$ git clone -n https://src.fedoraproject.org/rpms/rust-gdk-sys0.16.git /var/lib/mock/f38-build-side-43-rust-devel-1411351-31432/root/chroot_tmpdir/scmroot/rust-gdk-sys0.16
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1411351-31432/root/chroot_tmpdir/scmroot/rust-gdk-sys0.16'...
$ git fetch origin a25c5d3583880bf96af8f78eeaa7c737f4d1c1e6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gdk-sys0.16
 * [new ref]         a25c5d3583880bf96af8f78eeaa7c737f4d1c1e6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a25c5d3 Initial import (gdk-sys 0.16 compat package)