/usr/share/initramfs-tools/scripts/init-bottom/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 | #!/bin/sh -e
PREREQS=""
prereqs() { echo "$PREREQS"; }
case "$1" in
prereqs)
prereqs
exit 0
;;
esac
# Stop udevd, we'll miss a few events while we run init, but we catch up
udevadm control --exit
# move the /dev tmpfs to the rootfs; fall back to util-linux mount that does
# not understand -o move
mount -n -o move /dev ${rootmnt}/dev || mount -n --move /dev ${rootmnt}/dev
# create a temporary symlink to the final /dev for other initramfs scripts
if command -v nuke >/dev/null; then
nuke /dev
else
rm -rf /dev
fi
ln -s ${rootmnt}/dev /dev
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