$ git clone -n https://src.fedoraproject.org/rpms/perl-HTTP-CookieJar.git /var/lib/mock/f45-build-23988-601/root/chroot_tmpdir/scmroot/perl-HTTP-CookieJar
Cloning into '/var/lib/mock/f45-build-23988-601/root/chroot_tmpdir/scmroot/perl-HTTP-CookieJar'...
$ git fetch origin bfd8f6110e81e330b8a21ef1887d8e3df9fdf4b9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-HTTP-CookieJar
 * [new ref]         bfd8f6110e81e330b8a21ef1887d8e3df9fdf4b9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bfd8f61 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild