classes/buildhistory: save metadata revisions

Always write the metadata revisions for each layer into a machine-
readable "metadata-revs" file so that you can potentially link changes
in the output back to changes in the metadata. (Unlike the existing
similar build-id file, this is not specific to image changes.)

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

diff --git a/meta/classes/buildhistory.bbclass b/meta/classes/buildhistory.bbclass
index 76648c949918bc641459b7fd882412de56775f8d..e121088d597390ae41e9b20234ece8ffdc684d98 100644 (file)
--- a/meta/classes/buildhistory.bbclass
+++ b/meta/classes/buildhistory.bbclass
@@ -354,6 +354,15 @@ def buildhistory_get_layers(d):
     layertext = "Configured metadata layers:\n%s\n" % '\n'.join(get_layers_branch_rev(d))
     return layertext
 
+def buildhistory_get_metadata_revs(d):
+    # We want an easily machine-readable format here, so get_layers_branch_rev isn't quite what we want
+    layers = (d.getVar("BBLAYERS", True) or "").split()
+    medadata_revs = ["%-17s = %s:%s" % (os.path.basename(i), \
+        base_get_metadata_git_branch(i, None).strip(), \
+        base_get_metadata_git_revision(i, None)) \
+            for i in layers]
+    return '\n'.join(medadata_revs)
+
 
 def squashspaces(string):
     import re
@@ -382,19 +391,25 @@ buildhistory_commit() {
                return
        fi
 
+       # Create a machine-readable list of metadata revisions for each layer
+       cat > ${BUILDHISTORY_DIR}/metadata-revs <<END
+${@buildhistory_get_metadata_revs(d)}
+END
+
        ( cd ${BUILDHISTORY_DIR}/
                # Initialise the repo if necessary
                if [ ! -d .git ] ; then
                        git init -q
                fi
-               # Ensure there are new/changed files to commit
-               repostatus=`git status --porcelain`
+               # Check if there are new/changed files to commit (other than metadata-revs)
+               repostatus=`git status --porcelain | grep -v " metadata-revs$"`
                if [ "$repostatus" != "" ] ; then
-                       git add ${BUILDHISTORY_DIR}/*
+                       git add .
                        HOSTNAME=`hostname 2>/dev/null || echo unknown`
                        # porcelain output looks like "?? packages/foo/bar"
+                       # Ensure we commit metadata-revs with the first commit
                        for entry in `echo "$repostatus" | awk '{print $2}' | awk -F/ '{print $1}' | sort | uniq` ; do
-                               git commit ${BUILDHISTORY_DIR}/$entry -m "$entry: Build ${BUILDNAME} of ${DISTRO} ${DISTRO_VERSION} for machine ${MACHINE} on $HOSTNAME" --author "${BUILDHISTORY_COMMIT_AUTHOR}" > /dev/null
+                               git commit $entry metadata-revs -m "$entry: Build ${BUILDNAME} of ${DISTRO} ${DISTRO_VERSION} for machine ${MACHINE} on $HOSTNAME" --author "${BUILDHISTORY_COMMIT_AUTHOR}" > /dev/null
                        done
                        if [ "${BUILDHISTORY_PUSH_REPO}" != "" ] ; then
                                git push -q ${BUILDHISTORY_PUSH_REPO}