$ git clone -n https://src.fedoraproject.org/rpms/perl-Crypt-Blowfish.git /var/lib/mock/f45-build-22578-593/root/chroot_tmpdir/scmroot/perl-Crypt-Blowfish
Cloning into '/var/lib/mock/f45-build-22578-593/root/chroot_tmpdir/scmroot/perl-Crypt-Blowfish'...
$ git fetch origin 4d64b89901d17bf6283ba39e2f7528ba4afc0293:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Crypt-Blowfish
 * [new ref]         4d64b89901d17bf6283ba39e2f7528ba4afc0293 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4d64b89 Perl 5.44 rebuild