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Impure derivations are derivations that can produce a different result
every time they're built. Example:
stdenv.mkDerivation {
name = "impure";
__impure = true; # marks this derivation as impure
outputHashAlgo = "sha256";
outputHashMode = "recursive";
buildCommand = "date > $out";
};
Some important characteristics:
* This requires the 'impure-derivations' experimental feature.
* Impure derivations are not "cached". Thus, running "nix-build" on
the example above multiple times will cause a rebuild every time.
* They are implemented similar to CA derivations, i.e. the output is
moved to a content-addressed path in the store. The difference is
that we don't register a realisation in the Nix database.
* Pure derivations are not allowed to depend on impure derivations. In
the future fixed-output derivations will be allowed to depend on
impure derivations, thus forming an "impurity barrier" in the
dependency graph.
* When sandboxing is enabled, impure derivations can access the
network in the same way as fixed-output derivations. In relaxed
sandboxing mode, they can access the local filesystem.
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Make buildPathsWithResults() only return info on wanted outputs
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Fixes #6243.
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The new implementation relies on tab separting the hash and ref (this is how sourcehut does it). This fixes the integration test to use a tab instead of a space.
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Fix `nix build --dry-run` with CA derivations
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nix: allow using --file - to read from stdin
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Don’t try and assume that we know the output paths when we’ve just built
with `--dry-run`. Instead make `--dry-run` follow a different code path
that won’t assume the knowledge of the output paths at all.
Fix #6275
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nix-env: always print output names in JSON and XML
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Co-authored-by: pennae <82953136+pennae@users.noreply.github.com>
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year 2222 is too much for a 32 bit timestamp. So replace it by something
smaller
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Co-authored-by: Théophane Hufschmitt <7226587+thufschmitt@users.noreply.github.com>
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git fetcher: fix detection of dirty git workspaces
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```console
$ nix eval --expr '({ foo ? 1 }: foo) { fob = 2; }'
error: anonymous function at (string):1:2 called with unexpected argument 'fob'
at «string»:1:1:
1| ({ foo ? 1 }: foo) { fob = 2; }
| ^
Did you mean foo?
```
Not that because Nix will first check for _missing_ arguments before
checking for extra arguments, `({ foo }: foo) { fob = 1; }` will
complain about the missing `foo` argument (rather than extra `fob`) and
so won’t display a suggestion.
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Make the evaluator show some suggestions when trying to access an
invalid field from an attrset.
```console
$ nix eval --expr '{ foo = 1; }.foa'
error: attribute 'foa' missing
at «string»:1:1:
1| { foo = 1; }.foa
| ^
Did you mean foo?
```
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ssh-ng: also store build logs to make them accessible by `nix log`
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Fixes
nix-daemon: src/libstore/sqlite.cc:97: nix::SQLiteStmt::Use::Use(nix::SQLiteStmt&): Assertion `stmt.stmt' failed.
which happens because the daemon doesn't properly handle the case
where ca-derivations isn't enabled at daemon startup.
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Fixes #6193.
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A few notes:
* The `echo hi` is needed to make sure that a file that can be read by
`nix log` is properly created (i.e. some output is needed). This is
known and to be fixed in #6051.
* We explicitly ignore the floating-CA case here: the `$out` of `input3`
depends on `$out` of `input2`. This means that there are actually two
derivations - I assume that this is because at eval time (i.e.
`nix-instantiate -A`) the hash of `input2` isn't known yet and the
other .drv is created as soon as `input2` was built. This is another
issue on its own, so we ignore the case here explicitly.
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- Make sure that it starts even without the `nix-command` xp feature
- Fail if it doesn’t manage to start
This fixes a 30s wait for every test in `init.sh` as the daemon couldn’t
start, but the code was just waiting 30s and continuing as if everything
was all right.
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Replace defaultBla.$system with bla.$system.default
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testS: poll more eagerly for the daemon start/stop
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Polling every 1 second means that even the simplest test takes at least
2 seconds. We can reasonably poll 1/10 of that to make things much
quicker (esp. given that most of the time 0.1s is enough for the
daemon to be started or stopped)
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The tests are scheduled in the order they appear, so running the long
ones first slightly improves the scheduling.
On my machine, this decreases the time of `make install` from 40s to 36s
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This also simplifies some InstallableFlake logic and fixes 'nix
bundle' parsing its installable twice.
Fixes #5532.
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diff-index operates on the view that git has of the working tree,
which might be outdated. The higher-level diff command does this
automatically. This change also adds handling for submodules.
fixes #4140
Alternative fixes would be invoking update-index before diff-index or
matching more closely what require_clean_work_tree from git-sh-setup.sh
does, but both those options make it more difficult to reason about
correctness.
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The .git/refs/heads directory might be empty for a valid
usable git repository. This often happens in CI environments,
which might only fetch commits, not branches.
Therefore instead we let git itself check if HEAD points to
something that looks like a commit.
fixes #5302
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