common/filter.btrfs

# Filters for btrfs command output

. ./common/filter

# Some, but not all, commands emit "Btrfs <version>"
_filter_btrfs_version()
{
	sed -e "s/^[Bb]trfs.*//g"
}

_filter_devid()
{
	sed -e "s/\(devid\)\s\+[0-9]\+/\1 <DEVID>/g"
}

# If passed a number as first arg, filter that number of devices
# If passed a UUID as second arg, filter that exact UUID
_filter_btrfs_filesystem_show()
{
	if [ ! -z $1 ]; then
		NUMDEVS=$1
		NUM_SUBST="<EXACTNUM>"
	else
		NUMDEVS="[0-9]\+"
		NUM_SUBST="<NUM>"
	fi

	UUID=""
	if [ ! -z $2 ]; then
		UUID=$2
	fi

	# the uniq collapses all device lines into 1
	_filter_uuid $UUID | _filter_scratch | _filter_scratch_pool | \
	_filter_size | _filter_btrfs_version | _filter_devid | \
	_filter_zero_size | \
	sed -e "s/\(Total devices\) $NUMDEVS/\1 $NUM_SUBST/g" | \
	uniq
}

# This eliminates all numbers, and shows only unique lines,
# to accomodate a varying nr. of devices.
# If given an argument, make sure we saw that many devices
# in total.
_filter_btrfs_device_stats()
{
	if [ ! -z $1 ]; then
		NUMDEVS=$1
		UNIQ_OPT="-c"
	else
		NUMDEVS="thiswillnotmatch"
		UNIQ_OPT=""
	fi

	_filter_scratch | _filter_scratch_pool | \
	sed -e "s/[0-9]\+$/<NUM>/g" | sort | uniq $UNIQ_OPT | \
	sed -e "s/ *$NUMDEVS /<NUMDEVS> /g"
}

_filter_transaction_commit() {
	sed -e "/Transaction commit: none (default)/d" | \
	sed -e "s/Delete subvolume (.*commit):/Delete subvolume/g"
}

_filter_btrfs_subvol_delete()
{
	_filter_scratch | _filter_transaction_commit
}

_filter_btrfs_compress_property()
{
	sed -e "s/compression=\(lzo\|zlib\|zstd\)/COMPRESSION=XXX/g"
}

# filter error messages from btrfs prop, optionally verify against $1
# recognized message(s):
#  "object is not compatible with property: label"
#  "invalid value for property:{, value}"
#  "failed to {get,set} compression for $PATH[.:]: Invalid argument"
_filter_btrfs_prop_error()
{
	if ! [ -z "$1" ]; then
		sed -e "s#\(compatible with property\): $1#\1#" \
		    -e "s#^\(.*failed to [sg]et compression for $1\)[:.] \(.*\)#\1: \2#"
	else
		sed -e "s#^\(.*compatible with property\).*#\1#" \
		    -e "s#^\(.*invalid value for property\)[:.].*#\1#"
	fi
}

# make sure this script returns success
/bin/true