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
|
#include "primops.hh"
#include "eval-inline.hh"
#include "fetchGit.hh"
#include "download.hh"
#include <queue>
#include <regex>
#include <nlohmann/json.hpp>
namespace nix {
const EvalState::FlakeRegistry & EvalState::getFlakeRegistry()
{
std::call_once(_flakeRegistryInit, [&]()
{
_flakeRegistry = std::make_unique<FlakeRegistry>();
if (!evalSettings.pureEval) {
#if 0
auto registryUri = "file:///home/eelco/Dev/gists/nix-flakes/registry.json";
auto registryFile = getDownloader()->download(DownloadRequest(registryUri));
#endif
auto registryFile = readFile(settings.nixDataDir + "/nix/flake-registry.json");
auto json = nlohmann::json::parse(registryFile);
auto version = json.value("version", 0);
if (version != 1)
throw Error("flake registry '%s' has unsupported version %d", registryFile, version);
auto flakes = json["flakes"];
for (auto i = flakes.begin(); i != flakes.end(); ++i) {
FlakeRegistry::Entry entry;
entry.uri = i->value("uri", "");
if (entry.uri.empty())
throw Error("invalid flake registry entry");
_flakeRegistry->entries.emplace(i.key(), entry);
}
}
});
return *_flakeRegistry;
}
static void prim_flakeRegistry(EvalState & state, const Pos & pos, Value * * args, Value & v)
{
auto registry = state.getFlakeRegistry();
state.mkAttrs(v, registry.entries.size());
for (auto & entry : registry.entries) {
auto vEntry = state.allocAttr(v, entry.first);
state.mkAttrs(*vEntry, 2);
mkString(*state.allocAttr(*vEntry, state.symbols.create("uri")), entry.second.uri);
vEntry->attrs->sort();
}
v.attrs->sort();
}
static RegisterPrimOp r1("__flakeRegistry", 0, prim_flakeRegistry);
struct Flake
{
std::string name;
std::string description;
Path path;
std::set<std::string> requires;
Value * vProvides; // FIXME: gc
};
std::regex flakeRegex("^flake:([a-zA-Z][a-zA-Z0-9_-]*)(/[a-zA-Z][a-zA-Z0-9_.-]*)?$");
std::regex githubRegex("^github:([a-zA-Z][a-zA-Z0-9_-]*)/([a-zA-Z][a-zA-Z0-9_-]*)(/([a-zA-Z][a-zA-Z0-9_-]*))?$");
static Path fetchFlake(EvalState & state, const std::string & flakeUri)
{
std::smatch match;
if (std::regex_match(flakeUri, match, flakeRegex)) {
auto flakeName = match[1];
auto revOrRef = match[2];
auto registry = state.getFlakeRegistry();
auto i = registry.entries.find(flakeName);
if (i == registry.entries.end())
throw Error("unknown flake '%s'", flakeName);
return fetchFlake(state, i->second.uri);
}
else if (std::regex_match(flakeUri, match, githubRegex)) {
auto owner = match[1];
auto repo = match[2];
auto revOrRef = match[4].str();
if (revOrRef.empty()) revOrRef = "master";
// FIXME: require hash in pure mode.
// FIXME: use regular /archive URLs instead? api.github.com
// might have stricter rate limits.
auto storePath = getDownloader()->downloadCached(state.store,
fmt("https://api.github.com/repos/%s/%s/tarball/%s", owner, repo, revOrRef),
true, "source");
// FIXME: extract revision hash from ETag.
return storePath;
}
else if (hasPrefix(flakeUri, "/") || hasPrefix(flakeUri, "git://")) {
auto gitInfo = exportGit(state.store, flakeUri, {}, "", "source");
return gitInfo.storePath;
}
else
throw Error("unsupported flake URI '%s'", flakeUri);
}
static Flake getFlake(EvalState & state, const std::string & flakeUri)
{
auto flakePath = fetchFlake(state, flakeUri);
state.store->assertStorePath(flakePath);
Flake flake;
Value vInfo;
state.evalFile(flakePath + "/flake.nix", vInfo);
state.forceAttrs(vInfo);
if (auto name = vInfo.attrs->get(state.sName))
flake.name = state.forceStringNoCtx(*(**name).value, *(**name).pos);
else
throw Error("flake lacks attribute 'name'");
if (auto description = vInfo.attrs->get(state.sDescription))
flake.description = state.forceStringNoCtx(*(**description).value, *(**description).pos);
if (auto requires = vInfo.attrs->get(state.symbols.create("requires"))) {
state.forceList(*(**requires).value, *(**requires).pos);
for (unsigned int n = 0; n < (**requires).value->listSize(); ++n)
flake.requires.insert(state.forceStringNoCtx(
*(**requires).value->listElems()[n], *(**requires).pos));
}
if (auto provides = vInfo.attrs->get(state.symbols.create("provides"))) {
state.forceFunction(*(**provides).value, *(**provides).pos);
flake.vProvides = (**provides).value;
} else
throw Error("flake lacks attribute 'provides'");
return flake;
}
static std::map<std::string, Flake> resolveFlakes(EvalState & state, const StringSet & flakeUris)
{
std::map<std::string, Flake> done;
std::queue<std::string> todo;
for (auto & i : flakeUris) todo.push(i);
while (!todo.empty()) {
auto flakeUri = todo.front();
todo.pop();
if (done.count(flakeUri)) continue;
auto flake = getFlake(state, flakeUri);
for (auto & require : flake.requires)
todo.push(require);
done.emplace(flake.name, flake);
}
return done;
}
static void prim_getFlake(EvalState & state, const Pos & pos, Value * * args, Value & v)
{
std::string flakeUri = state.forceStringNoCtx(*args[0], pos);
auto flakes = resolveFlakes(state, {flakeUri});
auto vResult = state.allocValue();
state.mkAttrs(*vResult, flakes.size());
for (auto & flake : flakes) {
auto vFlake = state.allocAttr(*vResult, flake.second.name);
state.mkAttrs(*vFlake, 2);
mkString(*state.allocAttr(*vFlake, state.sDescription), flake.second.description);
auto vProvides = state.allocAttr(*vFlake, state.symbols.create("provides"));
mkApp(*vProvides, *flake.second.vProvides, *vResult);
vFlake->attrs->sort();
}
vResult->attrs->sort();
v = *vResult;
}
static RegisterPrimOp r2("getFlake", 1, prim_getFlake);
}
|
