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Without dereferencing this pointer, you'd get an error like this:
```
error: unsupported argument 'abc' to 'fetchTarball', at 0x13627e8
```
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pass Pos to forceValue to improve infinite recursion error
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More #3377.
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We want to *trace* the 'Value *' arrays, not garbage-collect them!
Otherwise the vectors/maps can end up pointing to nowhere.
Fixes #3377. Closes #3384.
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improve toFile error message when containing potential drv path
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Make function arguments retain position info
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This provides a pluggable mechanism for defining new fetchers. It adds
a builtin function 'fetchTree' that generalizes existing fetchers like
'fetchGit', 'fetchMercurial' and 'fetchTarball'. 'fetchTree' takes a
set of attributes, e.g.
fetchTree {
type = "git";
url = "https://example.org/repo.git";
ref = "some-branch";
rev = "abcdef...";
}
The existing fetchers are just wrappers around this. Note that the
input attributes to fetchTree are the same as flake input
specifications and flake lock file entries.
All fetchers share a common cache stored in
~/.cache/nix/fetcher-cache-v1.sqlite. This replaces the ad hoc caching
mechanisms in fetchGit and download.cc (e.g. ~/.cache/nix/{tarballs,git-revs*}).
This also adds support for Git worktrees (c169ea59049f861aaba429f48b828d0820b74d1d).
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The attrError variable is no longer used but still allocated on every
call to the findAlongAttrPath function.
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This allows querying the location of function arguments. E.g.
builtins.unsafeGetAttrPos "x" (builtins.functionArgs ({ x }: null))
=> { column = 57; file = "/home/infinisil/src/nix/inst/test.nix"; line = 1; }
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(cherry picked from commit 2c692a3b144523bca68dd6de618124ba6c9bb332)
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Using std::filesystem means also having to link with -lstdc++fs on
some platforms and it's hard to discover for what platforms this is
needed. As all the functionality is already implemented as utilities,
use those instead.
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Due to fetchGit not checking if rev is an ancestor of ref (there is even
a FIXME comment about it in the code), the cache repo might not have the
ref even though it has the rev. This doesn't matter when submodule =
false, but the submodule = true code blows up because it tries to fetch
the (missing) ref from the cache repo.
Fix this in the simplest way possible: fetch all refs from the local
cache repo when submodules = true.
TODO: Add tests.
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Major bugfix for the submodules = true code path.
TODO: Add tests.
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The .link file is used as a lock, so I think we should put the
"submodule" attribute in there since turning on submodules creates a new
.link file path.
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Before this change it would be false for all evaluations but the first.
Now it follows the input argument (as it should).
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submodules
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Some platforms seem to still require linking with stdc++fs to enable
STL std::filesystem support.
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This fixes fetching repositories with no submodules and also cleans up
.git files in checkouts.
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There are some downsides to this features:
- Submodules are not cached (unlike the root repo),
- Full checkouts are created in a temporary directory.
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https://hydra.nixos.org/build/110757285
(cherry picked from commit b430a81a1fbf6c792ba49e3aefe46256263430e5)
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E.g.
$ nix edit .#nixosConfigurations.bla
now works.
(cherry picked from commit d2032edb2f86e955a8a7724a27c0c3225f386500)
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(cherry picked from commit 0b013a54dc570395bed887369f8dd622b8ce337b)
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(cherry picked from commit 6b0ca8e803710342af70e257935724c5ad84ca04)
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(cherry picked from commit c02da997570ac0d9b595d787bea8cb5a4e3cc1f5)
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The evaluator was spending about 1% of its time compiling a small
number of regexes over and over again.
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Returning a nullable type in an optional is silly.
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