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// Copyright (C) 2019-2024 Algorand, Inc.
// This file is part of go-algorand
//
// go-algorand is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// go-algorand is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with go-algorand. If not, see <https://www.gnu.org/licenses/>.
package util
import (
"fmt"
"io"
"os"
"path/filepath"
"strings"
)
// CopyFile uses io.Copy() to copy a file to another location
// This was copied from https://opensource.com/article/18/6/copying-files-go
func CopyFile(src, dst string) (int64, error) {
sourceFileStat, err := os.Stat(src)
if err != nil {
return 0, err
}
if !sourceFileStat.Mode().IsRegular() {
return 0, fmt.Errorf("%s is not a regular file", src)
}
source, err := os.Open(src)
if err != nil {
return 0, err
}
defer source.Close()
destination, err := os.Create(dst)
if err != nil {
return 0, err
}
defer destination.Close()
nBytes, err := io.Copy(destination, source)
return nBytes, err
}
// FileExists checks to see if the specified file (or directory) exists
func FileExists(filePath string) bool {
_, err := os.Stat(filePath)
fileExists := err == nil
return fileExists
}
// IsEmpty recursively check path for files and returns true if there are none.
func IsEmpty(path string) bool {
err := filepath.Walk(path, func(path string, info os.FileInfo, err error) error {
if info.IsDir() {
return nil
}
return os.ErrExist
})
return err == nil
}
// ExeDir returns the absolute path to the current executing binary (not including the filename)
func ExeDir() (string, error) {
ex, err := os.Executable()
if err != nil {
return "", err
}
baseDir := filepath.Dir(ex)
binDir, err := filepath.Abs(baseDir)
return binDir, err
}
// GetFirstLineFromFile retrieves the first line of the specified file.
func GetFirstLineFromFile(netFile string) (string, error) {
addrStr, err := os.ReadFile(netFile)
if err != nil {
return "", err
}
// We only want the first line, so split at newlines and take the first
lines := strings.Split(string(addrStr), "\n")
return lines[0], err
}
// IsDir returns true if the specified directory is valid
func IsDir(path string) bool {
fi, err := os.Stat(path)
return err == nil && fi.IsDir()
}
// IncludeFilter is a callback for filtering files and folders encountered while copying with CopyFileWithFilter()
type IncludeFilter func(name string, info os.FileInfo) bool
// CopyFolderWithFilter recursively copies an entire directory to another location (ignoring symlinks)
// with an optional filter function to include/exclude folders or files
func CopyFolderWithFilter(source, dest string, includeFilter IncludeFilter) (err error) {
if !IsDir(source) {
return fmt.Errorf("%s is not a folder - unable to copy", source)
}
info, err := os.Stat(source)
if err != nil {
return fmt.Errorf("error getting status for '%s': %v", source, err)
}
if info.Mode()&os.ModeSymlink != 0 {
return fmt.Errorf("symlink are not supported")
}
return copyFolder(source, dest, info, includeFilter)
}
// CopyFolder recursively copies an entire directory to another location (ignoring symlinks)
func CopyFolder(source, dest string) error {
return CopyFolderWithFilter(source, dest, nil)
}
func copyFolder(source string, dest string, info os.FileInfo, includeFilter IncludeFilter) (err error) {
if err := os.MkdirAll(dest, info.Mode()); err != nil {
return fmt.Errorf("error creating destination folder: %v", err)
}
contents, err := os.ReadDir(source)
if err != nil {
return err
}
for _, content := range contents {
name := content.Name()
sourceName := filepath.Join(source, name)
sourceInfo, statErr := os.Stat(sourceName)
if statErr != nil {
return statErr
}
// Skip symlinks
if sourceInfo.Mode()&os.ModeSymlink != 0 {
continue
}
// If filter provided, see if it wants to include
if includeFilter != nil && !includeFilter(sourceName, sourceInfo) {
continue
}
destName := filepath.Join(dest, name)
if sourceInfo.IsDir() {
err = copyFolder(sourceName, destName, sourceInfo, includeFilter)
} else {
_, err = CopyFile(sourceName, destName)
}
if err != nil {
return
}
}
return
}
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