[PATCH v2 3/6] meta/dpkg: pull out actual build command from 'do_build'

[Henning Schild <henning.schild@siemens.com>]

Issue:
The 'do_build' task in dpkg does more than just building, it also
prepares the build environment and cleans it up after building.
Other classes building debian packages might need the same steps while
implementing the actual build step in a different way.

Change:
Pull the actual building out into a function that gets called from
'do_build' between the pre and post stuff.

Impact:
This patch does not change the behaviour of Isar. It addresses the issue
and prepares for another patch.

Signed-off-by: Henning Schild <henning.schild@siemens.com>
---
 meta/classes/dpkg.bbclass | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/meta/classes/dpkg.bbclass b/meta/classes/dpkg.bbclass
index abd4cef..5c3c1f8 100644
--- a/meta/classes/dpkg.bbclass
+++ b/meta/classes/dpkg.bbclass
@@ -15,10 +15,15 @@ BUILDROOT = "${BUILDCHROOT_DIR}/${PP}"
 do_build[stamp-extra-info] = "${DISTRO}-${DISTRO_ARCH}"
 
 # Build package from sources using build script
+dpkg_runbuild() {
+    sudo chroot ${BUILDCHROOT_DIR} /build.sh ${PP}/${SRC_DIR}
+}
+
+# Wrap the function dpkg_runbuild with the bind mount for buildroot
 do_build() {
     mkdir -p ${BUILDROOT}
     sudo mount --bind ${WORKDIR} ${BUILDROOT}
-    sudo chroot ${BUILDCHROOT_DIR} /build.sh ${PP}/${SRC_DIR}
+    dpkg_runbuild
     sudo umount ${BUILDROOT}
     rm -rf ${BUILDROOT}
 }
-- 
2.13.5