github.com/aigarnetwork/aigar@v0.0.0-20191115204914-d59a6eb70f8e/common/path.go (about)

     1  //  Copyright 2018 The go-ethereum Authors
     2  //  Copyright 2019 The go-aigar Authors
     3  //  This file is part of the go-aigar library.
     4  //
     5  //  The go-aigar library is free software: you can redistribute it and/or modify
     6  //  it under the terms of the GNU Lesser General Public License as published by
     7  //  the Free Software Foundation, either version 3 of the License, or
     8  //  (at your option) any later version.
     9  //
    10  //  The go-aigar library is distributed in the hope that it will be useful,
    11  //  but WITHOUT ANY WARRANTY; without even the implied warranty of
    12  //  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    13  //  GNU Lesser General Public License for more details.
    14  //
    15  //  You should have received a copy of the GNU Lesser General Public License
    16  //  along with the go-aigar library. If not, see <http://www.gnu.org/licenses/>.
    17  
    18  package common
    19  
    20  import (
    21  	"fmt"
    22  	"os"
    23  	"path/filepath"
    24  	"runtime"
    25  )
    26  
    27  // MakeName creates a node name that follows the ethereum convention
    28  // for such names. It adds the operation system name and Go runtime version
    29  // the name.
    30  func MakeName(name, version string) string {
    31  	return fmt.Sprintf("%s/v%s/%s/%s", name, version, runtime.GOOS, runtime.Version())
    32  }
    33  
    34  // FileExist checks if a file exists at filePath.
    35  func FileExist(filePath string) bool {
    36  	_, err := os.Stat(filePath)
    37  	if err != nil && os.IsNotExist(err) {
    38  		return false
    39  	}
    40  
    41  	return true
    42  }
    43  
    44  // AbsolutePath returns datadir + filename, or filename if it is absolute.
    45  func AbsolutePath(datadir string, filename string) string {
    46  	if filepath.IsAbs(filename) {
    47  		return filename
    48  	}
    49  	return filepath.Join(datadir, filename)
    50  }