$ git clone -n https://src.fedoraproject.org/rpms/rust-tokio-test.git /var/lib/mock/f40-build-2084048-49984/root/chroot_tmpdir/scmroot/rust-tokio-test
Cloning into '/var/lib/mock/f40-build-2084048-49984/root/chroot_tmpdir/scmroot/rust-tokio-test'...
$ git fetch origin 5441aa7914c22f77e91230038010f06f0c8178b4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-tokio-test
 * [new ref]         5441aa7914c22f77e91230038010f06f0c8178b4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5441aa7 Update to version 0.4.3; Fixes RHBZ#2233780