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rclone: treat "file already closed" as command startup error
Since #3940 the rclone backend returns the commands exit code if it fails to start. The list of expected errors was missing the "file already closed"-error which can occur if the http test request first learns about the closed pipe to rclone before noticing the canceled context. Go internally makes sure that a file descriptor is unusable once it was closed, thus this cannot have unintended side effects (like accidentally reading from the wrong file due to a reused file descriptor).
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@ -239,7 +239,7 @@ func newBackend(cfg Config, lim limiter.Limiter) (*Backend, error) {
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// wait for rclone to exit
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wg.Wait()
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// try to return the program exit code if communication with rclone has failed
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if be.waitResult != nil && (errors.Is(err, context.Canceled) || errors.Is(err, io.ErrUnexpectedEOF) || errors.Is(err, syscall.EPIPE)) {
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if be.waitResult != nil && (errors.Is(err, context.Canceled) || errors.Is(err, io.ErrUnexpectedEOF) || errors.Is(err, syscall.EPIPE) || errors.Is(err, os.ErrClosed)) {
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err = be.waitResult
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}
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