220 lines
7.3 KiB
C++
220 lines
7.3 KiB
C++
#include "primops.hh"
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#include "eval-inline.hh"
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#include "download.hh"
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#include "store-api.hh"
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#include "pathlocks.hh"
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#include <sys/time.h>
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#include <regex>
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#include <nlohmann/json.hpp>
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using namespace std::string_literals;
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namespace nix {
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struct HgInfo
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{
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Path storePath;
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std::string branch;
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std::string rev;
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uint64_t revCount = 0;
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};
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std::regex commitHashRegex("^[0-9a-fA-F]{40}$");
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HgInfo exportMercurial(ref<Store> store, const std::string & uri,
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std::string rev, const std::string & name)
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{
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if (evalSettings.pureEval && rev == "")
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throw Error("in pure evaluation mode, 'fetchMercurial' requires a Mercurial revision");
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if (rev == "" && hasPrefix(uri, "/") && pathExists(uri + "/.hg")) {
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bool clean = runProgram("hg", true, { "status", "-R", uri, "--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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printTalkative("copying unclean Mercurial working tree '%s'", uri);
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HgInfo hgInfo;
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hgInfo.rev = "0000000000000000000000000000000000000000";
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hgInfo.branch = chomp(runProgram("hg", true, { "branch", "-R", uri }));
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auto files = tokenizeString<std::set<std::string>>(
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runProgram("hg", true, { "status", "-R", uri, "--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, uri));
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std::string file(p, uri.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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hgInfo.storePath = store->printStorePath(store->addToStore("source", uri, true, htSHA256, filter));
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return hgInfo;
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}
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}
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if (rev == "") rev = "default";
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Path cacheDir = fmt("%s/nix/hg/%s", getCacheDir(), hashString(htSHA256, uri).to_string(Base32, false));
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Path stampFile = fmt("%s/.hg/%s.stamp", cacheDir, hashString(htSHA512, rev).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 (!(std::regex_match(rev, commitHashRegex)
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&& pathExists(cacheDir)
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&& runProgram(
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RunOptions("hg", { "log", "-R", cacheDir, "-r", rev, "--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'", uri));
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if (pathExists(cacheDir)) {
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try {
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runProgram("hg", true, { "pull", "-R", cacheDir, "--", uri });
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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, "--", uri });
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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", "--", uri, 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", rev, "--template", "{node} {rev} {branch}" }));
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assert(tokens.size() == 3);
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HgInfo hgInfo;
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hgInfo.rev = tokens[0];
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hgInfo.revCount = std::stoull(tokens[1]);
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hgInfo.branch = tokens[2];
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std::string storeLinkName = hashString(htSHA512, name + std::string("\0"s) + hgInfo.rev).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"] == hgInfo.rev);
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hgInfo.storePath = json["storePath"];
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if (store->isValidPath(store->parseStorePath(hgInfo.storePath))) {
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printTalkative("using cached Mercurial store path '%s'", hgInfo.storePath);
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return hgInfo;
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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", rev, tmpDir });
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deletePath(tmpDir + "/.hg_archival.txt");
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hgInfo.storePath = store->printStorePath(store->addToStore(name, tmpDir));
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nlohmann::json json;
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json["storePath"] = hgInfo.storePath;
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json["uri"] = uri;
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json["name"] = name;
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json["branch"] = hgInfo.branch;
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json["rev"] = hgInfo.rev;
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json["revCount"] = hgInfo.revCount;
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writeFile(storeLink, json.dump());
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return hgInfo;
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}
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static void prim_fetchMercurial(EvalState & state, const Pos & pos, Value * * args, Value & v)
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{
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std::string url;
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std::string rev;
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std::string name = "source";
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PathSet context;
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state.forceValue(*args[0]);
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if (args[0]->type == tAttrs) {
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state.forceAttrs(*args[0], pos);
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for (auto & attr : *args[0]->attrs) {
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string n(attr.name);
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if (n == "url")
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url = state.coerceToString(*attr.pos, *attr.value, context, false, false);
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else if (n == "rev")
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rev = state.forceStringNoCtx(*attr.value, *attr.pos);
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else if (n == "name")
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name = state.forceStringNoCtx(*attr.value, *attr.pos);
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else
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throw EvalError("unsupported argument '%s' to 'fetchMercurial', at %s", attr.name, *attr.pos);
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}
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if (url.empty())
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throw EvalError(format("'url' argument required, at %1%") % pos);
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} else
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url = state.coerceToString(pos, *args[0], context, false, false);
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// FIXME: git externals probably can be used to bypass the URI
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// whitelist. Ah well.
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state.checkURI(url);
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auto hgInfo = exportMercurial(state.store, url, rev, name);
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state.mkAttrs(v, 8);
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mkString(*state.allocAttr(v, state.sOutPath), hgInfo.storePath, PathSet({hgInfo.storePath}));
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mkString(*state.allocAttr(v, state.symbols.create("branch")), hgInfo.branch);
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mkString(*state.allocAttr(v, state.symbols.create("rev")), hgInfo.rev);
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mkString(*state.allocAttr(v, state.symbols.create("shortRev")), std::string(hgInfo.rev, 0, 12));
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mkInt(*state.allocAttr(v, state.symbols.create("revCount")), hgInfo.revCount);
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v.attrs->sort();
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if (state.allowedPaths)
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state.allowedPaths->insert(state.store->toRealPath(hgInfo.storePath));
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}
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static RegisterPrimOp r("fetchMercurial", 1, prim_fetchMercurial);
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}
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