On Wed, 25 Mar 2020 at 13:15:03 +0000, Aurelien Jarno wrote:
> debian/debhelper.in/libc.preinst, debian/rules.d/debhelper.mk: there is no 
> easy way to check if a file belongs to a package with usrmerge. Just drop all 
> safety checks...  Closes: #954915.

The /usr merge merges /foo with /usr/foo (for some values of foo) and
nothing else, so if you would prefer to keep those checks, you could do
something like this:

        if dpkg-query -S "${lib#/usr}" >/dev/null 2>&1 ; then

        if dpkg-query -S "/usr${lib#/usr}" >/dev/null 2>&1 ; then

which will in particular treat /usr/lib/whatever as equivalent to

(And the same for the quicker check involving libcfiles - but I don't
understand how or whether that one works, because it seems to be telling
grep to look for ^ and $ as literals rather than as anchors, which seems
wrong to me. But perhaps I'm missing something there.)


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