$ git clone -n https://src.fedoraproject.org/rpms/xfce4-mailwatch-plugin.git /var/lib/mock/f41-build-side-1-2826639-33435/root/chroot_tmpdir/scmroot/xfce4-mailwatch-plugin
Cloning into '/var/lib/mock/f41-build-side-1-2826639-33435/root/chroot_tmpdir/scmroot/xfce4-mailwatch-plugin'...
$ git fetch origin befde725ee8ab3a2371086e3755c09d2c0c624c3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xfce4-mailwatch-plugin
 * [new ref]         befde725ee8ab3a2371086e3755c09d2c0c624c3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at befde72 convert GPLv2 license to SPDX