1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
|
#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 = 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));
}
}
}
|
