backup: prevent hang using --stdin-from-command if upload fails#21829
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What does this PR change? What problem does it solve?
When using
--stdin-from-command, thebackupcommand could hang untilmanually cancelled if the backup stopped before all subprocess output was
consumed, for example after a failed upload to the repository. This has been
fixed.
Was the change previously discussed in an issue or on the forum?
Fixes #5683
Checklist
[ ] I have added documentation for relevant changes (in the manual).changelog/unreleased/that describes the changes for our users (see template).