$ git clone -n https://src.fedoraproject.org/rpms/perl-Alien-autoconf.git /var/lib/mock/f45-build-21649-587/root/chroot_tmpdir/scmroot/perl-Alien-autoconf
Cloning into '/var/lib/mock/f45-build-21649-587/root/chroot_tmpdir/scmroot/perl-Alien-autoconf'...
$ git fetch origin b532ea46a6ffa242efa9e1455a6d1e052a14478f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Alien-autoconf
 * [new ref]         b532ea46a6ffa242efa9e1455a6d1e052a14478f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b532ea4 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild