$ git clone -n https://src.fedoraproject.org/rpms/rust-scoped_threadpool.git /var/lib/mock/f45-build-44708-816/root/chroot_tmpdir/scmroot/rust-scoped_threadpool
Cloning into '/var/lib/mock/f45-build-44708-816/root/chroot_tmpdir/scmroot/rust-scoped_threadpool'...
$ git fetch origin 3f57a78af10295c27b9715a9b7cc517e93dc99d1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-scoped_threadpool
 * [new ref]         3f57a78af10295c27b9715a9b7cc517e93dc99d1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3f57a78 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild