$ git clone -n https://src.fedoraproject.org/rpms/perl-HTTP-Body.git /var/lib/mock/f45-build-23980-601/root/chroot_tmpdir/scmroot/perl-HTTP-Body
Cloning into '/var/lib/mock/f45-build-23980-601/root/chroot_tmpdir/scmroot/perl-HTTP-Body'...
$ git fetch origin d1672dd5178c06abfc000194c67a37db647b6f37:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-HTTP-Body
 * [new ref]         d1672dd5178c06abfc000194c67a37db647b6f37 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d1672dd Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild