$ git clone -n https://src.fedoraproject.org/rpms/rust-gobject-sys0.16.git /var/lib/mock/f38-build-side-42-init-devel-1393584-31050/root/chroot_tmpdir/scmroot/rust-gobject-sys0.16
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1393584-31050/root/chroot_tmpdir/scmroot/rust-gobject-sys0.16'...
$ git fetch origin b3226817a0163586c5c741997f564601c7d81a89:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gobject-sys0.16
 * [new ref]         b3226817a0163586c5c741997f564601c7d81a89 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b322681 Initial import (gobject-sys 0.16 compat package)