Get SQL dump from readonly FS

[Hannes Dorbath <light@xxxxxxxxxxxxxxxxxxxx>]

Is there any way for PostgreSQL to start up on a read only file system 
for the sole purpose of creating a dump?

Background is that I like to create a SQL dump from file system 
snapshot. I guess the answer is a plain "No." ;)

Thanks.


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Regards,
Hannes Dorbath