$ git clone -n https://src.fedoraproject.org/rpms/perl-Test-Bits.git /var/lib/mock/f45-build-26610-618/root/chroot_tmpdir/scmroot/perl-Test-Bits
Cloning into '/var/lib/mock/f45-build-26610-618/root/chroot_tmpdir/scmroot/perl-Test-Bits'...
$ git fetch origin c291bbda8665f451bed101c4ba5cd294f8c09e1d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Test-Bits
 * [new ref]         c291bbda8665f451bed101c4ba5cd294f8c09e1d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c291bbd Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild