$ git clone -n https://src.fedoraproject.org/rpms/perl-Test-Requires.git /var/lib/mock/f45-build-26823-619/root/chroot_tmpdir/scmroot/perl-Test-Requires
Cloning into '/var/lib/mock/f45-build-26823-619/root/chroot_tmpdir/scmroot/perl-Test-Requires'...
$ git fetch origin 45117264d8db62b31ed7cb8cd73753c33f41aa7a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Test-Requires
 * [new ref]         45117264d8db62b31ed7cb8cd73753c33f41aa7a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4511726 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild