Merge branch 'jk/run-command-capture'
The run-command interface was easy to abuse and make a pipe for us to read from the process, wait for the process to finish and then attempt to read its output, which is a pattern that lead to a deadlock. Fix such uses by introducing a helper to do this correctly (i.e. we need to read first and then wait the process to finish) and also add code to prevent such abuse in the run-command helper. * jk/run-command-capture: run-command: forbid using run_command with piped output trailer: use capture_command submodule: use capture_command wt-status: use capture_command run-command: introduce capture_command helper wt_status: fix signedness mismatch in strbuf_read call wt-status: don't flush before running "submodule status"
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