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/lib/partman/commit.d/50format_btrfs is in ubiquity 2.10.16.

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The actual contents of the file can be viewed below.

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#!/bin/sh

. /lib/partman/lib/base.sh

enable_swap

for dev in $DEVICES/*; do
	[ -d "$dev" ] || continue
	cd $dev
	partitions=
	open_dialog PARTITIONS
	while { read_line num id size type fs path name; [ "$id" ]; }; do
		[ "$fs" != free ] || continue
		partitions="$partitions $id,$num"
	done
	close_dialog

	for part in $partitions; do
		id=${part%,*}
		num=${part#*,}
		[ -f $id/method -a -f $id/format \
		  -a -f $id/acting_filesystem ] || continue
		filesystem=$(cat $id/acting_filesystem)
		case $filesystem in
		    btrfs)
			if [ -f $id/formatted ] && \
			   [ $id/formatted -nt $id/method ] && \
			   ([ ! -f $id/filesystem ] || \
			    [ $id/formatted -nt $id/filesystem ]); then
				continue
			fi
			log "Try to create file system for $dev/$id"
			if [ -f $id/mountpoint ]; then
				template=partman-basicfilesystems/progress_formatting_mountable
				db_subst $template MOUNT_POINT "$(cat $id/mountpoint)"
			else
				template=partman-basicfilesystems/progress_formatting
			fi
			open_dialog PARTITION_INFO $id
			read_line x1 x2 x3 x4 x5 device x6
			close_dialog

			RET=''
			db_metaget  partman/filesystem_short/"$filesystem" description || RET=''
			[ "$RET" ] || RET="$filesystem"
			db_subst $template TYPE "$RET"
			db_subst $template PARTITION "$num"
			db_subst $template DEVICE $(humandev $(cat device))

			db_progress START 0 3 partman/text/formatting
			db_progress INFO $template
			db_progress SET 1

			label=''
			if [ -f $id/label ]; then
				label=$(cat $id/label | \
					sed 's/\(............\).*/\1/g')
			fi
			code=0
			# Ensure label is quoted correctly
			log-output -t partman --pass-stdout \
				mkfs.btrfs ${label:+-L "$label"} \
					 $device >/dev/null || code=$?
			sync
			db_progress STOP

			if [ "$code" != 0 ]; then
				T=partman-basicfilesystems/create_failed
				db_subst $T FILESYSTEM "$filesystem"
				db_subst $T PARTITION "$num"
				db_subst $T DEVICE $(humandev $(cat device))
				db_input critical $T || true
				db_go || true
				#disable_swap
				exit 1
			fi
			>$id/formatted
			;;
		esac
	done
done

#disable_swap