$ git clone -n https://src.fedoraproject.org/rpms/rust-ghost.git /var/lib/mock/f39-build-2186480-51357/root/chroot_tmpdir/scmroot/rust-ghost
Cloning into '/var/lib/mock/f39-build-2186480-51357/root/chroot_tmpdir/scmroot/rust-ghost'...
$ git fetch origin ff3d8e12d141fff1e5c6e955982a9d5370fb942a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-ghost
 * [new ref]         ff3d8e12d141fff1e5c6e955982a9d5370fb942a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ff3d8e1 Update to version 0.1.17; Fixes RHBZ#2256425