$ git clone -n https://src.fedoraproject.org/rpms/perl-Syntax-Operator-In.git /var/lib/mock/f41-build-1146578-21197/root/chroot_tmpdir/scmroot/perl-Syntax-Operator-In
Cloning into '/var/lib/mock/f41-build-1146578-21197/root/chroot_tmpdir/scmroot/perl-Syntax-Operator-In'...
$ git fetch origin f7a667595004d9c23312693043b8c60c6dd261c9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Syntax-Operator-In
 * [new ref]         f7a667595004d9c23312693043b8c60c6dd261c9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f7a6675 Perl 5.40 rebuild