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|
#include "eval-settings.hh"
#include "common-eval-args.hh"
#include "shared.hh"
#include "filetransfer.hh"
#include "eval.hh"
#include "fetchers.hh"
#include "registry.hh"
#include "flake/flakeref.hh"
#include "store-api.hh"
#include "command.hh"
#include <regex>
namespace nix {
static std::regex const identifierRegex("^[A-Za-z_][A-Za-z0-9_'-]*$");
static void warnInvalidNixIdentifier(const std::string & name)
{
std::smatch match;
if (!std::regex_match(name, match, identifierRegex)) {
warn("This Nix invocation specifies a value for argument '%s' which isn't a valid \
Nix identifier. The project is considering to drop support for this \
or to require quotes around args that aren't valid Nix identifiers. \
If you depend on this behvior, please reach out in \
https://git.lix.systems/lix-project/lix/issues/496 so we can discuss \
your use-case.", name);
}
}
MixEvalArgs::MixEvalArgs()
{
addFlag({
.longName = "arg",
.description = "Pass the value *expr* as the argument *name* to Nix functions.",
.category = category,
.labels = {"name", "expr"},
.handler = {[&](std::string name, std::string expr) {
warnInvalidNixIdentifier(name);
autoArgs[name] = 'E' + expr;
}}
});
addFlag({
.longName = "argstr",
.description = "Pass the string *string* as the argument *name* to Nix functions.",
.category = category,
.labels = {"name", "string"},
.handler = {[&](std::string name, std::string s) {
warnInvalidNixIdentifier(name);
autoArgs[name] = 'S' + s;
}},
});
addFlag({
.longName = "include",
.shortName = 'I',
.description = R"(
Add *path* to the Nix search path. The Nix search path is
initialized from the colon-separated [`NIX_PATH`](@docroot@/command-ref/env-common.md#env-NIX_PATH) environment
variable, and is used to look up the location of Nix expressions using [paths](@docroot@/language/values.md#type-path) enclosed in angle
brackets (i.e., `<nixpkgs>`).
For instance, passing
```
-I /home/eelco/Dev
-I /etc/nixos
```
will cause Lix to look for paths relative to `/home/eelco/Dev` and
`/etc/nixos`, in that order. This is equivalent to setting the
`NIX_PATH` environment variable to
```
/home/eelco/Dev:/etc/nixos
```
It is also possible to match paths against a prefix. For example,
passing
```
-I nixpkgs=/home/eelco/Dev/nixpkgs-branch
-I /etc/nixos
```
will cause Lix to search for `<nixpkgs/path>` in
`/home/eelco/Dev/nixpkgs-branch/path` and `/etc/nixos/nixpkgs/path`.
If a path in the Nix search path starts with `http://` or `https://`,
it is interpreted as the URL of a tarball that will be downloaded and
unpacked to a temporary location. The tarball must consist of a single
top-level directory. For example, passing
```
-I nixpkgs=https://github.com/NixOS/nixpkgs/archive/master.tar.gz
```
tells Lix to download and use the current contents of the `master`
branch in the `nixpkgs` repository.
The URLs of the tarballs from the official `nixos.org` channels
(see [the manual page for `nix-channel`](../nix-channel.md)) can be
abbreviated as `channel:<channel-name>`. For instance, the
following two flags are equivalent:
```
-I nixpkgs=channel:nixos-21.05
-I nixpkgs=https://nixos.org/channels/nixos-21.05/nixexprs.tar.xz
```
You can also fetch source trees using [flake URLs](./nix3-flake.md#url-like-syntax) and add them to the
search path. For instance,
```
-I nixpkgs=flake:nixpkgs
```
specifies that the prefix `nixpkgs` shall refer to the source tree
downloaded from the `nixpkgs` entry in the flake registry. Similarly,
```
-I nixpkgs=flake:github:NixOS/nixpkgs/nixos-22.05
```
makes `<nixpkgs>` refer to a particular branch of the
`NixOS/nixpkgs` repository on GitHub.
)",
.category = category,
.labels = {"path"},
.handler = {[&](std::string s) {
searchPath.elements.emplace_back(SearchPath::Elem::parse(s));
}}
});
addFlag({
.longName = "impure",
.description = "Allow access to mutable paths and repositories.",
.category = category,
.handler = {[&]() {
evalSettings.pureEval.override(false);
}},
});
addFlag({
.longName = "override-flake",
.description = "Override the flake registries, redirecting *original-ref* to *resolved-ref*.",
.category = category,
.labels = {"original-ref", "resolved-ref"},
.handler = {[&](std::string _from, std::string _to) {
auto from = parseFlakeRef(_from, absPath("."));
auto to = parseFlakeRef(_to, absPath("."));
fetchers::Attrs extraAttrs;
if (to.subdir != "") extraAttrs["dir"] = to.subdir;
fetchers::overrideRegistry(from.input, to.input, extraAttrs);
}},
.completer = {[&](AddCompletions & completions, size_t, std::string_view prefix) {
completeFlakeRef(completions, openStore(), prefix);
}}
});
addFlag({
.longName = "eval-store",
.description =
R"(
The [URL of the Nix store](@docroot@/command-ref/new-cli/nix3-help-stores.md#store-url-format)
to use for evaluation, i.e. to store derivations (`.drv` files) and inputs referenced by them.
)",
.category = category,
.labels = {"store-url"},
.handler = {&evalStoreUrl},
});
}
Bindings * MixEvalArgs::getAutoArgs(EvalState & state)
{
auto res = state.buildBindings(autoArgs.size());
for (auto & i : autoArgs) {
auto v = state.allocValue();
if (i.second[0] == 'E')
state.mkThunk_(*v, state.parseExprFromString(i.second.substr(1), state.rootPath(CanonPath::fromCwd())));
else
v->mkString(((std::string_view) i.second).substr(1));
res.insert(state.symbols.create(i.first), v);
}
return res.finish();
}
SourcePath lookupFileArg(EvalState & state, std::string_view fileArg)
{
if (EvalSettings::isPseudoUrl(fileArg)) {
auto const url = EvalSettings::resolvePseudoUrl(fileArg);
auto const downloaded = fetchers::downloadTarball(
state.store,
url,
/* name */ "source",
/* locked */ false
);
StorePath const storePath = downloaded.tree.storePath;
return state.rootPath(CanonPath(state.store->toRealPath(storePath)));
} else if (fileArg.starts_with("flake:")) {
experimentalFeatureSettings.require(Xp::Flakes);
static constexpr size_t FLAKE_LEN = std::string_view("flake:").size();
auto flakeRef = parseFlakeRef(std::string(fileArg.substr(FLAKE_LEN)), {}, true, false);
auto storePath = flakeRef.resolve(state.store).fetchTree(state.store).first.storePath;
return state.rootPath(CanonPath(state.store->toRealPath(storePath)));
} else if (fileArg.size() > 2 && fileArg.at(0) == '<' && fileArg.at(fileArg.size() - 1) == '>') {
Path p(fileArg.substr(1, fileArg.size() - 2));
return state.findFile(p);
} else {
return state.rootPath(CanonPath::fromCwd(fileArg));
}
}
}
|
