$ git clone -n https://src.fedoraproject.org/rpms/rust-sval_derive.git /var/lib/mock/f41-build-side-1-3134933-39764/root/chroot_tmpdir/scmroot/rust-sval_derive
Cloning into '/var/lib/mock/f41-build-side-1-3134933-39764/root/chroot_tmpdir/scmroot/rust-sval_derive'...
$ git fetch origin dce2fbb254a84cc9323d1f6338ec105567f2eece:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-sval_derive
 * [new ref]         dce2fbb254a84cc9323d1f6338ec105567f2eece -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dce2fbb no longer needed