$ git clone -n https://src.fedoraproject.org/rpms/perl-String-Copyright.git /var/lib/mock/f45-build-26275-616/root/chroot_tmpdir/scmroot/perl-String-Copyright
Cloning into '/var/lib/mock/f45-build-26275-616/root/chroot_tmpdir/scmroot/perl-String-Copyright'...
$ git fetch origin 54bc6fdb15406ea81fc8f6b406359b259ad1e75b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-String-Copyright
 * [new ref]         54bc6fdb15406ea81fc8f6b406359b259ad1e75b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 54bc6fd Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild