Replacing gkermit with ekermit

[Alan Barrett <apb%netbsd.org@localhost>]

I would like to remove gkermit (GPLv2) and add a BSD-licenced 
kermit implementation such as E-Kermit (very small, see 
<http://www.kermitproject.org/ek.html>) or C-Kermit (much larger, 
see <http://www.kermitproject.org/ck90.html>).  Read on for 
details.

In 2006, we imported the "gkermit" program, which is a lightweight 
implementation of the Kermit file transfer protocol, with a 
GPLv2 licence.  This was intended to be useful for transferring 
files over a console port to aid in system recovery.  It was 
even added to /rescue because of its usefulness in system 
recovery, but was then removed due to licencing concrns.  See 
<http://mail-index.netbsd.org/tech-userlevel/2006/10/29/0020.html> 
for an example of a use case for a small Kermit 
implementation in the base system and in /rescue, 
and search for "gkermit" in the index page at 
<http://mail-index.netbsd.org/tech-userlevel/2006/10/oindex.html> 
to find other other messages in the discussion from 2006.

At that time (2006), most Kermit implementations had a licence 
that prohibited copying for commercial use, but C-Kermit had a 
licence exemption that allowed inclusion in a "Free UNIX" or 
other Open Source operating-system distribution, and gkermit had 
a GPL licence.  The C-Kermit licence would not not have allowed 
inclusion in products shipped by vendors who use NetBSD, so (back 
in 1999 when Columbia University added the licence exemption) 
NetBSD chose not to include C-Kermit.

In 2011, Columbia University re-licenced most Kermit 
implementations under a revised 3-clause BSD licence, 
terminated their Kermit project, and transferred 
Kermit development to an open source project.  See 
<http://www.columbia.edu/kermit/index.html>.

Today, gkermit remains under a GPLv2 licence, while the very small 
E-Kermit and the much larger C-Kermit have BSD licences.

E-Kermit (see <http://www.kermitproject.org/ek.html>) is 
intended as a small library for embedding in other programs or 
products, but it has a simple commandline wrapper.  C-Kermit (see 
<http://www.kermitproject.org/ck90.html>) has many more features 
and an interactive user interface.

I would like to replace the small GPL-licenced gkermit in the 
NetBSD base system with the small BSD-licenced E-Kermit.  E-Kermit 
can also be added to /rescue without any licencing concerns. 
Users who want all the extra features in C-Kermit may install 
it from pkgsrc, while users who need only a minimalistic file 
transfer facility may use ekermit in the base system.

I have already done most of the work that would be required to 
import E-Kermit; it was just a reachiver Makefile and a few small 
patches to silence compiler warnings.

I could possibly be persuaded to import C-Kermit instead of 
E-Kermit, but I have not even looked at how difficult that might 
be.

--apb (Alan Barrett)