/usr/share/tcos/hooks-addons/08pcimodules is in initramfs-tools-tcos 0.89.93ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | # hook addon to load pcimodules
# need pcimodules
cpifexists /usr/bin/pcimodules /bin/
mv -f $DESTDIR/usr/lib/libz.so.1 $DESTDIR/lib/libz.so.1 2>/dev/null
mv -f $DESTDIR/usr/lib/libpci.so.3 $DESTDIR/lib/libpci.so.3 2>/dev/null
mv -f $DESTDIR/$LIB_MULTIARCH/libpci.so.3 $DESTDIR/lib/libpci.so.3 2>/dev/null
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