After fetching a package and applying the filter by deleting files that
are not part of the hash, creates a recompressed $GLOBAL_CACHE/p/$PKG_HASH.tar.gz
Checking this cache before fetching network URLs is not yet implemented.
Changes an assert back into a conditional to match the behavior of `getPosix`, see https://codeberg.org/ziglang/zig/pulls/31113#issuecomment-10371698 and https://github.com/ziglang/zig/issues/23331.
Note: the conditional has been updated to also return null early on 0-length key lookups, since there's no need to iterate the block in that case.
For `Environ.Map`, validation of keys has been split into two categories: 'put' and 'fetch', each of which are tailored to the constraints that the implementation actually relies upon. Specifically:
- Hashing (fetching) requires the keys to be valid WTF-8 on Windows, but does not rely on any other properties of the keys (attempting to fetch `F\x00=` is not a problem, it just won't be found)
- `create{Posix,Windows}Block` relies on the Map to always have fully valid keys (no NUL, no `=` in an invalid location, no zero-length keys), which means that the 'put' APIs need to validate that incoming keys adhere to those properties.
The relevant assertions are now documented on each of the Map functions.
Also reinstates some test cases in the `env_vars` standalone test. Some of the reinstated tests are effectively just testing the Environ.Map implementation due to how `Environ.contains`, `Environ.getAlloc`, etc are implemented, but that is not inherent to those functions so the tests are still potentially relevant if e.g. `contains` is implemented in terms of `getPosix`/`getWindows` in the future (which is totally possible and maybe a good idea since constructing the whole map is not necessary for looking up one key).
Replaced by the lockStderr functions of std.Io. Trying to make
`std.process.stderr_thread_mutex` be a bridge across different Io
implementations didn't work in practice.
We can't use Io.Mutex in parking_futex; instead, we need a simple
parking-based mutex implementation. That's fairly simple to do.
Also deal with spurious unparks on NetBSD, where they *can* happen (as
opposed to Windows, where they cannot).
It turns out that at least on Windows, spurious unparks are *not*
possible, and in fact triggering them breaks some RTL synchronization
primitives. For instance, if you have a pending unpark going into a
contended `RtlEnterCriticalSection` call, it will never unblock. In
other words, the Windows API worked exactly how I thought it did, and
it's only the NetBSD/Illumos one which is dumb. This is actually exactly
why Windows 8 introduced the parking API despite alertable sleeps being
a thing!
This commit doesn't yet deal with making NetBSD work, nor does it even
compile I imagine. The next commit will fix everything back up.
This reverts commit c518593e97.
Andrew Kelley