$ git clone -n https://src.fedoraproject.org/rpms/rust-sval_derive.git /var/lib/mock/f39-build-1876454-42739/root/chroot_tmpdir/scmroot/rust-sval_derive
Cloning into '/var/lib/mock/f39-build-1876454-42739/root/chroot_tmpdir/scmroot/rust-sval_derive'...
$ git fetch origin 37f76d2d75a43239a602670ccf3500e1ac9187c8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-sval_derive
 * [new ref]         37f76d2d75a43239a602670ccf3500e1ac9187c8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 37f76d2 Update to version 2.10.2; Fixes RHBZ#2239966