$ git clone -n https://src.fedoraproject.org/rpms/perl-XML-SAX-ExpatXS.git /var/lib/mock/f45-build-27543-624/root/chroot_tmpdir/scmroot/perl-XML-SAX-ExpatXS
Cloning into '/var/lib/mock/f45-build-27543-624/root/chroot_tmpdir/scmroot/perl-XML-SAX-ExpatXS'...
$ git fetch origin e6e86591a34185803cbe2878fb3fdb32e6d3c568:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-XML-SAX-ExpatXS
 * [new ref]         e6e86591a34185803cbe2878fb3fdb32e6d3c568 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e6e8659 Perl 5.44 rebuild