$ git clone -n https://src.fedoraproject.org/rpms/perl-Crypt-OpenSSL-Bignum.git /var/lib/mock/f45-build-22593-593/root/chroot_tmpdir/scmroot/perl-Crypt-OpenSSL-Bignum
Cloning into '/var/lib/mock/f45-build-22593-593/root/chroot_tmpdir/scmroot/perl-Crypt-OpenSSL-Bignum'...
$ git fetch origin 6f629b96972fe5d3e0732e29ebf840b3b3c401d9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Crypt-OpenSSL-Bignum
 * [new ref]         6f629b96972fe5d3e0732e29ebf840b3b3c401d9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6f629b9 Perl 5.44 rebuild