Files
Aleksa Sarai 96ce8b63bc vendor: revendor github.com/opencontainers/image-tools@da84dc9dddc823a32f543e60323f841d12429c51
This requires re-vendoring a bunch of other things (as well as the old
Sirupsen/logrus path), the relevant commits being:

* github.com/xeipuuv/gojsonschema@0c8571ac0ce161a5feb57375a9cdf148c98c0f70
* github.com/xeipuuv/gojsonpointer@6fe8760cad3569743d51ddbb243b26f8456742dc
* github.com/xeipuuv/gojsonreference@e02fc20de94c78484cd5ffb007f8af96be030a45
* go4.org@034d17a462f7b2dcd1a4a73553ec5357ff6e6c6e

Signed-off-by: Aleksa Sarai <asarai@suse.de>
2017-08-15 02:08:12 +10:00

127 lines
3.2 KiB
Go

// Copyright 2016 The Linux Foundation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package image
import (
"bytes"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"os"
"path/filepath"
"strconv"
"strings"
"github.com/opencontainers/image-spec/schema"
"github.com/opencontainers/image-spec/specs-go/v1"
"github.com/opencontainers/runtime-spec/specs-go"
"github.com/pkg/errors"
)
type config v1.Image
func findConfig(w walker, d *v1.Descriptor) (*config, error) {
var c config
cpath := filepath.Join("blobs", string(d.Digest.Algorithm()), d.Digest.Hex())
switch err := w.walk(func(path string, info os.FileInfo, r io.Reader) error {
if info.IsDir() || filepath.Clean(path) != cpath {
return nil
}
buf, err := ioutil.ReadAll(r)
if err != nil {
return errors.Wrapf(err, "%s: error reading config", path)
}
if err := schema.ValidatorMediaTypeImageConfig.Validate(bytes.NewReader(buf)); err != nil {
return errors.Wrapf(err, "%s: config validation failed", path)
}
if err := json.Unmarshal(buf, &c); err != nil {
return err
}
return errEOW
}); err {
case nil:
return nil, fmt.Errorf("%s: config not found", cpath)
case errEOW:
return &c, nil
default:
return nil, err
}
}
func (c *config) runtimeSpec(rootfs string) (*specs.Spec, error) {
if c.OS != "linux" {
return nil, fmt.Errorf("%s: unsupported OS", c.OS)
}
var s specs.Spec
s.Version = specs.Version
// we should at least apply the default spec, otherwise this is totally useless
s.Root = &specs.Root{}
s.Root.Path = rootfs
s.Process = &specs.Process{}
s.Process.Terminal = true
s.Process.Cwd = "/"
if c.Config.WorkingDir != "" {
s.Process.Cwd = c.Config.WorkingDir
}
s.Process.Env = append(s.Process.Env, c.Config.Env...)
s.Process.Args = append(s.Process.Args, c.Config.Entrypoint...)
s.Process.Args = append(s.Process.Args, c.Config.Cmd...)
if len(s.Process.Args) == 0 {
s.Process.Args = append(s.Process.Args, "sh")
}
if uid, err := strconv.Atoi(c.Config.User); err == nil {
s.Process.User.UID = uint32(uid)
} else if ug := strings.Split(c.Config.User, ":"); len(ug) == 2 {
uid, err := strconv.Atoi(ug[0])
if err != nil {
return nil, errors.New("config.User: unsupported uid format")
}
gid, err := strconv.Atoi(ug[1])
if err != nil {
return nil, errors.New("config.User: unsupported gid format")
}
s.Process.User.UID = uint32(uid)
s.Process.User.GID = uint32(gid)
} else if c.Config.User != "" {
return nil, errors.New("config.User: unsupported format")
}
s.Linux = &specs.Linux{}
for vol := range c.Config.Volumes {
s.Mounts = append(
s.Mounts,
specs.Mount{
Destination: vol,
Type: "bind",
Options: []string{"rbind"},
},
)
}
return &s, nil
}