$ git clone -n https://src.fedoraproject.org/rpms/perl-Crypt-OpenSSL-RSA.git /var/lib/mock/f42-build-side-1-3533235-46361/root/chroot_tmpdir/scmroot/perl-Crypt-OpenSSL-RSA
Cloning into '/var/lib/mock/f42-build-side-1-3533235-46361/root/chroot_tmpdir/scmroot/perl-Crypt-OpenSSL-RSA'...
$ git fetch origin 4def4a82a283f6d17c3926ba783044e5d5259e3a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Crypt-OpenSSL-RSA
 * [new ref]         4def4a82a283f6d17c3926ba783044e5d5259e3a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4def4a8  Update to 0.35 (RHBZ#2364877)