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CI run #48 failed with: --- FAIL: TestRunInitShipsStartedAndFinished RunInit: ... fork/exec /tmp/.../restic: text file busy setupScript and setupScriptBin used os.WriteFile to write a shell script directly at the final path, then exec'd it. Under -race + many t.Parallel tests, a fork-from-another-goroutine could inherit the still-open writable fd from one of those WriteFile calls; the kernel returns ETXTBSY when the freshly-execed binary still has a writable fd anywhere on the system. Fix: write to "<path>.tmp", then os.Rename into place. The rename is a pure dirent op; by the time the final path exists, no process has a writable fd on its inode and exec is safe. -race + -count=5 on both runner packages now passes consistently.