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|
#!/bin/dash
usage()
{
echo "usage: $0 [--unscan] [btrfs options] <btrfs filesystem> <mountpoint>"
}
get_prop()
{
local prop="$1"
btrfs inspect-internal dump-super "$2" | sed -E -ne "s/^${prop} +//p"
}
device_count()
{
btrfs inspect-internal dump-super "$1" | grep -c '^dev_item.devid '
}
competing_devices()
{
local uuid
uuid=$1
btrfs filesystem show "$uuid" | sed -E -ne 's/^ devid.* //p'
}
remove_competition()
{
competing_devices "$1" | while read dev
do
[ "$dev" = "$source" ] || btrfs device scan -u "$dev" || true
done
}
getend()
{
eval "echo \${$(($#-$1))}"
}
btrfs_mount()
{
[ $# -ge 2 ] || { usage; exit 1; }
destdir=$(getend 0 "$@")
source=$(getend 1 "$@")
[ -e "$source" ]
[ -r "$source" ]
[ -d "$destdir" ]
for args
do
case "$1" in
--unscan) unscan=y;;
*) set -- "$@" "$1";;
esac
shift
done
if [ "$unscan" ]
then
device_count=$(device_count "$source")
if [ $device_count -eq 1 ]
then
source_uuid=$(get_prop fsid "$source")
remove_competition "$source_uuid"
fi
fi
mount "$@"
}
set -e
btrfs_mount "$@"
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