$ git clone -n https://src.fedoraproject.org/rpms/perl-Alien-pkgconf.git /var/lib/mock/f45-build-21625-587/root/chroot_tmpdir/scmroot/perl-Alien-pkgconf
Cloning into '/var/lib/mock/f45-build-21625-587/root/chroot_tmpdir/scmroot/perl-Alien-pkgconf'...
$ git fetch origin ca46ca4de6d5b3ae4fd62a313995b62781b95f66:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Alien-pkgconf
 * [new ref]         ca46ca4de6d5b3ae4fd62a313995b62781b95f66 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ca46ca4 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild