$ git clone -n https://src.fedoraproject.org/rpms/rust-glib.git /var/lib/mock/f42-build-side-1-3569822-46748/root/chroot_tmpdir/scmroot/rust-glib
Cloning into '/var/lib/mock/f42-build-side-1-3569822-46748/root/chroot_tmpdir/scmroot/rust-glib'...
$ git fetch origin a8fd598437aeae0571d6c9ee0c3710ada03ee3b9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-glib
 * [new ref]         a8fd598437aeae0571d6c9ee0c3710ada03ee3b9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a8fd598 Update to version 0.20.10; Fixes RHBZ#2365830