docker: Define override-able BUILD_TAGS

DOCKER_BUILDTAGS has tags that exclude btrfs and devicemapper graph
drivers. To enable either, the tags have to be removed, but this isn't
easily possible as DOCKER_BUILDTAGS can't be overridden via a
bbappend.

Define a BUILD_TAGS variable in the docker recipe that is set with the
exclude tags, and use it for setting DOCKER_BUILDTAGS.  This makes it
possible for downstream to tweak BUILD_TAGS/DOCKER_BUILD_TAGS via a
bbappend.

Signed-off-by: Anoop Karollil <anoop.karollil@ge.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/recipes-containers/docker/docker_git.bb b/recipes-containers/docker/docker_git.bb
index feca5362..e45f87e0 100644
--- a/recipes-containers/docker/docker_git.bb
+++ b/recipes-containers/docker/docker_git.bb
@@ -63,6 +63,8 @@ PV = "${DOCKER_VERSION}+git${SRCREV_moby}"
 PACKAGES =+ "${PN}-contrib"
 
 DOCKER_PKG="github.com/docker/docker"
+# in order to exclude devicemapper and btrfs - https://github.com/docker/docker/issues/14056
+BUILD_TAGS = "exclude_graphdriver_btrfs exclude_graphdriver_devicemapper"
 
 inherit go
 inherit goarch
@@ -91,8 +93,7 @@ do_compile() {
         export CGO_ENABLED="1"
         export CGO_CFLAGS="${CFLAGS} --sysroot=${STAGING_DIR_TARGET}"
         export CGO_LDFLAGS="${LDFLAGS} --sysroot=${STAGING_DIR_TARGET}"
-        # in order to exclude devicemapper and btrfs - https://github.com/docker/docker/issues/14056
-        export DOCKER_BUILDTAGS='exclude_graphdriver_btrfs exclude_graphdriver_devicemapper ${PACKAGECONFIG_CONFARGS}'
+        export DOCKER_BUILDTAGS='${BUILD_TAGS} ${PACKAGECONFIG_CONFARGS}'
 
         export DISABLE_WARN_OUTSIDE_CONTAINER=1