$ git clone -n https://src.fedoraproject.org/rpms/rust-gdk.git /var/lib/mock/f38-build-side-43-rust-devel-1404116-31200/root/chroot_tmpdir/scmroot/rust-gdk
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1404116-31200/root/chroot_tmpdir/scmroot/rust-gdk'...
$ git fetch origin fe34f30ce8e261a09e29b31fb07fec1f2395a93a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gdk
 * [new ref]         fe34f30ce8e261a09e29b31fb07fec1f2395a93a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fe34f30 Update to version 0.18.0; Fixes RHBZ#2231716