$ git clone -n https://src.fedoraproject.org/rpms/perl-Data-Peek.git /var/lib/mock/f41-build-816636-150311/root/chroot_tmpdir/scmroot/perl-Data-Peek
Cloning into '/var/lib/mock/f41-build-816636-150311/root/chroot_tmpdir/scmroot/perl-Data-Peek'...
$ git fetch origin d3b94661ca671fcc6b5049138a52967d3e73c209:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Data-Peek
 * [new ref]         d3b94661ca671fcc6b5049138a52967d3e73c209 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d3b9466 Perl 5.40 rebuild