$ git clone -n https://src.fedoraproject.org/rpms/rust-webbrowser.git /var/lib/mock/f39-build-1489326-34501/root/chroot_tmpdir/scmroot/rust-webbrowser
Cloning into '/var/lib/mock/f39-build-1489326-34501/root/chroot_tmpdir/scmroot/rust-webbrowser'...
$ git fetch origin 3d63a9d69f75572bf35d37209476bd737c4826d0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-webbrowser
 * [new ref]         3d63a9d69f75572bf35d37209476bd737c4826d0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3d63a9d Regenerate with rust2rpm v24