$ git clone -n https://src.fedoraproject.org/rpms/perl-Crypt-Curve25519.git /var/lib/mock/f45-build-22582-593/root/chroot_tmpdir/scmroot/perl-Crypt-Curve25519
Cloning into '/var/lib/mock/f45-build-22582-593/root/chroot_tmpdir/scmroot/perl-Crypt-Curve25519'...
$ git fetch origin fcf97135ba4c7a5b3eb2448a4a166140a1b2486b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Crypt-Curve25519
 * [new ref]         fcf97135ba4c7a5b3eb2448a4a166140a1b2486b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fcf9713 Perl 5.44 rebuild