From b9311e2f547251807c3982e6cb003feec3ba5c83 Mon Sep 17 00:00:00 2001
From: gnrunge <nrunge@google.com>
Date: Thu, 30 Sep 2021 11:25:03 -0700
Subject: [PATCH] ICU-21649 Adds build and execution of Unicode update tools to
 GHA CI. Checks that the build process completes without failure and that the
 generated data is identical with the data currently in the repository.

ICU-21649 Fix trigger mechanism.
---
 .github/workflows/icu_ci.yml | 37 +++++++++++++++++++++++++++++++++++-
 1 file changed, 36 insertions(+), 1 deletion(-)

diff --git a/.github/workflows/icu_ci.yml b/.github/workflows/icu_ci.yml
index e9690d934f9..622f41d2679 100644
--- a/.github/workflows/icu_ci.yml
+++ b/.github/workflows/icu_ci.yml
@@ -399,9 +399,44 @@ jobs:
       - uses: actions/checkout@v2
       - run: python3 tools/scripts/uconfig_vars_test.py -u
 
-# Run header tests with UCONFIG_NO_XXX variations.
+  # Run header tests with UCONFIG_NO_XXX variations.
   uconfig_variation-check-all-header-tests:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
       - run: python3 tools/scripts/uconfig_vars_test.py -p
+
+  # Build Unicode update tools
+  unicode-update-tools:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - uses: bazelbuild/setup-bazelisk@v1
+    - name: Mount bazel cache
+      uses: actions/cache@v2
+      with:
+        path: "~/.cache/bazel"
+        key: bazel
+
+    - name: Generate the data
+      run: |
+        export ICU_SRC=`pwd`;
+        icu4c/source/data/unidata/generate.sh;
+        if $?
+        then
+          echo
+          echo Build of Unicode update tools failed.
+          echo See
+          echo https://unicode-org.github.io/icu/processes/unicode-update#bazel-build-process
+          echo for how to reproduce and debug the failure
+          exit 1
+        fi
+
+        git diff --exit-code;
+        if $?
+        then
+          echo
+          echo ICU unicode data has changed!
+          echo Did you forget to include the changed data files in this PR?
+          exit 1
+        fi