YugabyteDB (2.13.0.0-b42, bfc6a6643e7399ac8a0e81d06a3ee6d6571b33ab)

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//   http://www.apache.org/licenses/LICENSE-2.0

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// under the License.

//

// The following only applies to changes made to this file as part of YugaByte development.

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// Portions Copyright (c) YugaByte, Inc.

//

// 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

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// Unless required by applicable law or agreed to in writing, software distributed under the License

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// or implied.  See the License for the specific language governing permissions and limitations

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#include "yb/util/user.h"

#include <pwd.h>

#include <boost/algorithm/string/trim.hpp>

#include "yb/util/errno.h"

#include "yb/util/malloc.h"

#include "yb/util/result.h"

#include "yb/util/subprocess.h"

using std::string;

namespace yb {

namespace {

Result<std::string> DoGetLoggedInUser() {

  std::string result;

  RETURN_NOT_OK(Subprocess::Call({"whoami"}, &result));

  boost::trim(result);

  return result;

}

Result<std::string> GetLoggedInUserFallback() {

  static auto result = DoGetLoggedInUser();

  return result;

}

} // namespace

Result<std::string> GetLoggedInUser() {

  auto bufsize = sysconf(_SC_GETPW_R_SIZE_MAX);

  if (bufsize == -1) {  // Value was indeterminate.

    bufsize = 16384;    // Should be more than enough, per the man page.

  }

  std::unique_ptr<char[], FreeDeleter> buf(static_cast<char*>(malloc(bufsize)));

  if (buf.get() == nullptr) {

    return STATUS(RuntimeError, "Malloc failed", Errno(errno));

  }

  struct passwd pwd;

  struct passwd *result;

  auto uid = getuid();

  int ret = getpwuid_r(uid, &pwd, buf.get(), bufsize, &result);

  if (result == nullptr) {

    if (ret == 0) {

      return GetLoggedInUserFallback();

    } else {

      // Errno in ret

      return STATUS(RuntimeError, "Error calling getpwuid_r()", Errno(ret));

    }

  }

  return pwd.pw_name;

}

} // namespace yb