121 lines
2.9 KiB
Go
121 lines
2.9 KiB
Go
/*
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Copyright The containerd Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package v2
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import (
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"context"
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"io/ioutil"
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"os"
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"path/filepath"
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"github.com/containerd/containerd/identifiers"
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"github.com/containerd/containerd/namespaces"
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"github.com/pkg/errors"
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)
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const configFilename = "config.json"
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// LoadBundle loads an existing bundle from disk
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func LoadBundle(ctx context.Context, root, id string) (*Bundle, error) {
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ns, err := namespaces.NamespaceRequired(ctx)
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if err != nil {
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return nil, err
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}
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return &Bundle{
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ID: id,
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Path: filepath.Join(root, ns, id),
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Namespace: ns,
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}, nil
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}
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// NewBundle returns a new bundle on disk
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func NewBundle(ctx context.Context, root, state, id string, spec []byte) (b *Bundle, err error) {
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if err := identifiers.Validate(id); err != nil {
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return nil, errors.Wrapf(err, "invalid task id %s", id)
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}
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ns, err := namespaces.NamespaceRequired(ctx)
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if err != nil {
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return nil, err
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}
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work := filepath.Join(root, ns, id)
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b = &Bundle{
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ID: id,
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Path: filepath.Join(state, ns, id),
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Namespace: ns,
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}
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paths := []string{b.Path, work}
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// create base directories
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for _, d := range paths {
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if err := os.MkdirAll(filepath.Dir(d), 0711); err != nil {
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return nil, err
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}
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if err := os.Mkdir(d, 0711); err != nil {
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return nil, err
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}
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}
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defer func() {
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if err != nil {
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for _, d := range paths {
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os.RemoveAll(d)
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}
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}
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}()
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// create rootfs dir
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if err := os.Mkdir(filepath.Join(b.Path, "rootfs"), 0711); err != nil {
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return nil, err
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}
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// symlink workdir
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if err := os.Symlink(work, filepath.Join(b.Path, "work")); err != nil {
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return nil, err
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}
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// write the spec to the bundle
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err = ioutil.WriteFile(filepath.Join(b.Path, configFilename), spec, 0666)
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return b, err
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}
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// Bundle represents an OCI bundle
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type Bundle struct {
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// ID of the bundle
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ID string
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// Path to the bundle
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Path string
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// Namespace of the bundle
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Namespace string
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}
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// Delete a bundle atomically
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func (b *Bundle) Delete() error {
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work, werr := os.Readlink(filepath.Join(b.Path, "work"))
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err := os.RemoveAll(b.Path)
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if err == nil {
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if werr == nil {
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return os.RemoveAll(work)
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}
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return nil
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}
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// error removing the bundle path; still attempt removing work dir
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var err2 error
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if werr == nil {
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err2 = os.RemoveAll(work)
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if err2 == nil {
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return err
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}
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}
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return errors.Wrapf(err, "failed to remove both bundle and workdir locations: %v", err2)
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}
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