$ git clone -n https://src.fedoraproject.org/rpms/rust-gvdb.git /var/lib/mock/f39-build-2254020-54222/root/chroot_tmpdir/scmroot/rust-gvdb
Cloning into '/var/lib/mock/f39-build-2254020-54222/root/chroot_tmpdir/scmroot/rust-gvdb'...
$ git fetch origin 5896038180ded05398675964793dd3305aa0283e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gvdb
 * [new ref]         5896038180ded05398675964793dd3305aa0283e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5896038 Update to version 0.5.3; Fixes RHBZ#2252594