$ git clone -n https://git.centos.org/git/rpms/tzdata.git /var/lib/mock/storage7-el7-build-17-14/root/tmp/scmroot/tzdata
Initialized empty Git repository in /var/lib/mock/storage7-el7-build-17-14/root/tmp/scmroot/tzdata/.git/
$ git reset --hard HEAD
HEAD is now at 827de07 init git for tzdata