$ git clone -n https://src.fedoraproject.org/rpms/perl-Package-Anon.git /var/lib/mock/f45-build-25607-612/root/chroot_tmpdir/scmroot/perl-Package-Anon
Cloning into '/var/lib/mock/f45-build-25607-612/root/chroot_tmpdir/scmroot/perl-Package-Anon'...
$ git fetch origin 79bd30be30e4fdc45614b95407712cc2e09316f2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Package-Anon
 * [new ref]         79bd30be30e4fdc45614b95407712cc2e09316f2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 79bd30b Perl 5.44 rebuild