$ git clone -n https://src.fedoraproject.org/rpms/perl-B-Compiling.git /var/lib/mock/f45-build-21804-588/root/chroot_tmpdir/scmroot/perl-B-Compiling
Cloning into '/var/lib/mock/f45-build-21804-588/root/chroot_tmpdir/scmroot/perl-B-Compiling'...
$ git fetch origin da34501cc2fe849dc5f6b753e663fbe5103ae730:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-B-Compiling
 * [new ref]         da34501cc2fe849dc5f6b753e663fbe5103ae730 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at da34501 Perl 5.44 rebuild