$ git clone -n https://src.fedoraproject.org/rpms/pam.git /var/lib/mock/f40-build-2704273-70926/root/chroot_tmpdir/scmroot/pam
Cloning into '/var/lib/mock/f40-build-2704273-70926/root/chroot_tmpdir/scmroot/pam'...
$ git fetch origin 95b8628f41f58c7e81f04372d39dd4e1aba1a4d4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/pam
 * [new ref]         95b8628f41f58c7e81f04372d39dd4e1aba1a4d4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 95b8628 Rebase to release 1.6.1