chore(3p/nix): unvendor tvix 0.1 r/4098

Nothing is using this now, and we'll likely never pick this up again,
but we learned a lot in the process.

Every now and then this breaks in some bizarre way on channel bumps
and it's just a waste of time to maintain that.

Change-Id: Idcf2f5acd4ca7070ce18d7149cbfc0d967dc0a44
Reviewed-on: https://cl.tvl.fyi/c/depot/+/5632
Tested-by: BuildkiteCI
Reviewed-by: sterni <sternenseemann@systemli.org>
Reviewed-by: lukegb <lukegb@tvl.fyi>
Autosubmit: tazjin <tazjin@tvl.su>

1 files changed, 0 insertions, 398 deletions

diff --git a/third_party/nix/src/libutil/archive.cc b/third_party/nix/src/libutil/archive.cc
deleted file mode 100644
index e470ad7be6ce..000000000000
--- a/third_party/nix/src/libutil/archive.cc
+++ /dev/null
@@ -1,398 +0,0 @@
-#include "libutil/archive.hh"
-
-#include <algorithm>
-#include <cerrno>
-#include <map>
-#include <vector>
-
-#include <dirent.h>
-#include <fcntl.h>
-#include <glog/logging.h>
-#include <strings.h>  // for strcasecmp
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <unistd.h>
-
-#include "libutil/config.hh"
-#include "libutil/util.hh"
-
-namespace nix {
-
-struct ArchiveSettings : Config {
-  Setting<bool> useCaseHack {
-    this,
-#if __APPLE__
-        true,
-#else
-        false,
-#endif
-        "use-case-hack",
-        "Whether to enable a Darwin-specific hack for dealing with file name "
-        "collisions."
-  };
-};
-
-static ArchiveSettings archiveSettings;
-
-static GlobalConfig::Register r1(&archiveSettings);
-
-constexpr std::string_view kCaseHackSuffix = "~nix~case~hack~";
-
-PathFilter defaultPathFilter = [](const Path& /*unused*/) { return true; };
-
-static void dumpContents(const Path& path, size_t size, Sink& sink) {
-  sink << "contents" << size;
-
-  AutoCloseFD fd(open(path.c_str(), O_RDONLY | O_CLOEXEC));
-  if (!fd) {
-    throw SysError(format("opening file '%1%'") % path);
-  }
-
-  std::vector<unsigned char> buf(65536);
-  size_t left = size;
-
-  while (left > 0) {
-    auto n = std::min(left, buf.size());
-    readFull(fd.get(), buf.data(), n);
-    left -= n;
-    sink(buf.data(), n);
-  }
-
-  writePadding(size, sink);
-}
-
-static void dump(const Path& path, Sink& sink, PathFilter& filter) {
-  checkInterrupt();
-
-  struct stat st;
-  if (lstat(path.c_str(), &st) != 0) {
-    throw SysError(format("getting attributes of path '%1%'") % path);
-  }
-
-  sink << "(";
-
-  if (S_ISREG(st.st_mode)) {
-    sink << "type"
-         << "regular";
-    if ((st.st_mode & S_IXUSR) != 0u) {
-      sink << "executable"
-           << "";
-    }
-    dumpContents(path, static_cast<size_t>(st.st_size), sink);
-  }
-
-  else if (S_ISDIR(st.st_mode)) {
-    sink << "type"
-         << "directory";
-
-    /* If we're on a case-insensitive system like macOS, undo
-       the case hack applied by restorePath(). */
-    std::map<std::string, std::string> unhacked;
-    for (auto& i : readDirectory(path)) {
-      if (archiveSettings.useCaseHack) {
-        std::string name(i.name);
-        size_t pos = i.name.find(kCaseHackSuffix);
-        if (pos != std::string::npos) {
-          DLOG(INFO) << "removing case hack suffix from " << path << "/"
-                     << i.name;
-
-          name.erase(pos);
-        }
-        if (unhacked.find(name) != unhacked.end()) {
-          throw Error(format("file name collision in between '%1%' and '%2%'") %
-                      (path + "/" + unhacked[name]) % (path + "/" + i.name));
-        }
-        unhacked[name] = i.name;
-      } else {
-        unhacked[i.name] = i.name;
-      }
-    }
-
-    for (auto& i : unhacked) {
-      if (filter(path + "/" + i.first)) {
-        sink << "entry"
-             << "("
-             << "name" << i.first << "node";
-        dump(path + "/" + i.second, sink, filter);
-        sink << ")";
-      }
-    }
-  }
-
-  else if (S_ISLNK(st.st_mode)) {
-    sink << "type"
-         << "symlink"
-         << "target" << readLink(path);
-
-  } else {
-    throw Error(format("file '%1%' has an unsupported type") % path);
-  }
-
-  sink << ")";
-}
-
-void dumpPath(const Path& path, Sink& sink, PathFilter& filter) {
-  sink << std::string(kNarVersionMagic1);
-  dump(path, sink, filter);
-}
-
-void dumpString(const std::string& s, Sink& sink) {
-  sink << std::string(kNarVersionMagic1) << "("
-       << "type"
-       << "regular"
-       << "contents" << s << ")";
-}
-
-static SerialisationError badArchive(const std::string& s) {
-  return SerialisationError("bad archive: " + s);
-}
-
-#if 0
-static void skipGeneric(Source & source)
-{
-    if (readString(source) == "(") {
-        while (readString(source) != ")")
-            skipGeneric(source);
-    }
-}
-#endif
-
-static void parseContents(ParseSink& sink, Source& source, const Path& path) {
-  unsigned long long size = readLongLong(source);
-
-  sink.preallocateContents(size);
-
-  unsigned long long left = size;
-  std::vector<unsigned char> buf(65536);
-
-  while (left != 0u) {
-    checkInterrupt();
-    auto n = buf.size();
-    if (static_cast<unsigned long long>(n) > left) {
-      n = left;
-    }
-    source(buf.data(), n);
-    sink.receiveContents(buf.data(), n);
-    left -= n;
-  }
-
-  readPadding(size, source);
-}
-
-struct CaseInsensitiveCompare {
-  bool operator()(const std::string& a, const std::string& b) const {
-    return strcasecmp(a.c_str(), b.c_str()) < 0;
-  }
-};
-
-static void parse(ParseSink& sink, Source& source, const Path& path) {
-  std::string s;
-
-  s = readString(source);
-  if (s != "(") {
-    throw badArchive("expected open tag");
-  }
-
-  enum { tpUnknown, tpRegular, tpDirectory, tpSymlink } type = tpUnknown;
-
-  std::map<Path, int, CaseInsensitiveCompare> names;
-
-  while (true) {
-    checkInterrupt();
-
-    s = readString(source);
-
-    if (s == ")") {
-      break;
-    }
-
-    if (s == "type") {
-      if (type != tpUnknown) {
-        throw badArchive("multiple type fields");
-      }
-      std::string t = readString(source);
-
-      if (t == "regular") {
-        type = tpRegular;
-        sink.createRegularFile(path);
-      }
-
-      else if (t == "directory") {
-        sink.createDirectory(path);
-        type = tpDirectory;
-      }
-
-      else if (t == "symlink") {
-        type = tpSymlink;
-      }
-
-      else {
-        throw badArchive("unknown file type " + t);
-      }
-
-    }
-
-    else if (s == "contents" && type == tpRegular) {
-      parseContents(sink, source, path);
-    }
-
-    else if (s == "executable" && type == tpRegular) {
-      auto s = readString(source);
-      if (!s.empty()) {
-        throw badArchive("executable marker has non-empty value");
-      }
-      sink.isExecutable();
-    }
-
-    else if (s == "entry" && type == tpDirectory) {
-      std::string name;
-      std::string prevName;
-
-      s = readString(source);
-      if (s != "(") {
-        throw badArchive("expected open tag");
-      }
-
-      while (true) {
-        checkInterrupt();
-
-        s = readString(source);
-
-        if (s == ")") {
-          break;
-        }
-        if (s == "name") {
-          name = readString(source);
-          if (name.empty() || name == "." || name == ".." ||
-              name.find('/') != std::string::npos ||
-              name.find(static_cast<char>(0)) != std::string::npos) {
-            throw Error(format("NAR contains invalid file name '%1%'") % name);
-          }
-          if (name <= prevName) {
-            throw Error("NAR directory is not sorted");
-          }
-          prevName = name;
-          if (archiveSettings.useCaseHack) {
-            auto i = names.find(name);
-            if (i != names.end()) {
-              DLOG(INFO) << "case collision between '" << i->first << "' and '"
-                         << name << "'";
-              name += kCaseHackSuffix;
-              name += std::to_string(++i->second);
-            } else {
-              names[name] = 0;
-            }
-          }
-        } else if (s == "node") {
-          if (s.empty()) {
-            throw badArchive("entry name missing");
-          }
-          parse(sink, source, path + "/" + name);
-        } else {
-          throw badArchive("unknown field " + s);
-        }
-      }
-    }
-
-    else if (s == "target" && type == tpSymlink) {
-      std::string target = readString(source);
-      sink.createSymlink(path, target);
-    }
-
-    else {
-      throw badArchive("unknown field " + s);
-    }
-  }
-}
-
-void parseDump(ParseSink& sink, Source& source) {
-  std::string version;
-  try {
-    version = readString(source, kNarVersionMagic1.size());
-  } catch (SerialisationError& e) {
-    /* This generally means the integer at the start couldn't be
-       decoded.  Ignore and throw the exception below. */
-  }
-  if (version != kNarVersionMagic1) {
-    throw badArchive("input doesn't look like a Nix archive");
-  }
-  parse(sink, source, "");
-}
-
-struct RestoreSink : ParseSink {
-  Path dstPath;
-  AutoCloseFD fd;
-
-  void createDirectory(const Path& path) override {
-    Path p = dstPath + path;
-    if (mkdir(p.c_str(), 0777) == -1) {
-      throw SysError(format("creating directory '%1%'") % p);
-    }
-  };
-
-  void createRegularFile(const Path& path) override {
-    Path p = dstPath + path;
-    fd = AutoCloseFD(
-        open(p.c_str(), O_CREAT | O_EXCL | O_WRONLY | O_CLOEXEC, 0666));
-    if (!fd) {
-      throw SysError(format("creating file '%1%'") % p);
-    }
-  }
-
-  void isExecutable() override {
-    struct stat st;
-    if (fstat(fd.get(), &st) == -1) {
-      throw SysError("fstat");
-    }
-    if (fchmod(fd.get(), st.st_mode | (S_IXUSR | S_IXGRP | S_IXOTH)) == -1) {
-      throw SysError("fchmod");
-    }
-  }
-
-  void preallocateContents(unsigned long long len) override {
-#if HAVE_POSIX_FALLOCATE
-    if (len != 0u) {
-      errno = posix_fallocate(fd.get(), 0, len);
-      /* Note that EINVAL may indicate that the underlying
-         filesystem doesn't support preallocation (e.g. on
-         OpenSolaris).  Since preallocation is just an
-         optimisation, ignore it. */
-      if (errno && errno != EINVAL && errno != EOPNOTSUPP && errno != ENOSYS) {
-        throw SysError(format("preallocating file of %1% bytes") % len);
-      }
-    }
-#endif
-  }
-
-  void receiveContents(unsigned char* data, unsigned int len) override {
-    writeFull(fd.get(), data, len);
-  }
-
-  void createSymlink(const Path& path, const std::string& target) override {
-    Path p = dstPath + path;
-    nix::createSymlink(target, p);
-  }
-};
-
-void restorePath(const Path& path, Source& source) {
-  RestoreSink sink;
-  sink.dstPath = path;
-  parseDump(sink, source);
-}
-
-void copyNAR(Source& source, Sink& sink) {
-  // FIXME: if 'source' is the output of dumpPath() followed by EOF,
-  // we should just forward all data directly without parsing.
-
-  ParseSink parseSink; /* null sink; just parse the NAR */
-
-  LambdaSource wrapper([&](unsigned char* data, size_t len) {
-    auto n = source.read(data, len);
-    sink(data, n);
-    return n;
-  });
-
-  parseDump(parseSink, wrapper);
-}
-
-}  // namespace nix