$ git clone -n https://src.fedoraproject.org/rpms/rust-ego-tree.git /var/lib/mock/f45-build-41402-782/root/chroot_tmpdir/scmroot/rust-ego-tree
Cloning into '/var/lib/mock/f45-build-41402-782/root/chroot_tmpdir/scmroot/rust-ego-tree'...
$ git fetch origin 8b16fbfc348e81ce536cfc59c10f7327dfce1021:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-ego-tree
 * [new ref]         8b16fbfc348e81ce536cfc59c10f7327dfce1021 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8b16fbf Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild