diff options
Diffstat (limited to 'src/libfetchers/mercurial.cc')
| -rw-r--r-- | src/libfetchers/mercurial.cc | 338 |
1 files changed, 338 insertions, 0 deletions
diff --git a/src/libfetchers/mercurial.cc b/src/libfetchers/mercurial.cc new file mode 100644 index 000000000..4b73fbcbe --- /dev/null +++ b/src/libfetchers/mercurial.cc @@ -0,0 +1,338 @@ +#include "fetchers.hh" +#include "cache.hh" +#include "globals.hh" +#include "tarfile.hh" +#include "store-api.hh" + +#include <sys/time.h> + +using namespace std::string_literals; + +namespace nix::fetchers { + +struct MercurialInput : Input +{ + ParsedURL url; + std::optional<std::string> ref; + std::optional<Hash> rev; + + MercurialInput(const ParsedURL & url) : url(url) + { } + + std::string type() const override { return "hg"; } + + bool operator ==(const Input & other) const override + { + auto other2 = dynamic_cast<const MercurialInput *>(&other); + return + other2 + && url == other2->url + && 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; } + + ParsedURL toURL() const override + { + ParsedURL url2(url); + url2.scheme = "hg+" + url2.scheme; + if (rev) url2.query.insert_or_assign("rev", rev->gitRev()); + if (ref) url2.query.insert_or_assign("ref", *ref); + return url; + } + + Attrs toAttrsInternal() const override + { + Attrs attrs; + attrs.emplace("url", url.to_string()); + 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<MercurialInput>(*this); + + if (ref) res->ref = ref; + if (rev) res->rev = rev; + + return res; + } + + std::optional<Path> getSourcePath() const + { + if (url.scheme == "file" && !ref && !rev) + return url.path; + return {}; + } + + void markChangedFile(std::string_view file, std::optional<std::string> commitMsg) const override + { + auto sourcePath = getSourcePath(); + assert(sourcePath); + + // FIXME: shut up if file is already tracked. + runProgram("hg", true, + { "add", *sourcePath + "/" + std::string(file) }); + + if (commitMsg) + runProgram("hg", true, + { "commit", *sourcePath + "/" + std::string(file), "-m", *commitMsg }); + } + + std::pair<bool, std::string> getActualUrl() const + { + bool isLocal = url.scheme == "file"; + return {isLocal, isLocal ? url.path : url.base}; + } + + std::pair<Tree, std::shared_ptr<const Input>> fetchTreeInternal(nix::ref<Store> store) const override + { + auto name = "source"; + + auto input = std::make_shared<MercurialInput>(*this); + + auto [isLocal, actualUrl_] = getActualUrl(); + auto actualUrl = actualUrl_; // work around clang bug + + // FIXME: return lastModified. + + // FIXME: don't clone local repositories. + + if (!input->ref && !input->rev && isLocal && pathExists(actualUrl + "/.hg")) { + + bool clean = runProgram("hg", true, { "status", "-R", actualUrl, "--modified", "--added", "--removed" }) == ""; + + if (!clean) { + + /* This is an unclean working tree. So copy all tracked + files. */ + + if (!settings.allowDirty) + throw Error("Mercurial tree '%s' is unclean", actualUrl); + + if (settings.warnDirty) + warn("Mercurial tree '%s' is unclean", actualUrl); + + input->ref = chomp(runProgram("hg", true, { "branch", "-R", actualUrl })); + + auto files = tokenizeString<std::set<std::string>>( + runProgram("hg", true, { "status", "-R", actualUrl, "--clean", "--modified", "--added", "--no-status", "--print0" }), "\0"s); + + PathFilter filter = [&](const Path & p) -> bool { + assert(hasPrefix(p, actualUrl)); + std::string file(p, actualUrl.size() + 1); + + auto st = lstat(p); + + if (S_ISDIR(st.st_mode)) { + auto prefix = file + "/"; + auto i = files.lower_bound(prefix); + return i != files.end() && hasPrefix(*i, prefix); + } + + return files.count(file); + }; + + auto storePath = store->addToStore("source", actualUrl, true, htSHA256, filter); + + return {Tree { + .actualPath = store->printStorePath(storePath), + .storePath = std::move(storePath), + }, input}; + } + } + + if (!input->ref) input->ref = "default"; + + auto getImmutableAttrs = [&]() + { + return Attrs({ + {"type", "hg"}, + {"name", name}, + {"rev", input->rev->gitRev()}, + }); + }; + + auto makeResult = [&](const Attrs & infoAttrs, StorePath && storePath) + -> std::pair<Tree, std::shared_ptr<const Input>> + { + assert(input->rev); + assert(!rev || rev == input->rev); + return { + Tree{ + .actualPath = store->toRealPath(storePath), + .storePath = std::move(storePath), + .info = TreeInfo { + .revCount = getIntAttr(infoAttrs, "revCount"), + }, + }, + input + }; + }; + + if (input->rev) { + if (auto res = getCache()->lookup(store, getImmutableAttrs())) + return makeResult(res->first, std::move(res->second)); + } + + assert(input->rev || input->ref); + auto revOrRef = input->rev ? input->rev->gitRev() : *input->ref; + + Attrs mutableAttrs({ + {"type", "hg"}, + {"name", name}, + {"url", actualUrl}, + {"ref", *input->ref}, + }); + + if (auto res = getCache()->lookup(store, mutableAttrs)) { + auto rev2 = Hash(getStrAttr(res->first, "rev"), htSHA1); + if (!rev || rev == rev2) { + input->rev = rev2; + return makeResult(res->first, std::move(res->second)); + } + } + + Path cacheDir = fmt("%s/nix/hg/%s", getCacheDir(), hashString(htSHA256, actualUrl).to_string(Base32, false)); + + /* If this is a commit hash that we already have, we don't + have to pull again. */ + if (!(input->rev + && pathExists(cacheDir) + && runProgram( + RunOptions("hg", { "log", "-R", cacheDir, "-r", input->rev->gitRev(), "--template", "1" }) + .killStderr(true)).second == "1")) + { + Activity act(*logger, lvlTalkative, actUnknown, fmt("fetching Mercurial repository '%s'", actualUrl)); + + if (pathExists(cacheDir)) { + try { + runProgram("hg", true, { "pull", "-R", cacheDir, "--", actualUrl }); + } + catch (ExecError & e) { + string transJournal = cacheDir + "/.hg/store/journal"; + /* hg throws "abandoned transaction" error only if this file exists */ + if (pathExists(transJournal)) { + runProgram("hg", true, { "recover", "-R", cacheDir }); + runProgram("hg", true, { "pull", "-R", cacheDir, "--", actualUrl }); + } else { + throw ExecError(e.status, fmt("'hg pull' %s", statusToString(e.status))); + } + } + } else { + createDirs(dirOf(cacheDir)); + runProgram("hg", true, { "clone", "--noupdate", "--", actualUrl, cacheDir }); + } + } + + auto tokens = tokenizeString<std::vector<std::string>>( + runProgram("hg", true, { "log", "-R", cacheDir, "-r", revOrRef, "--template", "{node} {rev} {branch}" })); + assert(tokens.size() == 3); + + input->rev = Hash(tokens[0], htSHA1); + auto revCount = std::stoull(tokens[1]); + input->ref = tokens[2]; + + if (auto res = getCache()->lookup(store, getImmutableAttrs())) + return makeResult(res->first, std::move(res->second)); + + Path tmpDir = createTempDir(); + AutoDelete delTmpDir(tmpDir, true); + + runProgram("hg", true, { "archive", "-R", cacheDir, "-r", input->rev->gitRev(), tmpDir }); + + deletePath(tmpDir + "/.hg_archival.txt"); + + auto storePath = store->addToStore(name, tmpDir); + + Attrs infoAttrs({ + {"rev", input->rev->gitRev()}, + {"revCount", (int64_t) revCount}, + }); + + if (!this->rev) + getCache()->add( + store, + mutableAttrs, + infoAttrs, + storePath, + false); + + getCache()->add( + store, + getImmutableAttrs(), + infoAttrs, + storePath, + true); + + return makeResult(infoAttrs, std::move(storePath)); + } +}; + +struct MercurialInputScheme : InputScheme +{ + std::unique_ptr<Input> inputFromURL(const ParsedURL & url) override + { + if (url.scheme != "hg+http" && + url.scheme != "hg+https" && + url.scheme != "hg+ssh" && + url.scheme != "hg+file") return nullptr; + + auto url2(url); + url2.scheme = std::string(url2.scheme, 3); + url2.query.clear(); + + Attrs attrs; + attrs.emplace("type", "hg"); + + for (auto &[name, value] : url.query) { + if (name == "rev" || name == "ref") + attrs.emplace(name, value); + else + url2.query.emplace(name, value); + } + + attrs.emplace("url", url2.to_string()); + + return inputFromAttrs(attrs); + } + + std::unique_ptr<Input> inputFromAttrs(const Attrs & attrs) override + { + if (maybeGetStrAttr(attrs, "type") != "hg") return {}; + + for (auto & [name, value] : attrs) + if (name != "type" && name != "url" && name != "ref" && name != "rev") + throw Error("unsupported Mercurial input attribute '%s'", name); + + auto input = std::make_unique<MercurialInput>(parseURL(getStrAttr(attrs, "url"))); + if (auto ref = maybeGetStrAttr(attrs, "ref")) { + if (!std::regex_match(*ref, refRegex)) + throw BadURL("invalid Mercurial branch/tag name '%s'", *ref); + input->ref = *ref; + } + if (auto rev = maybeGetStrAttr(attrs, "rev")) + input->rev = Hash(*rev, htSHA1); + return input; + } +}; + +static auto r1 = OnStartup([] { registerInputScheme(std::make_unique<MercurialInputScheme>()); }); + +} |