ROM with size information

[Stefan Thöni]

Hello Genodians

For our current use case we need to provide a single file e.g.
continuous binary data with size information to a component. We cannot
use to standard ROM session as it doesn't provide size information. We
also need the ability to specify a file not known at development time
through the session label in the deploy config as is possible with the
fs_rom component.

We have discussed several solution strategies:

a) Provide the file through a file system session: Besides the drawback
of unnecessary complexity this also does not give us the ability to
specify the desired file with the session label.

b) Add content size information to the ROM session and update the fs_rom
component to provide it. This would seem the most straightforward
solution, but for the sacredness of the ROM session.

c) Create an updated or forked fs_rom component with the ability to
provide single files as tar archives. This would allow us to consume the
tar with vfs and have the size information available.

Which strategy should we prefer? Are there any other solutions that
satisfy our requirements?

Best regards
Stefan

-- 
Freundliche Grüsse

Stefan Thöni
Chairman of the Board
Senior Security Architect

gapfruit AG
Baarerstrasse 135
6300 Zug
https://gapfruit.com
-------------- next part --------------
A non-text attachment was scrubbed...
Name: 0x05D66A288F9939FF.asc
Type: application/pgp-keys
Size: 25417 bytes
Desc: not available
URL: <http://lists.genode.org/pipermail/users/attachments/20200117/4aa46546/attachment-0001.key>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: stefan_thoeni.vcf
Type: text/x-vcard
Size: 173 bytes
Desc: not available
URL: <http://lists.genode.org/pipermail/users/attachments/20200117/4aa46546/attachment-0001.vcf>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 833 bytes
Desc: OpenPGP digital signature
URL: <http://lists.genode.org/pipermail/users/attachments/20200117/4aa46546/attachment-0001.sig>