Patch by Steven Shiau <steven@nchc.org.tw>. The only changes so far are:

 * drop the parts of the patch that are not relevant to live-boot 5.x
 * adapt formatting to match Debian Live coding standards

diff --git a/components/9990-misc-helpers.sh b/components/9990-misc-helpers.sh
index 87c4930..315e3b1 100755 (executable)
--- a/components/9990-misc-helpers.sh
+++ b/components/9990-misc-helpers.sh
@@ -1318,7 +1318,19 @@ do_union ()
                                panic "overlay needs at least one lower filesystem (read-only branch)."
                        fi
                        unionmountopts="-o noatime,lowerdir=${unionro},upperdir=${unionrw}"
-                       mount -t ${UNIONTYPE} ${unionmountopts} ${UNIONTYPE} "${unionmountpoint}"
+                       if ! mount -t ${UNIONTYPE} ${unionmountopts} ${UNIONTYPE} "${unionmountpoint}" 2>/dev/null
+                       then
+                               # Ref: kiwi from OpenSuse kiwi-7.02.18-1.1
+                               # overlayfs in version >= v22 behaves differently
+                               # + renamed from overlayfs to overlay
+                               # + requires a workdir to become mounted
+                               # + requires workdir and upperdir to reside under the same mount
+                               # + requires workdir and upperdir to be in separate subdirs
+                               mkdir ${unionrw}/rw
+                               mkdir ${unionrw}/work
+                               unionmountopts="-o noatime,lowerdir=${unionro},upperdir=${unionrw}/rw,workdir=${unionrw}/work"
+                               mount -t ${UNIONTYPE} ${unionmountopts} ${UNIONTYPE} "${unionmountpoint}"
+                       fi
                        ;;
        esac
 }