[gnome-continuous-yocto/gnomeostree-3.28-rocko: 7970/8267] image_types: Fix bmaptool support for RSS

[Emmanuele Bassi <ebassi src gnome org>]

commit d4adc029891aeda4b9f132e1d674afc25a0ee4b0
Author: Tom Rini <trini konsulko com>
Date:   Fri Sep 29 10:28:19 2017 -0400

    image_types: Fix bmaptool support for RSS
    
    With RSS we need to ensure that when making a bmap image that the
    python3 that we created is found via /usr/bin/env rather than the host
    python3.  Otherwise we're relying on the build host to have bmaptool
    support installed.
    
    (From OE-Core rev: a93c5869cb716cba5e05bbe4fc2e1c11adb9e30f)
    
    Signed-off-by: Tom Rini <trini konsulko com>
    Signed-off-by: Ross Burton <ross burton intel com>
    Signed-off-by: Richard Purdie <richard purdie linuxfoundation org>

 meta/classes/image_types.bbclass |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/meta/classes/image_types.bbclass b/meta/classes/image_types.bbclass
index 61dca62..b373b21 100644
--- a/meta/classes/image_types.bbclass
+++ b/meta/classes/image_types.bbclass
@@ -311,3 +311,6 @@ DEPLOYABLE_IMAGE_TYPES ?= "hddimg iso"
 # The IMAGE_TYPES_MASKED variable will be used to mask out from the IMAGE_FSTYPES,
 # images that will not be built at do_rootfs time: vmdk, vdi, qcow2, hdddirect, hddimg, iso, etc.
 IMAGE_TYPES_MASKED ?= ""
+
+# bmap requires python3 to be in the PATH
+EXTRANATIVEPATH += "${@'python3-native' if d.getVar('IMAGE_FSTYPES').find('.bmap') else ''}"