mirror of
https://github.com/NixOS/nix
synced 2024-09-20 11:11:03 -04:00
106 lines
3.5 KiB
C++
106 lines
3.5 KiB
C++
#include "fetchers.hh"
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#include "url-parts.hh"
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namespace nix::fetchers {
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std::regex flakeRegex("[a-zA-Z][a-zA-Z0-9_-]*", std::regex::ECMAScript);
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struct IndirectInputScheme : InputScheme
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{
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std::optional<Input> inputFromURL(const ParsedURL & url) override
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{
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if (url.scheme != "flake") return {};
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auto path = tokenizeString<std::vector<std::string>>(url.path, "/");
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std::optional<Hash> rev;
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std::optional<std::string> ref;
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if (path.size() == 1) {
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} else if (path.size() == 2) {
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if (std::regex_match(path[1], revRegex))
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rev = Hash::parseAny(path[1], htSHA1);
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else if (std::regex_match(path[1], refRegex))
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ref = path[1];
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else
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throw BadURL("in flake URL '%s', '%s' is not a commit hash or branch/tag name", url.url, path[1]);
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} else if (path.size() == 3) {
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if (!std::regex_match(path[1], refRegex))
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throw BadURL("in flake URL '%s', '%s' is not a branch/tag name", url.url, path[1]);
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ref = path[1];
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if (!std::regex_match(path[2], revRegex))
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throw BadURL("in flake URL '%s', '%s' is not a commit hash", url.url, path[2]);
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rev = Hash::parseAny(path[2], htSHA1);
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} else
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throw BadURL("GitHub URL '%s' is invalid", url.url);
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std::string id = path[0];
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if (!std::regex_match(id, flakeRegex))
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throw BadURL("'%s' is not a valid flake ID", id);
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// FIXME: forbid query params?
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Input input;
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input.direct = false;
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input.attrs.insert_or_assign("type", "indirect");
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input.attrs.insert_or_assign("id", id);
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if (rev) input.attrs.insert_or_assign("rev", rev->gitRev());
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if (ref) input.attrs.insert_or_assign("ref", *ref);
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return input;
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}
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std::optional<Input> inputFromAttrs(const Attrs & attrs) override
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{
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if (maybeGetStrAttr(attrs, "type") != "indirect") return {};
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for (auto & [name, value] : attrs)
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if (name != "type" && name != "id" && name != "ref" && name != "rev" && name != "narHash")
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throw Error("unsupported indirect input attribute '%s'", name);
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auto id = getStrAttr(attrs, "id");
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if (!std::regex_match(id, flakeRegex))
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throw BadURL("'%s' is not a valid flake ID", id);
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Input input;
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input.direct = false;
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input.attrs = attrs;
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return input;
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}
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ParsedURL toURL(const Input & input) override
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{
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ParsedURL url;
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url.scheme = "flake";
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url.path = getStrAttr(input.attrs, "id");
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if (auto ref = input.getRef()) { url.path += '/'; url.path += *ref; };
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if (auto rev = input.getRev()) { url.path += '/'; url.path += rev->gitRev(); };
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return url;
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}
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bool hasAllInfo(const Input & input) override
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{
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return false;
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}
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Input applyOverrides(
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const Input & _input,
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std::optional<std::string> ref,
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std::optional<Hash> rev) override
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{
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auto input(_input);
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if (rev) input.attrs.insert_or_assign("rev", rev->gitRev());
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if (ref) input.attrs.insert_or_assign("ref", *ref);
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return input;
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}
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std::pair<Tree, Input> fetch(ref<Store> store, const Input & input) override
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{
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throw Error("indirect input '%s' cannot be fetched directly", input.to_string());
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}
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};
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static auto r1 = OnStartup([] { registerInputScheme(std::make_unique<IndirectInputScheme>()); });
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}
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