Re: [PATCH v3 5/5] Testing: provide tests requiring them with ellipses after SHA-1 values

"Philip Oakley" [off-list ref] writes:

quoted

We do not know until this change is released to the wild, at which
time we will hear noises about the lack of expected ellipses their
(poorly written) scripts rely on and tell them to set the workaround
environment variable.  We may not hear from such people at all, in
which case we may be able to remove it within a year or so, but it
is too early to tell.

I was wondering if there should be a small documentation change for
the env variable and states that it is a temporary measure for short
term compatibility. Though I'm not sure where the 'right' place would
be for it.

We list environment variables that applies git-wide in git(1), I
think.  If this is going to be only applicable for the "diff"
family, Documentation/diff-format.txt may be a better place, and
in that case the name of the environment variable may need to
include a word DIFF somewhere.