/etc/kernel/postinst.d/initramfs-tools is in initramfs-tools 0.122ubuntu8.
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 | #!/bin/sh -e
version="$1"
bootopt=""
[ -x /usr/sbin/update-initramfs ] || exit 0
# passing the kernel version is required
if [ -z "${version}" ]; then
echo >&2 "W: initramfs-tools: ${DPKG_MAINTSCRIPT_PACKAGE:-kernel package} did not pass a version number"
exit 2
fi
# exit if kernel does not need an initramfs
if [ "$INITRD" = 'No' ]; then
exit 0
fi
# absolute file name of kernel image may be passed as a second argument;
# create the initrd in the same directory
if [ -n "$2" ]; then
bootdir=$(dirname "$2")
bootopt="-b ${bootdir}"
fi
# avoid running multiple times
if [ -n "$DEB_MAINT_PARAMS" ]; then
eval set -- "$DEB_MAINT_PARAMS"
if [ -z "$1" ] || [ "$1" != "configure" ]; then
exit 0
fi
fi
# we're good - create initramfs. update runs do_bootloader
INITRAMFS_TOOLS_KERNEL_HOOK=1 update-initramfs -c -t -k "${version}" ${bootopt} >&2
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