$ git clone -n https://src.fedoraproject.org/rpms/perl-XML-SAX-Base.git /var/lib/mock/f45-build-27540-624/root/chroot_tmpdir/scmroot/perl-XML-SAX-Base
Cloning into '/var/lib/mock/f45-build-27540-624/root/chroot_tmpdir/scmroot/perl-XML-SAX-Base'...
$ git fetch origin e487a785d91ba320ba105528696cda42b5085303:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-XML-SAX-Base
 * [new ref]         e487a785d91ba320ba105528696cda42b5085303 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e487a78 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild