A volume whose containers must stop was copied twice: live first, then
with the containers stopped and --checksum. A live writer that truncates
a file under rsync (read errors mapping ...: No data available (61),
exit 23) aborted the run in the first pass, before the containers were
stopped, although the second pass rewrites every differing file anyway.
Seen in infinito-nexus CI on kix_kix_shared/objecticons.
The live copy now only warns when a stopped copy follows. Without a stop
it stays the only copy and still fails the run, and a failing stopped
copy still fails it.
The e2e test drives a writer that shrinks files mid-read; without the
fix it reproduces the CI failure verbatim.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
