forked from lix-project/lix
402 lines
14 KiB
C++
402 lines
14 KiB
C++
#include "fetchers.hh"
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#include "cache.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 <sys/time.h>
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using namespace std::string_literals;
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namespace nix::fetchers {
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static std::string readHead(const Path & path)
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{
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return chomp(runProgram("git", true, { "-C", path, "rev-parse", "--abbrev-ref", "HEAD" }));
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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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bool shallow = false;
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GitInput(const ParsedURL & url) : url(url)
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{ }
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std::string type() const override { return "git"; }
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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 == other2->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 || narHash;
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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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ParsedURL toURL() const override
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{
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ParsedURL url2(url);
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if (url2.scheme != "git") url2.scheme = "git+" + url2.scheme;
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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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if (shallow) url2.query.insert_or_assign("shallow", "1");
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return url2;
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}
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Attrs toAttrsInternal() const override
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{
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Attrs attrs;
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attrs.emplace("url", url.to_string());
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if (ref)
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attrs.emplace("ref", *ref);
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if (rev)
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attrs.emplace("rev", rev->gitRev());
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if (shallow)
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attrs.emplace("shallow", true);
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return attrs;
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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 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 == "file" && !forceHttp;
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return {isLocal, isLocal ? url.path : url.base};
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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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auto cacheType = shallow ? "git-shallow" : "git";
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auto getImmutableAttrs = [&]()
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{
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return Attrs({
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{"type", cacheType},
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{"name", name},
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{"rev", input->rev->gitRev()},
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});
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};
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auto makeResult = [&](const Attrs & infoAttrs, StorePath && storePath)
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-> std::pair<Tree, std::shared_ptr<const Input>>
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{
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assert(input->rev);
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assert(!rev || rev == input->rev);
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return {
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Tree {
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.actualPath = store->toRealPath(storePath),
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.storePath = std::move(storePath),
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.info = TreeInfo {
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.revCount = shallow ? std::nullopt : std::optional(getIntAttr(infoAttrs, "revCount")),
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.lastModified = getIntAttr(infoAttrs, "lastModified"),
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},
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},
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input
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};
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};
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if (rev) {
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if (auto res = getCache()->lookup(store, getImmutableAttrs()))
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return makeResult(res->first, std::move(res->second));
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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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auto gitDir = actualUrl + "/.git";
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auto commonGitDir = chomp(runProgram(
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"git",
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true,
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{ "-C", actualUrl, "rev-parse", "--git-common-dir" }
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));
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if (commonGitDir != ".git")
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gitDir = commonGitDir;
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bool haveCommits = !readDirectory(gitDir + "/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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.info = TreeInfo {
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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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};
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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 ? readHead(actualUrl) : "master";
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Attrs mutableAttrs({
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{"type", cacheType},
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{"name", name},
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{"url", actualUrl},
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{"ref", *input->ref},
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});
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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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if (auto res = getCache()->lookup(store, mutableAttrs)) {
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auto rev2 = Hash(getStrAttr(res->first, "rev"), htSHA1);
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if (!rev || rev == rev2) {
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input->rev = rev2;
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return makeResult(res->first, std::move(res->second));
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}
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}
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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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bool isShallow = chomp(runProgram("git", true, { "-C", repoDir, "rev-parse", "--is-shallow-repository" })) == "true";
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if (isShallow && !shallow)
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throw Error("'%s' is a shallow Git repository, but a non-shallow repository is needed", actualUrl);
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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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/* Now that we know the ref, check again whether we have it in
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the store. */
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if (auto res = getCache()->lookup(store, getImmutableAttrs()))
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return makeResult(res->first, std::move(res->second));
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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 lastModified = std::stoull(runProgram("git", true, { "-C", repoDir, "log", "-1", "--format=%ct", input->rev->gitRev() }));
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Attrs infoAttrs({
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{"rev", input->rev->gitRev()},
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{"lastModified", lastModified},
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});
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if (!shallow)
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infoAttrs.insert_or_assign("revCount",
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std::stoull(runProgram("git", true, { "-C", repoDir, "rev-list", "--count", input->rev->gitRev() })));
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if (!this->rev)
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getCache()->add(
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store,
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mutableAttrs,
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infoAttrs,
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storePath,
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false);
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getCache()->add(
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store,
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getImmutableAttrs(),
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infoAttrs,
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storePath,
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true);
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return makeResult(infoAttrs, std::move(storePath));
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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 url2(url);
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if (hasPrefix(url2.scheme, "git+")) url2.scheme = std::string(url2.scheme, 4);
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url2.query.clear();
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Attrs attrs;
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attrs.emplace("type", "git");
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for (auto &[name, value] : url.query) {
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if (name == "rev" || name == "ref")
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attrs.emplace(name, value);
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else
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url2.query.emplace(name, value);
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}
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attrs.emplace("url", url2.to_string());
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return inputFromAttrs(attrs);
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}
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std::unique_ptr<Input> inputFromAttrs(const Attrs & attrs) override
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{
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if (maybeGetStrAttr(attrs, "type") != "git") return {};
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for (auto & [name, value] : attrs)
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if (name != "type" && name != "url" && name != "ref" && name != "rev" && name != "shallow")
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throw Error("unsupported Git input attribute '%s'", name);
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auto input = std::make_unique<GitInput>(parseURL(getStrAttr(attrs, "url")));
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if (auto ref = maybeGetStrAttr(attrs, "ref")) {
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if (!std::regex_match(*ref, refRegex))
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throw BadURL("invalid Git branch/tag name '%s'", *ref);
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input->ref = *ref;
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}
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if (auto rev = maybeGetStrAttr(attrs, "rev"))
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input->rev = Hash(*rev, htSHA1);
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input->shallow = maybeGetBoolAttr(attrs, "shallow").value_or(false);
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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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