$ git clone -n https://src.fedoraproject.org/rpms/perl-Crypt-DH-GMP.git /var/lib/mock/f45-build-22602-593/root/chroot_tmpdir/scmroot/perl-Crypt-DH-GMP
Cloning into '/var/lib/mock/f45-build-22602-593/root/chroot_tmpdir/scmroot/perl-Crypt-DH-GMP'...
$ git fetch origin 16f466ae0f23c23c0701b448c611a58cb1aa237b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Crypt-DH-GMP
 * [new ref]         16f466ae0f23c23c0701b448c611a58cb1aa237b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 16f466a Perl 5.44 rebuild