Function tryStat

lib/protocol/SFTP.js:2265–2389

(err, attrs)

      tryStat(null, { size: fileSize });

    function tryStat(err, attrs) {
      if (err) {
        if (src !== fs) {
          // Try stat() for sftp servers that may not support fstat() for
          // whatever reason
          src.stat(srcPath, (err_, attrs_) => {
            if (err_)
              return onerror(err);
            tryStat(null, attrs_);
          });
          return;
        }
        return onerror(err);
      }
      fsize = attrs.size;

      dst.open(dstPath, 'w', (err, destHandle) => {
        if (err)
          return onerror(err);

        dstHandle = destHandle;

        if (fsize <= 0)
          return onerror();

        // Use less memory where possible
        while (bufsize > fsize) {
          if (concurrency === 1) {
            bufsize = fsize;
            break;
          }
          bufsize -= chunkSize;
          --concurrency;
        }

        readbuf = tryCreateBuffer(bufsize);
        if (readbuf instanceof Error)
          return onerror(readbuf);

        if (mode !== undefined) {
          dst.fchmod(dstHandle, mode, function tryAgain(err) {
            if (err) {
              // Try chmod() for sftp servers that may not support fchmod()
              // for whatever reason
              dst.chmod(dstPath, mode, (err_) => tryAgain());
              return;
            }
            startReads();
          });
        } else {
          startReads();
        }

        function onread(err, nb, data, dstpos, datapos, origChunkLen) {
          if (err)
            return onerror(err);

          datapos = datapos || 0;