From 53672efe1950f8e72cedc61e619898b0e91c1f77 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?H=C3=A9ctor=20Ramos?=
 <165856+hramos@users.noreply.github.com>
Date: Fri, 12 Oct 2018 14:15:06 -0700
Subject: [PATCH] Enforce lockfile is kept up to date (#21739)

---
 scripts/circleci/validate_yarn_lockfile.sh | 39 ++++++++++++++++++++++
 1 file changed, 39 insertions(+)
 create mode 100755 scripts/circleci/validate_yarn_lockfile.sh

diff --git a/scripts/circleci/validate_yarn_lockfile.sh b/scripts/circleci/validate_yarn_lockfile.sh
new file mode 100755
index 00000000000..5626dd9567b
--- /dev/null
+++ b/scripts/circleci/validate_yarn_lockfile.sh
@@ -0,0 +1,39 @@
+#!/bin/bash
+
+# Abort the mission if any command fails
+set -e
+
+# Allow the script to be invoked from various environments
+if [[ -z "${OVERRIDE_YARN_BINARY}" ]]; then
+  YARN_BINARY=$(command -v yarn)
+else
+  YARN_BINARY="${OVERRIDE_YARN_BINARY}"
+fi
+
+REACT_NATIVE_TEMP_DIR=$(mktemp -d /tmp/react-native-XXXXXXXX)
+
+function cleanup {
+  set +e
+  rm -rf "$REACT_NATIVE_TEMP_DIR"
+  set -e
+}
+
+function msg {
+  echo -e " "
+  echo -e "\\x1B[36m${1}\\x1B[0m";
+  echo -e "\\x1B[36m${1//?/=}\\x1B[0m"
+}
+
+trap cleanup EXIT
+
+cp -R ./package.json "$REACT_NATIVE_TEMP_DIR"
+cp -R ./yarn.lock "$REACT_NATIVE_TEMP_DIR"
+pushd "$REACT_NATIVE_TEMP_DIR" >/dev/null
+
+if ! $YARN_BINARY --ignore-scripts --silent --non-interactive --mutex network --frozen-lockfile; then
+  msg "Yarn validation failed."
+  echo "This means the package.json and yarn.lock disagree in some way."
+  echo "Try fixing it by running \`yarn\` and committing the changes."
+fi
+
+popd >/dev/null