build: log submodule update from git-submodule.sh

Print exactly which submodules have been updated, by reusing the logic of
"git-submodule.sh validate" after executing "git submodule update --init'.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

Makefile

@@ -52,9 +52,7 @@ Makefile: .git-submodule-status
 .PHONY: git-submodule-update
 git-submodule-update:
 ifneq ($(GIT_SUBMODULES_ACTION),ignore)
-	$(call quiet-command, \
-		(GIT=git "$(SRC_PATH)/scripts/git-submodule.sh" $(GIT_SUBMODULES_ACTION) $(GIT_SUBMODULES)), \
-		"GIT","$(GIT_SUBMODULES)")
+	$(quiet-@)GIT=git "$(SRC_PATH)/scripts/git-submodule.sh" $(GIT_SUBMODULES_ACTION) $(GIT_SUBMODULES)
 endif
 
 # 0. ensure the build tree is okay

scripts/git-submodule.sh

@@ -46,6 +46,13 @@ validate_error() {
     exit 1
 }
 
+check_updated() {
+    local CURSTATUS OLDSTATUS
+    CURSTATUS=$($GIT submodule status $module)
+    OLDSTATUS=$(grep $module $substat)
+    test "$CURSTATUS" = "$OLDSTATUS"
+}
+
 if test -n "$maybe_modules" && ! test -e ".git"
 then
     echo "$0: unexpectedly called with submodules but no git checkout exists"
@@ -75,11 +82,7 @@ status|validate)
     test -f "$substat" || validate_error "$command"
     test -z "$maybe_modules" && exit 0
     for module in $modules; do
-        CURSTATUS=$($GIT submodule status $module)
-        OLDSTATUS=$(cat $substat | grep $module)
-        if test "$CURSTATUS" != "$OLDSTATUS"; then
-            validate_error "$command"
-        fi
+        check_updated $module || validate_error "$command"
     done
     exit 0
     ;;
@@ -89,6 +92,9 @@ update)
 
     $GIT submodule update --init $modules 1>/dev/null
     test $? -ne 0 && update_error "failed to update modules"
+    for module in $modules; do
+        check_updated $module || echo Updated "$module"
+    done
 
     (while read -r; do
         for module in $modules; do