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https://github.com/NixOS/nix
synced 2025-07-06 05:01:48 +02:00
Convert fetchMercurial to a input type
This enables Mercurial flakes. It also fixes a bug in pure mode where you could use a branch/tag name rather than a revision.
This commit is contained in:
Eelco Dolstra
parent
9f4d8c6170
commit
b33b94748c
3 changed files with 313 additions and 173 deletions
274
src/libstore/fetchers/mercurial.cc
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274
src/libstore/fetchers/mercurial.cc
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#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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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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type = "hg";
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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 MercurialInput *>(&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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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 == "hg+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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bool isLocal = url.scheme == "hg+file";
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return {isLocal, isLocal ? url.path : std::string(url.base, 3)};
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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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// FIXME: return lastModified.
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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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Path cacheDir = fmt("%s/nix/hg/%s", getCacheDir(), hashString(htSHA256, actualUrl).to_string(Base32, false));
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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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Path stampFile = fmt("%s/.hg/%s.stamp", cacheDir, hashString(htSHA512, revOrRef).to_string(Base32, false));
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/* If we haven't pulled this repo less than ‘tarball-ttl’ seconds,
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do so now. */
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time_t now = time(0);
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struct stat st;
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if (stat(stampFile.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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/* Except that if this is a commit hash that we already have,
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we don't 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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writeFile(stampFile, "");
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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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std::string storeLinkName = hashString(htSHA512, name + std::string("\0"s) + input->rev->gitRev()).to_string(Base32, false);
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Path storeLink = fmt("%s/.hg/%s.link", cacheDir, storeLinkName);
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try {
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auto json = nlohmann::json::parse(readFile(storeLink));
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assert(json["name"] == name && json["rev"] == input->rev->gitRev());
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auto storePath = store->parseStorePath((std::string) json["storePath"]);
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if (store->isValidPath(storePath)) {
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printTalkative("using cached Mercurial store path '%s'", store->printStorePath(storePath));
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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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.rev = input->rev,
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.revCount = revCount,
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}, input};
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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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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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nlohmann::json json;
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json["storePath"] = store->printStorePath(storePath);
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json["uri"] = actualUrl;
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json["name"] = name;
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json["branch"] = *input->ref;
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json["rev"] = input->rev->gitRev();
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json["revCount"] = revCount;
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writeFile(storeLink, json.dump());
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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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.rev = input->rev,
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.revCount = revCount,
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}, input};
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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 input = std::make_unique<MercurialInput>(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("Mercurial 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("Mercurial 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<MercurialInputScheme>()); });
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}
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