$ git clone -n https://src.fedoraproject.org/rpms/rust-tree-house.git /var/lib/mock/f45-build-45618-824/root/chroot_tmpdir/scmroot/rust-tree-house
Cloning into '/var/lib/mock/f45-build-45618-824/root/chroot_tmpdir/scmroot/rust-tree-house'...
$ git fetch origin 15942e72b45cb8be9c9b537cbaeae90ff44430da:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-tree-house
 * [new ref]         15942e72b45cb8be9c9b537cbaeae90ff44430da -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 15942e7 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild