Add tool to bring in upstream commits

Author: virtuald

devtools/upstream.sh

@@ -0,0 +1,44 @@
+#!/bin/bash -e
+#
+# Assumes that the allwpilib repo is checked out to the correct branch
+# that needs to be added to this repo
+#
+# This script is only intended to be used by maintainers of this
+# repository, users should not need to use it.
+#
+
+abspath() {
+  # $1 : relative filename
+  echo "$(cd "$(dirname "$1")" && pwd)/$(basename "$1")"
+}
+
+if [ "$1" == "" ]; then
+    echo "Usage: $0 /path/to/allwpilib"
+    exit 1
+fi
+
+ALLWPILIB=$(abspath "$1")
+
+cd $(dirname "$0")/..
+
+if [ ! -z "$(git status --porcelain --untracked-files=no)" ]; then 
+    echo "Working tree is dirty, exiting"
+    exit 1
+fi
+
+ORIG_BRANCH="$(git symbolic-ref --short HEAD 2>/dev/null)"
+
+
+pushd "$ALLWPILIB"
+
+# TODO: this takes awhile
+git subtree split --prefix=wpilibNewCommands/src/main/native/ -b cmd-v2-upstream
+
+popd
+
+
+git checkout upstream
+
+git subtree pull --prefix commands2/src $ALLWPILIB cmd-v2-upstream
+
+git checkout $ORIG_BRANCH