Bug#887863: Bug#887629: libc6: bad upgrade path: libexpat1 unpacked and python3 called before libc6 unpacked

[Niko Tyni]

On Sun, Jan 21, 2018 at 05:32:01AM +0100, Guillem Jover wrote:
> On Sun, 2018-01-21 at 02:59:53 +0100, Andreas Beckmann wrote:
> > Control: clone -1 -2
> > Control: retitle -2 libglib2.0-dev: needs dummy empty prerm
> > Control: reassign -2 libglib2.0-dev 2.54.2-1
> > 
> > >> On Sat, Jan 20, 2018 at 05:07:30PM +0100, Andreas Beckmann wrote:>>> For now, I'd suggest the dummy empty libglib2.0-dev.prerm, but if this
> > Even if python is going to get fixed, this probably won't help
> > libglib2.0-dev (which drops the python dependency in buster), therefore
> > it will need to add the dummy empty prerm to mitigate this issue.
> 
> I don't see why this would be needed. If python gets fixed to use
> Pre-Depends, then it does not matter whether libglib2.0-dev stops
> depending on it, as python should then be always usable even when
> just unpacked.

stretch# apt --no-install-recommends install glib2.0-dev
[...]
stretch# dpkg --unpack libexpat1_2.2.5-3_amd64.deb # from sid
[...]
stretch# dpkg --unpack libglib2.0-dev_2.54.3-1_amd64.deb # from sid
/usr/bin/python3: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.25' not found (required by /lib/x86_64-linux-gnu/libexpat.so.1)
dpkg: warning: subprocess old pre-removal script returned error exit status 1
dpkg: trying script from the new package instead ...
dpkg: error processing archive libglib2.0-dev_2.54.3-1_amd64.deb (--unpack):
 there is no script in the new version of the package - giving up
/usr/bin/python3: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.25' not found (required by /lib/x86_64-linux-gnu/libexpat.so.1)
dpkg: error while cleaning up:
 subprocess installed post-installation script returned error exit status 1

No python3 change in sid/buster is going to prevent this afaics?
-- 
Niko Tyni   ntyni at debian.org