$ git clone -n https://src.fedoraproject.org/rpms/rust-h3.git /var/lib/mock/f45-build-42244-791/root/chroot_tmpdir/scmroot/rust-h3
Cloning into '/var/lib/mock/f45-build-42244-791/root/chroot_tmpdir/scmroot/rust-h3'...
$ git fetch origin 6cb843e84d63c156ba04f5a001d7c879fc0349f7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-h3
 * [new ref]         6cb843e84d63c156ba04f5a001d7c879fc0349f7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6cb843e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild