This replicates behaviour found in the Nix2 commands, where IN_NIX_SHELL
is set. This is for shells to determine whether they are inside of a
Nix3 shell, and set a custom prompt accordingly.
For example, Fish's Tide prompt framework checks for that environment
variable and displays it in the prompt, indicating that the shell is in
a Nix environment.
This is not new behaviour, and the old Nix2 commands set the variable.
If the shell that is created is a "pure" shell, ie --ignore-environment
is passed, then IN_NIX_SHELL will be set to "pure". However, "nix
develop" will always create an impure environment.
Replicated from my Nix PR: https://github.com/NixOS/nix/pull/8885
Change-Id: I695cdc336f76541940a302835124fe7d8f7f39b2
Signed-off-by: Ersei Saggi <vcs@ersei.net>
I'm sorry but checking the name of the function arguments to be "final"
and "prev" is just absurd. That's like worst of
type-checking-meets-static-analysis. And the error message of the second
`throw` was not even good, as it mixed all three failure cases together.
Change-Id: Id4244171123dd8a228be71ce9f04d8e9f647c111
The Mercurial fetcher previously used the revision number supplied by Mercurial
as its revision count. This is inappropriate, as the revision number is
incremented each time a change is added to the local repository, so also
changes only reachable from other heads will be counted. For the same reason,
it will also depend on whether such changes have been fetched before from the
same repository, introducing an impurity. Instead the revisions have to be
counted explicitly, similar to the Git fetcher.
Change-Id: Idb1e66ae2fb8b05101116c815f453efd6e95b09e
using UTF-8 bullets in the sample avoids locale confusion where Bash
doesn't know to treat `•` as a single character.
Signed-off-by: Dusk Banks <me@bb010g.com>
Change-Id: I829019b66e93e6d33ac3a6641df07d0dd2332a5a
This change feels kind of gross and reveals a fair bit about the
disorganization of our tests, but I think it makes parts of it a bit
better.
Change-Id: Idb8d9a00cbd75d5c156678c6b408b42b59d5e4d7
Closes#460
I managed to trigger the issue by having the following inputs (shortened):
authentik-nix.url = "github:nix-community/authentik-nix";
authentik-nix.inputs.poetry2nix.inputs.nixpkgs.follows = "nixpkgs";
When evaluating this using
nix-eval-jobs --flake .#hydraJobs
I got the following error:
error: cannot update unlocked flake input 'authentik-nix/poetry2nix' in pure mode
The issue we have here is that `authentik-nix/poetry2nix` was written
into the `overrideMap` which caused Nix to assume it's a new input and
tried to refetch it (#460) or errored out in pure mode
(nix-eval-jobs / Hydra).
The testcase unfortunately only involves checking for the output log
and makes sure that something *is* logged on the first fetch so that
the test doesn't rot when the logging changes since I didn't
manage to trigger the error above with the reproducer from #460. In
fact, I only managed to trigger the `cannot update unlocked flake input`
error in this context with `nix-eval-jobs`.
Change-Id: Ifd00091eec9a0067ed4bb3e5765a15d027328807
Turns out strings do not like being resized to -4.
This was discovered while messing with the tests to remove unbuffer and
trying stdbuf instead. Turns out that was not the right approach.
This basically rewrites the handling of this case to be much more
correct, and fixes a bug where with small window sizes where it would
ALSO truncate the attr names in addition to the optional descriptions.
Change-Id: Ifd1beeaffdb47cbb5f4a462b183fcb6c0ff6c524
I was packaging Lix 2.91 for nixpkgs and was annoyed at the expect
dependency. Turns out that you can replace unbuffer with a pretty-short
Python script.
It became less short after I found out that Linux was converting \n to
\r\n in the terminal subsystem, which was not very funny, but is at
least solved by twiddling termios bits.
Change-Id: I8a2700abcbbf6a9902e01b05b40fa9340c0ab90c
This was always in the lock file and we can simply actually print it.
The test for this is a little bit silly but it should correctly
control for my daring to exercise timezone code *and* locale code in a
test, which I strongly suspect nobody dared do before.
Sample (abridged):
```
Path: /nix/store/gaxb42z68bcr8lch467shvmnhjjzgd8b-source
Last modified: 1970-01-01 00:16:40
Inputs:
├───flake-compat: github:edolstra/flake-compat/0f9255e01c2351cc7d116c072cb317785dd33b33
│ Last modified: 2023-10-04 13:37:54
├───flake-utils: github:numtide/flake-utils/b1d9ab70662946ef0850d488da1c9019f3a9752a
│ Last modified: 2024-03-11 08:33:50
│ └───systems: github:nix-systems/default/da67096a3b9bf56a91d16901293e51ba5b49a27e
│ Last modified: 2023-04-09 08:27:08
```
Change-Id: I355f82cb4b633974295375ebad646fb6e2107f9b
eldritch horrors