forked from lix-project/lix
256 lines
8.6 KiB
C++
256 lines
8.6 KiB
C++
#include "filetransfer.hh"
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#include "cache.hh"
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#include "fetchers.hh"
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#include "globals.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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struct GitArchiveInputScheme : InputScheme
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{
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virtual std::string type() = 0;
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std::optional<Input> inputFromURL(const ParsedURL & url) override
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{
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if (url.scheme != type()) 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() == 2) {
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} else if (path.size() == 3) {
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if (std::regex_match(path[2], revRegex))
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rev = Hash(path[2], htSHA1);
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else if (std::regex_match(path[2], refRegex))
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ref = path[2];
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else
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throw BadURL("in URL '%s', '%s' is not a commit hash or branch/tag name", url.url, path[2]);
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} else
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throw BadURL("URL '%s' is invalid", url.url);
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for (auto &[name, value] : url.query) {
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if (name == "rev") {
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if (rev)
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throw BadURL("URL '%s' contains multiple commit hashes", url.url);
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rev = Hash(value, htSHA1);
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}
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else if (name == "ref") {
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if (!std::regex_match(value, refRegex))
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throw BadURL("URL '%s' contains an invalid branch/tag name", url.url);
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if (ref)
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throw BadURL("URL '%s' contains multiple branch/tag names", url.url);
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ref = value;
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}
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// FIXME: barf on unsupported attributes
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}
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if (ref && rev)
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throw BadURL("URL '%s' contains both a commit hash and a branch/tag name", url.url);
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Input input;
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input.attrs.insert_or_assign("type", type());
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input.attrs.insert_or_assign("owner", path[0]);
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input.attrs.insert_or_assign("repo", path[1]);
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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") != type()) return {};
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for (auto & [name, value] : attrs)
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if (name != "type" && name != "owner" && name != "repo" && name != "ref" && name != "rev" && name != "narHash" && name != "lastModified")
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throw Error("unsupported input attribute '%s'", name);
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getStrAttr(attrs, "owner");
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getStrAttr(attrs, "repo");
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Input input;
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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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auto owner = getStrAttr(input.attrs, "owner");
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auto repo = getStrAttr(input.attrs, "repo");
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auto ref = input.getRef();
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auto rev = input.getRev();
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auto path = owner + "/" + repo;
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assert(!(ref && rev));
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if (ref) path += "/" + *ref;
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if (rev) path += "/" + rev->to_string(Base16, false);
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return ParsedURL {
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.scheme = type(),
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.path = path,
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};
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}
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bool hasAllInfo(const Input & input) override
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{
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return input.getRev() && maybeGetIntAttr(input.attrs, "lastModified");
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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) {
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input.attrs.insert_or_assign("rev", rev->gitRev());
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input.attrs.erase("ref");
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}
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if (ref) {
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if (input.getRev())
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throw BadURL("input '%s' contains both a commit hash and a branch/tag name", input.to_string());
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input.attrs.insert_or_assign("ref", *ref);
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}
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return input;
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}
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virtual Hash getRevFromRef(nix::ref<Store> store, const Input & input) const = 0;
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virtual std::string getDownloadUrl(const Input & input) const = 0;
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std::pair<Tree, Input> fetch(ref<Store> store, const Input & _input) override
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{
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Input input(_input);
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if (!maybeGetStrAttr(input.attrs, "ref")) input.attrs.insert_or_assign("ref", "master");
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auto rev = input.getRev();
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if (!rev) rev = getRevFromRef(store, input);
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input.attrs.erase("ref");
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input.attrs.insert_or_assign("rev", rev->gitRev());
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Attrs immutableAttrs({
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{"type", "git-tarball"},
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{"rev", rev->gitRev()},
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});
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if (auto res = getCache()->lookup(store, immutableAttrs)) {
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input.attrs.insert_or_assign("lastModified", getIntAttr(res->first, "lastModified"));
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return {
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Tree(store->toRealPath(res->second), std::move(res->second)),
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input
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};
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}
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auto url = getDownloadUrl(input);
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auto [tree, lastModified] = downloadTarball(store, url, "source", true);
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input.attrs.insert_or_assign("lastModified", lastModified);
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getCache()->add(
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store,
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immutableAttrs,
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{
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{"rev", rev->gitRev()},
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{"lastModified", lastModified}
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},
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tree.storePath,
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true);
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return {std::move(tree), input};
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}
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};
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struct GitHubInputScheme : GitArchiveInputScheme
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{
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std::string type() override { return "github"; }
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Hash getRevFromRef(nix::ref<Store> store, const Input & input) const override
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{
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auto url = fmt("https://api.github.com/repos/%s/%s/commits/%s",
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getStrAttr(input.attrs, "owner"), getStrAttr(input.attrs, "repo"), *input.getRef());
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auto json = nlohmann::json::parse(
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readFile(
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store->toRealPath(
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downloadFile(store, url, "source", false).storePath)));
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auto rev = Hash(json["sha"], htSHA1);
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debug("HEAD revision for '%s' is %s", url, rev.gitRev());
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return rev;
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}
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std::string getDownloadUrl(const Input & input) const override
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{
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// FIXME: use regular /archive URLs instead? api.github.com
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// might have stricter rate limits.
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auto url = fmt("https://api.github.com/repos/%s/%s/tarball/%s",
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getStrAttr(input.attrs, "owner"), getStrAttr(input.attrs, "repo"),
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input.getRev()->to_string(Base16, false));
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std::string accessToken = settings.githubAccessToken.get();
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if (accessToken != "")
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url += "?access_token=" + accessToken;
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return url;
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}
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void clone(const Input & input, const Path & destDir) override
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{
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Input::fromURL(fmt("git+ssh://git@github.com/%s/%s.git",
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getStrAttr(input.attrs, "owner"), getStrAttr(input.attrs, "repo")))
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.applyOverrides(input.getRef().value_or("master"), input.getRev())
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.clone(destDir);
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}
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};
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struct GitLabInputScheme : GitArchiveInputScheme
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{
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std::string type() override { return "gitlab"; }
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Hash getRevFromRef(nix::ref<Store> store, const Input & input) const override
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{
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auto url = fmt("https://gitlab.com/api/v4/projects/%s%%2F%s/repository/branches/%s",
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getStrAttr(input.attrs, "owner"), getStrAttr(input.attrs, "repo"), *input.getRef());
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auto json = nlohmann::json::parse(
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readFile(
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store->toRealPath(
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downloadFile(store, url, "source", false).storePath)));
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auto rev = Hash(json["commit"]["id"], htSHA1);
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debug("HEAD revision for '%s' is %s", url, rev.gitRev());
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return rev;
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}
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std::string getDownloadUrl(const Input & input) const override
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{
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// FIXME: This endpoint has a rate limit threshold of 5 requests per minute.
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auto url = fmt("https://gitlab.com/api/v4/projects/%s%%2F%s/repository/archive.tar.gz?sha=%s",
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getStrAttr(input.attrs, "owner"), getStrAttr(input.attrs, "repo"),
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input.getRev()->to_string(Base16, false));
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/* # FIXME: add privat token auth (`curl --header "PRIVATE-TOKEN: <your_access_token>"`)
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std::string accessToken = settings.githubAccessToken.get();
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if (accessToken != "")
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url += "?access_token=" + accessToken;*/
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return url;
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}
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void clone(const Input & input, const Path & destDir) override
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{
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Input::fromURL(fmt("git+ssh://git@gitlab.com/%s/%s.git",
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getStrAttr(input.attrs, "owner"), getStrAttr(input.attrs, "repo")))
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.applyOverrides(input.getRef().value_or("master"), input.getRev())
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.clone(destDir);
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}
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};
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static auto r1 = OnStartup([] { registerInputScheme(std::make_unique<GitHubInputScheme>()); });
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static auto r2 = OnStartup([] { registerInputScheme(std::make_unique<GitLabInputScheme>()); });
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}
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