briantully/DiskUtil.sh

## DiskUtil.sh
#!/bin/bash
# by joevt Jan 31, 2021

directbless="/Volumes/Work/Programming/XcodeProjects/bless/bless-204.40.27 joevt/DerivedData/bless/Build/Products/Debug/bless"
alias directbless='"$directbless"'
if [[ ! -f "$directbless" ]]; then
	echo "# Download and build bless from https://github.com/joevt/bless , then update the path of directbless defined in DiskUtil.sh"
	directbless=bless
	alias directbless=bless
fi


# dump disk_label file
dump_label () { local contents; contents=$(xxd -p -c99999 "$1"); echo "${contents:10}" | perl -pe "s/(..)/\1 /g;s/00/../g;s/ //g;s/(.{$((0x${contents:2:4}*2))})/\1\n/g" ; }


# mount a partition
mountpartition() {
	local mounttype=$1
	local slice=$2
	local volume=$3
	local mountpoint=""
	mountpoint=$(mount | sed -n -E "/\/dev\/$slice on (.*) \(.*/s//\1/p")
	if [[ -n "$mountpoint" ]]; then
		echo -n "$mountpoint"
		return 0
	fi
	local i=0
	local startmountpoint="/Volumes/$volume"
	mountpoint="$startmountpoint"
	while ((1)); do
		sudo mkdir "$mountpoint" 2> /dev/null && break
		if ((i++ > 1000)); then
			echo "Could not create mountpoint" 1>&2
			return 1
		fi
		mountpoint="$startmountpoint$i"
	done
	sudo "mount$mounttype" "/dev/$slice" "$mountpoint" && echo -n "$mountpoint"
	return $?
}


makemultilinedisklabel () {
	local folder="$1"
	local lines="$2"
	local alllines=""
	local alllines2x=""
	local tempfolder=""
	tempfolder="$(mktemp -d)"

	IFS=$'\n'
	local linenum=0
	local theline=""
	local theoneline=""
	for theline in $(echo "$lines"); do
		#echo "doing line: \"$theline\""
		#echo sudo bless --folder "$folder" --label "$theline"
		sudo bless --folder "$tempfolder" --label "$theline" 2> /dev/null
		if (( linenum )); then
			alllines+="$(dump_label "$tempfolder/.disk_label" | sed '1,/[^.]/ {/^[.]*$/d; }')"$'\n'
			alllines2x+="$(dump_label "$tempfolder/.disk_label_2x" | sed '1,/[^.]/ {/^[.]*$/d; }')"$'\n'
			theoneline+=" $theline"
		else
			alllines+="$(dump_label "$tempfolder/.disk_label")"$'\n'
			alllines2x+="$(dump_label "$tempfolder/.disk_label_2x")"$'\n'
			theoneline="$theline"
		fi
		((linenum++))
	done

	local suffix=""
	local thelines=""
	for suffix in "" "_2x"; do
		[[ -z $suffix ]] && thelines="$alllines" || thelines="$alllines2x"

		local linewidths=""
		local maxlinewidth=""
		linewidths="$(echo "${thelines}" | tr '0-9a-f' '.' | sort -ur)"
		maxlinewidth=$(echo "$linewidths" | sed -n '1p')
		linewidths=$(echo "$linewidths" | sed '1d')

		local centercommands=""
		local linewidth=""
		for linewidth in $(echo "$linewidths"); do
			local left=${maxlinewidth:0:(${#maxlinewidth}-${#linewidth})/4*2}
			local right=${maxlinewidth:0:(${#maxlinewidth}-${#linewidth}-${#left})}
			centercommands+="s/^(${linewidth})$/$left\1$right/; "
		done
		thelines=$(echo "$thelines" | sed -E "$centercommands s/\./0/g")
		printf "01%04x%04x$thelines" $((${#maxlinewidth} / 2)) "$(echo "$thelines" | wc -l)" | xxd -p -r > "$tempfolder/disk_label$suffix"

		[[ -f "$folder/.disk_label$suffix" ]] && sudo chflags noschg "$folder/.disk_label$suffix"
		sudo cp "$tempfolder/disk_label$suffix" "$folder/.disk_label$suffix"
		sudo chflags schg "$folder/.disk_label$suffix"
		#sudo bless --folder "$folder" --labelfile "$tempfolder/disk_label$suffix"
		#dump_label "$folder/.disk_label$suffix"
	done

	[[ -f "$folder/.disk_label.contentDetails" ]] && sudo chflags noschg "$folder/.disk_label.contentDetails"
	theoneline="${theoneline/🄳/ [D]}"
	theoneline="${theoneline/🄿/ [P]}"
	theoneline="${theoneline/🅁/ [R]}"
	theoneline="${theoneline/🄱/ [B]}"
	theoneline="${theoneline//  / }"
	printf "%s" "$theoneline" > "$tempfolder/disk_label.contentDetails"
	sudo cp "$tempfolder/disk_label.contentDetails" "$folder/.disk_label.contentDetails"
	sudo chflags schg "$folder/.disk_label.contentDetails"
}


unsetall () {
	local thevarprefix="$1" # prefix for variable names
	if [[ -n $thevarprefix ]]; then
		eval "$(set | sed -nE '/^('"$1"'[^=]*)=.*/s//unset \1/p')"
	fi
}


fixapfsbooter () {
	# Use Catalina for best results.

	theoneapfsmountpoint="$1"
	theline1="$2"

	if [[ -z $theoneapfsmountpoint ]]; then
		echo "#Error: missing parameters"
		return 1
	fi

	if [[ -z $theline1 ]]; then
		echo "#Error: missing second parameter"
		return 1
	fi

	local diskutil_fab1_Error=""
	local diskutil_fab1_APFSContainerReference=""
	local diskutil_fab1_APFSVolumeGroupID=""
	local diskutil_fab1_MountPoint=""
	local diskutil_fab1_VolumeUUID=""
	getdiskinfo "$theoneapfsmountpoint" "diskutil_fab1_"
	if [[ -n $diskutil_fab1_Error ]]; then
		echo "# Error: $diskutil_fab1_Error"
		return 1
	fi

	mkdir -p /tmp/disklabeltemp

	local iconsource="$theoneapfsmountpoint/.VolumeIcon.icns"
	if [[ -f "$iconsource" ]]; then
		echo "# Got icon at $iconsource"
		if [[ -L "$iconsource" ]]; then
			echo "# Making icon not a sym link"
			cp -p "$iconsource" /tmp/disklabeltemp
			sudo rm "$iconsource"
			sudo cp -p /tmp/disklabeltemp/.VolumeIcon.icns "$iconsource"
		fi
	else
		echo "# Did not find icon at $iconsource"
	fi

	local Recovery_MountPoint=""

	local patAll="^(_|${diskutil_fab1_APFSVolumeGroupID}_System|${diskutil_fab1_APFSVolumeGroupID}_Data|_Preboot|_Recovery)="
	local patSys="^_="
	local patSys2="^${diskutil_fab1_APFSVolumeGroupID}_System="
	local patData="^${diskutil_fab1_APFSVolumeGroupID}_Data="
	local patPreboot="^_Preboot="
	local patRecovery="^_Recovery="

	local System_UUID="$diskutil_fab1_APFSVolumeGroupID"
	if [[ -z $System_UUID ]]; then
		System_UUID="$diskutil_fab1_VolumeUUID"
	fi

	for thepass in 0 1; do
		for thedisk in $(getapfsroles "$diskutil_fab1_APFSContainerReference"); do
			if [[ $thedisk =~ $patAll ]]; then
				echo "#================"
				echo "# Doing $thedisk, pass $(( thepass+1 ))"

				local thedevice="${thedisk#*=}"
				diskutil mount "$thedevice" > /dev/null 2>&1
				getdiskinfo "$thedevice" "diskutil_fab2_"
				if [[ -z "$diskutil_fab2_MountPoint" ]]; then
					echo "# Could not mount"
				else
					local issource=0

					if [[ "$diskutil_fab2_MountPoint" == "$diskutil_fab1_MountPoint" ]]; then
						issource=1
					fi

					local theletter=""
					local thedest=""

					if [[ $thedisk =~ $patSys ]]; then
						if ((issource)); then
							thedest="$diskutil_fab2_MountPoint/System/Library/CoreServices"
						fi
					elif [[ $thedisk =~ $patSys2 ]]; then
						thedest="$diskutil_fab2_MountPoint/System/Library/CoreServices"
					elif [[ $thedisk =~ $patData ]]; then
						theletter="🄳"
						thedest="$diskutil_fab2_MountPoint/System/Library/CoreServices"
					elif [[ $thedisk =~ $patPreboot ]]; then
						theletter="🄿"
						thedest="$diskutil_fab2_MountPoint/$System_UUID/System/Library/CoreServices"
						if [[ ! -d $thedest ]]; then
							thedest="$diskutil_fab2_MountPoint/$diskutil_fab1_VolumeUUID/System/Library/CoreServices"
						fi
					elif [[ $thedisk =~ $patRecovery ]]; then
						theletter="🅁"
						thedest="$diskutil_fab2_MountPoint/$System_UUID"
						if [[ ! -d $thedest ]]; then
							thedest="$diskutil_fab2_MountPoint/$diskutil_fab1_VolumeUUID"
						fi
						Recovery_MountPoint="$diskutil_fab2_MountPoint"
					fi

					if ((thepass == 0)); then
						if ((issource)); then
							echo "# Skipping icon copy"
						elif [[ -f "$iconsource" ]]; then
							echo "# Doing icon copy"
							sudo cp "$iconsource" "$diskutil_fab2_MountPoint" || echo "# Error copying icon"
						else
							echo "# No icon to copy"
						fi
					fi

					if [[ -d $thedest ]]; then
						echo "# Destination at $thedest"

						if ((thepass == 0)); then
							local version=""
							local theversionfile="$thedest/SystemVersion.plist"
							if [[ -f "$theversionfile" ]]; then
								version=$(/usr/libexec/PlistBuddy -c 'Print :ProductVersion' "$theversionfile")
							fi

							local theline2=""
							if [[ -n "$version" ]]; then
								theline2="${version}${theletter}"
							else
								theline2="${theletter}"
							fi

							makemultilinedisklabel "/tmp/disklabeltemp" "${theline1}"$'\n'"${theline2}"

							echo "# Setting the label to: [${theline1}][${theline2}]"
							sudo find "$thedest" -name '.disk_label*' -exec chflags noschg {} \;
							sudo cp /tmp/disklabeltemp/.disk_label* "$thedest"
							sudo find "$thedest" -name '.disk_label*' -exec chflags schg {} \;
						else
							if [[ -f "$thedest/boot.efi" ]]; then
								echo "# Blessing $thedest/boot.efi"
								if [[ -f "$directbless" ]]; then
									sudo "$directbless" --folder "$thedest" --file "$thedest/boot.efi"
								else
									if [[ -z $theletter ]]; then
										# Blessing the system volume will bless Preboot, so temporarily change it to Recovery
										# but first must change Recovery to none. This only works in Catalina
										diskutil apfs changeVolumeRole "$Recovery_MountPoint" clear || echo "# ERROR: Unexpected error attempting to change role of Recovery volume"
										diskutil apfs changeVolumeRole "$diskutil_fab2_MountPoint" R || echo "# ERROR: Retry this from a different macOS Catalina system"
									fi
									sudo bless --folder "$thedest" --file "$thedest/boot.efi"
									if [[ -z $theletter ]]; then
										diskutil apfs changeVolumeRole "$diskutil_fab2_MountPoint" clear || echo "# ERROR: Retry this from a different macOS Catalina system"
										diskutil apfs changeVolumeRole "$Recovery_MountPoint" R || echo "# ERROR: Unexpected error attempting to change role of Recovery volume"
									fi
								fi
							fi
						fi
					else
						echo "# Destination does not exist $thedest"
					fi
				fi # if mount
			fi # if the disk
		done # for thedisk
	done # for thepass
	echo "#================"
	echo "# Done!"
}


getvolumeproperty () {
	local slice="$1"
	local property="$2"
	eval "$(diskutil info -plist "$slice" | plutil -p - | sed -nE '/^ *"'"$property"'" => (.*)/s//echo \1/p')"
}


getvolumename () {
	getvolumeproperty "$1" "VolumeName"
}


mountEFIpartitions () {
	IFS=$'\n'
	local diskinfo=""
	for diskinfo in $(diskutil list | LANG=C sed -nE $'/^ *[0-9]+: +EFI (\xe2\x81\xa8)?(.*[^ \xa9])(\xe2\x81\xa9)? +[0-9.]+ [^ ]?B +(disk[0-9]+s[0-9]+)$/''s//\2_\4/p'); do
		local slice="${diskinfo##*_}"
		local volume=""
		volume="$(getvolumename "$slice")"
		mountpartition "_msdos" "$slice" "$volume" > /dev/null
	done
}


mountRecoveryHDpartitions() {
	IFS=$'\n'
	for diskinfo in $(diskutil list | LANG=C sed -nE $'/^ *[0-9]+: +Apple_Boot (\xe2\x81\xa8)?(Recovery HD)(\xe2\x81\xa9)? +[0-9.]+ [^ ]?B +(disk[0-9]+s[0-9]+)$/''s//\2_\4/p'); do
		local slice="${diskinfo##*_}"
		local volume=""
		volume="$(getvolumename "$slice")"
		mountpartition "_hfs" "$slice" "$volume" > /dev/null
	done
}


mountRecoveryPartitions() {
	IFS=$'\n'
	for diskinfo in $(diskutil list | LANG=C sed -nE $'/^ *[0-9]+: +APFS Volume (\xe2\x81\xa8)?(Recovery)(\xe2\x81\xa9)? +[0-9.]+ [^ ]?B +(disk[0-9]+s[0-9]+)$/''s//\2_\4/p'); do
		local slice="${diskinfo##*_}"
		local volume=""
		volume="$(getvolumename "$slice")"
		mountpartition "_apfs" "$slice" "$volume" > /dev/null
	done
}


mountPrebootPartitions() {
	IFS=$'\n'
	for diskinfo in $(diskutil list | LANG=C sed -nE $'/^ *[0-9]+: +APFS Volume (\xe2\x81\xa8)?(Preboot)(\xe2\x81\xa9)? +[0-9.]+ [^ ]?B +(disk[0-9]+s[0-9]+)$/''s//\2_\4/p'); do
		local slice="${diskinfo##*_}"
		local volume=""
		volume="$(getvolumename "$slice")"
		mountpartition "_apfs" "$slice" "$volume" > /dev/null
	done
}


getblessinfo () {
	local mountpoint="$1"
	local thevarprefix="$2"
	unsetall "$thevarprefix"
	eval "$(directbless -plist --info "$mountpoint" | plutil -convert json -o - - | perl -e '
		use JSON::PP; my $f = decode_json (<>)->{"Finder Info"};
		printf("'"$thevarprefix"'theblessfolder=\"%s\"\n'"$thevarprefix"'theblessfile=\"%s\"\n'"$thevarprefix"'theblessopen=\"%s\"\n", $f->[0]->{"Path"}, $f->[1]->{"Path"}, $f->[2]->{"Path"})')"
}


dumpAllDiskLabels () {
	IFS=$'\n'
	for theslice in $(diskutil list | sed -nE '/.*(disk[0-9]+s[0-9]+)$/s//\1/p'); do
		#echo "$theslice"
		sudo diskutil mount "$theslice" > /dev/null 2>&1
		local diskutil_dadl_DeviceIdentifier=""
		getdiskinfo "$theslice" "diskutil_dadl_"
		if [[ -n "$diskutil_dadl_MountPoint" ]]; then
			echo "#==========="
			echo "$diskutil_dadl_DeviceIdentifier $diskutil_dadl_MountPoint"
			local theblessfolder=""
			local theblessfile=""
			local theblessopen=""
			getblessinfo "$diskutil_dadl_MountPoint"
			if [[ -n $theblessfile ]]; then
				theblessfolder="$(dirname "$theblessfile")"
			fi

			for thefolder in $( { find "$diskutil_dadl_MountPoint" -maxdepth 2 -name "boot.efi" 2> /dev/null | sed -E '/\/boot.efi$/s///'; ls -d "$diskutil_dadl_MountPoint/"*"/System/Library/CoreServices"; ls -d "$theblessfolder" "$diskutil_dadl_MountPoint/System/Library/CoreServices" "$diskutil_dadl_MountPoint/EFI/BOOT" ; } 2> /dev/null | sort -u ); do
				local version=""
				local theversionfile="$thefolder/SystemVersion.plist"
				if [[ -f "$theversionfile" ]]; then
					version=$(/usr/libexec/PlistBuddy -c 'Print :ProductVersion' "$theversionfile")
				fi

				echo "${thefolder} ($version)"
				[[ -f $thefolder/.disk_label.contentDetails ]] && echo "contentDetails: $(cat "$thefolder/.disk_label.contentDetails")" || echo "    missing .disk_label.contentDetails"
				[[ -f $thefolder/.disk_label_2x ]] && dump_label "$thefolder/.disk_label_2x" || echo "    missing .disk_label_2x"
				[[ -f $thefolder/.disk_label ]] && dump_label "$thefolder/.disk_label" || echo "    missing .disk_label"
			done
		fi
	done
}


makeLabelCommands () {
	# Partitions need to be mounted first.

	# Only includes Apple_HFS and Apple_Boot partitions.
	IFS=$'\n'
	local thefolder=""
	for diskinfo in $(diskutil list | LANG=C sed -nE $'/^ *[0-9]+: +Apple_[HFSBoot]* (\xe2\x81\xa8)?([^ ].*[^ \xa9])(\xe2\x81\xa9)? +[0-9.]+ [^ ]?B +(disk[0-9]+s[0-9]+)$/''s//\2_\4/p'); do
		local slice="${diskinfo##*_}"
		local volume=""
		volume="$(getvolumename "$slice")"
		local version=""
		local mountpoint=""
		mountpoint=$(mountpartition "_hfs" "$slice" "$volume")
		local theblessfolder=""
		local theblessfile=""
		local theblessopen=""
		getblessinfo "$mountpoint"
		if [[ -n $theblessfile ]]; then
			thefolder="$(dirname "$theblessfile")"
			if [[ "$thefolder" != /Volumes/*/System/Library/CoreServices ]]; then
				local theversionfile="$thefolder/SystemVersion.plist"
				if [[ -f "$theversionfile" ]]; then
					version=$(/usr/libexec/PlistBuddy -c 'Print :ProductVersion' "$theversionfile")
				fi
				printf 'makemultilinedisklabel "%s" "%s"$%c\\n%c"%s"\n' "$thefolder" "${volume/Recovery HD/Recovery}" "'" "'" "$version"
			fi
		fi
	done

	# Scan the usual places first
	IFS=$'\n'
	for thefolder in $(find /Volumes/*/System/Library/CoreServices /Volumes/*/EFI/BOOT -maxdepth 0); do
		local volume=""
		local version=""
		volume="${thefolder/\/System\/Library\/CoreServices/}"
		volume="${volume/\/EFI\/BOOT/}"
		volume="$(getvolumename "$volume")"
		local theversionfile="$thefolder/SystemVersion.plist"
		if [[ -f "$theversionfile" ]]; then
			version=$(/usr/libexec/PlistBuddy -c 'Print :ProductVersion' "$theversionfile")
		fi
		printf 'makemultilinedisklabel "%s" "%s"$%c\\n%c"%s"\n' "$thefolder" "${volume/Recovery HD/Recovery}" "'" "'" "$version"
	done
}


clearOpenFolders () {
	# Clear open folder list of hfs partitions (finderinfo[2] in bless --info).
	# If you have an HFS+ disk that has folders that open when you mount them (such as an installer), then this will stop that from happening.
	IFS=$'\n'
	for diskinfo in $(diskutil list | LANG=C sed -nE $'/^ *[0-9]+: +Apple_HFS (\xe2\x81\xa8)?(.*[^ \xa9])(\xe2\x81\xa9)? +[0-9.]+ [^ ]?B +(disk[0-9]+s[0-9]+)$/''s//\2_\4/p'); do
		local slice="${diskinfo##*_}"
		local volume=""
		volume="$(getvolumename "$slice")"
		local mountpoint=""
		mountpoint=$(mountpartition "_hfs" "$slice" "$volume")
		echo "#$slice=$mountpoint,$volume ($version)"
		local theblessfolder=""
		local theblessfile=""
		local theblessopen=""
		getblessinfo "$mountpoint"
		if [[ -n $theblessopen ]]; then
			echo "Clearing open folder list"
			sudo "$directbless" --folder "$theblessfolder" --file "$theblessfile"
		fi
	done
}


getdiskinfo () {
	local thedisk="$1" # the disk you want info for (either a mountpoint like "/" or a device "disk0s1")
	local thevarprefix="$2" # prefix for variable names
	# note: if thevarprefix is empty then you should clear any variables you want to use from this result beforehand
	unsetall "$thevarprefix"
	eval "$(showdiskinfo "$thedisk" "$thevarprefix")"
}


showdiskinfo () {
	local thedisk="$1" # the disk you want info for (either a mountpoint like "/" or a device "disk0s1")
	local thevarprefix="$2" # prefix for variable names
	diskutil info -plist "$thedisk" | plutil -p - | perl -nE 'if (s/ *"([^"]+)" => "?(.*?)"?$/'"$thevarprefix"'\1=\2/) { s/"/\\"/g; s/([^=]+=)(.*)/\1"\2"/; print $_ }'
}


getapfsroles () {
	# $1 = the apfs container
	local patVolumeGroup="^(Data|System)="
	for theapfsvolume in $(
			diskutil apfs list -plist "$1" | plutil -convert json -o - - | perl -e '
				use JSON::PP; my $apfs = decode_json (<>);
				foreach my $volume (@{$apfs->{Containers}[0]{Volumes}}) {print $volume->{Roles}[0] . "=" . $volume->{DeviceIdentifier} . "\n";}
			'
		); do
		diskutil_role_APFSVolumeGroupID=""
		if [[ $theapfsvolume =~ $patVolumeGroup ]]; then
			getdiskinfo "${theapfsvolume#*=}" "diskutil_role_"
		fi
		echo "${diskutil_role_APFSVolumeGroupID}_${theapfsvolume}"
	done
}


setbootername () {
	local thedisk="$1"
	local NewBooterName="$2"

	local diskutil_sbn_Root_BooterDeviceIdentifier=""
	getdiskinfo "$thedisk" diskutil_sbn_Root_
	if [[ -n $diskutil_sbn_Root_BooterDeviceIdentifier ]]; then
		diskutil mount "$diskutil_sbn_Root_BooterDeviceIdentifier"
		local diskutil_sbn_Root_VolumeUUID=""
		local diskutil_sbn_Root_APFSVolumeGroupID=""
		getdiskinfo "$diskutil_sbn_Root_BooterDeviceIdentifier" "diskutil_sbn_Preboot_"
		if [[ -n $diskutil_sbn_Preboot_MountPoint ]]; then
			local theUUID=""
			if [[ -d $diskutil_sbn_Preboot_MountPoint/$diskutil_sbn_Root_VolumeUUID ]]; then
				theUUID=$diskutil_sbn_Root_VolumeUUID
				echo "using VolumeUUID"
			elif [[ -d $diskutil_sbn_Preboot_MountPoint/$diskutil_sbn_Root_APFSVolumeGroupID ]]; then
				theUUID=$diskutil_sbn_Root_APFSVolumeGroupID
				echo "using APFSVolumeGroupID"
			else
				echo "unknown UUID in booter"
				ls -l "$diskutil_sbn_Preboot_MountPoint"
				return 1
			fi
			local thefile="$diskutil_sbn_Preboot_MountPoint/$theUUID/System/Library/CoreServices/.disk_label.contentDetails"
			if [[ -f "$thefile" ]]; then
				echo "$thefile already exists: $(cat "$thefile")"
			else
				sudo bash -c "echo \"$NewBooterName\" > \"$thefile\""
				echo "$thefile is created"
			fi
		else
			echo "$diskutil_sbn_Root_BooterDeviceIdentifier is not mounted"
		fi
	else
		echo "No booter device"
	fi
}


doperlonmounteddisks () {
	diskutil list -plist | plutil -convert json -o - - | perl -e '
		use JSON::PP; my $disks = decode_json (<>)->{AllDisksAndPartitions};
		foreach my $disk (@$disks) {
			foreach my $type ("APFSVolumes","Partitions") {
				foreach my $part (@{$disk->{$type}}) {
					if (exists $part->{MountPoint}) {
						'"$1"'
					}
				}
			}
		}
	'
}


getallmounteddisks () {
	# not all disks are mounted at /Volumes so use diskutil to find them
	if [[ "$1" == "-d" ]]; then
		doperlonmounteddisks 'print $part->{DeviceIdentifier} . ":" . $part->{MountPoint} . "\n";'
	else
		doperlonmounteddisks 'print $part->{MountPoint} . "\n";'
	fi
}


fixcustomiconflag () {
	local thefolder="$1"
	# if the folder is a mount point then the icon should be in datafork of ".VolumeIcon.icns"
	# otherwise the icon should be in a icns resource in "Icon\n"
	local thefinderinfo=""
	local newfinderinfo=""
	thefinderinfo=$(xattr -px com.apple.FinderInfo "$thefolder" 2> /dev/null | xxd -p -r | xxd -p -c 32)
	if [[ -z "$thefinderinfo" ]]; then
		newfinderinfo="0000000000000000040000000000000000000000000000000000000000000000"
		echo "#  creating FinderInfo $newfinderinfo $thefolder"
	else
		newfinderinfo=${thefinderinfo:0:17}$(printf "%x" $((${thefinderinfo:17:1} | 4)) )${thefinderinfo:18}
		if [[ "$newfinderinfo" != "$thefinderinfo" ]]; then
			echo "# modifying FinderInfo $newfinderinfo $thefolder"
		else
			echo "# unchanged FinderInfo $newfinderinfo $thefolder"
		fi
	fi

	if [[ "$newfinderinfo" != "$thefinderinfo" ]]; then
		xattr -wx com.apple.FinderInfo "$newfinderinfo" "$thefolder"
	fi
}


fixcustomiconflagofallvolumes () {
	IFS=$'\n'
	for themount in $(getallmounteddisks); do
		if [[ -f "$themount/.VolumeIcon.icns" ]]; then
			fixcustomiconflag "$themount"
		fi
	done
}
	#!/bin/bash
	# by joevt Jan 31, 2021

	directbless="/Volumes/Work/Programming/XcodeProjects/bless/bless-204.40.27 joevt/DerivedData/bless/Build/Products/Debug/bless"
	alias directbless='"$directbless"'
	if [[ ! -f "$directbless" ]]; then
	echo "# Download and build bless from https://github.com/joevt/bless , then update the path of directbless defined in DiskUtil.sh"
	directbless=bless
	alias directbless=bless
	fi


	# dump disk_label file
	dump_label () { local contents; contents=$(xxd -p -c99999 "$1"); echo "${contents:10}" \| perl -pe "s/(..)/\1 /g;s/00/../g;s/ //g;s/(.{$((0x${contents:2:4}*2))})/\1\n/g" ; }


	# mount a partition
	mountpartition() {
	local mounttype=$1
	local slice=$2
	local volume=$3
	local mountpoint=""
	mountpoint=$(mount \| sed -n -E "/\/dev\/$slice on (.) \(./s//\1/p")
	if [[ -n "$mountpoint" ]]; then
	echo -n "$mountpoint"
	return 0
	fi
	local i=0
	local startmountpoint="/Volumes/$volume"
	mountpoint="$startmountpoint"
	while ((1)); do
	sudo mkdir "$mountpoint" 2> /dev/null && break
	if ((i++ > 1000)); then
	echo "Could not create mountpoint" 1>&2
	return 1
	fi
	mountpoint="$startmountpoint$i"
	done
	sudo "mount$mounttype" "/dev/$slice" "$mountpoint" && echo -n "$mountpoint"
	return $?
	}


	makemultilinedisklabel () {
	local folder="$1"
	local lines="$2"
	local alllines=""
	local alllines2x=""
	local tempfolder=""
	tempfolder="$(mktemp -d)"

	IFS=$'\n'
	local linenum=0
	local theline=""
	local theoneline=""
	for theline in $(echo "$lines"); do
	#echo "doing line: \"$theline\""
	#echo sudo bless --folder "$folder" --label "$theline"
	sudo bless --folder "$tempfolder" --label "$theline" 2> /dev/null
	if (( linenum )); then
	alllines+="$(dump_label "$tempfolder/.disk_label" \| sed '1,/[^.]/ {/^[.]*$/d; }')"$'\n'
	alllines2x+="$(dump_label "$tempfolder/.disk_label_2x" \| sed '1,/[^.]/ {/^[.]*$/d; }')"$'\n'
	theoneline+=" $theline"
	else
	alllines+="$(dump_label "$tempfolder/.disk_label")"$'\n'
	alllines2x+="$(dump_label "$tempfolder/.disk_label_2x")"$'\n'
	theoneline="$theline"
	fi
	((linenum++))
	done

	local suffix=""
	local thelines=""
	for suffix in "" "_2x"; do
	[[ -z $suffix ]] && thelines="$alllines" \|\| thelines="$alllines2x"

	local linewidths=""
	local maxlinewidth=""
	linewidths="$(echo "${thelines}" \| tr '0-9a-f' '.' \| sort -ur)"
	maxlinewidth=$(echo "$linewidths" \| sed -n '1p')
	linewidths=$(echo "$linewidths" \| sed '1d')

	local centercommands=""
	local linewidth=""
	for linewidth in $(echo "$linewidths"); do
	local left=${maxlinewidth:0:(${#maxlinewidth}-${#linewidth})/4*2}
	local right=${maxlinewidth:0:(${#maxlinewidth}-${#linewidth}-${#left})}
	centercommands+="s/^(${linewidth})$/$left\1$right/; "
	done
	thelines=$(echo "$thelines" \| sed -E "$centercommands s/\./0/g")
	printf "01%04x%04x$thelines" $((${#maxlinewidth} / 2)) "$(echo "$thelines" \| wc -l)" \| xxd -p -r > "$tempfolder/disk_label$suffix"

	[[ -f "$folder/.disk_label$suffix" ]] && sudo chflags noschg "$folder/.disk_label$suffix"
	sudo cp "$tempfolder/disk_label$suffix" "$folder/.disk_label$suffix"
	sudo chflags schg "$folder/.disk_label$suffix"
	#sudo bless --folder "$folder" --labelfile "$tempfolder/disk_label$suffix"
	#dump_label "$folder/.disk_label$suffix"
	done

	[[ -f "$folder/.disk_label.contentDetails" ]] && sudo chflags noschg "$folder/.disk_label.contentDetails"
	theoneline="${theoneline/🄳/ [D]}"
	theoneline="${theoneline/🄿/ [P]}"
	theoneline="${theoneline/🅁/ [R]}"
	theoneline="${theoneline/🄱/ [B]}"
	theoneline="${theoneline// / }"
	printf "%s" "$theoneline" > "$tempfolder/disk_label.contentDetails"
	sudo cp "$tempfolder/disk_label.contentDetails" "$folder/.disk_label.contentDetails"
	sudo chflags schg "$folder/.disk_label.contentDetails"
	}


	unsetall () {
	local thevarprefix="$1" # prefix for variable names
	if [[ -n $thevarprefix ]]; then
	eval "$(set \| sed -nE '/^('"$1"'[^=])=./s//unset \1/p')"
	fi
	}


	fixapfsbooter () {
	# Use Catalina for best results.

	theoneapfsmountpoint="$1"
	theline1="$2"

	if [[ -z $theoneapfsmountpoint ]]; then
	echo "#Error: missing parameters"
	return 1
	fi

	if [[ -z $theline1 ]]; then
	echo "#Error: missing second parameter"
	return 1
	fi

	local diskutil_fab1_Error=""
	local diskutil_fab1_APFSContainerReference=""
	local diskutil_fab1_APFSVolumeGroupID=""
	local diskutil_fab1_MountPoint=""
	local diskutil_fab1_VolumeUUID=""
	getdiskinfo "$theoneapfsmountpoint" "diskutil_fab1_"
	if [[ -n $diskutil_fab1_Error ]]; then
	echo "# Error: $diskutil_fab1_Error"
	return 1
	fi

	mkdir -p /tmp/disklabeltemp

	local iconsource="$theoneapfsmountpoint/.VolumeIcon.icns"
	if [[ -f "$iconsource" ]]; then
	echo "# Got icon at $iconsource"
	if [[ -L "$iconsource" ]]; then
	echo "# Making icon not a sym link"
	cp -p "$iconsource" /tmp/disklabeltemp
	sudo rm "$iconsource"
	sudo cp -p /tmp/disklabeltemp/.VolumeIcon.icns "$iconsource"
	fi
	else
	echo "# Did not find icon at $iconsource"
	fi

	local Recovery_MountPoint=""

	local patAll="^(_\|${diskutil_fab1_APFSVolumeGroupID}_System\|${diskutil_fab1_APFSVolumeGroupID}_Data\|_Preboot\|_Recovery)="
	local patSys="^_="
	local patSys2="^${diskutil_fab1_APFSVolumeGroupID}_System="
	local patData="^${diskutil_fab1_APFSVolumeGroupID}_Data="
	local patPreboot="^_Preboot="
	local patRecovery="^_Recovery="

	local System_UUID="$diskutil_fab1_APFSVolumeGroupID"
	if [[ -z $System_UUID ]]; then
	System_UUID="$diskutil_fab1_VolumeUUID"
	fi

	for thepass in 0 1; do
	for thedisk in $(getapfsroles "$diskutil_fab1_APFSContainerReference"); do
	if [[ $thedisk =~ $patAll ]]; then
	echo "#================"
	echo "# Doing $thedisk, pass $(( thepass+1 ))"

	local thedevice="${thedisk#*=}"
	diskutil mount "$thedevice" > /dev/null 2>&1
	getdiskinfo "$thedevice" "diskutil_fab2_"
	if [[ -z "$diskutil_fab2_MountPoint" ]]; then
	echo "# Could not mount"
	else
	local issource=0

	if [[ "$diskutil_fab2_MountPoint" == "$diskutil_fab1_MountPoint" ]]; then
	issource=1
	fi

	local theletter=""
	local thedest=""

	if [[ $thedisk =~ $patSys ]]; then
	if ((issource)); then
	thedest="$diskutil_fab2_MountPoint/System/Library/CoreServices"
	fi
	elif [[ $thedisk =~ $patSys2 ]]; then
	thedest="$diskutil_fab2_MountPoint/System/Library/CoreServices"
	elif [[ $thedisk =~ $patData ]]; then
	theletter="🄳"
	thedest="$diskutil_fab2_MountPoint/System/Library/CoreServices"
	elif [[ $thedisk =~ $patPreboot ]]; then
	theletter="🄿"
	thedest="$diskutil_fab2_MountPoint/$System_UUID/System/Library/CoreServices"
	if [[ ! -d $thedest ]]; then
	thedest="$diskutil_fab2_MountPoint/$diskutil_fab1_VolumeUUID/System/Library/CoreServices"
	fi
	elif [[ $thedisk =~ $patRecovery ]]; then
	theletter="🅁"
	thedest="$diskutil_fab2_MountPoint/$System_UUID"
	if [[ ! -d $thedest ]]; then
	thedest="$diskutil_fab2_MountPoint/$diskutil_fab1_VolumeUUID"
	fi
	Recovery_MountPoint="$diskutil_fab2_MountPoint"
	fi

	if ((thepass == 0)); then
	if ((issource)); then
	echo "# Skipping icon copy"
	elif [[ -f "$iconsource" ]]; then
	echo "# Doing icon copy"
	sudo cp "$iconsource" "$diskutil_fab2_MountPoint" \|\| echo "# Error copying icon"
	else
	echo "# No icon to copy"
	fi
	fi

	if [[ -d $thedest ]]; then
	echo "# Destination at $thedest"

	if ((thepass == 0)); then
	local version=""
	local theversionfile="$thedest/SystemVersion.plist"
	if [[ -f "$theversionfile" ]]; then
	version=$(/usr/libexec/PlistBuddy -c 'Print :ProductVersion' "$theversionfile")
	fi

	local theline2=""
	if [[ -n "$version" ]]; then
	theline2="${version}${theletter}"
	else
	theline2="${theletter}"
	fi

	makemultilinedisklabel "/tmp/disklabeltemp" "${theline1}"$'\n'"${theline2}"

	echo "# Setting the label to: [${theline1}][${theline2}]"
	sudo find "$thedest" -name '.disk_label*' -exec chflags noschg {} \;
	sudo cp /tmp/disklabeltemp/.disk_label* "$thedest"
	sudo find "$thedest" -name '.disk_label*' -exec chflags schg {} \;
	else
	if [[ -f "$thedest/boot.efi" ]]; then
	echo "# Blessing $thedest/boot.efi"
	if [[ -f "$directbless" ]]; then
	sudo "$directbless" --folder "$thedest" --file "$thedest/boot.efi"
	else
	if [[ -z $theletter ]]; then
	# Blessing the system volume will bless Preboot, so temporarily change it to Recovery
	# but first must change Recovery to none. This only works in Catalina
	diskutil apfs changeVolumeRole "$Recovery_MountPoint" clear \|\| echo "# ERROR: Unexpected error attempting to change role of Recovery volume"
	diskutil apfs changeVolumeRole "$diskutil_fab2_MountPoint" R \|\| echo "# ERROR: Retry this from a different macOS Catalina system"
	fi
	sudo bless --folder "$thedest" --file "$thedest/boot.efi"
	if [[ -z $theletter ]]; then
	diskutil apfs changeVolumeRole "$diskutil_fab2_MountPoint" clear \|\| echo "# ERROR: Retry this from a different macOS Catalina system"
	diskutil apfs changeVolumeRole "$Recovery_MountPoint" R \|\| echo "# ERROR: Unexpected error attempting to change role of Recovery volume"
	fi
	fi
	fi
	fi
	else
	echo "# Destination does not exist $thedest"
	fi
	fi # if mount
	fi # if the disk
	done # for thedisk
	done # for thepass
	echo "#================"
	echo "# Done!"
	}


	getvolumeproperty () {
	local slice="$1"
	local property="$2"
	eval "$(diskutil info -plist "$slice" \| plutil -p - \| sed -nE '/^ "'"$property"'" => (.)/s//echo \1/p')"
	}


	getvolumename () {
	getvolumeproperty "$1" "VolumeName"
	}


	mountEFIpartitions () {
	IFS=$'\n'
	local diskinfo=""
	for diskinfo in $(diskutil list \| LANG=C sed -nE $'/^ [0-9]+: +EFI (\xe2\x81\xa8)?(.[^ \xa9])(\xe2\x81\xa9)? +[0-9.]+ [^ ]?B +(disk[0-9]+s[0-9]+)$/''s//\2_\4/p'); do
	local slice="${diskinfo##*_}"
	local volume=""
	volume="$(getvolumename "$slice")"
	mountpartition "_msdos" "$slice" "$volume" > /dev/null
	done
	}


	mountRecoveryHDpartitions() {
	IFS=$'\n'
	for diskinfo in $(diskutil list \| LANG=C sed -nE $'/^ *[0-9]+: +Apple_Boot (\xe2\x81\xa8)?(Recovery HD)(\xe2\x81\xa9)? +[0-9.]+ [^ ]?B +(disk[0-9]+s[0-9]+)$/''s//\2_\4/p'); do
	local slice="${diskinfo##*_}"
	local volume=""
	volume="$(getvolumename "$slice")"
	mountpartition "_hfs" "$slice" "$volume" > /dev/null
	done
	}


	mountRecoveryPartitions() {
	IFS=$'\n'
	for diskinfo in $(diskutil list \| LANG=C sed -nE $'/^ *[0-9]+: +APFS Volume (\xe2\x81\xa8)?(Recovery)(\xe2\x81\xa9)? +[0-9.]+ [^ ]?B +(disk[0-9]+s[0-9]+)$/''s//\2_\4/p'); do
	local slice="${diskinfo##*_}"
	local volume=""
	volume="$(getvolumename "$slice")"
	mountpartition "_apfs" "$slice" "$volume" > /dev/null
	done
	}


	mountPrebootPartitions() {
	IFS=$'\n'
	for diskinfo in $(diskutil list \| LANG=C sed -nE $'/^ *[0-9]+: +APFS Volume (\xe2\x81\xa8)?(Preboot)(\xe2\x81\xa9)? +[0-9.]+ [^ ]?B +(disk[0-9]+s[0-9]+)$/''s//\2_\4/p'); do
	local slice="${diskinfo##*_}"
	local volume=""
	volume="$(getvolumename "$slice")"
	mountpartition "_apfs" "$slice" "$volume" > /dev/null
	done
	}


	getblessinfo () {
	local mountpoint="$1"
	local thevarprefix="$2"
	unsetall "$thevarprefix"
	eval "$(directbless -plist --info "$mountpoint" \| plutil -convert json -o - - \| perl -e '
	use JSON::PP; my $f = decode_json (<>)->{"Finder Info"};
	printf("'"$thevarprefix"'theblessfolder=\"%s\"\n'"$thevarprefix"'theblessfile=\"%s\"\n'"$thevarprefix"'theblessopen=\"%s\"\n", $f->[0]->{"Path"}, $f->[1]->{"Path"}, $f->[2]->{"Path"})')"
	}


	dumpAllDiskLabels () {
	IFS=$'\n'
	for theslice in $(diskutil list \| sed -nE '/.*(disk[0-9]+s[0-9]+)$/s//\1/p'); do
	#echo "$theslice"
	sudo diskutil mount "$theslice" > /dev/null 2>&1
	local diskutil_dadl_DeviceIdentifier=""
	getdiskinfo "$theslice" "diskutil_dadl_"
	if [[ -n "$diskutil_dadl_MountPoint" ]]; then
	echo "#==========="
	echo "$diskutil_dadl_DeviceIdentifier $diskutil_dadl_MountPoint"
	local theblessfolder=""
	local theblessfile=""
	local theblessopen=""
	getblessinfo "$diskutil_dadl_MountPoint"
	if [[ -n $theblessfile ]]; then
	theblessfolder="$(dirname "$theblessfile")"
	fi

	for thefolder in $( { find "$diskutil_dadl_MountPoint" -maxdepth 2 -name "boot.efi" 2> /dev/null \| sed -E '/\/boot.efi$/s///'; ls -d "$diskutil_dadl_MountPoint/"*"/System/Library/CoreServices"; ls -d "$theblessfolder" "$diskutil_dadl_MountPoint/System/Library/CoreServices" "$diskutil_dadl_MountPoint/EFI/BOOT" ; } 2> /dev/null \| sort -u ); do
	local version=""
	local theversionfile="$thefolder/SystemVersion.plist"
	if [[ -f "$theversionfile" ]]; then
	version=$(/usr/libexec/PlistBuddy -c 'Print :ProductVersion' "$theversionfile")
	fi

	echo "${thefolder} ($version)"
	[[ -f $thefolder/.disk_label.contentDetails ]] && echo "contentDetails: $(cat "$thefolder/.disk_label.contentDetails")" \|\| echo " missing .disk_label.contentDetails"
	[[ -f $thefolder/.disk_label_2x ]] && dump_label "$thefolder/.disk_label_2x" \|\| echo " missing .disk_label_2x"
	[[ -f $thefolder/.disk_label ]] && dump_label "$thefolder/.disk_label" \|\| echo " missing .disk_label"
	done
	fi
	done
	}


	makeLabelCommands () {
	# Partitions need to be mounted first.

	# Only includes Apple_HFS and Apple_Boot partitions.
	IFS=$'\n'
	local thefolder=""
	for diskinfo in $(diskutil list \| LANG=C sed -nE $'/^ [0-9]+: +Apple_[HFSBoot] (\xe2\x81\xa8)?([^ ].*[^ \xa9])(\xe2\x81\xa9)? +[0-9.]+ [^ ]?B +(disk[0-9]+s[0-9]+)$/''s//\2_\4/p'); do
	local slice="${diskinfo##*_}"
	local volume=""
	volume="$(getvolumename "$slice")"
	local version=""
	local mountpoint=""
	mountpoint=$(mountpartition "_hfs" "$slice" "$volume")
	local theblessfolder=""
	local theblessfile=""
	local theblessopen=""
	getblessinfo "$mountpoint"
	if [[ -n $theblessfile ]]; then
	thefolder="$(dirname "$theblessfile")"
	if [[ "$thefolder" != /Volumes/*/System/Library/CoreServices ]]; then
	local theversionfile="$thefolder/SystemVersion.plist"
	if [[ -f "$theversionfile" ]]; then
	version=$(/usr/libexec/PlistBuddy -c 'Print :ProductVersion' "$theversionfile")
	fi
	printf 'makemultilinedisklabel "%s" "%s"$%c\\n%c"%s"\n' "$thefolder" "${volume/Recovery HD/Recovery}" "'" "'" "$version"
	fi
	fi
	done

	# Scan the usual places first
	IFS=$'\n'
	for thefolder in $(find /Volumes//System/Library/CoreServices /Volumes//EFI/BOOT -maxdepth 0); do
	local volume=""
	local version=""
	volume="${thefolder/\/System\/Library\/CoreServices/}"
	volume="${volume/\/EFI\/BOOT/}"
	volume="$(getvolumename "$volume")"
	local theversionfile="$thefolder/SystemVersion.plist"
	if [[ -f "$theversionfile" ]]; then
	version=$(/usr/libexec/PlistBuddy -c 'Print :ProductVersion' "$theversionfile")
	fi
	printf 'makemultilinedisklabel "%s" "%s"$%c\\n%c"%s"\n' "$thefolder" "${volume/Recovery HD/Recovery}" "'" "'" "$version"
	done
	}


	clearOpenFolders () {
	# Clear open folder list of hfs partitions (finderinfo[2] in bless --info).
	# If you have an HFS+ disk that has folders that open when you mount them (such as an installer), then this will stop that from happening.
	IFS=$'\n'
	for diskinfo in $(diskutil list \| LANG=C sed -nE $'/^ [0-9]+: +Apple_HFS (\xe2\x81\xa8)?(.[^ \xa9])(\xe2\x81\xa9)? +[0-9.]+ [^ ]?B +(disk[0-9]+s[0-9]+)$/''s//\2_\4/p'); do
	local slice="${diskinfo##*_}"
	local volume=""
	volume="$(getvolumename "$slice")"
	local mountpoint=""
	mountpoint=$(mountpartition "_hfs" "$slice" "$volume")
	echo "#$slice=$mountpoint,$volume ($version)"
	local theblessfolder=""
	local theblessfile=""
	local theblessopen=""
	getblessinfo "$mountpoint"
	if [[ -n $theblessopen ]]; then
	echo "Clearing open folder list"
	sudo "$directbless" --folder "$theblessfolder" --file "$theblessfile"
	fi
	done
	}


	getdiskinfo () {
	local thedisk="$1" # the disk you want info for (either a mountpoint like "/" or a device "disk0s1")
	local thevarprefix="$2" # prefix for variable names
	# note: if thevarprefix is empty then you should clear any variables you want to use from this result beforehand
	unsetall "$thevarprefix"
	eval "$(showdiskinfo "$thedisk" "$thevarprefix")"
	}


	showdiskinfo () {
	local thedisk="$1" # the disk you want info for (either a mountpoint like "/" or a device "disk0s1")
	local thevarprefix="$2" # prefix for variable names
	diskutil info -plist "$thedisk" \| plutil -p - \| perl -nE 'if (s/ "([^"]+)" => "?(.?)"?$/'"$thevarprefix"'\1=\2/) { s/"/\\"/g; s/([^=]+=)(.*)/\1"\2"/; print $_ }'
	}


	getapfsroles () {
	# $1 = the apfs container
	local patVolumeGroup="^(Data\|System)="
	for theapfsvolume in $(
	diskutil apfs list -plist "$1" \| plutil -convert json -o - - \| perl -e '
	use JSON::PP; my $apfs = decode_json (<>);
	foreach my $volume (@{$apfs->{Containers}[0]{Volumes}}) {print $volume->{Roles}[0] . "=" . $volume->{DeviceIdentifier} . "\n";}
	'
	); do
	diskutil_role_APFSVolumeGroupID=""
	if [[ $theapfsvolume =~ $patVolumeGroup ]]; then
	getdiskinfo "${theapfsvolume#*=}" "diskutil_role_"
	fi
	echo "${diskutil_role_APFSVolumeGroupID}_${theapfsvolume}"
	done
	}


	setbootername () {
	local thedisk="$1"
	local NewBooterName="$2"

	local diskutil_sbn_Root_BooterDeviceIdentifier=""
	getdiskinfo "$thedisk" diskutil_sbn_Root_
	if [[ -n $diskutil_sbn_Root_BooterDeviceIdentifier ]]; then
	diskutil mount "$diskutil_sbn_Root_BooterDeviceIdentifier"
	local diskutil_sbn_Root_VolumeUUID=""
	local diskutil_sbn_Root_APFSVolumeGroupID=""
	getdiskinfo "$diskutil_sbn_Root_BooterDeviceIdentifier" "diskutil_sbn_Preboot_"
	if [[ -n $diskutil_sbn_Preboot_MountPoint ]]; then
	local theUUID=""
	if [[ -d $diskutil_sbn_Preboot_MountPoint/$diskutil_sbn_Root_VolumeUUID ]]; then
	theUUID=$diskutil_sbn_Root_VolumeUUID
	echo "using VolumeUUID"
	elif [[ -d $diskutil_sbn_Preboot_MountPoint/$diskutil_sbn_Root_APFSVolumeGroupID ]]; then
	theUUID=$diskutil_sbn_Root_APFSVolumeGroupID
	echo "using APFSVolumeGroupID"
	else
	echo "unknown UUID in booter"
	ls -l "$diskutil_sbn_Preboot_MountPoint"
	return 1
	fi
	local thefile="$diskutil_sbn_Preboot_MountPoint/$theUUID/System/Library/CoreServices/.disk_label.contentDetails"
	if [[ -f "$thefile" ]]; then
	echo "$thefile already exists: $(cat "$thefile")"
	else
	sudo bash -c "echo \"$NewBooterName\" > \"$thefile\""
	echo "$thefile is created"
	fi
	else
	echo "$diskutil_sbn_Root_BooterDeviceIdentifier is not mounted"
	fi
	else
	echo "No booter device"
	fi
	}


	doperlonmounteddisks () {
	diskutil list -plist \| plutil -convert json -o - - \| perl -e '
	use JSON::PP; my $disks = decode_json (<>)->{AllDisksAndPartitions};
	foreach my $disk (@$disks) {
	foreach my $type ("APFSVolumes","Partitions") {
	foreach my $part (@{$disk->{$type}}) {
	if (exists $part->{MountPoint}) {
	'"$1"'
	}
	}
	}
	}
	'
	}


	getallmounteddisks () {
	# not all disks are mounted at /Volumes so use diskutil to find them
	if [[ "$1" == "-d" ]]; then
	doperlonmounteddisks 'print $part->{DeviceIdentifier} . ":" . $part->{MountPoint} . "\n";'
	else
	doperlonmounteddisks 'print $part->{MountPoint} . "\n";'
	fi
	}


	fixcustomiconflag () {
	local thefolder="$1"
	# if the folder is a mount point then the icon should be in datafork of ".VolumeIcon.icns"
	# otherwise the icon should be in a icns resource in "Icon\n"
	local thefinderinfo=""
	local newfinderinfo=""
	thefinderinfo=$(xattr -px com.apple.FinderInfo "$thefolder" 2> /dev/null \| xxd -p -r \| xxd -p -c 32)
	if [[ -z "$thefinderinfo" ]]; then
	newfinderinfo="0000000000000000040000000000000000000000000000000000000000000000"
	echo "# creating FinderInfo $newfinderinfo $thefolder"
	else
	newfinderinfo=${thefinderinfo:0:17}$(printf "%x" $((${thefinderinfo:17:1} \| 4)) )${thefinderinfo:18}
	if [[ "$newfinderinfo" != "$thefinderinfo" ]]; then
	echo "# modifying FinderInfo $newfinderinfo $thefolder"
	else
	echo "# unchanged FinderInfo $newfinderinfo $thefolder"
	fi
	fi

	if [[ "$newfinderinfo" != "$thefinderinfo" ]]; then
	xattr -wx com.apple.FinderInfo "$newfinderinfo" "$thefolder"
	fi
	}


	fixcustomiconflagofallvolumes () {
	IFS=$'\n'
	for themount in $(getallmounteddisks); do
	if [[ -f "$themount/.VolumeIcon.icns" ]]; then
	fixcustomiconflag "$themount"
	fi
	done
	}