We *assume* that when /sys is read-only, we're running in a container. But there can other reasons, for example root is mount ro and nobody has mounted /sys yet, or somebody forgot to add /sys to the list of filesystem not to remount ro in a sandbox. So let's actually say what we know instead of assuming. systemd-fstab-generator was reporting that it's running in a container and I spent a good few minutes trying to figure out why 'systemd-detect-virt -c' disagrees, before noticing that it's just checking a different condition.
System and Service Manager
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