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How do I create a loopback mount which exposes a given directory as a read-only filesystem? As contrasted with a loopback mount which exposes a file as a filesystem?

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up vote 11 down vote accepted

I would imagine that mount -o bind,ro /some/directory /where/you/want/it/to/be/readonly should do the trick.

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Just be sure that you're on at least a 2.6.26 kernel or this will silently bind mount with the same options as the original mount-point. See: lwn.net/Articles/281157 –  Evan Anderson Jul 21 '09 at 0:55
    
Works like a charm, thanks! And thanks for the caveat, Evan. –  Avdi Jul 22 '09 at 14:22
    
should be able to do mount --bind -o ro, too –  warren Nov 30 '09 at 8:22

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