$ git clone -n https://src.fedoraproject.org/rpms/mailimporter.git /var/lib/mock/f42-build-side-1-3586977-46927/root/chroot_tmpdir/scmroot/mailimporter
Cloning into '/var/lib/mock/f42-build-side-1-3586977-46927/root/chroot_tmpdir/scmroot/mailimporter'...
$ git fetch origin fa05537f7f98b73b6fad0329325c3dac16195906:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mailimporter
 * [new ref]         fa05537f7f98b73b6fad0329325c3dac16195906 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fa05537 25.04.3