$ git clone -n https://src.fedoraproject.org/rpms/rust-sval_dynamic.git /var/lib/mock/f39-build-2111502-50664/root/chroot_tmpdir/scmroot/rust-sval_dynamic
Cloning into '/var/lib/mock/f39-build-2111502-50664/root/chroot_tmpdir/scmroot/rust-sval_dynamic'...
$ git fetch origin c8d3109b245c3e6281bed82d1267e8c7963d84fc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-sval_dynamic
 * [new ref]         c8d3109b245c3e6281bed82d1267e8c7963d84fc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c8d3109 Update to version 2.10.2; Fixes RHBZ#2239959