$ git clone -n https://src.fedoraproject.org/rpms/rust-glib.git /var/lib/mock/f42-build-side-1-3585412-46904/root/chroot_tmpdir/scmroot/rust-glib
Cloning into '/var/lib/mock/f42-build-side-1-3585412-46904/root/chroot_tmpdir/scmroot/rust-glib'...
$ git fetch origin 582a7541740fd2c07500e561f07a758fbeb64cc6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-glib
 * [new ref]         582a7541740fd2c07500e561f07a758fbeb64cc6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 582a754 Update to version 0.20.12