also mark the sync version as NeverAsync. a blocking wait on sqlite
locks in a coroutine may never finish if it's a different coroutine
on the same executor that is holding the lock, not another process.
this propagates to the sqlite core interface, but no further. we'll
assume that caches do not block on a database for very long, and we
can't reasonably propagate never-async-ness out of stores unless we
touch everything we'd touch for the async transition, again, twice.
store code already assumes that it can block for however long it'll
feel like that moment. we keep thread pools around for this reason.
Change-Id: I62f77e1ac333cbe2e4e646dbcb1571463f2cf3fc
This adds a new temp-dir setting for controlling the temporary directory
without having to change the TMPDIR env var. This can be used to e.g.
use a path on a case-sensitive store on macOS for temporary files
without changing the TMPDIR var used by interactive shells or commands
invoked with `nix run`.
This also stops unsetting `TMPDIR` on darwin when the env var value
starts with `/var/folders/`, preferring instead to just do the check
when reading `TMPDIR`. This way the inherited `TMPDIR` env var is
preserved for child processes (such as interactive shells).
As a side effect this changes the behavior of `nix-build -o ''` to act
like `nix-build --no-out-link` instead of failing with an error caused
by trying to create a symlink at the cwd.
Fixes: https://git.lix.systems/lix-project/lix/issues/253
Fixes: https://git.lix.systems/lix-project/lix/issues/112
Change-Id: I9ee826323f2deca62854715a77ca7a373a948a29
Today, with the tests inside a `tests` intermingled with the
corresponding library's source code, we have a few problems:
- We have to be careful that wildcards don't end up with tests being
built as part of Nix proper, or test headers being installed as part
of Nix proper.
- Tests in libraries but not executables is not right:
- It means each executable runs the previous unit tests again, because
it needs the libraries.
- It doesn't work right on Windows, which doesn't want you to load a
DLL just for the side global variable . It could be made to work
with the dlopen equivalent, but that's gross!
This reorg solves these problems.
There is a remaining problem which is that sibbling headers (like
`hash.hh` the test header vs `hash.hh` the main `libnixutil` header) end
up shadowing each other. This PR doesn't solve that. That is left as
future work for a future PR.
Co-authored-by: Valentin Gagarin <valentin.gagarin@tweag.io>
(cherry picked from commit 91b6833686a6a6d9eac7f3f66393ec89ef1d3b57)
(cherry picked from commit a61e42adb528b3d40ce43e07c79368d779a8b624)
eldritch horrors