{"record":{"id":"b3187ffbed3bf2d6","repo":"kubernetes/kops","slug":"unable-to-transfer-q-to-q-v","errorCode":null,"errorMessage":"unable to transfer %q to %q: %v","messagePattern":"unable to transfer %q to %q: (.+?)","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"pkg/assets/assetcopy/copyfile.go","lineNumber":96,"sourceCode":"\t} else {\n\t\ttargetSHA := string(targetSHABytes)\n\n\t\tif strings.TrimSpace(targetSHA) == expectedSHA {\n\t\t\tklog.V(8).Infof(\"found matching target sha for file: %q\", e.TargetFile)\n\t\t\treturn nil\n\t\t}\n\n\t\tklog.V(8).Infof(\"did not find same file, found mismatching target sha1 for file: %q\", e.TargetFile)\n\t}\n\n\tsource := e.SourceFile\n\ttarget := e.TargetFile\n\tsourceSha := e.SHA\n\n\tklog.V(2).Infof(\"copying bits from %q to %q\", source, target)\n\n\tif err := transferFile(ctx, e.VFSContext, e.Cluster, source, target, sourceSha); err != nil {\n\t\treturn fmt.Errorf(\"unable to transfer %q to %q: %v\", source, target, err)\n\t}\n\n\treturn nil\n}\n\n// transferFile downloads a file from the source location, validates the file matches the SHA,\n// and uploads the file to the target location.\nfunc transferFile(ctx context.Context, vfsContext *vfs.VFSContext, cluster *kops.Cluster, source string, target string, sha string) error {\n\t// TODO drop file to disk, as vfs reads file into memory.  We load kubelet into memory for instance.\n\t// TODO in s3 can we do a copy file ... would need to test\n\n\tdata, err := vfsContext.ReadFile(source)\n\tif err != nil {\n\t\tif os.IsNotExist(err) {\n\t\t\treturn fmt.Errorf(\"file not found %q: %v\", source, err)\n\t\t}\n\n\t\treturn fmt.Errorf(\"error downloading file %q: %v\", source, err)","sourceCodeStart":78,"sourceCodeEnd":114,"githubUrl":"https://github.com/kubernetes/kops/blob/4c8573c808a73d578c5eadc86d410646ea0b0d73/pkg/assets/assetcopy/copyfile.go#L78-L114","documentation":"CopyFile.Run() delegates the actual download-validate-upload to transferFile(); any failure there is wrapped as \"unable to transfer <source> to <target>: <reason>\". This names both ends of the copy so the developer can tell which asset and which repository failed.","triggerScenarios":"transferFile fails for any reason — source file missing (784), download error (785), VFS path build error (786/787), sha parse/hash mismatch (788/789), or the final WriteFile to the target repository failing (permissions, bucket missing, quota).","commonSituations":"`kops get assets --copy` targeting a private S3/GCS bucket that the current credentials cannot write to; source mirror temporarily down; wrong file-repository URL in the cluster spec.","solutions":["Diagnose the innermost error after the second colon — it carries the real cause.","Check credentials/IAM (s3:PutObject, storage.objects.create) for the target repository.","Verify both source canonical URL and target file-repository URL in `kops get assets --copy` flags.","Re-run the copy after fixing; CopyFile skips assets whose target .sha file already matches."],"exampleFix":"// before\nkops get assets --copy --file-repository s3://wrong-bucket/path\n// after\nkops get assets --copy --file-repository s3://my-assets-bucket/bin","handlingStrategy":"try-catch","validationCode":"// Verify both endpoints before copying:\nif code := headStatus(sourceFile); code != 200 { return fmt.Errorf(\"source %s -> %d\", sourceFile, code) }\nif err := canWrite(targetRepo); err != nil { return fmt.Errorf(\"target %s not writable: %v\", targetRepo, err) }","typeGuard":null,"tryCatchPattern":"err := copyFileTask.Run()\nif err != nil {\n    var inner error\n    if strings.HasPrefix(err.Error(), \"unable to transfer\") {\n        inner = errors.Unwrap(err) // or parse the text; root cause follows \": \"\n    }\n    return fmt.Errorf(\"copy failed: %w\", err)\n}","preventionTips":["Check the innermost error text after the two colons for the real cause","Confirm IAM write permissions on the target repository first","Verify source URLs exist before bulk runs","Use a file repository whose URL scheme kops recognizes (s3://, gs://, azureblob://, file://)"],"tags":["go","asset-copy","error-wrapping","vfs"],"backgroundTag":"unable-to-transfer-asset","analyzedSha":"4c8573c808a73d578c5eadc86d410646ea0b0d73","analyzedAt":"2026-09-05T04:13:19.212Z","contentChangedAt":"2026-09-05T04:13:19.212Z","schemaVersion":2},"datasetVersion":"2026-09-12T07:17:12.445Z"}