Add script for auto-propagating changes to modern branches where possible [skip ci]

Author: embeddedt

scripts/propagate.sh

@@ -0,0 +1,44 @@
+#!/bin/bash
+set -e
+
+WORK_DIR=`mktemp -d`
+
+# deletes the temp directory
+function cleanup {
+  cd $HOME
+  rm -rf "$WORK_DIR"
+}
+
+trap cleanup EXIT
+
+# clone ModernFix repo
+
+echo "downloading temporary modernfix..."
+cd $WORK_DIR
+git clone https://github.com/embeddedt/ModernFix mfix &>/dev/null
+cd mfix
+
+# gather version list
+readarray -t all_versions < <(git ls-remote --heads origin | awk '{print $2}' | sed 's:.*/::' | sort -V)
+echo "found versions: ${all_versions[@]}"
+
+# checkout base version
+git checkout -b propagations/${all_versions[0]} origin/${all_versions[0]} &>/dev/null
+
+our_version=${all_versions[0]}
+restore_version=$our_version
+
+for version in "${all_versions[@]}"; do
+    if ! { echo "$version"; echo "$our_version"; } | sort --version-sort --check &>/dev/null; then
+        echo -n "merging $our_version into ${version}... "
+        git checkout -b propagations/$version origin/$version &>/dev/null
+        if git merge -m "Merge $our_version into $version" propagations/$our_version >/dev/null; then
+            echo "done"
+            git push -u origin propagations/$version:$version &>/dev/null
+        else
+            echo "failed, this merge must be done manually"
+            exit 1
+        fi
+        our_version=$version
+    fi
+done