Some info on setup release-stopper bug

[Robert Collins]

On Wed, 2002-11-13 at 09:18, Max Bowsher wrote:
> I've been digging around in setup hunting for the 'erroneous use of prev
> versions' bug. It seems to be due to the fact that in processOneDependency
> in package_version.cc, the first satisfactory version from the versions set
> is chosen.

Thanks, that was it, and I've fixed it. The rest of the email is
skippable for non-setup hackers.

> Since packageversion doesn't expose its trust level, and
> PackageSpecifications know nothing about trust levels, fixing this requires
> an architectural descision.

Well, PackageSpecifications are for versioning requirements, whereas
trusts are administratively set based on confidence of package
quality/stability. For instance you might have a local package that
*needs* squid-3.0-PRE5 which is experimental, and thus you want to pull
that in regardless of the published trust. 

To get a trust level, you query the package meta data, not a specific
verison. Specific versions shouldn't know about their trust level,
because it changes all the time. Package metadata knows about trusts.

So this:
packageversion trusted = mypackagemetadata->trustp(sometrustlevel);

returns a packageversion that matches or exceeds sometrustlevel,
according to the trust selection heuristics.


> Robert, hope this helps.

It did, thanks.
Rob

-- 
---
GPG key available at: http://users.bigpond.net.au/robertc/keys.txt.
---

-- 
---
GPG key available at: http://users.bigpond.net.au/robertc/keys.txt.
---
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 189 bytes
Desc: This is a digitally signed message part
URL: <http://cygwin.com/pipermail/cygwin-apps/attachments/20021124/4fe8ac26/attachment.sig>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 189 bytes
Desc: This is a digitally signed message part
URL: <http://cygwin.com/pipermail/cygwin-apps/attachments/20021124/4fe8ac26/attachment-0001.sig>