buildkit/cmd/buildkitd/main_oci_worker.go

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// +build linux,!no_oci_worker
package main
import (
"os/exec"
ctdsnapshot "github.com/containerd/containerd/snapshots"
"github.com/containerd/containerd/snapshots/native"
"github.com/containerd/containerd/snapshots/overlay"
"github.com/moby/buildkit/worker"
"github.com/moby/buildkit/worker/base"
"github.com/moby/buildkit/worker/runc"
"github.com/opencontainers/runc/libcontainer/system"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
"github.com/urfave/cli"
)
func init() {
flags := []cli.Flag{
cli.StringFlag{
Name: "oci-worker",
Usage: "enable oci workers (true/false/auto)",
Value: "auto",
},
cli.StringSliceFlag{
Name: "oci-worker-labels",
Usage: "user-specific annotation labels (com.example.foo=bar)",
},
cli.StringFlag{
Name: "oci-worker-snapshotter",
Usage: "name of snapshotter (overlayfs or native)",
Value: "auto",
},
cli.StringSliceFlag{
Name: "oci-worker-platform",
Usage: "override supported platforms for worker",
},
}
n := "oci-worker-rootless"
u := "enable rootless mode"
if system.RunningInUserNS() {
flags = append(flags, cli.BoolTFlag{
Name: n,
Usage: u,
})
} else {
flags = append(flags, cli.BoolFlag{
Name: n,
Usage: u,
})
}
registerWorkerInitializer(
workerInitializer{
fn: ociWorkerInitializer,
priority: 0,
},
flags...,
)
// TODO: allow multiple oci runtimes
}
func ociWorkerInitializer(c *cli.Context, common workerInitializerOpt) ([]worker.Worker, error) {
boolOrAuto, err := parseBoolOrAuto(c.GlobalString("oci-worker"))
if err != nil {
return nil, err
}
if (boolOrAuto == nil && !validOCIBinary()) || (boolOrAuto != nil && !*boolOrAuto) {
return nil, nil
}
labels, err := attrMap(c.GlobalStringSlice("oci-worker-labels"))
if err != nil {
return nil, err
}
snFactory, err := snapshotterFactory(common.root, c.GlobalString("oci-worker-snapshotter"))
if err != nil {
return nil, err
}
// GlobalBool works for BoolT as well
rootless := c.GlobalBool("oci-worker-rootless") || c.GlobalBool("rootless")
if rootless {
logrus.Debugf("running in rootless mode")
}
opt, err := runc.NewWorkerOpt(common.root, snFactory, rootless, labels)
if err != nil {
return nil, err
}
opt.SessionManager = common.sessionManager
platformsStr := c.GlobalStringSlice("oci-worker-platform")
if len(platformsStr) != 0 {
platforms, err := parsePlatforms(platformsStr)
if err != nil {
return nil, errors.Wrap(err, "invalid platforms")
}
opt.Platforms = platforms
}
w, err := base.NewWorker(opt)
if err != nil {
return nil, err
}
return []worker.Worker{w}, nil
}
func snapshotterFactory(commonRoot, name string) (runc.SnapshotterFactory, error) {
if name == "auto" {
if err := overlay.Supported(commonRoot); err == nil {
logrus.Debug("auto snapshotter: using overlayfs")
name = "overlayfs"
} else {
logrus.Debugf("auto snapshotter: using native, because overlayfs is not available for %s: %v", commonRoot, err)
name = "native"
}
}
snFactory := runc.SnapshotterFactory{
Name: name,
}
switch name {
case "native":
snFactory.New = native.NewSnapshotter
case "overlayfs": // not "overlay", for consistency with containerd snapshotter plugin ID.
snFactory.New = func(root string) (ctdsnapshot.Snapshotter, error) {
return overlay.NewSnapshotter(root)
}
default:
return snFactory, errors.Errorf("unknown snapshotter name: %q", name)
}
return snFactory, nil
}
func validOCIBinary() bool {
_, err := exec.LookPath("runc")
if err != nil {
logrus.Warnf("skipping oci worker, as runc does not exist")
return false
}
return true
}