ee04cfa3f9
Fix issues with sync.Pool being passed an array and not a pointer. See https://github.com/dominikh/go-tools/blob/master/cmd/staticcheck/docs/checks/SA6002 Add missing tests for content.Copy Fix T.Fatal being called in a goroutine Signed-off-by: Daniel Nephin <dnephin@gmail.com>
94 lines
2.2 KiB
Go
94 lines
2.2 KiB
Go
package rootfs
|
|
|
|
import (
|
|
"context"
|
|
"fmt"
|
|
"io/ioutil"
|
|
"os"
|
|
|
|
"github.com/containerd/containerd/log"
|
|
"github.com/containerd/containerd/mount"
|
|
"github.com/containerd/containerd/snapshot"
|
|
digest "github.com/opencontainers/go-digest"
|
|
"github.com/pkg/errors"
|
|
)
|
|
|
|
var (
|
|
initializers = map[string]initializerFunc{}
|
|
)
|
|
|
|
type initializerFunc func(string) error
|
|
|
|
// Mounter handles mount and unmount
|
|
type Mounter interface {
|
|
Mount(target string, mounts ...mount.Mount) error
|
|
Unmount(target string) error
|
|
}
|
|
|
|
// InitRootFS initializes the snapshot for use as a rootfs
|
|
func InitRootFS(ctx context.Context, name string, parent digest.Digest, readonly bool, snapshotter snapshot.Snapshotter, mounter Mounter) ([]mount.Mount, error) {
|
|
_, err := snapshotter.Stat(ctx, name)
|
|
if err == nil {
|
|
return nil, errors.Errorf("rootfs already exists")
|
|
}
|
|
// TODO: ensure not exist error once added to snapshot package
|
|
|
|
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 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: ensure not exist error once added to snapshot package
|
|
|
|
// 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
|
|
}
|
|
|
|
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
|
|
}
|