$ git clone -n https://src.fedoraproject.org/rpms/perl-IO-AIO.git /var/lib/mock/f43-perl-60949743-6586659/root/chroot_tmpdir/scmroot/perl-IO-AIO
Cloning into '/var/lib/mock/f43-perl-60949743-6586659/root/chroot_tmpdir/scmroot/perl-IO-AIO'...
$ git fetch origin 7a9b1999d229703f4db77ac232653b344c155b25:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-IO-AIO
 * [new ref]         7a9b1999d229703f4db77ac232653b344c155b25 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7a9b199 Perl 5.42 rebuild