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utils.go
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/
utils.go
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// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
package runtime
import (
"bytes"
"context"
"os"
"github.com/cosi-project/runtime/pkg/controller"
"github.com/cosi-project/runtime/pkg/safe"
"github.com/cosi-project/runtime/pkg/state"
"github.com/siderolabs/gen/optional"
"github.com/siderolabs/talos/pkg/machinery/resources/runtime"
)
// WaitForDevicesReady waits for devices to be ready.
//
// It is a helper function for controllers.
func WaitForDevicesReady(ctx context.Context, r controller.Runtime, nextInputs []controller.Input) error {
// set inputs temporarily to a service only
if err := r.UpdateInputs([]controller.Input{
{
Namespace: runtime.NamespaceName,
Type: runtime.DevicesStatusType,
ID: optional.Some(runtime.DevicesID),
Kind: controller.InputWeak,
},
}); err != nil {
return err
}
for {
select {
case <-ctx.Done():
return ctx.Err()
case <-r.EventCh():
}
status, err := safe.ReaderGetByID[*runtime.DevicesStatus](ctx, r, runtime.DevicesID)
if err != nil {
if state.IsNotFoundError(err) {
continue
}
return err
}
if status.TypedSpec().Ready {
// condition met
break
}
}
// restore inputs
if err := r.UpdateInputs(nextInputs); err != nil {
return err
}
// queue an update to reprocess with new inputs
r.QueueReconcile()
return nil
}
// updateFile is like `os.WriteFile`, but it will only update the file if the
// contents have changed.
func updateFile(filename string, contents []byte, mode os.FileMode) error {
oldContents, err := os.ReadFile(filename)
if err == nil && bytes.Equal(oldContents, contents) {
return nil
}
return os.WriteFile(filename, contents, mode)
}