hashicorp/packer · error

Error seeking beginning of temporary file for checksumming,

Error message

Error seeking beginning of temporary file for checksumming, continuing: %w

What it means

Plugin installation warning from InstallLatest: the temp file could not be rewound to its start before checksumming. The attempt is abandoned (continuing), and another checksummer/getter is tried; the error only surfaces in the aggregate if all attempts fail.

Source

Thrown at packer/plugin-getter/plugins.go:837

						errs = multierror.Append(errs, err)
						return nil, errs
					}
					defer func() {
						tmpFilePath := tmpFile.Name()
						tmpFile.Close()
						os.Remove(tmpFilePath)
					}()

					// write binary to tmp file
					_, err = io.Copy(tmpFile, remoteZipFile)
					_ = remoteZipFile.Close()
					if err != nil {
						err := fmt.Errorf("Error getting plugin, trying another getter: %w", err)
						errs = multierror.Append(errs, err)
						continue
					}
					if _, err := tmpFile.Seek(0, 0); err != nil {
						err := fmt.Errorf("Error seeking beginning of temporary file for checksumming, continuing: %w", err)
						errs = multierror.Append(errs, err)
						continue
					}

					// verify that the checksum for the zip is what we expect.
					if err := checksum.Checksummer.Checksum(checksum.Expected, tmpFile); err != nil {
						err := fmt.Errorf("%w. Is the checksum file correct ? Is the binary file correct ?", err)
						errs = multierror.Append(errs, err)
						continue
					}
					zr, err := zip.OpenReader(tmpFile.Name())
					if err != nil {
						errs = multierror.Append(errs, fmt.Errorf("zip : %v", err))
						return nil, errs
					}

					var copyFrom io.ReadCloser
					for _, f := range zr.File {

View on GitHub (pinned to eb36e3c3e4)

Solutions

1. Retry the plugin install — seek errors on temp files are typically transient
2. Check temp filesystem health if this repeats

When it happens

Trigger: Thrown at packer/plugin-getter/plugins.go:837 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of hashicorp/packer@eb36e3c3e4 (2026-09-05). Data as JSON: /api/errors/56f385884444c55f. Report an issue: GitHub.