diff options
Diffstat (limited to 'third_party/nix/src/libexpr/primops/fetchMercurial.cc')
| -rw-r--r-- | third_party/nix/src/libexpr/primops/fetchMercurial.cc | 219 |
1 files changed, 219 insertions, 0 deletions
diff --git a/third_party/nix/src/libexpr/primops/fetchMercurial.cc b/third_party/nix/src/libexpr/primops/fetchMercurial.cc new file mode 100644 index 0000000000..a907d0e1cd --- /dev/null +++ b/third_party/nix/src/libexpr/primops/fetchMercurial.cc @@ -0,0 +1,219 @@ +#include "primops.hh" +#include "eval-inline.hh" +#include "download.hh" +#include "store-api.hh" +#include "pathlocks.hh" + +#include <sys/time.h> + +#include <regex> + +#include <nlohmann/json.hpp> + +using namespace std::string_literals; + +namespace nix { + +struct HgInfo +{ + Path storePath; + std::string branch; + std::string rev; + uint64_t revCount = 0; +}; + +std::regex commitHashRegex("^[0-9a-fA-F]{40}$"); + +HgInfo exportMercurial(ref<Store> store, const std::string & uri, + std::string rev, const std::string & name) +{ + if (evalSettings.pureEval && rev == "") + throw Error("in pure evaluation mode, 'fetchMercurial' requires a Mercurial revision"); + + if (rev == "" && hasPrefix(uri, "/") && pathExists(uri + "/.hg")) { + + bool clean = runProgram("hg", true, { "status", "-R", uri, "--modified", "--added", "--removed" }) == ""; + + if (!clean) { + + /* This is an unclean working tree. So copy all tracked + files. */ + + printTalkative("copying unclean Mercurial working tree '%s'", uri); + + HgInfo hgInfo; + hgInfo.rev = "0000000000000000000000000000000000000000"; + hgInfo.branch = chomp(runProgram("hg", true, { "branch", "-R", uri })); + + auto files = tokenizeString<std::set<std::string>>( + runProgram("hg", true, { "status", "-R", uri, "--clean", "--modified", "--added", "--no-status", "--print0" }), "\0"s); + + PathFilter filter = [&](const Path & p) -> bool { + assert(hasPrefix(p, uri)); + std::string file(p, uri.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); + }; + + hgInfo.storePath = store->addToStore("source", uri, true, htSHA256, filter); + + return hgInfo; + } + } + + if (rev == "") rev = "default"; + + Path cacheDir = fmt("%s/nix/hg/%s", getCacheDir(), hashString(htSHA256, uri).to_string(Base32, false)); + + Path stampFile = fmt("%s/.hg/%s.stamp", cacheDir, hashString(htSHA512, rev).to_string(Base32, false)); + + /* If we haven't pulled this repo less than ‘tarball-ttl’ seconds, + do so now. */ + time_t now = time(0); + struct stat st; + if (stat(stampFile.c_str(), &st) != 0 || + (uint64_t) st.st_mtime + settings.tarballTtl <= (uint64_t) now) + { + /* Except that if this is a commit hash that we already have, + we don't have to pull again. */ + if (!(std::regex_match(rev, commitHashRegex) + && pathExists(cacheDir) + && runProgram( + RunOptions("hg", { "log", "-R", cacheDir, "-r", rev, "--template", "1" }) + .killStderr(true)).second == "1")) + { + Activity act(*logger, lvlTalkative, actUnknown, fmt("fetching Mercurial repository '%s'", uri)); + + if (pathExists(cacheDir)) { + try { + runProgram("hg", true, { "pull", "-R", cacheDir, "--", uri }); + } + 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, "--", uri }); + } else { + throw ExecError(e.status, fmt("'hg pull' %s", statusToString(e.status))); + } + } + } else { + createDirs(dirOf(cacheDir)); + runProgram("hg", true, { "clone", "--noupdate", "--", uri, cacheDir }); + } + } + + writeFile(stampFile, ""); + } + + auto tokens = tokenizeString<std::vector<std::string>>( + runProgram("hg", true, { "log", "-R", cacheDir, "-r", rev, "--template", "{node} {rev} {branch}" })); + assert(tokens.size() == 3); + + HgInfo hgInfo; + hgInfo.rev = tokens[0]; + hgInfo.revCount = std::stoull(tokens[1]); + hgInfo.branch = tokens[2]; + + std::string storeLinkName = hashString(htSHA512, name + std::string("\0"s) + hgInfo.rev).to_string(Base32, false); + Path storeLink = fmt("%s/.hg/%s.link", cacheDir, storeLinkName); + + try { + auto json = nlohmann::json::parse(readFile(storeLink)); + + assert(json["name"] == name && json["rev"] == hgInfo.rev); + + hgInfo.storePath = json["storePath"]; + + if (store->isValidPath(hgInfo.storePath)) { + printTalkative("using cached Mercurial store path '%s'", hgInfo.storePath); + return hgInfo; + } + + } catch (SysError & e) { + if (e.errNo != ENOENT) throw; + } + + Path tmpDir = createTempDir(); + AutoDelete delTmpDir(tmpDir, true); + + runProgram("hg", true, { "archive", "-R", cacheDir, "-r", rev, tmpDir }); + + deletePath(tmpDir + "/.hg_archival.txt"); + + hgInfo.storePath = store->addToStore(name, tmpDir); + + nlohmann::json json; + json["storePath"] = hgInfo.storePath; + json["uri"] = uri; + json["name"] = name; + json["branch"] = hgInfo.branch; + json["rev"] = hgInfo.rev; + json["revCount"] = hgInfo.revCount; + + writeFile(storeLink, json.dump()); + + return hgInfo; +} + +static void prim_fetchMercurial(EvalState & state, const Pos & pos, Value * * args, Value & v) +{ + std::string url; + std::string rev; + std::string name = "source"; + PathSet context; + + state.forceValue(*args[0]); + + if (args[0]->type == tAttrs) { + + state.forceAttrs(*args[0], pos); + + for (auto & attr : *args[0]->attrs) { + string n(attr.name); + if (n == "url") + url = state.coerceToString(*attr.pos, *attr.value, context, false, false); + else if (n == "rev") + rev = state.forceStringNoCtx(*attr.value, *attr.pos); + else if (n == "name") + name = state.forceStringNoCtx(*attr.value, *attr.pos); + else + throw EvalError("unsupported argument '%s' to 'fetchMercurial', at %s", attr.name, *attr.pos); + } + + if (url.empty()) + throw EvalError(format("'url' argument required, at %1%") % pos); + + } else + url = state.coerceToString(pos, *args[0], context, false, false); + + // FIXME: git externals probably can be used to bypass the URI + // whitelist. Ah well. + state.checkURI(url); + + auto hgInfo = exportMercurial(state.store, url, rev, name); + + state.mkAttrs(v, 8); + mkString(*state.allocAttr(v, state.sOutPath), hgInfo.storePath, PathSet({hgInfo.storePath})); + mkString(*state.allocAttr(v, state.symbols.create("branch")), hgInfo.branch); + mkString(*state.allocAttr(v, state.symbols.create("rev")), hgInfo.rev); + mkString(*state.allocAttr(v, state.symbols.create("shortRev")), std::string(hgInfo.rev, 0, 12)); + mkInt(*state.allocAttr(v, state.symbols.create("revCount")), hgInfo.revCount); + v.attrs->sort(); + + if (state.allowedPaths) + state.allowedPaths->insert(state.store->toRealPath(hgInfo.storePath)); +} + +static RegisterPrimOp r("fetchMercurial", 1, prim_fetchMercurial); + +} |