`pythonOnBuildForHost` is already overriden when it is passed to
`passthruFun` remove redundant override. Performace is slightly better
~200MB less memory.
An attempt to address #338231. The current release of nixpkgs takes over
20GB of memory to evaluate python when the interpreter is overriden.
This adds memoization to the spliced python packages to avoid
evaluating all the commbinations of overrides.
Wrap each elements of disabledTests with parenthesis
so that when __structuredAttrs = true,
people could use sub-expressions an element.
E.g.
```nix
{
disabledTests = [
"ClassFoo and test_foo"
"test_bar"
];
}
Errors in Bash's process substitution doesn't get propagated outside.
Replace the process substitution with Python's `-` as /dev/stdin and
Bash's heredoc stdin redirection.
* util-linuxMinimal: build without pam and shadow
These depend on python via audit preventing the use of libuuid from
util-linux in python builds.
* cpython: provide libuuid for the _uuid module
Relying on libuuid offers synchronization primitives, so that "no two
processes can obtain the same UUID"¹.
[1] https://docs.python.org/3/library/uuid.html#module-uuid
The status quo of `bash` not being interactive is frustrating for many users,
because trying to use it interactively is just messed up, and
`bashInteractive` is not intuitive and barely discoverable.
This was brought to my (and many others) attention by @stahnma in his
[talk at CfgMgmtCamp 2025](https://cfp.cfgmgmtcamp.org/ghent2025/talk/YUVUTN/),
where he highlighted this as one of the frustrations he ran into when
learning Nix.
Why this is fine:
- No reason for not making interactive the default was given in the original commit (6c6ff6f36f), but probably it was due to the increase in closure size
- The closure size only increases by 6.9MiB (19.5%) today, with the
added dependency on the store paths for readline and ncurses, which
are needed on systems in almost all cases anyways
- If somebody really needs to get a more minimal system, they can use
the newly-introduced `bashNonInteractive` instead now
- Though to apply it consistently, they'll need to do that in an
overlay like
```
final: prev: {
bash = self.bashNonInteractive;
}
```
Or alternatively using the `system.replaceDependencies.replacements`
NixOS option approach.
While there's also other such `*Interactive` packages that could use the
same treatment, `bash` is a great start.
This was already attempted before in
https://github.com/NixOS/nixpkgs/pull/151227, but was not continued for
unknown reason.
To avoid stdenv becoming bigger, all uses of bash in the (working)
stdenv's are changed to the explicitly non-interactive version here.
This commit will however still cause a mass rebuild for all packages (and reverse deps)
making use of the default bash.
Silvan Mosberger