$ git clone -n https://src.fedoraproject.org/rpms/rust-async-fs.git /var/lib/mock/f39-build-2240587-53642/root/chroot_tmpdir/scmroot/rust-async-fs
Cloning into '/var/lib/mock/f39-build-2240587-53642/root/chroot_tmpdir/scmroot/rust-async-fs'...
$ git fetch origin 3b6166a05a60acc6555ffaae97673bf189b61b60:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-async-fs
 * [new ref]         3b6166a05a60acc6555ffaae97673bf189b61b60 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3b6166a Update to version 2.1.0; Fixes RHBZ#2244762