/usr/share/initramfs-tools/hooks/btrfs is in btrfs-tools 4.4-1.
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 | #!/bin/sh
set -e
PREREQ=""
prereqs()
{
echo "${PREREQ}"
}
case "${1}" in
prereqs)
prereqs
exit 0
;;
esac
. /usr/share/initramfs-tools/hook-functions
if [ -x /bin/btrfs ]
then
copy_exec /bin/btrfs /bin
copy_exec /bin/btrfs-zero-log
if [ ! -x /usr/share/initramfs-tools/hooks/fsck ] && [ ! -x /etc/initramfs-tools/hooks/fsck ]
then
copy_exec /bin/fsck.btrfs /bin
fi
fi
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