Re: [PATCH 2/2] add--interactive.perl: specify --no-color explicitly

Jeff King [off-list ref] writes:

By the way, this is an instance of a more generic bug, which is that:

  git -p my-script

will cause any sub-programs of git-my-script to think their stdout is
going to a pager, even if my-script redirects them to a file or another
pipe.

I had a solution long ago in:

  https://lore.kernel.org/git/20150810052353.GB15441@sigill.intra.peff.net/ (local)

but it raises a bunch of interesting portability questions. Since this
comes up so rarely, I never really pursued it further.

That indeed is from long ago ;-) and I still kind of like it.  Is
the issue that some platforms do not even have inum of the "thing"
connected to a file descriptor?  I think a fallback code for such a
system can just return a constant pipe ID to anybody asks, so that
an exported GIT_PAGER_PIPE_ID would always match, which gives the
behaviour identical to what we currently do with GIT_PAGER_IN_USE,
and that would be one way to help those capable of giving useful IDs
while not harming others.

Thanks.