1 files changed, 22 insertions, 0 deletions
diff --git a/lib/MDV/Draklive/Overlay.pm b/lib/MDV/Draklive/Overlay.pm
new file mode 100644
index 0000000..50b9cdd
--- /dev/null
+++ b/lib/MDV/Draklive/Overlay.pm
@@ -0,0 +1,22 @@
+package MDV::Draklive::Overlay;
+
+use MDV::Draklive::Loopback;
+
+our %overlay = (
+    unionfs => {
+        modules => [ qw(unionfs) ],
+        mount => sub {
+            my ($live) = @_;
+            #- build dirs list: "dir1=ro:dir2:ro:dir3=rw"
+            my $dirs = join(':',
+                            map {
+                                $_->{list} ? "\$(cat $live->{prefix}{live}{mnt}/$_->{list})" :
+                                  "$live->{prefix}{live}{mnt}$_->{mountpoint}=" .
+                                    (!$loop_types{$_->{type}}{read_only} && !$_->{read_only} ? 'rw' : 'ro');
+                            } reverse grep { !$_->{fallback} } @{$live->{mount}{dirs} || []});
+            "sh -c 'mount -o dirs=$dirs -t unionfs unionfs $live->{prefix}{live}{mnt}$live->{mount}{root}'";
+        },
+    },
+);
+
+1;