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#include "fetchers.hh"
namespace nix::fetchers {
std::regex flakeRegex("[a-zA-Z][a-zA-Z0-9_-]*", std::regex::ECMAScript);
struct IndirectInput : Input
{
std::string id;
std::optional<Hash> rev;
std::optional<std::string> ref;
std::string type() const override { return "indirect"; }
bool operator ==(const Input & other) const override
{
auto other2 = dynamic_cast<const IndirectInput *>(&other);
return
other2
&& id == other2->id
&& rev == other2->rev
&& ref == other2->ref;
}
bool isDirect() const override
{
return false;
}
std::optional<std::string> getRef() const override { return ref; }
std::optional<Hash> getRev() const override { return rev; }
bool contains(const Input & other) const override
{
auto other2 = dynamic_cast<const IndirectInput *>(&other);
return
other2
&& id == other2->id
&& (!ref || ref == other2->ref)
&& (!rev || rev == other2->rev);
}
ParsedURL toURL() const override
{
ParsedURL url;
url.scheme = "flake";
url.path = id;
if (ref) { url.path += '/'; url.path += *ref; };
if (rev) { url.path += '/'; url.path += rev->gitRev(); };
return url;
}
Attrs toAttrsInternal() const override
{
Attrs attrs;
attrs.emplace("id", id);
if (ref)
attrs.emplace("ref", *ref);
if (rev)
attrs.emplace("rev", rev->gitRev());
return attrs;
}
std::shared_ptr<const Input> applyOverrides(
std::optional<std::string> ref,
std::optional<Hash> rev) const override
{
if (!ref && !rev) return shared_from_this();
auto res = std::make_shared<IndirectInput>(*this);
if (ref) res->ref = ref;
if (rev) res->rev = rev;
return res;
}
std::pair<Tree, std::shared_ptr<const Input>> fetchTreeInternal(nix::ref<Store> store) const override
{
throw Error("indirect input '%s' cannot be fetched directly", to_string());
}
};
struct IndirectInputScheme : InputScheme
{
std::unique_ptr<Input> inputFromURL(const ParsedURL & url) override
{
if (url.scheme != "flake") return nullptr;
auto path = tokenizeString<std::vector<std::string>>(url.path, "/");
auto input = std::make_unique<IndirectInput>();
if (path.size() == 1) {
} else if (path.size() == 2) {
if (std::regex_match(path[1], revRegex))
input->rev = Hash(path[1], htSHA1);
else if (std::regex_match(path[1], refRegex))
input->ref = path[1];
else
throw BadURL("in flake URL '%s', '%s' is not a commit hash or branch/tag name", url.url, path[1]);
} else if (path.size() == 3) {
if (!std::regex_match(path[1], refRegex))
throw BadURL("in flake URL '%s', '%s' is not a branch/tag name", url.url, path[1]);
input->ref = path[1];
if (!std::regex_match(path[2], revRegex))
throw BadURL("in flake URL '%s', '%s' is not a commit hash", url.url, path[2]);
input->rev = Hash(path[2], htSHA1);
} else
throw BadURL("GitHub URL '%s' is invalid", url.url);
// FIXME: forbid query params?
input->id = path[0];
if (!std::regex_match(input->id, flakeRegex))
throw BadURL("'%s' is not a valid flake ID", input->id);
return input;
}
std::unique_ptr<Input> inputFromAttrs(const Attrs & attrs) override
{
if (maybeGetStrAttr(attrs, "type") != "indirect") return {};
for (auto & [name, value] : attrs)
if (name != "type" && name != "id" && name != "ref" && name != "rev")
throw Error("unsupported indirect input attribute '%s'", name);
auto input = std::make_unique<IndirectInput>();
input->id = getStrAttr(attrs, "id");
input->ref = maybeGetStrAttr(attrs, "ref");
if (auto rev = maybeGetStrAttr(attrs, "rev"))
input->rev = Hash(*rev, htSHA1);
return input;
}
};
static auto r1 = OnStartup([] { registerInputScheme(std::make_unique<IndirectInputScheme>()); });
}
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