$ git clone -n https://src.fedoraproject.org/rpms/rust-sval_json.git /var/lib/mock/f38-build-side-42-init-devel-1390888-30718/root/chroot_tmpdir/scmroot/rust-sval_json
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1390888-30718/root/chroot_tmpdir/scmroot/rust-sval_json'...
$ git fetch origin e5fe77c329539bb16d64baad98f64577b60f2e7d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-sval_json
 * [new ref]         e5fe77c329539bb16d64baad98f64577b60f2e7d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e5fe77c Update to version 2.6.1; Fixes RHBZ#2181435