$ git clone -n https://src.fedoraproject.org/rpms/rust-libslirp.git /var/lib/mock/f39-build-1637858-40021/root/chroot_tmpdir/scmroot/rust-libslirp
Cloning into '/var/lib/mock/f39-build-1637858-40021/root/chroot_tmpdir/scmroot/rust-libslirp'...
$ git fetch origin 20e91a0d9910610d7a7a81e00f0054af3c2d73e7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-libslirp
 * [new ref]         20e91a0d9910610d7a7a81e00f0054af3c2d73e7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 20e91a0 Regenerate with rust2rpm v24; allow libsystemd versions 0.2..0.5