diff options
Diffstat (limited to 'src/libstore/fetchers/github.cc')
| -rw-r--r-- | src/libstore/fetchers/github.cc | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/src/libstore/fetchers/github.cc b/src/libstore/fetchers/github.cc new file mode 100644 index 000000000..c75680649 --- /dev/null +++ b/src/libstore/fetchers/github.cc @@ -0,0 +1,183 @@ +#include "fetchers.hh" +#include "download.hh" +#include "globals.hh" +#include "parse.hh" +#include "regex.hh" +#include "store-api.hh" + +#include <nlohmann/json.hpp> + +namespace nix::fetchers { + +std::regex ownerRegex("[a-zA-Z][a-zA-Z0-9_-]*", std::regex::ECMAScript); +std::regex repoRegex("[a-zA-Z][a-zA-Z0-9_-]*", std::regex::ECMAScript); + +struct GitHubInput : Input +{ + std::string owner; + std::string repo; + std::optional<std::string> ref; + std::optional<Hash> rev; + + bool operator ==(const Input & other) const override + { + auto other2 = dynamic_cast<const GitHubInput *>(&other); + return + other2 + && owner == other2->owner + && repo == other2->repo + && rev == other2->rev + && ref == other2->ref; + } + + bool isImmutable() const override + { + return (bool) rev; + } + + std::optional<std::string> getRef() const override { return ref; } + + std::optional<Hash> getRev() const override { return rev; } + + std::string to_string() const override + { + auto s = fmt("github:%s/%s", owner, repo); + assert(!(ref && rev)); + if (ref) s += "/" + *ref; + if (rev) s += "/" + rev->to_string(Base16, false); + return s; + } + + void clone(const Path & destDir) const override + { + std::shared_ptr<const Input> input = inputFromURL(fmt("git+ssh://git@github.com/%s/%s.git", owner, repo)); + input = input->applyOverrides(ref.value_or("master"), rev); + input->clone(destDir); + } + + std::pair<Tree, std::shared_ptr<const Input>> fetchTreeInternal(nix::ref<Store> store) const override + { + auto rev = this->rev; + + #if 0 + if (rev) { + if (auto gitInfo = lookupGitInfo(store, "source", *rev)) + return *gitInfo; + } + #endif + + if (!rev) { + auto url = fmt("https://api.github.com/repos/%s/%s/commits/%s", + owner, repo, ref ? *ref : "master"); + CachedDownloadRequest request(url); + request.ttl = rev ? 1000000000 : settings.tarballTtl; + auto result = getDownloader()->downloadCached(store, request); + auto json = nlohmann::json::parse(readFile(result.path)); + rev = Hash(json["sha"], htSHA1); + debug("HEAD revision for '%s' is %s", url, rev->gitRev()); + } + + // FIXME: use regular /archive URLs instead? api.github.com + // might have stricter rate limits. + + auto url = fmt("https://api.github.com/repos/%s/%s/tarball/%s", + owner, repo, rev->to_string(Base16, false)); + + std::string accessToken = settings.githubAccessToken.get(); + if (accessToken != "") + url += "?access_token=" + accessToken; + + CachedDownloadRequest request(url); + request.unpack = true; + request.name = "source"; + request.ttl = 1000000000; + request.getLastModified = true; + auto dresult = getDownloader()->downloadCached(store, request); + + assert(dresult.lastModified); + + Tree result{ + .actualPath = dresult.path, + .storePath = store->parseStorePath(dresult.storePath), + .rev = *rev, + .lastModified = *dresult.lastModified + }; + + #if 0 + // FIXME: this can overwrite a cache file that contains a revCount. + cacheGitInfo("source", gitInfo); + #endif + + auto input = std::make_shared<GitHubInput>(*this); + input->ref = {}; + input->rev = *rev; + + return {std::move(result), input}; + } + + 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<GitHubInput>(*this); + + if (ref) res->ref = ref; + if (rev) res->rev = rev; + + return res; + } +}; + +struct GitHubInputScheme : InputScheme +{ + std::unique_ptr<Input> inputFromURL(const ParsedURL & url) override + { + if (url.scheme != "github") return nullptr; + + auto path = tokenizeString<std::vector<std::string>>(url.path, "/"); + auto input = std::make_unique<GitHubInput>(); + input->type = "github"; + + if (path.size() == 2) { + } else if (path.size() == 3) { + if (std::regex_match(path[2], revRegex)) + input->rev = Hash(path[2], htSHA1); + else if (std::regex_match(path[2], refRegex)) + input->ref = path[2]; + else + throw BadURL("in GitHub URL '%s', '%s' is not a commit hash or branch/tag name", url.url, path[2]); + } else + throw BadURL("GitHub URL '%s' is invalid", url.url); + + for (auto &[name, value] : url.query) { + if (name == "rev") { + if (!std::regex_match(value, revRegex)) + throw BadURL("GitHub URL '%s' contains an invalid commit hash", url.url); + if (input->rev) + throw BadURL("GitHub URL '%s' contains multiple commit hashes", url.url); + input->rev = Hash(value, htSHA1); + } + else if (name == "ref") { + if (!std::regex_match(value, refRegex)) + throw BadURL("GitHub URL '%s' contains an invalid branch/tag name", url.url); + if (input->ref) + throw BadURL("GitHub URL '%s' contains multiple branch/tag names", url.url); + input->ref = value; + } + } + + if (input->ref && input->rev) + throw BadURL("GitHub URL '%s' contains both a commit hash and a branch/tag name", url.url); + + input->owner = path[0]; + input->repo = path[1]; + + return input; + } +}; + +static auto r1 = OnStartup([] { registerInputScheme(std::make_unique<GitHubInputScheme>()); }); + +} |