xbps-triggers: support importing/unimporting binfmt files

removes the need to manually list all the binfmt magics and masks in
qemu-user-static.

keeps the legacy behaviour around for compatibility

srcpkgs/xbps-triggers/files/binfmts

@@ -19,32 +19,65 @@ UPDATE="$5"
 
 export PATH="usr/bin:usr/sbin:/usr/sbin:/usr/bin:/sbin:/bin"
 
+# {install,remove}_binfmts: legacy installation style
+install_binfmts() {
+	echo "$binfmts" | while read -r line; do
+		set -- $line
+		_bin="$1"; shift
+		_bname="${_bin##*/}"
+		update-binfmts --package "${PKGNAME}" --install "${_bname}" "${_bin}" "$@"
+	done
+}
+
+remove_binfmts() {
+	echo "$binfmts" | while read -r line; do
+		set -- $line
+		_bin="$1"; shift
+		_bname="${_bin##*/}"
+		if [ -f "var/lib/binfmts/${_bname}" ]; then
+			update-binfmts --package "${PKGNAME}" --remove "${_bname}" "${_bin}"
+		fi
+	done
+}
+
+# {,un}import_binfmts: new installation style
+import_binfmts() {
+	for _fmt in $import_binfmts; do
+		update-binfmts --import "$_fmt"
+	done
+}
+
+unimport_binfmts() {
+	for _fmt in $import_binfmts; do
+		if [ -f "var/lib/binfmts/${_fmt}" ]; then
+			update-binfmts --unimport "$_fmt"
+		fi
+	done
+}
+
 case "$ACTION" in
 targets)
 	echo "post-install pre-remove"
 	;;
 run)
 	[ -x /usr/bin/update-binfmts ] || exit 0
-	[ -z "${binfmts}" ] && exit 0
 
 	case "$TARGET" in
 	post-install)
-		echo "$binfmts" | tr '\' '&' 2> /dev/null | while read line; do
+		if [ -n "${binfmts}" ]; then
-			line=$(echo $line | tr '&' '\' 2> /dev/null)
+			install_binfmts
-			set -- ${line}
+		fi
-			_bin="$1"; shift; _args="$@"; _bname="$(basename ${_bin})"
+		if [ -n "${import_binfmts}" ]; then
-			update-binfmts --package ${PKGNAME} --install ${_bname} ${_bin} ${_args}
+			import_binfmts
-		done
+		fi
 		;;
 	pre-remove)
-		echo "$binfmts" | tr '\' '&' 2> /dev/null | while read line; do
+		if [ -n "${binfmts}" ]; then
-			line=$(echo $line | tr '&' '\' 2> /dev/null)
+			remove_binfmts
-			set -- ${line}
+		fi
-			_bin="$1"; shift; _args="$@"; _bname="$(basename ${_bin})"
+		if [ -n "${import_binfmts}" ]; then
-			if [ -f /var/lib/binfmts/${_bname} ]; then
+			unimport_binfmts
-				update-binfmts --package ${PKGNAME} --remove ${_bname} ${_bin}
 		fi
-		done
 		;;
 	*)
 		exit 1

srcpkgs/xbps-triggers/template

@@ -1,6 +1,6 @@
 # Template file for 'xbps-triggers'
 pkgname=xbps-triggers
-version=0.127
+version=0.128
 revision=1
 bootstrap=yes
 short_desc="XBPS triggers for Void Linux"