$ git clone -n https://src.fedoraproject.org/rpms/perl-Crypt-U2F-Server.git /var/lib/mock/f45-build-22660-593/root/chroot_tmpdir/scmroot/perl-Crypt-U2F-Server
Cloning into '/var/lib/mock/f45-build-22660-593/root/chroot_tmpdir/scmroot/perl-Crypt-U2F-Server'...
$ git fetch origin afe9b001e16328082ee239f97cb40de258261962:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Crypt-U2F-Server
 * [new ref]         afe9b001e16328082ee239f97cb40de258261962 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at afe9b00 Perl 5.44 rebuild