$ git clone -n https://src.fedoraproject.org/rpms/rust-tester.git /var/lib/mock/f45-build-45397-822/root/chroot_tmpdir/scmroot/rust-tester
Cloning into '/var/lib/mock/f45-build-45397-822/root/chroot_tmpdir/scmroot/rust-tester'...
$ git fetch origin 237ecb80680954d3b3cf07d56c612af7a8b743f1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-tester
 * [new ref]         237ecb80680954d3b3cf07d56c612af7a8b743f1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 237ecb8 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild