Added subdirectory sharing as configuration feature.

[rrq/overlay-boot.git] / overlay-boot.8.adoc

diff --git a/overlay-boot.8.adoc b/overlay-boot.8.adoc
index 01ae70904f37c19e364352530171bba5ae26a4a5..974759eefe157a48f3111924992156cbc23b36ad 100644 (file)
--- a/overlay-boot.8.adoc
+++ b/overlay-boot.8.adoc
@@ -166,6 +166,14 @@ This variable nominates the "work" directory for an overlay mount. It
 has to be a writable directory on the same mount device as the UPPER
 directory.
 
+*SHARE*::
+
+This variable nominates a pathname under $LOWER to bind-mount onto the
+same pathname under $LIVE so as to share that directory tree into the
+overlay. The SHARE variable is a special configuration variable in
+that the value does not allow exclamation mark evaluation, and that it
+may occur many times for declaring multiple shared subdirectories.
+
 Networking
 ----------