$ git clone -n https://src.fedoraproject.org/rpms/perl-XML-Atom.git /var/lib/mock/f45-build-27413-624/root/chroot_tmpdir/scmroot/perl-XML-Atom
Cloning into '/var/lib/mock/f45-build-27413-624/root/chroot_tmpdir/scmroot/perl-XML-Atom'...
$ git fetch origin d197c47a3698e3c1972dd5b1594d4b7ab30e60c6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-XML-Atom
 * [new ref]         d197c47a3698e3c1972dd5b1594d4b7ab30e60c6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d197c47 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild