/usr/share/initramfs-tools/scripts/init-top/udev is in udev 175-0ubuntu9.
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 | #!/bin/sh -e
# initramfs init-top script for udev
PREREQ="all_generic_ide blacklist"
# Output pre-requisites
prereqs()
{
echo "$PREREQ"
}
case "$1" in
prereqs)
prereqs
exit 0
;;
esac
# It's all over netlink now
echo "" > /proc/sys/kernel/hotplug
# Start the udev daemon to process events
/sbin/udevd --daemon --resolve-names=never
# Iterate sysfs and fire off everything; if we include a rule for it then
# it'll get handled; otherwise it'll get handled later when we do this again
# in the main boot sequence.
( /sbin/udevadm trigger --action=add --subsystem-match=block; \
/sbin/udevadm trigger --action=add --subsystem-nomatch=block; ) &
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