When operating in unprivileged mode we might not be able to execute the necessary operations to make a disk image read-only (because FS_IMMUTABEL_FL needs privs for example), and syncing (because for that we might need to open the root inode, but that might not be possible from the outside). Let's deal with that by making these operation optional: if they work great, if not they don't.
System and Service Manager
Details
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