := uint(0); ; shift += 7 {
if shift >= 64 {
return ErrIntOverflowRootfs
}
if iNdEx >= l {
return io.ErrUnexpectedEOF
}
b := dAtA[iNdEx]
iNdEx++
msglen |= (int(b) & 0x7F) << shift
if b < 0x80 {
break
}
}
if msglen < 0 {
return ErrInvalidLengthRootfs
}
postIndex := iNdEx + msglen
if postIndex > l {
return io.ErrUnexpectedEOF
}
m.Mounts = append(m.Mounts, &containerd_v1_types.Mount{})
if err := m.Mounts[len(m.Mounts)-1].Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
return err
}
iNdEx = postIndex
default:
iNdEx = preIndex
skippy, err := skipRootfs(dAtA[iNdEx:])
if err != nil {
return err
}
if skippy < 0 {
return ErrInvalidLengthRootfs
}
if (iNdEx + skippy) > l {
return io.ErrUnexpectedEOF
}
iNdEx += skippy
}
}
if iNdEx > l {
return io.ErrUnexpectedEOF
}
return nil
}
func skipRootfs(dAtA []byte) (n int, err error) {
l := len(dAtA)
iNdEx := 0
@ -552,26 +1102,32 @@ func init() {
}
var fileDescriptorRootfs = []byte{
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0x00, 0x00, 0xff, 0xff, 0xca, 0x73, 0x7a, 0x14, 0xad, 0x03, 0x00, 0x00,
}

View File

@ -3,16 +3,13 @@ syntax = "proto3";
package containerd.v1;
import "gogoproto/gogo.proto";
import "google/protobuf/empty.proto";
import "github.com/docker/containerd/api/types/mount/mount.proto";
import "github.com/docker/containerd/api/types/descriptor/descriptor.proto";
service RootFS {
rpc Prepare(PrepareRequest) returns (PrepareResponse);
// TODO: Add method for initializing and retrieving mounts
//rpc InitMounts(InitRequest) returns (MountResponse);
//rpc Mounts(MountRequest) returns (MountResponse);
rpc InitMounts(InitMountsRequest) returns (MountResponse);
rpc Mounts(MountsRequest) returns (MountResponse);
}
message PrepareRequest {
@ -23,16 +20,16 @@ message PrepareResponse {
string chainid = 1 [(gogoproto.customtype) = "github.com/opencontainers/go-digest.Digest", (gogoproto.nullable) = false, (gogoproto.customname) = "ChainID"];
}
//message InitRequest {
// string name = 1;
// string chainID = 2;
// bool Readonly = 3;
//}
//
//message MountRequest {
// string name = 1;
//}
//
//message MountResponse {
// repeated containerd.v1.types.Mount mounts = 1;
//}
message InitMountsRequest {
string name = 1;
string chainID = 2 [(gogoproto.customtype) = "github.com/opencontainers/go-digest.Digest", (gogoproto.nullable) = false, (gogoproto.customname) = "ChainID"];
bool Readonly = 3;
}
message MountsRequest {
string name = 1;
}
message MountResponse {
repeated containerd.v1.types.Mount mounts = 1;
}

98
rootfs/init.go Normal file
View File

@ -0,0 +1,98 @@
package rootfs
import (
"context"
"fmt"
"io/ioutil"
"os"
"github.com/docker/containerd"
"github.com/docker/containerd/log"
"github.com/docker/containerd/snapshot"
digest "github.com/opencontainers/go-digest"
"github.com/pkg/errors"
)
var (
initializers = map[string]initializerFunc{}
)
type initializerFunc func(string) error
func InitRootFS(ctx context.Context, name string, parent digest.Digest, readonly bool, snapshotter snapshot.Snapshotter, mounter Mounter) ([]containerd.Mount, error) {
_, err := snapshotter.Stat(ctx, name)
if err == nil {
return nil, errors.Errorf("rootfs already exists")
}
// TODO: check if should return error
parentS := parent.String()
initName := defaultInitializer
initFn := initializers[initName]
if initFn != nil {
parentS, err = createInitLayer(ctx, parentS, initName, initFn, snapshotter, mounter)
if err != nil {
return nil, err
}
}
if readonly {
return snapshotter.View(ctx, name, parentS)
}
return snapshotter.Prepare(ctx, name, parentS)
}
func GetRootFS(ctx context.Context, name string, snapshotter snapshot.Snapshotter) ([]containerd.Mount, error) {
return snapshotter.Mounts(ctx, name)
}
func createInitLayer(ctx context.Context, parent, initName string, initFn func(string) error, snapshotter snapshot.Snapshotter, mounter Mounter) (string, error) {
initS := fmt.Sprintf("%s %s", parent, initName)
if _, err := snapshotter.Stat(ctx, initS); err == nil {
return initS, nil
}
// TODO: check if should return error
// Create tempdir
td, err := ioutil.TempDir("", "create-init-")
if err != nil {
return "", err
}
defer os.RemoveAll(td)
mounts, err := snapshotter.Prepare(ctx, td, parent)
if err != nil {
return "", err
}
defer func() {
if err != nil {
// TODO: once implemented uncomment
//if rerr := snapshotter.Remove(ctx, td); rerr != nil {
// log.G(ctx).Errorf("Failed to remove snapshot %s: %v", td, merr)
//}
}
}()
if err = mounter.Mount(td, mounts...); err != nil {
return "", err
}
if err = initFn(td); err != nil {
if merr := mounter.Unmount(td); merr != nil {
log.G(ctx).Errorf("Failed to unmount %s: %v", td, merr)
}
return "", err
}
if err = mounter.Unmount(td); err != nil {
return "", err
}
if err := snapshotter.Commit(ctx, initS, td); err != nil {
return "", err
}
return initS, nil
}

114
rootfs/init_linux.go Normal file
View File

@ -0,0 +1,114 @@
package rootfs
import (
"os"
"path/filepath"
"syscall"
)
const (
defaultInitializer = "linux-init"
)
func init() {
initializers[defaultInitializer] = initFS
}
func createDirectory(name string, uid, gid int) initializerFunc {
return func(root string) error {
dname := filepath.Join(root, name)
st, err := os.Stat(dname)
if err != nil && !os.IsNotExist(err) {
return err
} else if err == nil {
if st.IsDir() {
stat := st.Sys().(*syscall.Stat_t)
if int(stat.Gid) == gid && int(stat.Uid) == uid {
return nil
}
} else {
if err := os.Remove(dname); err != nil {
return err
}
if err := os.Mkdir(dname, 0755); err != nil {
return err
}
}
} else {
if err := os.Mkdir(dname, 0755); err != nil {
return err
}
}
return os.Chown(dname, uid, gid)
}
}
func touchFile(name string, uid, gid int) initializerFunc {
return func(root string) error {
fname := filepath.Join(root, name)
st, err := os.Stat(fname)
if err != nil && !os.IsNotExist(err) {
return err
} else if err == nil {
stat := st.Sys().(*syscall.Stat_t)
if int(stat.Gid) == gid && int(stat.Uid) == uid {
return nil
}
return os.Chown(fname, uid, gid)
}
f, err := os.OpenFile(fname, os.O_CREATE, 0644)
if err != nil {
return err
}
defer f.Close()
return f.Chown(uid, gid)
}
}
func symlink(oldname, newname string) initializerFunc {
return func(root string) error {
linkName := filepath.Join(root, newname)
if _, err := os.Stat(linkName); err != nil && !os.IsNotExist(err) {
return err
} else if err == nil {
return nil
}
return os.Symlink(oldname, linkName)
}
}
func initFS(root string) error {
st, err := os.Stat(root)
if err != nil {
return err
}
stat := st.Sys().(*syscall.Stat_t)
uid := int(stat.Uid)
gid := int(stat.Gid)
initFuncs := []initializerFunc{
createDirectory("/dev", uid, gid),
createDirectory("/dev/pts", uid, gid),
createDirectory("/dev/shm", uid, gid),
touchFile("/dev/console", uid, gid),
createDirectory("/proc", uid, gid),
createDirectory("/sys", uid, gid),
createDirectory("/etc", uid, gid),
touchFile("/etc/resolv.conf", uid, gid),
touchFile("/etc/hosts", uid, gid),
touchFile("/etc/hostname", uid, gid),
symlink("/proc/mounts", "/etc/mtab"),
}
for _, fn := range initFuncs {
if err := fn(root); err != nil {
return err
}
}
return nil
}

7
rootfs/init_other.go Normal file
View File

@ -0,0 +1,7 @@
// +build !linux
package rootfs
const (
defaultInitializer = ""
)

View File

@ -5,6 +5,7 @@ import (
"github.com/docker/containerd"
rootfsapi "github.com/docker/containerd/api/services/rootfs"
containerd_v1_types "github.com/docker/containerd/api/types/mount"
"github.com/docker/containerd/content"
"github.com/docker/containerd/log"
"github.com/docker/containerd/plugin"
@ -63,6 +64,38 @@ func (s *Service) Prepare(ctx context.Context, pr *rootfsapi.PrepareRequest) (*r
}, nil
}
func (s *Service) InitMounts(ctx context.Context, ir *rootfsapi.InitMountsRequest) (*rootfsapi.MountResponse, error) {
mounts, err := rootfs.InitRootFS(ctx, ir.Name, ir.ChainID, ir.Readonly, s.snapshotter, mounter{})
if err != nil {
return nil, err
}
return &rootfsapi.MountResponse{
Mounts: apiMounts(mounts),
}, nil
}
func (s *Service) Mounts(ctx context.Context, mr *rootfsapi.MountsRequest) (*rootfsapi.MountResponse, error) {
mounts, err := rootfs.GetRootFS(ctx, mr.Name, s.snapshotter)
if err != nil {
return nil, err
}
return &rootfsapi.MountResponse{
Mounts: apiMounts(mounts),
}, nil
}
func apiMounts(mounts []containerd.Mount) []*containerd_v1_types.Mount {
am := make([]*containerd_v1_types.Mount, len(mounts))
for i, m := range mounts {
am[i] = &containerd_v1_types.Mount{
Type: m.Type,
Source: m.Source,
Options: m.Options,
}
}
return am
}
type mounter struct{}
func (mounter) Mount(dir string, mounts ...containerd.Mount) error {
@ -80,7 +113,3 @@ func emptyResolver(digest.Digest) digest.Digest {
func noopRegister(digest.Digest, digest.Digest) error {
return nil
}
//func (s *Service) Mounts(ctx context.Context, mr *rootfsapi.MountRequest) (*rootfsapi.MountResponse, error) {
//
//}