We should reduce locales as a separate build step as locale-archive may be in use during system run

common.xml

@@ -449,6 +449,62 @@ rm /lib/systemd/system/build
   </exec>
  </target>
 
+ <target name="reduce-locales">
+  <fail unless="BOARD" message="Correct machine type must be specified"/>
+  <antcall target="copy-to-secondary"/>
+  <antcall target="mount"/>
+  <antcall target="setup-reduce-locales"/>
+  <antcall target="unmount"/>
+  <antcall target="run-system-with-secondary-${BOARD}"/>
+  <antcall target="check-reduce-locales-success"/>
+  <antcall target="copy-back"/>
+ </target>
+
+ <target name="setup-reduce-locales">
+  <antcall target="setup-reduce-locales-ab"/>
+ </target>
+
+ <target name="setup-reduce-locales-ab" if="ABstart">
+  <delete file="${sysdir}/.success"/>
+  <echo file="${sysdir}/lib/systemd/system/reduce-locales.service">[Unit]
+Description=Reduce locales
+
+[Service]
+Type=oneshot
+StandardOutput=tty
+ExecStart=/lib/systemd/system/reduce-locales
+ExecStartPost=/sbin/poweroff
+
+[Install]
+WantedBy=rescue.target
+</echo>
+  <echo file="${sysdir}/lib/systemd/system/reduce-locales">#!/bin/sh
+/sbin/fsck -yf /dev/${SECONDARY}2
+/bin/mount -o discard /dev/${SECONDARY}2 /mnt
+rm /mnt/usr/lib/locale/locale-archive
+chroot mnt localedef -i en_GB -f UTF-8 en_GB.UTF-8
+/bin/umount /dev/${SECONDARY}2
+/bin/mount -o remount,rw /
+/usr/bin/touch /.success
+/bin/rm -rf /etc/systemd/system/rescue.target.wants
+/bin/rm /lib/systemd/system/reduce-locales.service
+/bin/rm /lib/systemd/system/reduce-locales
+</echo>
+  <chmod file="${sysdir}/lib/systemd/system/reduce-locales" perm="755"/>
+  <mkdir dir="${sysdir}/etc/systemd/system/rescue.target.wants"/>
+  <exec executable="ln" failonerror="true">
+   <arg line="-s /lib/systemd/system/reduce-locales.service ${sysdir}/etc/systemd/system/rescue.target.wants/reduce-locales.service"/>
+  </exec>
+ </target>
+
+ <target name="check-reduce-locales-success">
+  <antcall target="mount"/>
+  <available file="${sysdir}/.success" property="success"/>
+  <delete file="${sysdir}/.success"/>
+  <antcall target="unmount"/>
+  <fail message="Locale reduction has failed" unless="success"/>
+ </target>
+
  <target name="build-image">
   <fail unless="BOARD" message="Correct machine type must be specified"/>
   <antcall target="mount"/>