forked from lix-project/lix
384 lines
12 KiB
C++
384 lines
12 KiB
C++
#include "fetchers.hh"
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#include "parse.hh"
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#include "globals.hh"
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#include "tarfile.hh"
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#include "store-api.hh"
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#include "regex.hh"
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#include <sys/time.h>
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#include <nlohmann/json.hpp>
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using namespace std::string_literals;
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namespace nix::fetchers {
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static Path getCacheInfoPathFor(const std::string & name, const Hash & rev)
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{
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Path cacheDir = getCacheDir() + "/nix/git-revs-v2";
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std::string linkName =
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name == "source"
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? rev.gitRev()
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: hashString(htSHA512, name + std::string("\0"s) + rev.gitRev()).to_string(Base32, false);
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return cacheDir + "/" + linkName + ".link";
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}
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static void cacheGitInfo(Store & store, const std::string & name, const Tree & tree)
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{
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nlohmann::json json;
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json["storePath"] = store.printStorePath(tree.storePath);
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json["name"] = name;
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json["rev"] = tree.rev->gitRev();
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json["revCount"] = *tree.revCount;
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json["lastModified"] = *tree.lastModified;
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auto cacheInfoPath = getCacheInfoPathFor(name, *tree.rev);
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createDirs(dirOf(cacheInfoPath));
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writeFile(cacheInfoPath, json.dump());
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}
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static std::optional<Tree> lookupGitInfo(
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ref<Store> store,
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const std::string & name,
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const Hash & rev)
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{
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try {
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auto json = nlohmann::json::parse(readFile(getCacheInfoPathFor(name, rev)));
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assert(json["name"] == name && Hash((std::string) json["rev"], htSHA1) == rev);
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auto storePath = store->parseStorePath((std::string) json["storePath"]);
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if (store->isValidPath(storePath)) {
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Tree tree{
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.actualPath = store->toRealPath(store->printStorePath(storePath)),
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.storePath = std::move(storePath),
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.rev = rev,
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.revCount = json["revCount"],
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.lastModified = json["lastModified"],
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};
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return tree;
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}
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} catch (SysError & e) {
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if (e.errNo != ENOENT) throw;
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}
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return {};
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}
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struct GitInput : Input
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{
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ParsedURL url;
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std::optional<std::string> ref;
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std::optional<Hash> rev;
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GitInput(const ParsedURL & url) : url(url)
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{
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type = "git";
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}
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bool operator ==(const Input & other) const override
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{
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auto other2 = dynamic_cast<const GitInput *>(&other);
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return
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other2
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&& url.url == other2->url.url
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&& rev == other2->rev
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&& ref == other2->ref;
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}
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bool isImmutable() const override
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{
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return (bool) rev;
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}
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std::optional<std::string> getRef() const override { return ref; }
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std::optional<Hash> getRev() const override { return rev; }
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std::string to_string() const override
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{
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ParsedURL url2(url);
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if (rev) url2.query.insert_or_assign("rev", rev->gitRev());
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if (ref) url2.query.insert_or_assign("ref", *ref);
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return url2.to_string();
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}
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void clone(const Path & destDir) const override
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{
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auto [isLocal, actualUrl] = getActualUrl();
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Strings args = {"clone"};
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args.push_back(actualUrl);
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if (ref) {
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args.push_back("--branch");
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args.push_back(*ref);
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}
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if (rev) throw Error("cloning a specific revision is not implemented");
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args.push_back(destDir);
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runProgram("git", true, args);
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}
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std::shared_ptr<const Input> applyOverrides(
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std::optional<std::string> ref,
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std::optional<Hash> rev) const override
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{
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if (!ref && !rev) return shared_from_this();
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auto res = std::make_shared<GitInput>(*this);
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if (ref) res->ref = ref;
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if (rev) res->rev = rev;
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if (!res->ref && res->rev)
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throw Error("Git input '%s' has a commit hash but no branch/tag name", res->to_string());
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return res;
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}
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std::optional<Path> getSourcePath() const override
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{
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if (url.scheme == "git+file" && !ref && !rev)
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return url.path;
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return {};
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}
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std::pair<bool, std::string> getActualUrl() const
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{
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// Don't clone git+file:// URIs (but otherwise treat them the
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// same as remote URIs, i.e. don't use the working tree or
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// HEAD).
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static bool forceHttp = getEnv("_NIX_FORCE_HTTP") == "1"; // for testing
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bool isLocal = url.scheme == "git+file" && !forceHttp;
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return {isLocal, isLocal ? url.path : std::string(url.base, 4)};
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}
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std::pair<Tree, std::shared_ptr<const Input>> fetchTreeInternal(nix::ref<Store> store) const override
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{
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auto name = "source";
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auto input = std::make_shared<GitInput>(*this);
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assert(!rev || rev->type == htSHA1);
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if (rev) {
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if (auto tree = lookupGitInfo(store, name, *rev))
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return {std::move(*tree), input};
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}
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auto [isLocal, actualUrl_] = getActualUrl();
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auto actualUrl = actualUrl_; // work around clang bug
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// If this is a local directory and no ref or revision is
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// given, then allow the use of an unclean working tree.
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if (!input->ref && !input->rev && isLocal) {
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bool clean = false;
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/* Check whether this repo has any commits. There are
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probably better ways to do this. */
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bool haveCommits = !readDirectory(actualUrl + "/.git/refs/heads").empty();
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try {
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if (haveCommits) {
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runProgram("git", true, { "-C", actualUrl, "diff-index", "--quiet", "HEAD", "--" });
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clean = true;
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}
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} catch (ExecError & e) {
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if (!WIFEXITED(e.status) || WEXITSTATUS(e.status) != 1) throw;
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}
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if (!clean) {
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/* This is an unclean working tree. So copy all tracked files. */
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if (!settings.allowDirty)
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throw Error("Git tree '%s' is dirty", actualUrl);
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if (settings.warnDirty)
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warn("Git tree '%s' is dirty", actualUrl);
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auto files = tokenizeString<std::set<std::string>>(
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runProgram("git", true, { "-C", actualUrl, "ls-files", "-z" }), "\0"s);
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PathFilter filter = [&](const Path & p) -> bool {
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assert(hasPrefix(p, actualUrl));
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std::string file(p, actualUrl.size() + 1);
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auto st = lstat(p);
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if (S_ISDIR(st.st_mode)) {
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auto prefix = file + "/";
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auto i = files.lower_bound(prefix);
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return i != files.end() && hasPrefix(*i, prefix);
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}
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return files.count(file);
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};
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auto storePath = store->addToStore("source", actualUrl, true, htSHA256, filter);
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auto tree = Tree {
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.actualPath = store->printStorePath(storePath),
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.storePath = std::move(storePath),
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.revCount = haveCommits ? std::stoull(runProgram("git", true, { "-C", actualUrl, "rev-list", "--count", "HEAD" })) : 0,
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// FIXME: maybe we should use the timestamp of the last
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// modified dirty file?
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.lastModified = haveCommits ? std::stoull(runProgram("git", true, { "-C", actualUrl, "log", "-1", "--format=%ct", "HEAD" })) : 0,
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};
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return {std::move(tree), input};
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}
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}
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if (!input->ref) input->ref = isLocal ? "HEAD" : "master";
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Path repoDir;
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if (isLocal) {
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if (!input->rev)
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input->rev = Hash(chomp(runProgram("git", true, { "-C", actualUrl, "rev-parse", *input->ref })), htSHA1);
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repoDir = actualUrl;
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} else {
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Path cacheDir = getCacheDir() + "/nix/gitv3/" + hashString(htSHA256, actualUrl).to_string(Base32, false);
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repoDir = cacheDir;
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if (!pathExists(cacheDir)) {
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createDirs(dirOf(cacheDir));
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runProgram("git", true, { "init", "--bare", repoDir });
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}
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Path localRefFile =
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input->ref->compare(0, 5, "refs/") == 0
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? cacheDir + "/" + *input->ref
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: cacheDir + "/refs/heads/" + *input->ref;
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bool doFetch;
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time_t now = time(0);
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/* If a rev was specified, we need to fetch if it's not in the
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repo. */
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if (input->rev) {
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try {
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runProgram("git", true, { "-C", repoDir, "cat-file", "-e", input->rev->gitRev() });
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doFetch = false;
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} catch (ExecError & e) {
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if (WIFEXITED(e.status)) {
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doFetch = true;
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} else {
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throw;
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}
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}
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} else {
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/* If the local ref is older than ‘tarball-ttl’ seconds, do a
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git fetch to update the local ref to the remote ref. */
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struct stat st;
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doFetch = stat(localRefFile.c_str(), &st) != 0 ||
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(uint64_t) st.st_mtime + settings.tarballTtl <= (uint64_t) now;
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}
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if (doFetch) {
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Activity act(*logger, lvlTalkative, actUnknown, fmt("fetching Git repository '%s'", actualUrl));
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// FIXME: git stderr messes up our progress indicator, so
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// we're using --quiet for now. Should process its stderr.
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try {
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runProgram("git", true, { "-C", repoDir, "fetch", "--quiet", "--force", "--", actualUrl, fmt("%s:%s", *input->ref, *input->ref) });
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} catch (Error & e) {
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if (!pathExists(localRefFile)) throw;
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warn("could not update local clone of Git repository '%s'; continuing with the most recent version", actualUrl);
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}
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struct timeval times[2];
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times[0].tv_sec = now;
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times[0].tv_usec = 0;
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times[1].tv_sec = now;
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times[1].tv_usec = 0;
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utimes(localRefFile.c_str(), times);
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}
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if (!input->rev)
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input->rev = Hash(chomp(readFile(localRefFile)), htSHA1);
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}
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if (auto tree = lookupGitInfo(store, name, *input->rev))
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return {std::move(*tree), input};
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// FIXME: check whether rev is an ancestor of ref.
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printTalkative("using revision %s of repo '%s'", input->rev->gitRev(), actualUrl);
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// FIXME: should pipe this, or find some better way to extract a
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// revision.
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auto source = sinkToSource([&](Sink & sink) {
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RunOptions gitOptions("git", { "-C", repoDir, "archive", input->rev->gitRev() });
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gitOptions.standardOut = &sink;
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runProgram2(gitOptions);
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});
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Path tmpDir = createTempDir();
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AutoDelete delTmpDir(tmpDir, true);
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unpackTarfile(*source, tmpDir);
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auto storePath = store->addToStore(name, tmpDir);
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auto revCount = std::stoull(runProgram("git", true, { "-C", repoDir, "rev-list", "--count", input->rev->gitRev() }));
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auto lastModified = std::stoull(runProgram("git", true, { "-C", repoDir, "log", "-1", "--format=%ct", input->rev->gitRev() }));
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auto tree = Tree {
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.actualPath = store->toRealPath(store->printStorePath(storePath)),
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.storePath = std::move(storePath),
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.rev = input->rev,
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.revCount = revCount,
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.lastModified = lastModified,
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};
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cacheGitInfo(*store, name, tree);
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return {std::move(tree), input};
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}
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};
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struct GitInputScheme : InputScheme
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{
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std::unique_ptr<Input> inputFromURL(const ParsedURL & url) override
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{
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if (url.scheme != "git" &&
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url.scheme != "git+http" &&
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url.scheme != "git+https" &&
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url.scheme != "git+ssh" &&
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url.scheme != "git+file") return nullptr;
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auto input = std::make_unique<GitInput>(url);
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for (auto &[name, value] : url.query) {
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if (name == "rev") {
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if (!std::regex_match(value, revRegex))
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throw BadURL("Git URL '%s' contains an invalid commit hash", url.url);
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input->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("Git URL '%s' contains an invalid branch/tag name", url.url);
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input->ref = value;
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}
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}
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return input;
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}
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};
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static auto r1 = OnStartup([] { registerInputScheme(std::make_unique<GitInputScheme>()); });
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}
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