check submodule updates when task.subupdates is set

forgebuild.sh

@@ -226,12 +226,14 @@ for p_name in ${PROJECTS[*]}; do
     debug already_cloned
     cd "$p_dir"
     # Refresh remote before comparing with local
-	git fetch --quiet origin
+    if ! git fetch --quiet origin; then
+        error pull_failed
+        exit 1
+    fi
     git diff --quiet remotes/origin/$p_branch
     if [[ $? != 0 ]]; then
     	info pull
-		# Update all submodules, for now only when the main repo changed (TODO)
-		if ! git pull --quiet --recurse-submodules; then
+    	if ! git pull --quiet; then #--recurse-submodules; then
             error pull_failed
             exit 1
         fi
@@ -240,9 +242,26 @@ for p_name in ${PROJECTS[*]}; do
     elif [[ $FORCE = 1 ]]; then
         debug forcing
     	run $p_name
+    else
+        # No update on the primary branch, but maybe there's a submodule update?
+        if [ -f $BASEDIR/$p_name.subupdates ]; then
+            git submodule foreach --recursive 'if ! git fetch --quiet origin; then\
+                error pull_failed\
+                exit 1\
+            fi\
+            git diff --quiet remotes/origin/$(git rev-parse --abbrev-ref HEAD)\
+            if [[ $? != 0 ]]; then\
+                info pull\
+                if ! git pull --quiet; then\
+                    error pull_failed\
+                    exit 1\
+                fi\
+            fi'
+            run $p_name
         else
             debug no_update
         fi
+    fi
 done
 
 # Check the PID in lockfile is still ours, we don't want