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
|
#include "registry.hh"
#include "util.hh"
#include "fetchers.hh"
#include "globals.hh"
#include "download.hh"
#include <nlohmann/json.hpp>
namespace nix::fetchers {
std::shared_ptr<Registry> Registry::read(
const Path & path, RegistryType type)
{
auto registry = std::make_shared<Registry>(type);
if (!pathExists(path))
return std::make_shared<Registry>(type);
auto json = nlohmann::json::parse(readFile(path));
auto version = json.value("version", 0);
// FIXME: remove soon
if (version == 1) {
auto flakes = json["flakes"];
for (auto i = flakes.begin(); i != flakes.end(); ++i) {
auto url = i->value("url", i->value("uri", ""));
if (url.empty())
throw Error("flake registry '%s' lacks a 'url' attribute for entry '%s'",
path, i.key());
registry->entries.push_back(
{inputFromURL(i.key()), inputFromURL(url), {}});
}
}
else if (version == 2) {
for (auto & i : json["flakes"]) {
auto toAttrs = jsonToAttrs(i["to"]);
Input::Attrs extraAttrs;
auto j = toAttrs.find("subdir");
if (j != toAttrs.end()) {
extraAttrs.insert(*j);
toAttrs.erase(j);
}
registry->entries.push_back(
{ inputFromAttrs(jsonToAttrs(i["from"]))
, inputFromAttrs(toAttrs)
, extraAttrs
});
}
}
else
throw Error("flake registry '%s' has unsupported version %d", path, version);
return registry;
}
void Registry::write(const Path & path)
{
nlohmann::json arr;
for (auto & elem : entries) {
nlohmann::json obj;
obj["from"] = attrsToJson(std::get<0>(elem)->toAttrs());
obj["to"] = attrsToJson(std::get<1>(elem)->toAttrs());
obj["to"].update(attrsToJson(std::get<2>(elem)));
arr.emplace_back(std::move(obj));
}
nlohmann::json json;
json["version"] = 2;
json["flakes"] = std::move(arr);
createDirs(dirOf(path));
writeFile(path, json.dump(2));
}
void Registry::add(
const std::shared_ptr<const Input> & from,
const std::shared_ptr<const Input> & to,
const Input::Attrs & extraAttrs)
{
entries.emplace_back(from, to, extraAttrs);
}
void Registry::remove(const std::shared_ptr<const Input> & input)
{
// FIXME: use C++20 std::erase.
for (auto i = entries.begin(); i != entries.end(); )
if (*std::get<0>(*i) == *input)
i = entries.erase(i);
else
++i;
}
Path getUserRegistryPath()
{
return getHome() + "/.config/nix/registry.json";
}
std::shared_ptr<Registry> getUserRegistry()
{
return Registry::read(getUserRegistryPath(), Registry::User);
}
static std::shared_ptr<Registry> flagRegistry =
std::make_shared<Registry>(Registry::Flag);
std::shared_ptr<Registry> getFlagRegistry()
{
return flagRegistry;
}
void overrideRegistry(
const std::shared_ptr<const Input> & from,
const std::shared_ptr<const Input> & to,
const Input::Attrs & extraAttrs)
{
flagRegistry->add(from, to, extraAttrs);
}
static std::shared_ptr<Registry> getGlobalRegistry(ref<Store> store)
{
static auto reg = [&]() {
auto path = settings.flakeRegistry;
if (!hasPrefix(path, "/")) {
CachedDownloadRequest request(path);
request.name = "flake-registry.json";
request.gcRoot = true;
path = getDownloader()->downloadCached(store, request).path;
}
return Registry::read(path, Registry::Global);
}();
return reg;
}
Registries getRegistries(ref<Store> store)
{
Registries registries;
registries.push_back(getFlagRegistry());
registries.push_back(getUserRegistry());
registries.push_back(getGlobalRegistry(store));
return registries;
}
std::pair<std::shared_ptr<const Input>, Input::Attrs> lookupInRegistries(
ref<Store> store,
std::shared_ptr<const Input> input)
{
Input::Attrs extraAttrs;
int n = 0;
restart:
n++;
if (n > 100) throw Error("cycle detected in flake registr for '%s'", input);
for (auto & registry : getRegistries(store)) {
// FIXME: O(n)
for (auto & entry : registry->entries) {
auto from = std::get<0>(entry);
if (from->contains(*input)) {
input = std::get<1>(entry)->applyOverrides(
!from->getRef() && input->getRef() ? input->getRef() : std::optional<std::string>(),
!from->getRev() && input->getRev() ? input->getRev() : std::optional<Hash>());
extraAttrs = std::get<2>(entry);
goto restart;
}
}
}
if (!input->isDirect())
throw Error("cannot find flake '%s' in the flake registries", input->to_string());
return {input, extraAttrs};
}
}
|
