$ git clone -n https://src.fedoraproject.org/rpms/perl-Tk-ColoredButton.git /var/lib/mock/f45-build-27145-621/root/chroot_tmpdir/scmroot/perl-Tk-ColoredButton
Cloning into '/var/lib/mock/f45-build-27145-621/root/chroot_tmpdir/scmroot/perl-Tk-ColoredButton'...
$ git fetch origin 753b8fe3cb4c8afc1659c9a0c4659606cc482cc6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Tk-ColoredButton
 * [new ref]         753b8fe3cb4c8afc1659c9a0c4659606cc482cc6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 753b8fe Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild