$ git clone -n https://src.fedoraproject.org/rpms/perl-String-Util.git /var/lib/mock/f45-build-26369-617/root/chroot_tmpdir/scmroot/perl-String-Util
Cloning into '/var/lib/mock/f45-build-26369-617/root/chroot_tmpdir/scmroot/perl-String-Util'...
$ git fetch origin ea1aef3cc795624b30eac7fae748c09b4cf87f29:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-String-Util
 * [new ref]         ea1aef3cc795624b30eac7fae748c09b4cf87f29 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ea1aef3 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild