$ git clone -n https://src.fedoraproject.org/rpms/perl-Devel-LexAlias.git /var/lib/mock/f41-build-816506-150225/root/chroot_tmpdir/scmroot/perl-Devel-LexAlias
Cloning into '/var/lib/mock/f41-build-816506-150225/root/chroot_tmpdir/scmroot/perl-Devel-LexAlias'...
$ git fetch origin eef31311b0fcfa9099ba7b3d045f6b6c8a797db6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Devel-LexAlias
 * [new ref]         eef31311b0fcfa9099ba7b3d045f6b6c8a797db6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at eef3131 Perl 5.40 rebuild