Introduce use_tzdata_update flag

icu.spec

@@ -1,18 +1,26 @@
 #%%global debugtrace 1
 
+# Set to 0 when upgrading to a new ICU release that contains up-to-date timezone data.
+# (or update the timezone data update..).
+%global use_tzdata_update 1
+# Adjust to version major; used in tzdata update.
+%global icu_major 69
+
 Name:      icu
 Version:   69.1
-Release:   4%{?dist}
+Release:   5%{?dist}
 Summary:   International Components for Unicode
 
 License:   MIT and UCD and Public Domain
 URL:       http://site.icu-project.org/
 Source0:   https://github.com/unicode-org/icu/releases/download/release-69-1/icu4c-69_1-src.tgz
+%if 0%{?use_tzdata_update}
 Source1:   https://github.com/unicode-org/icu/releases/download/release-69-1/icu4c-69_1-data.zip
 Source2:   https://raw.githubusercontent.com/unicode-org/icu-data/main/tzdata/icunew/2021a4/44/metaZones.txt
 Source3:   https://raw.githubusercontent.com/unicode-org/icu-data/main/tzdata/icunew/2021a4/44/timezoneTypes.txt
 Source4:   https://raw.githubusercontent.com/unicode-org/icu-data/main/tzdata/icunew/2021a4/44/windowsZones.txt
 Source5:   https://raw.githubusercontent.com/unicode-org/icu-data/main/tzdata/icunew/2021a4/44/zoneinfo64.txt
+%endif
 Source10:   icu-config.sh
 
 BuildRequires: gcc
@@ -64,11 +72,13 @@ BuildArch: noarch
 
 %prep
 %autosetup -p1 -n %{name}
+%if 0%{?use_tzdata_update}
 pushd source
 unzip -o %{SOURCE1}
-rm -f data/in/icudt69l.dat
+rm -f data/in/icudt%{icu_major}l.dat
 cp -v -f %{SOURCE2} %{SOURCE3} %{SOURCE4} %{SOURCE5} data/misc
 popd
+%endif
 
 %build
 pushd source
@@ -182,6 +192,9 @@ LD_LIBRARY_PATH=lib:stubdata:tools/ctestfw:$LD_LIBRARY_PATH bin/uconv -l
 
 
 %changelog
+* Wed Feb 02 2022 Eike Rathke <erack@redhat.com> - 69.1-5
+- Introduce use_tzdata_update flag
+
 * Tue Feb 01 2022 Mike FABIAN <mfabian@redhat.com> - 69.1-4
 - Update timezone data to 2021a4