$ git clone -n https://src.fedoraproject.org/rpms/perl-Net-Ping-External.git /var/lib/mock/f45-build-25344-610/root/chroot_tmpdir/scmroot/perl-Net-Ping-External
Cloning into '/var/lib/mock/f45-build-25344-610/root/chroot_tmpdir/scmroot/perl-Net-Ping-External'...
$ git fetch origin b00577f092dff03fcb367b2d6ffcba891fbd6101:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Net-Ping-External
 * [new ref]         b00577f092dff03fcb367b2d6ffcba891fbd6101 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b00577f Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild