Re: segfault tied to "IS JSON predicate" commit

On Sat, Apr 15, 2023 at 2:46 PM Justin Pryzby <pryzby@telsasoft.com> wrote:
> I think what happened is that you (and I) are in the habbit of running
> "meson test tmp_install" to compile new binaries and install them into
> ./tmp_install, and then run a server out from there.

That's not my habit; this is running against a server that was
installed into a dedicated install directory. Though I agree that an
issue with the environment seems likely.

> But nowadays
> there's also "meson test install_test_files".

That only applies with "--setup tmp_install", which is the default
test setup, and the one that you must be using implicitly. But I'm
using "--setup running" for this.

More concretely, the tmp_install setup has the tests you say are requirements:

$ meson test --setup tmp_install --list | grep install
postgresql:setup / tmp_install
postgresql:setup / install_test_files

But not the running setup:

$ meson test --setup running --list | grep install | wc -l
0

I'm aware of the requirement around specifying "--suite tmp_install
..." right before "... --suite what_i_really_want_to_test" is
specified. However, I can't see how it could be my fault for
forgetting that, since it's structurally impossible to specify
"--suite tmp_install" when using "--setup running". I was using the
setup that gives you behavior that's approximately equivalent to "make
installcheck" (namely "--setup running"), so naturally this would have
been impossible.

Let's review:

* There are two possible --setup modes. I didn't use the default
(which is "--setup tmp_install") here. Rather, I used "--setup
running", which is kinda like "make installcheck".

* There is a test suite named "setup", though it's only available with
"--setup tmp_install", the default setup. (This is not to be confused
with the meson-specific notion of a --setup.)

* The "setup" suite happens to contain an individual test called
"tmp_install"  (as well as one called "install_test_files")

* I cannot possibly have forgotten this, since asking for it with
"--setup running" just doesn't work.

Let's demonstrate what I mean. The following does not and cannot
work, so I cannot have forgotten to do it in any practical sense:

$ meson test --setup running postgresql:setup / tmp_install
ninja: no work to do.
No suitable tests defined.

Such an incantation can only be expected to work with --setup tmp_install, the
default. So this version does work:

$ meson test --setup tmp_install postgresql:setup / tmp_install
**SNIP**
1/1 postgresql:setup / tmp_install        OK               0.72s
**SNIP**

Not confusing at all!

--
Peter Geoghegan