This is a summary of the last few months of intermittent arguing over
the build system. I am glossing over most details as the specifics are
not important to the summary, and I'm too lazy to track down every post
on the matter.
Just before the 1.0 release Fred Wright submitted a patch to solve the
problem of waf installing python libraries in places that did not show
up in sys.path. This fix worked by checking sys.path to see if the
install path that python's distutils package returned was added, and if
not to install somewhere that was in sys.path at the time. The code had
a known issue with paths that didn't yet exist but would after the
install not being in sys.path. In practice the patch resulted in a
default install (/usr/local/) on some systems installing in /usr/,
violating the FHS in the process.
This spawned frequent intermittent arguments with the broad sides being
{better to have the import Just Work}, {violating FHS is unacceptable}.
Various other solutions were proposed or attempted, each one usually
breaking something else (often in a brittle way), each time this
happened it drew another person into the argument, peaking at 5 I
believe. Today (Jan 05, 2018) I ripped out fix_python_config.py, and
restored the warnings about PYTHONPATH. Here is my reasoning:
* The fix_python_config.py solution stomps on privileged directories at
times which cannot be predicted by the code. Even if the FHS did not
exist this would be very Bad Form Ol' Chap.
* The old way (now the current way) means that on some distributions the
user has to fiddle with their environment to add a .pth file or
PYTHONPATH. This is not good either, but it has zero chance of damaging
anything, anyone installing NTPsec is highly unlikely to have difficulty
with it, and the cherry on top is that serious issues are upstream's
problem to fix.
* .pth files are apparently not a solution that works generally, as well
as requiring modification of /usr/, thus violating FHS.
* Embedding the paths directly into the python programs works great, in
all situations. Right up until it doesn't. One problem is that the
Gentoo installation workflow is based around moving things around
temporary directories several times during the process. My initial
instinct upon seeing this fix was that it was horrible and brittle, but
I didn't think of the exact reason why and all the other solutions
seemed to be other forms of terrible so I went with it. I should have
trusted my instinct here.
TL;DR: we have gone back to the old way. If someone wants a better
solution feel free to propose it, *after* showing that it will not break
FHS, break if the user's assumptions are slightly different from ours,
or break because a feature is only available on a handful of systems.
--
/"In the end; what separates a Man, from a Slave? Money? Power? No. A
Man Chooses, a Slave Obeys."/ -- Andrew Ryan
/"Utopia cannot precede the Utopian. It will exist the moment we are fit
to occupy it."/ -- Sophia Lamb
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