$ git clone -n https://src.fedoraproject.org/rpms/perl-Test-Signature.git /var/lib/mock/f45-build-26849-619/root/chroot_tmpdir/scmroot/perl-Test-Signature
Cloning into '/var/lib/mock/f45-build-26849-619/root/chroot_tmpdir/scmroot/perl-Test-Signature'...
$ git fetch origin 665b171e1f17eebd3f23253c0a1408347a17f5ba:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Test-Signature
 * [new ref]         665b171e1f17eebd3f23253c0a1408347a17f5ba -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 665b171 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild