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https://github.com/NixOS/nix
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Backport libfetchers from the flakes branch
This provides a pluggable mechanism for defining new fetchers. It adds
a builtin function 'fetchTree' that generalizes existing fetchers like
'fetchGit', 'fetchMercurial' and 'fetchTarball'. 'fetchTree' takes a
set of attributes, e.g.
fetchTree {
type = "git";
url = "https://example.org/repo.git";
ref = "some-branch";
rev = "abcdef...";
}
The existing fetchers are just wrappers around this. Note that the
input attributes to fetchTree are the same as flake input
specifications and flake lock file entries.
All fetchers share a common cache stored in
~/.cache/nix/fetcher-cache-v1.sqlite. This replaces the ad hoc caching
mechanisms in fetchGit and download.cc (e.g. ~/.cache/nix/{tarballs,git-revs*}).
This also adds support for Git worktrees (c169ea5904).
This commit is contained in:
Eelco Dolstra
parent
ebb20a5356
commit
462421d345
36 changed files with 2199 additions and 647 deletions
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@ -1,174 +1,18 @@
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#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 "fetchers.hh"
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#include "url.hh"
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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::optional<Hash> rev;
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std::optional<std::string> ref;
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std::string name = "source";
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PathSet context;
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@ -182,8 +26,15 @@ static void prim_fetchMercurial(EvalState & state, const Pos & pos, Value * * ar
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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 == "rev") {
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// Ugly: unlike fetchGit, here the "rev" attribute can
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// be both a revision or a branch/tag name.
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auto value = state.forceStringNoCtx(*attr.value, *attr.pos);
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if (std::regex_match(value, revRegex))
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rev = Hash(value, htSHA1);
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else
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ref = value;
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}
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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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@ -200,18 +51,36 @@ static void prim_fetchMercurial(EvalState & state, const Pos & pos, Value * * ar
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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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if (evalSettings.pureEval && !rev)
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throw Error("in pure evaluation mode, 'fetchMercurial' requires a Mercurial revision");
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auto parsedUrl = parseURL(
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url.find("://") != std::string::npos
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? "hg+" + url
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: "hg+file://" + url);
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if (rev) parsedUrl.query.insert_or_assign("rev", rev->gitRev());
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if (ref) parsedUrl.query.insert_or_assign("ref", *ref);
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// FIXME: use name
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auto input = fetchers::inputFromURL(parsedUrl);
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auto [tree, input2] = input->fetchTree(state.store);
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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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auto storePath = state.store->printStorePath(tree.storePath);
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mkString(*state.allocAttr(v, state.sOutPath), storePath, PathSet({storePath}));
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if (input2->getRef())
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mkString(*state.allocAttr(v, state.symbols.create("branch")), *input2->getRef());
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// Backward compatibility: set 'rev' to
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// 0000000000000000000000000000000000000000 for a dirty tree.
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auto rev2 = input2->getRev().value_or(Hash(htSHA1));
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mkString(*state.allocAttr(v, state.symbols.create("rev")), rev2.gitRev());
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mkString(*state.allocAttr(v, state.symbols.create("shortRev")), std::string(rev2.gitRev(), 0, 12));
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if (tree.info.revCount)
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mkInt(*state.allocAttr(v, state.symbols.create("revCount")), *tree.info.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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state.allowedPaths->insert(tree.actualPath);
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}
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static RegisterPrimOp r("fetchMercurial", 1, prim_fetchMercurial);
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