mirror of https://github.com/kubernetes/kops.git
72 lines
1.5 KiB
Go
72 lines
1.5 KiB
Go
/*
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Copyright 2018 The Kubernetes 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 fs
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import (
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"context"
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"errors"
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"os"
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"time"
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)
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// ErrTimeout indicates the operation has timed out
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var ErrTimeout = errors.New("operation timeout")
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// WaitForFile is responsible for waiting for file to appear or timeout
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func WaitForFile(ctx context.Context, path string) error {
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doneCh := make(chan struct{}, 0)
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// @step: we wait for the bootstrap token file to appear
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go func() {
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ticker := time.NewTicker(5 * time.Second)
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defer ticker.Stop()
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for {
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select {
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case <-ctx.Done():
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return
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case <-ticker.C:
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if found, _ := FileExists(path); found {
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doneCh <- struct{}{}
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return
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}
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}
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}
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}()
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select {
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case <-ctx.Done():
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return ctx.Err()
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case <-doneCh:
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}
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return nil
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}
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// FileExists checks if a file exists
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func FileExists(path string) (bool, error) {
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if _, err := os.Stat(path); err != nil {
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if os.IsNotExist(err) {
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return false, nil
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}
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return false, err
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}
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return true, nil
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}
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