670feb000a
This fetchers copies a plain directory (i.e. not a Git/Mercurial
repository) to the store (or does nothing if the path is already a
store path).
One use case is to pin the 'nixpkgs' flake used to build the current
NixOS system, and prevent it from being garbage-collected, via a
system registry entry like this:
{
"from": {
"id": "nixpkgs",
"type": "indirect"
},
"to": {
"type": "path",
"path": "/nix/store/rralhl3wj4rdwzjn16g7d93mibvlr521-source",
"lastModified": 1585388205,
"rev": "b0c285807d6a9f1b7562ec417c24fa1a30ecc31a"
},
"exact": true
}
Note the fake "lastModified" and "rev" attributes that ensure that the
flake gives the same evaluation results as the corresponding
Git/GitHub inputs.
(cherry picked from commit 12f9379123)
108 lines
3.1 KiB
C++
108 lines
3.1 KiB
C++
#include "attrs.hh"
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#include "fetchers.hh"
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#include <nlohmann/json.hpp>
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namespace nix::fetchers {
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Attrs jsonToAttrs(const nlohmann::json & json)
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{
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Attrs attrs;
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for (auto & i : json.items()) {
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if (i.value().is_number())
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attrs.emplace(i.key(), i.value().get<int64_t>());
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else if (i.value().is_string())
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attrs.emplace(i.key(), i.value().get<std::string>());
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else if (i.value().is_boolean())
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attrs.emplace(i.key(), i.value().get<bool>());
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else
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throw Error("unsupported input attribute type in lock file");
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}
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return attrs;
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}
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nlohmann::json attrsToJson(const Attrs & attrs)
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{
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nlohmann::json json;
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for (auto & attr : attrs) {
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if (auto v = std::get_if<int64_t>(&attr.second)) {
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json[attr.first] = *v;
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} else if (auto v = std::get_if<std::string>(&attr.second)) {
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json[attr.first] = *v;
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} else if (auto v = std::get_if<Explicit<bool>>(&attr.second)) {
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json[attr.first] = v->t;
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} else abort();
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}
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return json;
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}
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std::optional<std::string> maybeGetStrAttr(const Attrs & attrs, const std::string & name)
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{
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auto i = attrs.find(name);
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if (i == attrs.end()) return {};
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if (auto v = std::get_if<std::string>(&i->second))
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return *v;
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throw Error("input attribute '%s' is not a string %s", name, attrsToJson(attrs).dump());
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}
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std::string getStrAttr(const Attrs & attrs, const std::string & name)
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{
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auto s = maybeGetStrAttr(attrs, name);
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if (!s)
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throw Error("input attribute '%s' is missing", name);
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return *s;
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}
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std::optional<int64_t> maybeGetIntAttr(const Attrs & attrs, const std::string & name)
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{
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auto i = attrs.find(name);
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if (i == attrs.end()) return {};
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if (auto v = std::get_if<int64_t>(&i->second))
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return *v;
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throw Error("input attribute '%s' is not an integer", name);
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}
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int64_t getIntAttr(const Attrs & attrs, const std::string & name)
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{
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auto s = maybeGetIntAttr(attrs, name);
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if (!s)
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throw Error("input attribute '%s' is missing", name);
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return *s;
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}
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std::optional<bool> maybeGetBoolAttr(const Attrs & attrs, const std::string & name)
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{
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auto i = attrs.find(name);
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if (i == attrs.end()) return {};
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if (auto v = std::get_if<int64_t>(&i->second))
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return *v;
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throw Error("input attribute '%s' is not a Boolean", name);
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}
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bool getBoolAttr(const Attrs & attrs, const std::string & name)
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{
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auto s = maybeGetBoolAttr(attrs, name);
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if (!s)
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throw Error("input attribute '%s' is missing", name);
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return *s;
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}
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std::map<std::string, std::string> attrsToQuery(const Attrs & attrs)
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{
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std::map<std::string, std::string> query;
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for (auto & attr : attrs) {
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if (auto v = std::get_if<int64_t>(&attr.second)) {
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query.insert_or_assign(attr.first, fmt("%d", *v));
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} else if (auto v = std::get_if<std::string>(&attr.second)) {
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query.insert_or_assign(attr.first, *v);
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} else if (auto v = std::get_if<Explicit<bool>>(&attr.second)) {
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query.insert_or_assign(attr.first, v->t ? "1" : "0");
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} else abort();
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}
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return query;
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}
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}
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