[Nut-upsdev] NUT on Windows revival

[Ted Mittelstaedt]

Am I correct in assuming this is all Win32 code still?

Ted

On 6/23/2022 2:52 PM, Jim Klimov via Nut-upsdev wrote:
> Hello all,
>
>   After a hectic month in private life, as a byproduct I've got a 
> viable merger of last released NUT 2.6.5 based Windows-ready codebase 
> (thanks to the giants active a dozen years ago, on whose shoulders I 
> stood today) and modern 2.8.x/master, fixing the merge conflicts and 
> build warnings. Some details were tracked in discussion of 
> https://github.com/networkupstools/nut/issues/5
>
>   There are caveats, e.g. in a few files code was just hidden by 
> `#ifndef WIN32` so making it "appear" would be a future trick, and 
> some "silly" fallbacks for missing methods were hacked to make it 
> build but probably are not thread-safe etc... but at least binaries do 
> appear and some do run without crashing on Windows - e.g. usbhid-ups 
> and nut-scanner did see my test UPS. Fixes originally made for 
> libusb-0.1 were applied to libusb1.c too, but not tried yet.
>
>   Builds are possible, mostly scripted and documented, see:
>
> * `docs/config-prereq.txt` and `ci_build.sh` for MSYS2 (includes 
> MinGW) natively on Windows,
> * `scripts/Windows/README` and a build script nearby for using mingw 
> cross-building packages on Ubuntu Linux.
>
> Both of these produce lots of standalone usable binaries installable 
> as a typical NUT directory tree, which (with copies of DLLs for 
> third-party projects) "just work".
>
> The adventure starts with:
>
> |:; git clone -b Windows-v2.8.0-1 
> https://github.com/networkupstools/nut nut-win |
> I really hope that the community members more interested and better 
> versed in the platform can pick it up from here, to discover and fix 
> the missing and flawed bits, make sense of the installer, etc. and 
> eventually make this codebase part of common NUT, multi-platform as it is.
>
> Sone points of interest OTOH:
> * c++ and a few drivers are currently effectively "neutered"
> * fcntl() code to avoid FD leaks to forked children, is it doable on 
> Windows?
> * loading dlls from one dir, without copies near every exe (see common.c)
> * automatically tracking major version number X (from 
> client/Makefile.am) for LTDL discovery of libupsclient-X.dll without 
> hardcoding it
> * localtime_r, gmtime_r use ugly fallbacks where unavoidable
> * usb close_dev() crashes
> * not all dependencies were tried, probably more build warnings are 
> lurking to clean up
> * installer not investigated
> * code mostly looks at "WIN32" macro as a big switch; there should be 
> more specific configure-script tests for different versions, toolkits, 
> build envs, IDEs... that are possible. Supported or not, WIN XP may 
> still be a big thing...
> * clean up what `make install` does (e.g. no systemd/SMF on win)
> * automate copying third-party dlls for `make install DESTDIR=...` 
> (recursive ldd?)
> * make sure that Linux/Mac/Solaris/BSD/... builds from this branch are 
> not broken by that big code merge.
>
> On my side, curiosity is satisfied, itch scratched and bogus 
> achievement achieved, so I plan to rest and then do other things. 
> Really looking forward to you the reader to make the next iterations.
>
> When this codebase gets "good enough" to at least not fail to build 
> against more and more third-party projects, I'll look at covering this 
> in NUT CI so it does not regress with future evolution. This milestone 
> is actually already viable now, just I'm leaving for vacation :-)
>
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