{"record":{"id":"63e6f8edcd0590d5","repo":"kubernetes/kops","slug":"cannot-determine-hash-for-q-have-you-specified-a","errorCode":null,"errorMessage":"cannot determine hash for %q (have you specified a valid file location?)","messagePattern":"cannot determine hash for %q \\(have you specified a valid file location\\?\\)","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"pkg/assets/builder.go","lineNumber":444,"sourceCode":"\t\t\t\thash, err := hashing.FromString(fields[0])\n\t\t\t\tif err != nil {\n\t\t\t\t\treturn nil, err\n\t\t\t\t}\n\n\t\t\t\tdownloadedFileHashes.Store(u.String(), hash)\n\n\t\t\t\treturn hash, nil\n\t\t\t}\n\t\t\tif ext == \".sha256\" {\n\t\t\t\tklog.V(2).Infof(\"Unable to read new sha256 hash file (is this an older/unsupported kubernetes release?)\")\n\t\t\t}\n\t\t}\n\t}\n\n\tif a.assetsLocation != nil && a.assetsLocation.FileRepository != nil {\n\t\treturn nil, fmt.Errorf(\"you might have not staged your files correctly, please execute 'kops get assets --copy'\")\n\t}\n\treturn nil, fmt.Errorf(\"cannot determine hash for %q (have you specified a valid file location?)\", u)\n}\n\nfunc (a *AssetBuilder) remapURL(canonicalURL *url.URL) (*url.URL, error) {\n\tf := \"\"\n\tif a.assetsLocation != nil {\n\t\tf = values.StringValue(a.assetsLocation.FileRepository)\n\t}\n\tif f == \"\" {\n\t\treturn nil, fmt.Errorf(\"assetsLocation.fileRepository must be set to remap asset %v\", canonicalURL)\n\t}\n\n\tfileRepo, err := url.Parse(f)\n\tif err != nil {\n\t\treturn nil, fmt.Errorf(\"unable to parse assetsLocation.fileRepository %q: %v\", f, err)\n\t}\n\n\tfileRepo.Path = path.Join(fileRepo.Path, canonicalURL.Path)\n\t// Escape commas, which are legal in a path but separate locations in CompactString.","sourceCodeStart":426,"sourceCodeEnd":462,"githubUrl":"https://github.com/kubernetes/kops/blob/4c8573c808a73d578c5eadc86d410646ea0b0d73/pkg/assets/builder.go#L426-L462","documentation":"findHash could not determine the SHA256 hash for the given URL: it was not in the well-known hash table, no .sha256 hash file was published alongside the file (common for older Kubernetes releases), and download-based hashing failed or was not possible. kops cannot verify the asset, so it refuses to continue.","triggerScenarios":"RemapFile on a file URL with no known hash, no sibling .sha256 file, and no successful download to compute the hash — e.g. unsupported/old Kubernetes release or unreachable download source.","commonSituations":"Pinning an old/unsupported k8s version that predates published sha256 files; air-gapped clusters where the canonical download URL is unreachable; typo in the file location/URL.","solutions":["Check the file location URL is correct and reachable (curl it).","Use a supported Kubernetes version whose release publishes .sha256 files.","Ensure network/egress (or proxy) allows kops to download the file to compute its hash.","If using a file repository, stage the file plus its .sha256 via 'kops get assets --copy'."],"exampleFix":"// before\n--kubernetes-version=1.15.3 # no published .sha256, air-gapped env\n// after\n--kubernetes-version=1.28.9 # supported release with .sha256 files\n# or ensure https://storage.googleapis.com/kubernetes-release/release/... is reachable / proxied","handlingStrategy":"try-catch","validationCode":"// verify the file (and .sha256) are reachable before remapping\nresp, err := http.Head(u.String())\nif err != nil || resp.StatusCode != 200 {\n\treturn fmt.Errorf(\"cannot reach %q to determine hash\", u)\n}","typeGuard":null,"tryCatchPattern":"fileAsset, err := assetBuilder.RemapFile(u, knownHash)\nif err != nil {\n\tif strings.Contains(err.Error(), \"cannot determine hash\") {\n\t\t// fall back: pre-download the file and pass a knownHash computed locally\n\t\treturn fallbackHashAndRemap(u)\n\t}\n\treturn err\n}","preventionTips":["Use supported Kubernetes releases that publish .sha256 files.","Pass a knownHash from an official release metadata file when available.","Confirm network/egress access to the canonical download host in CI and air-gapped environments.","Double-check the file URL/version string for typos."],"tags":["assets","hashing","download","kubernetes-release"],"backgroundTag":"hash-not-determinable","analyzedSha":"4c8573c808a73d578c5eadc86d410646ea0b0d73","analyzedAt":"2026-09-05T04:13:19.212Z","contentChangedAt":"2026-09-05T04:13:19.212Z","schemaVersion":2},"datasetVersion":"2026-09-12T12:17:11.808Z"}