Upgrade folly to v2020.02.17.00 (#809)

Summary:
# Summary

Folly became once again incompatible with the Android NDK, which caused our CI to fail to produce sample APK builds on release. I managed to repro this on my machine and it's working again now.

Sadly, I had to patch another file manually because something about the template parameter inference wasn't working ...

# Notes

This was done by first bumping the version, then going through the compiler errors and simply removing the lines that the C++ compiler in the NDK had trouble inferring the types for. We were lucky in that the exported symbols this affected weren't actually used, so I copied over the file to `overrides/Folly/` and set up another copy rule in Gradle.

# Meta

Pull Request resolved: https://github.com/facebook/flipper/pull/809

Test Plan:
```
./gradlew :sample:assembleDebug
```

Internal, external CI.

Reviewed By: mweststrate

Differential Revision: D19948797

Pulled By: passy

fbshipit-source-id: b2e98d3a5c89b0fc77c157683cde90997232fee0

android/third-party/overrides/Folly/FileUtil.cpp

@@ -0,0 +1,270 @@
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <folly/FileUtil.h>
+
+#include <cerrno>
+#include <string>
+#include <system_error>
+#include <vector>
+
+#include <folly/detail/FileUtilDetail.h>
+#include <folly/net/NetOps.h>
+#include <folly/portability/Fcntl.h>
+#include <folly/portability/Sockets.h>
+#include <folly/portability/Stdlib.h>
+#include <folly/portability/SysFile.h>
+#include <folly/portability/SysStat.h>
+
+namespace folly {
+
+using namespace fileutil_detail;
+
+static int filterCloseReturn(int r) {
+  // Ignore EINTR.  On Linux, close() may only return EINTR after the file
+  // descriptor has been closed, so you must not retry close() on EINTR --
+  // in the best case, you'll get EBADF, and in the worst case, you'll end up
+  // closing a different file (one opened from another thread).
+  //
+  // Interestingly enough, the Single Unix Specification says that the state
+  // of the file descriptor is unspecified if close returns EINTR.  In that
+  // case, the safe thing to do is also not to retry close() -- leaking a file
+  // descriptor is definitely better than closing the wrong file.
+  if (r == -1 && errno == EINTR) {
+    return 0;
+  }
+  return r;
+}
+
+int closeNoInt(int fd) {
+  return filterCloseReturn(close(fd));
+}
+
+int closeNoInt(NetworkSocket fd) {
+  return filterCloseReturn(netops::close(fd));
+}
+
+int fsyncNoInt(int fd) {
+  return int(wrapNoInt(fsync, fd));
+}
+
+int dupNoInt(int fd) {
+  return int(wrapNoInt(dup, fd));
+}
+
+int dup2NoInt(int oldfd, int newfd) {
+  return int(wrapNoInt(dup2, oldfd, newfd));
+}
+
+int fdatasyncNoInt(int fd) {
+#if defined(__APPLE__)
+  return int(wrapNoInt(fcntl, fd, F_FULLFSYNC));
+#elif defined(__FreeBSD__) || defined(_MSC_VER)
+  return int(wrapNoInt(fsync, fd));
+#else
+  return int(wrapNoInt(fdatasync, fd));
+#endif
+}
+
+int ftruncateNoInt(int fd, off_t len) {
+  return int(wrapNoInt(ftruncate, fd, len));
+}
+
+int truncateNoInt(const char* path, off_t len) {
+  return int(wrapNoInt(truncate, path, len));
+}
+
+int flockNoInt(int fd, int operation) {
+  return int(wrapNoInt(flock, fd, operation));
+}
+
+int shutdownNoInt(NetworkSocket fd, int how) {
+  return int(wrapNoInt(netops::shutdown, fd, how));
+}
+
+ssize_t readNoInt(int fd, void* buf, size_t count) {
+  return wrapNoInt(read, fd, buf, count);
+}
+
+ssize_t preadNoInt(int fd, void* buf, size_t count, off_t offset) {
+  return wrapNoInt(pread, fd, buf, count, offset);
+}
+
+ssize_t readvNoInt(int fd, const iovec* iov, int count) {
+  return wrapNoInt(readv, fd, iov, count);
+}
+
+ssize_t preadvNoInt(int fd, const iovec* iov, int count, off_t offset) {
+  return wrapNoInt(preadv, fd, iov, count, offset);
+}
+
+ssize_t writeNoInt(int fd, const void* buf, size_t count) {
+  return wrapNoInt(write, fd, buf, count);
+}
+
+ssize_t pwriteNoInt(int fd, const void* buf, size_t count, off_t offset) {
+  return wrapNoInt(pwrite, fd, buf, count, offset);
+}
+
+ssize_t writevNoInt(int fd, const iovec* iov, int count) {
+  return wrapNoInt(writev, fd, iov, count);
+}
+
+ssize_t pwritevNoInt(int fd, const iovec* iov, int count, off_t offset) {
+  return wrapNoInt(pwritev, fd, iov, count, offset);
+}
+
+ssize_t readFull(int fd, void* buf, size_t count) {
+  return wrapFull(read, fd, buf, count);
+}
+
+ssize_t preadFull(int fd, void* buf, size_t count, off_t offset) {
+  return wrapFull(pread, fd, buf, count, offset);
+}
+
+ssize_t writeFull(int fd, const void* buf, size_t count) {
+  return wrapFull(write, fd, const_cast<void*>(buf), count);
+}
+
+ssize_t pwriteFull(int fd, const void* buf, size_t count, off_t offset) {
+  return wrapFull(pwrite, fd, const_cast<void*>(buf), count, offset);
+}
+
+ssize_t readvFull(int fd, iovec* iov, int count) {
+  return wrapvFull(readv, fd, iov, count);
+}
+
+ssize_t preadvFull(int fd, iovec* iov, int count, off_t offset) {
+  return wrapvFull(preadv, fd, iov, count, offset);
+}
+
+ssize_t writevFull(int fd, iovec* iov, int count) {
+  return wrapvFull(writev, fd, iov, count);
+}
+
+ssize_t pwritevFull(int fd, iovec* iov, int count, off_t offset) {
+  return wrapvFull(pwritev, fd, iov, count, offset);
+}
+
+int writeFileAtomicNoThrow(
+    StringPiece filename,
+    iovec* iov,
+    int count,
+    mode_t permissions,
+    SyncType syncType) {
+  // We write the data to a temporary file name first, then atomically rename
+  // it into place.  This ensures that the file contents will always be valid,
+  // even if we crash or are killed partway through writing out data.
+  //
+  // Create a buffer that will contain two things:
+  // - A nul-terminated version of the filename
+  // - The temporary file name
+  std::vector<char> pathBuffer;
+  // Note that we have to explicitly pass in the size here to make
+  // sure the nul byte gets included in the data.
+  constexpr folly::StringPiece suffix(".XXXXXX\0", 8);
+  pathBuffer.resize((2 * filename.size()) + 1 + suffix.size());
+  // Copy in the filename and then a nul terminator
+  memcpy(pathBuffer.data(), filename.data(), filename.size());
+  pathBuffer[filename.size()] = '\0';
+  const char* const filenameCStr = pathBuffer.data();
+  // Now prepare the temporary path template
+  char* const tempPath = pathBuffer.data() + filename.size() + 1;
+  memcpy(tempPath, filename.data(), filename.size());
+  memcpy(tempPath + filename.size(), suffix.data(), suffix.size());
+
+  auto tmpFD = mkstemp(tempPath);
+  if (tmpFD == -1) {
+    return errno;
+  }
+  bool success = false;
+  SCOPE_EXIT {
+    if (tmpFD != -1) {
+      close(tmpFD);
+    }
+    if (!success) {
+      unlink(tempPath);
+    }
+  };
+
+  auto rc = writevFull(tmpFD, iov, count);
+  if (rc == -1) {
+    return errno;
+  }
+
+  rc = fchmod(tmpFD, permissions);
+  if (rc == -1) {
+    return errno;
+  }
+
+  // To guarantee atomicity across power failues on POSIX file systems,
+  // the temporary file must be explicitly sync'ed before the rename.
+  if (syncType == SyncType::WITH_SYNC) {
+    rc = fsyncNoInt(tmpFD);
+    if (rc == -1) {
+      return errno;
+    }
+  }
+
+  // Close the file before renaming to make sure all data has
+  // been successfully written.
+  rc = close(tmpFD);
+  tmpFD = -1;
+  if (rc == -1) {
+    return errno;
+  }
+
+  rc = rename(tempPath, filenameCStr);
+  if (rc == -1) {
+    return errno;
+  }
+  success = true;
+  return 0;
+}
+
+void writeFileAtomic(
+    StringPiece filename,
+    iovec* iov,
+    int count,
+    mode_t permissions,
+    SyncType syncType) {
+  auto rc = writeFileAtomicNoThrow(filename, iov, count, permissions, syncType);
+  if (rc != 0) {
+    auto msg = std::string(__func__) + "() failed to update " + filename.str();
+    throw std::system_error(rc, std::generic_category(), msg);
+  }
+}
+
+void writeFileAtomic(
+    StringPiece filename,
+    ByteRange data,
+    mode_t permissions,
+    SyncType syncType) {
+  iovec iov;
+  iov.iov_base = const_cast<unsigned char*>(data.data());
+  iov.iov_len = data.size();
+  writeFileAtomic(filename, &iov, 1, permissions, syncType);
+}
+
+void writeFileAtomic(
+    StringPiece filename,
+    StringPiece data,
+    mode_t permissions,
+    SyncType syncType) {
+  writeFileAtomic(filename, ByteRange(data), permissions, syncType);
+}
+
+} // namespace folly