metadata_scm.bbclass: Use immediate expansion for the METADATA_* variables

Define METADATA_BRANCH and METADATA_REVISION using immediate expansion.
This avoids running `git rev-parse HEAD` multiple times during recipe
parsing.

(From OE-Core rev: f76fc325520386c0d25c6d6b422c85e9fb87e663)

Signed-off-by: Peter Kjellerstedt <peter.kjellerstedt@axis.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 34e1841ec14c545c73fbe03a9f946d43d65ab326)
Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 5 insertions, 5 deletions

diff --git a/meta/classes/metadata_scm.bbclass b/meta/classes/metadata_scm.bbclass
index 2608a7ef7b..47cb969b8d 100644
--- a/meta/classes/metadata_scm.bbclass
+++ b/meta/classes/metadata_scm.bbclass
@@ -1,8 +1,3 @@
-METADATA_BRANCH ?= "${@base_detect_branch(d)}"
-METADATA_BRANCH[vardepvalue] = "${METADATA_BRANCH}"
-METADATA_REVISION ?= "${@base_detect_revision(d)}"
-METADATA_REVISION[vardepvalue] = "${METADATA_REVISION}"
-
 def base_detect_revision(d):
     path = base_get_scmbasepath(d)
     return base_get_metadata_git_revision(path, d)
@@ -42,3 +37,8 @@ def base_get_metadata_git_revision(path, d):
     except bb.process.ExecutionError:
         rev = '<unknown>'
     return rev.strip()
+
+METADATA_BRANCH := "${@base_detect_branch(d)}"
+METADATA_BRANCH[vardepvalue] = "${METADATA_BRANCH}"
+METADATA_REVISION := "${@base_detect_revision(d)}"
+METADATA_REVISION[vardepvalue] = "${METADATA_REVISION}"