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Add a new builder for tarballs and released artifacts
Signed-off-by: Davanum Srinivas <davanum@gmail.com> fix the arch usage Signed-off-by: Davanum Srinivas <davanum@gmail.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,211 @@ | ||
| /* | ||
| Copyright 2018 The Kubernetes Authors. | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
|
|
||
| package kube | ||
|
|
||
| import ( | ||
| "archive/tar" | ||
| "compress/gzip" | ||
| "context" | ||
| "fmt" | ||
| "io" | ||
| "net" | ||
| "net/http" | ||
| "os" | ||
| "path/filepath" | ||
| "strings" | ||
| "time" | ||
|
|
||
| "sigs.k8s.io/kind/pkg/log" | ||
| ) | ||
|
|
||
| type remoteBuilder struct { | ||
| version string | ||
| logger log.Logger | ||
| url string | ||
| } | ||
|
|
||
| var _ Builder = &remoteBuilder{} | ||
|
|
||
| func NewURLBuilder(logger log.Logger, url string) (Builder, error) { | ||
| return &remoteBuilder{ | ||
| version: "", | ||
| logger: logger, | ||
| url: url, | ||
| }, nil | ||
| } | ||
|
|
||
| func NewReleaseBuilder(logger log.Logger, version, arch string) (Builder, error) { | ||
| url := "https://dl.k8s.io/" + version + "/kubernetes-server-linux-" + arch + ".tar.gz" | ||
| return &remoteBuilder{ | ||
| version: version, | ||
| logger: logger, | ||
| url: url, | ||
| }, nil | ||
| } | ||
|
|
||
| // Build implements Bits.Build | ||
| func (b *remoteBuilder) Build() (Bits, error) { | ||
|
|
||
| tmpDir, err := os.MkdirTemp(os.TempDir(), "k8s-tar-extract-") | ||
| if err != nil { | ||
| return nil, fmt.Errorf("error creating temporary directory for tar extraction: %w", err) | ||
| } | ||
|
|
||
| tgzFile := filepath.Join(tmpDir, "kubernetes-"+b.version+"-server-linux-amd64.tar.gz") | ||
| err = b.downloadURL(b.url, tgzFile) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("error downloading file: %w", err) | ||
| } | ||
|
|
||
| err = extractTarball(tgzFile, tmpDir, b.logger) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("error extracting tgz file: %w", err) | ||
| } | ||
|
|
||
| binDir := filepath.Join(tmpDir, "kubernetes/server/bin") | ||
| contents, err := os.ReadFile(filepath.Join(binDir, "kube-apiserver.docker_tag")) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| sourceVersionRaw := strings.TrimSpace(string(contents)) | ||
| return &bits{ | ||
| binaryPaths: []string{ | ||
| filepath.Join(binDir, "kubeadm"), | ||
| filepath.Join(binDir, "kubelet"), | ||
| filepath.Join(binDir, "kubectl"), | ||
| }, | ||
| imagePaths: []string{ | ||
| filepath.Join(binDir, "kube-apiserver.tar"), | ||
| filepath.Join(binDir, "kube-controller-manager.tar"), | ||
| filepath.Join(binDir, "kube-scheduler.tar"), | ||
| filepath.Join(binDir, "kube-proxy.tar"), | ||
| }, | ||
| version: sourceVersionRaw, | ||
| }, nil | ||
| } | ||
|
|
||
| func (b *remoteBuilder) downloadURL(url string, destPath string) error { | ||
| output, err := os.Create(destPath) | ||
| if err != nil { | ||
| return fmt.Errorf("error creating file for download %q: %v", destPath, err) | ||
| } | ||
| defer output.Close() | ||
|
|
||
| b.logger.V(0).Infof("Downloading %q", url) | ||
|
|
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| // Create a client with custom timeouts | ||
| // to avoid idle downloads to hang the program | ||
| httpClient := &http.Client{ | ||
| Transport: &http.Transport{ | ||
| Proxy: http.ProxyFromEnvironment, | ||
| DialContext: (&net.Dialer{ | ||
| Timeout: 30 * time.Second, | ||
| KeepAlive: 30 * time.Second, | ||
| }).DialContext, | ||
| TLSHandshakeTimeout: 10 * time.Second, | ||
| ResponseHeaderTimeout: 30 * time.Second, | ||
| IdleConnTimeout: 30 * time.Second, | ||
| }, | ||
| } | ||
|
|
||
| // this will stop slow downloads after 3 minutes | ||
| // and interrupt reading of the Response.Body | ||
| ctx, cancel := context.WithTimeout(context.Background(), 3*time.Minute) | ||
| defer cancel() | ||
|
|
||
| req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil) | ||
| if err != nil { | ||
| return fmt.Errorf("cannot create request: %v", err) | ||
| } | ||
|
|
||
| response, err := httpClient.Do(req) | ||
| if err != nil { | ||
| return fmt.Errorf("error doing HTTP fetch of %q: %v", url, err) | ||
| } | ||
| defer response.Body.Close() | ||
|
|
||
| if response.StatusCode >= 400 { | ||
| return fmt.Errorf("error response from %q: HTTP %v", url, response.StatusCode) | ||
| } | ||
|
|
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| start := time.Now() | ||
| defer func() { | ||
| b.logger.V(2).Infof("Copying %q to %q took %q", url, destPath, time.Since(start)) | ||
| }() | ||
|
|
||
| _, err = io.Copy(output, response.Body) | ||
| if err != nil { | ||
| return fmt.Errorf("error downloading HTTP content from %q: %v", url, err) | ||
| } | ||
| return nil | ||
| } | ||
|
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||
| func extractTarball(tarPath, destDirectory string, logger log.Logger) (err error) { | ||
| // Open the tar file | ||
| f, err := os.Open(tarPath) | ||
| if err != nil { | ||
| return fmt.Errorf("opening tarball: %w", err) | ||
| } | ||
| defer f.Close() | ||
|
|
||
| gzipReader, err := gzip.NewReader(f) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| tr := tar.NewReader(gzipReader) | ||
|
|
||
| numFiles := 0 | ||
| for { | ||
| hdr, err := tr.Next() | ||
| if err == io.EOF { | ||
| break | ||
| } | ||
| if err != nil { | ||
| return fmt.Errorf("reading tarfile %s: %w", tarPath, err) | ||
| } | ||
|
|
||
| if hdr.FileInfo().IsDir() { | ||
| continue | ||
| } | ||
|
|
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| if err := os.MkdirAll( | ||
| filepath.Join(destDirectory, filepath.Dir(hdr.Name)), os.FileMode(0o755), | ||
| ); err != nil { | ||
| return fmt.Errorf("creating image directory structure: %w", err) | ||
| } | ||
|
|
||
| f, err := os.Create(filepath.Join(destDirectory, hdr.Name)) | ||
| if err != nil { | ||
| return fmt.Errorf("creating image layer file: %w", err) | ||
| } | ||
|
|
||
| if _, err := io.CopyN(f, tr, hdr.Size); err != nil { | ||
| f.Close() | ||
| if err == io.EOF { | ||
| break | ||
| } | ||
|
|
||
| return fmt.Errorf("extracting image data: %w", err) | ||
| } | ||
| f.Close() | ||
|
|
||
| numFiles++ | ||
| } | ||
|
|
||
| logger.V(2).Infof("Successfully extracted %d files from image tarball %s", numFiles, tarPath) | ||
| return err | ||
| } |
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