What causes "failed to seek tar archive: %w" in nektos/act?

Check the wrapped error; the tar archive stream may be invalid or already consumed.

failed to seek tar archive: %w

Error message

failed to seek tar archive: %w

What it means

Error "failed to seek tar archive: %w" thrown in nektos/act.

Source

Thrown at pkg/container/docker_run.go:799

logger.Debugf("Extracting content from '%s' to '%s'", tarFile.Name(), dstPath)
_, err = tarFile.Seek(0, 0)
if err != nil {
	return fmt.Errorf("failed to seek tar archive: %w", err)
}

View on GitHub (pinned to 4f41128141)

Solutions

Check the wrapped error; the tar archive stream may be invalid or already consumed.
Retry the operation; regenerate the archive if the source files changed mid-copy.

When it happens

Trigger: Thrown at pkg/container/docker_run.go:799 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of nektos/act@4f41128141 (2026-08-15). Data as JSON: /api/errors/78c3f7760df48844. Report an issue: GitHub.