1 files changed, 38 insertions, 0 deletions
diff --git a/fpga/.ci/scripts/refresh_ip.sh b/fpga/.ci/scripts/refresh_ip.sh
new file mode 100644
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+++ b/fpga/.ci/scripts/refresh_ip.sh
@@ -0,0 +1,38 @@
+#
+# Copyright 2022 Ettus Research, a National Instruments Brand
+#
+# SPDX-License-Identifier: LGPL-3.0-or-later
+#
+# Description:
+#
+#   This script first refreshes a given build IP directory to the current time
+#   (assume all the IP files within that directory were just built) and then
+#   the script touches all the files that changed between the current repo's
+#   working tree and a given hash (used to build IP).
+#   This allows the user to download pre-built IP (e.g. cached) and re-build
+#   only those IP components that changed in between the cached commit and the
+#   current working tree.
+#
+# Arguments:
+#
+#   $1 = absolute path to build-ip/ directory
+#   $2 = git hash used to build IP in $1
+#
+# Example:
+#
+#   bash .refresh_ip.sh `realpath path/to/build-ip` 1234abc
+#
+
+# # Step 1: refresh build-ip/ directory to current time
+echo "[refresh_ip.sh] Resetting timestamp for files in $1"
+find $1 -type f -exec touch --no-create {} +
+
+# # Step 2: determine all files that changed and update their time (dirty)
+echo "[refresh_ip.sh] Differences between $2 and working tree (marked dirty):"
+git diff --line-prefix=`git rev-parse --show-toplevel`/ --name-only $2 | \
+  while read -r line; do \
+    if [[ $line == *"ip/"* ]]; then \
+      echo "    $line"; \
+      touch --no-create $line; \
+    fi \
+  done