mirror of
https://github.com/NixOS/nix
synced 2025-07-06 21:41:48 +02:00
Move fetchers from libstore to libfetchers
This commit is contained in:
Eelco Dolstra
parent
4ba4c7ff66
commit
e0a0ae0467
35 changed files with 80 additions and 90 deletions
338
src/libfetchers/mercurial.cc
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338
src/libfetchers/mercurial.cc
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#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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struct MercurialInput : 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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MercurialInput(const ParsedURL & url) : url(url)
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{ }
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std::string type() const override { return "hg"; }
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bool operator ==(const Input & other) const override
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{
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auto other2 = dynamic_cast<const MercurialInput *>(&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;
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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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url2.scheme = "hg+" + 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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return url;
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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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return attrs;
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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<MercurialInput>(*this);
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if (ref) res->ref = ref;
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if (rev) res->rev = rev;
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return res;
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}
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std::optional<Path> getSourcePath() const
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{
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if (url.scheme == "file" && !ref && !rev)
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return url.path;
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return {};
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}
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void markChangedFile(std::string_view file, std::optional<std::string> commitMsg) const override
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{
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auto sourcePath = getSourcePath();
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assert(sourcePath);
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// FIXME: shut up if file is already tracked.
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runProgram("hg", true,
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{ "add", *sourcePath + "/" + std::string(file) });
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if (commitMsg)
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runProgram("hg", true,
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{ "commit", *sourcePath + "/" + std::string(file), "-m", *commitMsg });
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}
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std::pair<bool, std::string> getActualUrl() const
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{
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bool isLocal = url.scheme == "file";
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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<MercurialInput>(*this);
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auto [isLocal, actualUrl_] = getActualUrl();
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auto actualUrl = actualUrl_; // work around clang bug
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// FIXME: return lastModified.
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// FIXME: don't clone local repositories.
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if (!input->ref && !input->rev && isLocal && pathExists(actualUrl + "/.hg")) {
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bool clean = runProgram("hg", true, { "status", "-R", actualUrl, "--modified", "--added", "--removed" }) == "";
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if (!clean) {
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/* This is an unclean working tree. So copy all tracked
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files. */
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if (!settings.allowDirty)
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throw Error("Mercurial tree '%s' is unclean", actualUrl);
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if (settings.warnDirty)
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warn("Mercurial tree '%s' is unclean", actualUrl);
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input->ref = chomp(runProgram("hg", true, { "branch", "-R", actualUrl }));
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auto files = tokenizeString<std::set<std::string>>(
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runProgram("hg", true, { "status", "-R", actualUrl, "--clean", "--modified", "--added", "--no-status", "--print0" }), "\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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return {Tree {
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.actualPath = store->printStorePath(storePath),
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.storePath = std::move(storePath),
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}, input};
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}
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}
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if (!input->ref) input->ref = "default";
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auto getImmutableAttrs = [&]()
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{
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return Attrs({
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{"type", "hg"},
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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 = getIntAttr(infoAttrs, "revCount"),
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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 (input->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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assert(input->rev || input->ref);
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auto revOrRef = input->rev ? input->rev->gitRev() : *input->ref;
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Attrs mutableAttrs({
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{"type", "hg"},
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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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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 = fmt("%s/nix/hg/%s", getCacheDir(), hashString(htSHA256, actualUrl).to_string(Base32, false));
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/* If this is a commit hash that we already have, we don't
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have to pull again. */
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if (!(input->rev
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&& pathExists(cacheDir)
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&& runProgram(
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RunOptions("hg", { "log", "-R", cacheDir, "-r", input->rev->gitRev(), "--template", "1" })
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.killStderr(true)).second == "1"))
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{
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Activity act(*logger, lvlTalkative, actUnknown, fmt("fetching Mercurial repository '%s'", actualUrl));
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if (pathExists(cacheDir)) {
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try {
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runProgram("hg", true, { "pull", "-R", cacheDir, "--", actualUrl });
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}
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catch (ExecError & e) {
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string transJournal = cacheDir + "/.hg/store/journal";
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/* hg throws "abandoned transaction" error only if this file exists */
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if (pathExists(transJournal)) {
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runProgram("hg", true, { "recover", "-R", cacheDir });
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runProgram("hg", true, { "pull", "-R", cacheDir, "--", actualUrl });
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} else {
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throw ExecError(e.status, fmt("'hg pull' %s", statusToString(e.status)));
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}
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}
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} else {
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createDirs(dirOf(cacheDir));
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runProgram("hg", true, { "clone", "--noupdate", "--", actualUrl, cacheDir });
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}
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}
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auto tokens = tokenizeString<std::vector<std::string>>(
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runProgram("hg", true, { "log", "-R", cacheDir, "-r", revOrRef, "--template", "{node} {rev} {branch}" }));
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assert(tokens.size() == 3);
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input->rev = Hash(tokens[0], htSHA1);
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auto revCount = std::stoull(tokens[1]);
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input->ref = tokens[2];
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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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Path tmpDir = createTempDir();
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AutoDelete delTmpDir(tmpDir, true);
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runProgram("hg", true, { "archive", "-R", cacheDir, "-r", input->rev->gitRev(), tmpDir });
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deletePath(tmpDir + "/.hg_archival.txt");
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auto storePath = store->addToStore(name, tmpDir);
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Attrs infoAttrs({
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{"rev", input->rev->gitRev()},
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{"revCount", (int64_t) revCount},
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});
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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 MercurialInputScheme : 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 != "hg+http" &&
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url.scheme != "hg+https" &&
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url.scheme != "hg+ssh" &&
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url.scheme != "hg+file") return nullptr;
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auto url2(url);
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url2.scheme = std::string(url2.scheme, 3);
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url2.query.clear();
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Attrs attrs;
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attrs.emplace("type", "hg");
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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") != "hg") return {};
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for (auto & [name, value] : attrs)
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if (name != "type" && name != "url" && name != "ref" && name != "rev")
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throw Error("unsupported Mercurial input attribute '%s'", name);
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auto input = std::make_unique<MercurialInput>(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 Mercurial 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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return input;
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}
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};
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static auto r1 = OnStartup([] { registerInputScheme(std::make_unique<MercurialInputScheme>()); });
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}
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