After that was started, I invested some time on a long-standing wishlist bug on bts.turmzimmer.net, so that one can see even the RC-bugs related to a (source) package which would be ignored otherwise if at least one bug would be shown. This required some more code cleanup first. Now everything should work.
I started the afternoon with creating a list of open tasks that are not marked as RC bugs, and dependencies between those. During that, I learned that the security teams thinks that we lost the security sparc autobuilder - not something that makes me happy, and something that needs to be fixed independent of Etch. Actually, it seems the autobuilder is just recovering, but I'll continue looking at it.
One item open on the list of open tasks is the final usage of apt-keys (which involves me in more than one way), so I started a testbed for having the Release-file signed by more than one key, and check whether apt is still happy. Adding another signature turned out to be quite easy with just adding it to the Release.gpg-file.
If there is more than one signature on the release-file, but not all keys are know to apt, apt warns, but doesn't stop:
W: There are no public key available for the following key IDs: 010908312D230C5F
If however there is a bad signature, apt fails, even if there is also a good signature. (And please note, if the key is unknown, the signature is not bad but unknown - this gives the interesting behaviour that removing a trusted key by apt-key my remove the need to explicitly confirm to go on with the upgrade.)
Summary on apt-keys
Current behaviour is ok, we just need to sign one file extra with each stable (point) release, and this can be done with: gpg --no-default-keyring --secret-keyring srm-secring.gpg -b --armor < etch/Release >> etch/Release.gpg (or rather, sign off-line, and append on ftp-master).
The behaviour with multiple keys might look a bit strange, but IMHO we can live with it.
I'm currently preparing to use real keys, and publish the result on some place where anybody could test it (for the latest sarge point release), and I hope we can put it on for the next point release on ftp-master.