Add submodule_update.sh

Signed-off-by: Severin Kaderli <severin.kaderli@gmail.com>

system/bin/submodule_update.sh

@@ -0,0 +1,52 @@
+#!/bin/bash
+# 
+# SCRIPT NAME:
+# submodule_update.sh
+#
+# AUTHOR:
+# Severin Kaderli <severin.kaderli@gmail.com>
+#
+# DESCRIPTION:
+# Updates the submodules in all Git repositories in this folder and creates a
+# new commit and pushes it. Only when there are no staged changes pending.
+#
+# USAGE:
+# ./submodule_update.sh
+. utils.sh
+
+START_DIR=$(pwd)
+
+for dir in $(find . -name .git -type d -prune)
+do
+    cd "$dir" || exit 1
+    cd .. || exit 1
+    print_section "Checking $(pwd)"
+
+    if [ -z "$(git status --porcelain)" ]
+    then
+        print_log "No pending changes"
+        print_log "Updating submodules"
+        git pl > /dev/null 2>&1
+
+        # Check if any changes are available
+        if [ -z "$(git status --porcelain)" ]
+        then
+            print_log "No updates found"
+        else
+            print_log "Updates found"
+            print_log "Creating commit"
+            git a > /dev/null 2>&1
+            git c -m "Update submodules" > /dev/null 2>&1
+            print_log "Pushing commit"
+            git p > /dev/null 2>&1
+            print_log "Commit was pushed"
+        fi
+    else
+        print_log "Pending changes. Ignoring"
+    fi
+
+    echo -e ""
+
+    cd "${START_DIR}" || exit 1
+
+done