/usr/share/initramfs-tools/scripts/local-premount/btrfs is in btrfs-progs 4.15.1-1build1.
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 | #!/bin/sh
set -e
PREREQ=""
prereqs()
{
echo "${PREREQ}"
}
case "${1}" in
prereqs)
prereqs
exit 0
;;
esac
if [ -x /bin/btrfs ]
then
modprobe btrfs
# If asked to be quiet, show only errors
[ "${quiet}" = "y" ] && exec >/dev/null
/bin/btrfs device scan
fi
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