gpg on read-only filesystem

[Fourhundred Thecat]

On 22/10/2019 17.54, Friedhelm Waitzmann wrote:
> A solution for the verify use case: Just read the manual
> (<https://www.gnupg.org/documentation/manuals/gnupg/GPG-Configuration-Options.html#index-auto_002dcheck_002dtrustdb>)
> and use “--no-auto-check-trustdb”.

thanks, but using the "--no-auto-check-trustdb" does not help. I still
get the error:

$ gpg --verify --no-auto-check-trustdb file.sig
gpg: assuming signed data in 'file'
gpg: Signature made 2019-10-24T21:33:21 CEST
gpg:                using RSA key 88B5AAEE121345AA
gpg: Fatal: can't open '/home/testuser/.gnupg/trustdb.gpg': Operation
not permitted