$ git clone -n https://src.fedoraproject.org/rpms/man-pages.git /var/lib/mock/f39-build-2160738-50946/root/chroot_tmpdir/scmroot/man-pages
Cloning into '/var/lib/mock/f39-build-2160738-50946/root/chroot_tmpdir/scmroot/man-pages'...
$ git fetch origin e91fe293d715a07632b274942c2adc5dfb906f88:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/man-pages
 * [new ref]         e91fe293d715a07632b274942c2adc5dfb906f88 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e91fe29 unix.7: SO_PEERCRED: Mention listen(2)