/usr/share/initramfs-tools/scripts/local-premount/btrfs is in btrfs-tools 3.12-1.
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 | #!/bin/sh
set -e
PREREQ=""
prereqs()
{
echo "${PREREQ}"
}
case "${1}" in
prereqs)
prereqs
exit 0
;;
esac
if [ -x /sbin/btrfs ]
then
modprobe btrfs
/sbin/btrfs device scan 2> /dev/null
fi
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