github.com/chike0905/go-ethereum@v1.9.7/common/path.go (about)

     1  // Copyright 2014 The go-ethereum Authors
     2  // This file is part of the go-ethereum library.
     3  //
     4  // The go-ethereum library is free software: you can redistribute it and/or modify
     5  // it under the terms of the GNU Lesser General Public License as published by
     6  // the Free Software Foundation, either version 3 of the License, or
     7  // (at your option) any later version.
     8  //
     9  // The go-ethereum library is distributed in the hope that it will be useful,
    10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    12  // GNU Lesser General Public License for more details.
    13  //
    14  // You should have received a copy of the GNU Lesser General Public License
    15  // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
    16  
    17  package common
    18  
    19  import (
    20  	"fmt"
    21  	"os"
    22  	"path/filepath"
    23  	"runtime"
    24  )
    25  
    26  // MakeName creates a node name that follows the ethereum convention
    27  // for such names. It adds the operation system name and Go runtime version
    28  // the name.
    29  func MakeName(name, version string) string {
    30  	return fmt.Sprintf("%s/v%s/%s/%s", name, version, runtime.GOOS, runtime.Version())
    31  }
    32  
    33  // FileExist checks if a file exists at filePath.
    34  func FileExist(filePath string) bool {
    35  	_, err := os.Stat(filePath)
    36  	if err != nil && os.IsNotExist(err) {
    37  		return false
    38  	}
    39  
    40  	return true
    41  }
    42  
    43  // AbsolutePath returns datadir + filename, or filename if it is absolute.
    44  func AbsolutePath(datadir string, filename string) string {
    45  	if filepath.IsAbs(filename) {
    46  		return filename
    47  	}
    48  	return filepath.Join(datadir, filename)
    49  }