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The typical use is to inherit Config and add Setting<T> members:
class MyClass : private Config
{
Setting<int> foo{this, 123, "foo", "the number of foos to use"};
Setting<std::string> bar{this, "blabla", "bar", "the name of the bar"};
MyClass() : Config(readConfigFile("/etc/my-app.conf"))
{
std::cout << foo << "\n"; // will print 123 unless overriden
}
};
Currently, this is used by Store and its subclasses for store
parameters. You now get a warning if you specify a non-existant store
parameter in a store URI.
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Move note about float support out of the wrong release notes
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Looks like this snuck into the 1.11 release notes post-release, but
float support isn't actually present until 1.12.
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Process nix.conf options in "new" commands, add test
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Somehow this came back after d1da6967b8891763ce04d668027cf300c9bbf0b2.
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Thanks @copumpkin.
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Default to 5 download retries
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Add CURLE_WRITE_ERROR as a transient error condition
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We've observed it failing downloads in the wild and retrying the same URL
a few moments later seemed to fix it.
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This should help certain downloaders that don't request anything special
for the number of retries, like nix-channel.
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Also, possible fix for #1310 on 32-bit systems.
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Using the empty string is likely to be ambiguous in some contexts.
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Timeout tests rely on failed build to determine success,
so make sure these derivations (silent in particular)
don't fail regardless of timeout behavior.
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Without this (minor) change, the options set using "--option"
or read from nix.conf were parsed but not used.
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Retry downloads on transient SSL errors too
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This provides a significant speedup, e.g. 64 s -> 12 s for
nix-build --dry-run -I nixpkgs=channel:nixos-16.03 '<nixpkgs/nixos/tests/misc.nix>' -A test
on a cold local and CloudFront cache.
The alternative is to use lots of concurrent daemon connections but
that seems wasteful.
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This is useless because the client also caches path info, and can
cause problems for long-running clients like hydra-queue-runner
(i.e. it may return cached info about paths that have been
garbage-collected).
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E.g. you can now redirect /etc/resolv.conf to a different file.
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Not every distribution uses nscd.
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http://hydra.nixos.org/build/51095532
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This fixes "No such file or directory" when opening /dev/ptmx
(e.g. http://hydra.nixos.org/build/51094249).
The reason appears to be some changes to /dev/ptmx / /dev/pts handling
between Linux 4.4 and 4.9. See
https://patchwork.kernel.org/patch/7832531/.
The fix is to go back to mounting a proper /dev/pts instance inside
the sandbox. Happily, this now works inside user namespaces, even for
unprivileged users. So
NIX_REMOTE=local?root=/tmp/nix nix-build \
'<nixpkgs/nixos/tests/misc.nix>' -A test
works for non-root users.
The downside is that the fix breaks sandbox builds on older kernels
(probably pre-4.6), since mounting a devpts fails inside user
namespaces for some reason I've never been able to figure out. Builds
on those systems will fail with
error: while setting up the build environment: mounting /dev/pts: Invalid argument
Ah well.
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Execute a given program with the (optional) given arguments as the
user running the evaluation, parsing stdout as an expression to be
evaluated.
There are many use cases for nix that would benefit from being able to
run arbitrary code during evaluation, including but not limited to:
* Automatic git fetching to get a sha256 from a git revision
* git rev-parse HEAD
* Automatic extraction of information from build specifications from
other tools, particularly language-specific package managers like
cabal or npm
* Secrets decryption (e.g. with nixops)
* Private repository fetching
Ideally, we would add this functionality in a more principled way to
nix, but in the mean time 'builtins.exec' can be used to get these
tasks done.
The primop is only available when the
'allow-unsafe-native-code-during-evaluation' nix option is true. That
flag also enables the 'importNative' primop, which is strictly more
powerful but less convenient (since it requires compiling a plugin
against the running version of nix).
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These were generated by a legacy tool.
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Fix minor grammatical nitpick ("it's" vs. "its") in `README.md`.
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See: http://data.grammarbook.com/blog/pronouns/1-grammar-error/
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Fixes #1285.
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This is consistent with the behaviour of the old
download-from-binary-cache substituter.
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This corresponds to the NixOS default.
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Fixes #1283.
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