Re: testing config/preinst mods: one approach
> > To use this approach, place these replacement apt-extracttemplates and
> > dpkg-deb scripts in your path before /usr/bin. Extract the original
> > control files from a package and put them in a subdirectory of
> > override directory named identically to the .deb file in
> > /var/cache/apt/archives. Then edit the modified files freely and
> > install as usual.
> I did this and get:
> alhambra:~# apt-get install tetex-bin 2>&1 | tee 14.31.log
> Reading Package Lists...
> Building Dependency Tree...
> Reading changelogs...
> apt-extracttemplates: can't get archive from Check
> 1 packages upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
> Need to get 0B/3693kB of archives. After unpacking 24.6kB will be used.
> USING /root/control-overrides/tetex-bin_2.0.2-14.31_i386.deb/
> dpkg: error processing /var/cache/apt/archives/tetex-bin_2.0.2-14.31_i386.deb (--unpack):
> failed to open package info file `/var/lib/dpkg/tmp.ci/control' for reading: No such file or directory
> Errors were encountered while processing:
> E: Sub-process /usr/bin/dpkg returned an error code (1)
The control file not being found is being issued after
apt-extracttemplates is long over since the USING message you see
there is issued by dpkg-deb --control. It looks like your
didn't contain a control file. Did you populate it with all the files
from dpkg-deb --control? I just did the following steps exactly and
it worked fine:
dpkg -P --force-depends tetex-bin
apt-get --download-only install tetex-bin
/usr/bin/dpkg-deb --control /var/cache/apt/archives/tetex-bin_2.0.2-14_i386.deb tetex-bin_2.0.2-14_i386.deb
apt-get install tetex-bin
> I looked in the code of apt-extracttemplates, but I don't know much
> Perl. It seems that it is getting the line "Check 0.5.00,1.2.34" from
> its filehandle, but I don't understand this (there ain't such thing as
> stdin (-|, right?) when I call apt-extracttemplates $filename)
Open you open(P, "-|"), perl forks. The child's stdout is read by the
parent from the filehandle P. So what's read from P is the output of
/usr/bin/apt-extracttemplates run with the same arguments that were
passed to the real one. Try running /usr/bin/apt-extracttemplates on
the download .deb file and see what you get. I get this:
tetex-bin 2.0.2-14 /tmp/tetex-bin.template.99790 /tmp/tetex-bin.config.99791
which looks right. I'm not sure where the "Check" came from other
than maybe some output from apt-extracttemplates.
Thanks for giving it a try. I'd be interested to know what the
problem was when you track it down.