5 files changed, 33 insertions, 6 deletions
diff --git a/build/cache.sh b/build/cache.sh
index ed900568a..07361d28a 100755
--- a/build/cache.sh
+++ b/build/cache.sh
@@ -96,13 +96,32 @@ validSHA1() {
 
 # Figure out commit ID from URI and tag/branch/commit ID
 getcommitid() {
-    HEADMATCH=`git ls-remote $1 | grep "refs/heads/$2$" | awk '{ print $1 }'`
-    TAGMATCH=`git ls-remote $1 | grep "refs/tags/$2$" | awk '{ print $1 }'`
+    if echo $2 | grep -q '^refs/changes/'; then
+        REF=`echo $2 | sed "s,refs\/changes\/\(.*\),\1,"`
+    else
+        REF=$2
+    fi
+
+    echo "Repo is $1, ref is ${REF}" >&2
+
+    HEADMATCH=`git ls-remote $1 | grep "refs/heads/${REF}$" | awk '{ print $1 }'`
+    TAGMATCH=`git ls-remote $1 | grep "refs/tags/${REF}$" | awk '{ print $1 }'`
+    CHANGEMATCH=`git ls-remote $1 | grep "refs/changes/${REF}$" | awk '{ print $1 }'`
 
     if [ -n "$HEADMATCH" ]; then
         echo "$HEADMATCH"
     elif [ -n "$TAGMATCH" ]; then
         echo "$TAGMATCH"
+    elif [ -n "$CHANGEMATCH" ]; then
+        echo "Warning: ${REF} is a change!" >&2
+        TMPDIR=`mktemp -d /tmp/cacheXXXXX`
+        cd $TMPDIR
+        git clone $1 &>/dev/null || errorexit "Could not clone $1"
+        cd * || errorexit "Could not enter clone of $1"
+	git fetch $1 refs/changes/$REF &>/dev/null || errorexit "Could not fetch change"
+	git checkout FETCH_HEAD &>/dev/null || errorexit "Could not checkout FETCH_HEAD"
+        git show HEAD &>/dev/null || errorexit "Could not find commit $2"
+        git show HEAD | head -1 | awk '{ print $2 }'
     else
         TMPDIR=`mktemp -d /tmp/cacheXXXXX`
         cd $TMPDIR
diff --git a/build/f_isoroot/f_bgpvpn-pluginbuild/Makefile b/build/f_isoroot/f_bgpvpn-pluginbuild/Makefile
index 3da8d38b9..a99a426b6 100644
--- a/build/f_isoroot/f_bgpvpn-pluginbuild/Makefile
+++ b/build/f_isoroot/f_bgpvpn-pluginbuild/Makefile
@@ -61,7 +61,7 @@ release:.bgpvpnbuild
 #   - The SHA1 hash of the HEAD on the plugin repo's $(BGPVPN_BRANCH)
 #   - The contents of this Makefile
 .cacheid:
-	if [ ! -z $(BGPVPN_CHANGE) ]; then \
+	@if [ ! -z $(BGPVPN_CHANGE) ]; then \
 	  $(CACHETOOL) getcommitid $(BGPVPN_REPO) $(BGPVPN_CHANGE) > .cachedata; \
 	else \
 	  $(CACHETOOL) getcommitid $(BGPVPN_REPO) $(BGPVPN_BRANCH) > .cachedata; \
diff --git a/build/f_isoroot/f_odlpluginbuild/Makefile b/build/f_isoroot/f_odlpluginbuild/Makefile
index 4ec7e809b..ba5a06b0e 100644
--- a/build/f_isoroot/f_odlpluginbuild/Makefile
+++ b/build/f_isoroot/f_odlpluginbuild/Makefile
@@ -47,7 +47,7 @@ release:.odlbuild
 #   - The SHA1 hash of the HEAD on the plugin repo's $(ODL_BRANCH)
 #   - The contents of this Makefile
 .cacheid:
-	git ls-remote --heads $(ODL_REPO) | grep $(ODL_BRANCH) > .cachedata
+	@$(CACHETOOL) getcommitid $(ODL_REPO) $(ODL_BRANCH) > .cachedata
 	sha1sum Makefile >> .cachedata
 	cat .cachedata | $(CACHETOOL) getid > .cacheid
 
diff --git a/build/f_isoroot/f_ovs-nsh-dpdk-pluginbuild/Makefile b/build/f_isoroot/f_ovs-nsh-dpdk-pluginbuild/Makefile
index 601ec1e17..89af75b92 100644
--- a/build/f_isoroot/f_ovs-nsh-dpdk-pluginbuild/Makefile
+++ b/build/f_isoroot/f_ovs-nsh-dpdk-pluginbuild/Makefile
@@ -60,7 +60,11 @@ release:.ovsbuild
 #   - The SHA1 hash of the HEAD on the plugin repo's $(OVS_NSH_DPDK_BRANCH)
 #   - The contents of this Makefile
 .cacheid:
-	@git ls-remote --heads $(OVS_NSH_DPDK_REPO) | grep $(OVS_NSH_DPDK_BRANCH) | awk {'print $$1'} > .cachedata
+	@if [ ! -z $(OVS_NSH_DPDK_CHANGE) ]; then \
+	  $(CACHETOOL) getcommitid $(OVS_NSH_DPDK_REPO) $(OVS_NSH_DPDK_CHANGE) > .cachedata; \
+	else \
+	  $(CACHETOOL) getcommitid $(OVS_NSH_DPDK_REPO) $(OVS_NSH_DPDK_BRANCH) > .cachedata; \
+	fi
 	@sha1sum Makefile | awk {'print $$1'} >> .cachedata
 	@sha1sum config.mk | awk {'print $$1'} >> .cachedata
 	@cat .cachedata | $(CACHETOOL) getid > .cacheid
diff --git a/build/f_isoroot/f_qemupluginbuild/Makefile b/build/f_isoroot/f_qemupluginbuild/Makefile
index 4e8d9e9f6..19a233731 100644
--- a/build/f_isoroot/f_qemupluginbuild/Makefile
+++ b/build/f_isoroot/f_qemupluginbuild/Makefile
@@ -60,7 +60,11 @@ release:.qemubuild
 #   - The SHA1 hash of the HEAD on the plugin repo's $(QEMU_BRANCH)
 #   - The contents of this Makefile
 .cacheid:
-	@git ls-remote --heads $(QEMU_REPO) | grep $(QEMU_BRANCH) | awk {'print $$1'} > .cachedata
+	@if [ ! -z $(QEMU_CHANGE) ]; then \
+	  $(CACHETOOL) getcommitid $(QEMU_REPO) $(QEMU_CHANGE) > .cachedata; \
+	else \
+	  $(CACHETOOL) getcommitid $(QEMU_REPO) $(QEMU_BRANCH) > .cachedata; \
+	fi
 	@sha1sum Makefile | awk {'print $$1'} >> .cachedata
 	@sha1sum config.mk | awk {'print $$1'} >> .cachedata
 	@cat .cachedata | $(CACHETOOL) getid > .cacheid