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sftp: persist "ssh command exited" error

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If our ssh process has died, not only the next, but all subsequent
calls to clientError() should indicate the error.

restic output when the ssh process is killed with "kill -9":

  Save(<data/afb68adbf9>) returned error, retrying after 253.661803ms: Write: failed to send packet header: write |1: file already closed
  Save(<data/afb68adbf9>) returned error, retrying after 580.752212ms: ssh command exited: signal: killed
  Save(<data/afb68adbf9>) returned error, retrying after 790.150468ms: ssh command exited: signal: killed
  Save(<data/afb68adbf9>) returned error, retrying after 1.769595051s: ssh command exited: signal: killed
  [...]
  error in cleanup handler: ssh command exited: signal: killed

Before this patch:

  Save(<data/de698d934f>) returned error, retrying after 252.84163ms: Write: failed to send packet header: write |1: file already closed
  Save(<data/de698d934f>) returned error, retrying after 660.236963ms: OpenFile: failed to send packet header: write |1: file already closed
  Save(<data/de698d934f>) returned error, retrying after 568.049909ms: OpenFile: failed to send packet header: write |1: file already closed
  Save(<data/de698d934f>) returned error, retrying after 2.428813824s: OpenFile: failed to send packet header: write |1: file already closed
  [...]
  error in cleanup handler: failed to send packet header: write |1: file already closed
This commit is contained in:
Jakob Unterwurzacher 2018-05-30 19:28:14 +02:00
parent 185b60c22b
commit dd3b9910ee
1 changed files with 3 additions and 1 deletions
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4
internal/backend/sftp/sftp.go
View file

@ -75,7 +75,9 @@ func startClient(program string, args ...string) (*SFTP, error) {
go func() {
err := cmd.Wait()
debug.Log("ssh command exited, err %v", err)
ch <- errors.Wrap(err, "cmd.Wait")
for {
ch <- errors.Wrap(err, "ssh command exited")
}
}()
// open the SFTP session