[Libguestfs] [nbdkit PATCH 6/9] sh: Implement .cache script callback

[Richard W.M. Jones]

For this plugin, if a tri-state can_cache is implemented, the code
from sh_can_fua could be reused:

https://github.com/libguestfs/nbdkit/blob/7a4f38f98920a1192e5c50ea9bd212e759e3f4e7/plugins/sh/sh.c#L530

Rich.

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