$ git clone -n https://src.fedoraproject.org/rpms/perl-File-Map.git /var/lib/mock/f45-build-23597-598/root/chroot_tmpdir/scmroot/perl-File-Map
Cloning into '/var/lib/mock/f45-build-23597-598/root/chroot_tmpdir/scmroot/perl-File-Map'...
$ git fetch origin c2812f9bfbd8c66bcb3a0e18ac587e84a635c1da:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-File-Map
 * [new ref]         c2812f9bfbd8c66bcb3a0e18ac587e84a635c1da -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c2812f9 Perl 5.44 rebuild