License compliance when shipping cygwin binaries

[Stefan Baur <X2Go-ML-1@baur-itcs.de>]

Hi List,

I would like to bundle and ship an executable found in Cygwin and the
DLLs it requires. The files in question are:

chgrp.exe
cyggcc_s-1.dll
cygiconv-2.dll
cygintl-8.dll
cygwin1.dll

For which of these files do I have to ship the source code to comply
with the license, and what's the easiest way to get hold of it myself?
(i.e. do I have to do a full cygwin install and select "source" on
$PACKAGE, then pick the source files from there, or is there a git repo
or similar that I could clone?)

The way I understand <https://cygwin.com/licensing.html>, I don't need
the source for cygwin1.dll (please correct me if I'm wrong).  But what
about the other DLLs, and what about chgrp.exe itself?
I believe chgrp is under GPL, but I'm at loss whether there is a special
"cygwin chgrp" repo, or whether the regular chgrp source
(<http://git.savannah.gnu.org/gitweb/?p=coreutils.git>, I assume?) is
used, and how to fetch the source for exactly the binary I intend to ship.

Could anyone please enlighten me?

Kind Regards,
Stefan Baur

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