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ctr (which runs in the getty or ssh container) relies on sharing files in /tmp
with containerd (which runs in the host mount namespace). Specifically it
currently uses paths under /tmp/containerd for the stdio FIFOs of containers, resulting in:
# ctr run -t docker.io/library/redis:alpine test
ctr: rpc error: code = Unknown desc = runtime create failed: runc create failed: container with id exists: test
Currently it is not possible to specify a non-existent source directory for a
bind mount, so we cannot easily bind just /tmp/containerd. Sharing all of /tmp
doesn't sound like a terrible idea anyway.
Defering updating the sha in *.yml until after some further changes to these packages.
Signed-off-by: Ian Campbell <ian.campbell@docker.com>