/usr/share/initramfs-tools/hooks/udev is in udev 232-25+deb9u8.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 | #!/bin/sh -e
PREREQS=""
prereqs() { echo "$PREREQS"; }
case "$1" in
prereqs)
prereqs
exit 0
;;
esac
. /usr/share/initramfs-tools/hook-functions
mkdir -p $DESTDIR/lib/systemd
copy_exec /lib/systemd/systemd-udevd /lib/systemd
copy_exec /bin/udevadm /bin
# copy compat symlink
cp -a /sbin/udevadm $DESTDIR/sbin/udevadm
mkdir -p $DESTDIR/etc/udev
cp -p /etc/udev/udev.conf $DESTDIR/etc/udev/
# copy .link files containing interface naming definitions
mkdir -p $DESTDIR/lib/systemd/network/
find /lib/systemd/network -name '*.link' -execdir cp -pt $DESTDIR/lib/systemd/network/ '{}' +
if [ -d /etc/systemd/network ]; then
find /etc/systemd/network -name '*.link' -execdir cp -pt $DESTDIR/lib/systemd/network/ '{}' +
fi
mkdir -p $DESTDIR/lib/udev/rules.d/
for rules in 50-firmware.rules 50-udev-default.rules 60-persistent-storage.rules \
61-persistent-storage-android.rules 71-seat.rules 73-special-net-names.rules \
73-usb-net-by-mac.rules 75-net-description.rules \
80-net-setup-link.rules 80-drivers.rules; do
if [ -e /etc/udev/rules.d/$rules ]; then
cp -p /etc/udev/rules.d/$rules $DESTDIR/lib/udev/rules.d/
elif [ -e /lib/udev/rules.d/$rules ]; then
cp -p /lib/udev/rules.d/$rules $DESTDIR/lib/udev/rules.d/
fi
done
# now copy all custom udev rules which don't have an equivalent in /lib (e. g.
# 70-persistent-net.rules or similar); They might contain network names or
# other bits which are relevant for the initramfs.
for rules in /etc/udev/rules.d/*.rules; do
if [ -e "$rules" ] && [ ! -e "/lib/${rules#/etc/}" ]; then
cp -p $rules $DESTDIR/lib/udev/rules.d/
fi
done
for program in ata_id scsi_id; do
copy_exec /lib/udev/$program /lib/udev
done
copy_exec /sbin/blkid /sbin
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