diff --git a/poky/meta/classes/buildhistory.bbclass b/poky/meta/classes/buildhistory.bbclass
index 8db79a4..4ba9ec8 100644
--- a/poky/meta/classes/buildhistory.bbclass
+++ b/poky/meta/classes/buildhistory.bbclass
@@ -508,7 +508,7 @@
 
 	# Set correct pkgdatadir
 	pkgdatadir=${PKGDATA_DIR}
-	if [ "$2" == "sdk" ] && [ "$3" == "host" ]; then
+	if [ "$2" = "sdk" ] && [ "$3" = "host" ] ; then
 		pkgdatadir="${PKGDATA_DIR_SDK}"
 	fi
 
@@ -741,30 +741,10 @@
     statusheader = d.getVar('BUILDCFG_HEADER')
     return('\n%s\n%s\n' % (statusheader, '\n'.join(statuslines)))
 
-def buildhistory_get_modified(path):
-    # copied from get_layer_git_status() in image-buildinfo.bbclass
-    import subprocess
-    try:
-        subprocess.check_output("""cd %s; export PSEUDO_UNLOAD=1; set -e;
-                                git diff --quiet --no-ext-diff
-                                git diff --quiet --no-ext-diff --cached""" % path,
-                                shell=True,
-                                stderr=subprocess.STDOUT)
-        return ""
-    except subprocess.CalledProcessError as ex:
-        # Silently treat errors as "modified", without checking for the
-        # (expected) return code 1 in a modified git repo. For example, we get
-        # output and a 129 return code when a layer isn't a git repo at all.
-        return " -- modified"
-
 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") or "").split()
-    medadata_revs = ["%-17s = %s:%s%s" % (os.path.basename(i), \
-        base_get_metadata_git_branch(i, None).strip(), \
-        base_get_metadata_git_revision(i, None), \
-        buildhistory_get_modified(i)) \
-            for i in layers]
+    # We want an easily machine-readable format here
+    revisions = oe.buildcfg.get_layer_revisions(d)
+    medadata_revs = ["%-17s = %s:%s%s" % (r[1], r[2], r[3], r[4]) for r in revisions]
     return '\n'.join(medadata_revs)
 
 def outputvars(vars, listvars, d):