forked from lix-project/lix
87 lines
2.5 KiB
C++
87 lines
2.5 KiB
C++
#include "fetchers.hh"
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#include "store-api.hh"
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#include <nlohmann/json.hpp>
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namespace nix::fetchers {
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std::unique_ptr<std::vector<std::unique_ptr<InputScheme>>> inputSchemes = nullptr;
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void registerInputScheme(std::unique_ptr<InputScheme> && inputScheme)
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{
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if (!inputSchemes) inputSchemes = std::make_unique<std::vector<std::unique_ptr<InputScheme>>>();
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inputSchemes->push_back(std::move(inputScheme));
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}
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std::unique_ptr<Input> inputFromURL(const ParsedURL & url)
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{
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for (auto & inputScheme : *inputSchemes) {
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auto res = inputScheme->inputFromURL(url);
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if (res) return res;
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}
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throw Error("input '%s' is unsupported", url.url);
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}
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std::unique_ptr<Input> inputFromURL(const std::string & url)
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{
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return inputFromURL(parseURL(url));
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}
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std::unique_ptr<Input> inputFromAttrs(const Attrs & attrs)
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{
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auto attrs2(attrs);
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attrs2.erase("narHash");
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for (auto & inputScheme : *inputSchemes) {
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auto res = inputScheme->inputFromAttrs(attrs2);
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if (res) {
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if (auto narHash = maybeGetStrAttr(attrs, "narHash"))
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// FIXME: require SRI hash.
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res->narHash = Hash(*narHash);
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return res;
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}
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}
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throw Error("input '%s' is unsupported", attrsToJson(attrs));
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}
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Attrs Input::toAttrs() const
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{
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auto attrs = toAttrsInternal();
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if (narHash)
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attrs.emplace("narHash", narHash->to_string(SRI));
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attrs.emplace("type", type());
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return attrs;
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}
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std::pair<Tree, std::shared_ptr<const Input>> Input::fetchTree(ref<Store> store) const
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{
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auto [tree, input] = fetchTreeInternal(store);
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if (tree.actualPath == "")
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tree.actualPath = store->toRealPath(tree.storePath);
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if (!tree.info.narHash)
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tree.info.narHash = store->queryPathInfo(tree.storePath)->narHash;
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if (input->narHash)
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assert(input->narHash == tree.info.narHash);
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if (narHash && narHash != input->narHash)
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throw Error("NAR hash mismatch in input '%s' (%s), expected '%s', got '%s'",
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to_string(), tree.actualPath, narHash->to_string(SRI), input->narHash->to_string(SRI));
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return {std::move(tree), input};
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}
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std::shared_ptr<const Input> Input::applyOverrides(
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std::optional<std::string> ref,
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std::optional<Hash> rev) const
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{
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if (ref)
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throw Error("don't know how to apply '%s' to '%s'", *ref, to_string());
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if (rev)
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throw Error("don't know how to apply '%s' to '%s'", rev->to_string(Base16, false), to_string());
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return shared_from_this();
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}
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}
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