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file.go
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file.go
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package io
import (
"fmt"
"io"
"os"
"path/filepath"
"go.uber.org/multierr"
)
// ReadFile reads the file from path, if not found, it will print the absolute path, instead of
// relative path.
func ReadFile(path string) ([]byte, error) {
absPath, err := filepath.Abs(path)
if err != nil {
return nil, fmt.Errorf("could not get absolution path: %w", err)
}
data, err := os.ReadFile(absPath)
if err != nil {
return nil, fmt.Errorf("could not read file: %w", err)
}
return data, nil
}
func FileExists(filename string) bool {
info, err := os.Stat(filename)
if os.IsNotExist(err) {
return false
}
return !info.IsDir()
}
// CopyDirectory recursively copies a directory.
// From https://stackoverflow.com/questions/51779243/copy-a-folder-in-go
func CopyDirectory(scrDir, dest string) error {
entries, err := os.ReadDir(scrDir)
if err != nil {
return err
}
for _, entry := range entries {
sourcePath := filepath.Join(scrDir, entry.Name())
destPath := filepath.Join(dest, entry.Name())
fileInfo, err := os.Stat(sourcePath)
if err != nil {
return err
}
switch fileInfo.Mode() & os.ModeType {
case os.ModeDir:
if err := CreateIfNotExists(destPath, 0755); err != nil {
return err
}
if err := CopyDirectory(sourcePath, destPath); err != nil {
return err
}
case os.ModeSymlink:
if err := CopySymLink(sourcePath, destPath); err != nil {
return err
}
default:
if err := Copy(sourcePath, destPath); err != nil {
return err
}
}
if err := chown(destPath, fileInfo); err != nil {
return err
}
fInfo, err := entry.Info()
if err != nil {
return err
}
isSymlink := fInfo.Mode()&os.ModeSymlink != 0
if !isSymlink {
if err := os.Chmod(destPath, fInfo.Mode()); err != nil {
return err
}
}
}
return nil
}
func Copy(srcFile, dstFile string) (errToReturn error) {
in, err := os.Open(srcFile)
if err != nil {
return fmt.Errorf("can not open file %v to copy from: %w", srcFile, err)
}
defer multierr.AppendInvoke(&errToReturn, multierr.Close(in))
out, err := os.Create(dstFile)
if err != nil {
return fmt.Errorf("can not create file %v to copy to: %w", dstFile, err)
}
defer multierr.AppendInvoke(&errToReturn, multierr.Close(out))
_, err = io.Copy(out, in)
if err != nil {
return fmt.Errorf("can not copy file: %w", err)
}
return nil
}
func Exists(filePath string) bool {
if _, err := os.Stat(filePath); os.IsNotExist(err) {
return false
}
return true
}
func CreateIfNotExists(dir string, perm os.FileMode) error {
if Exists(dir) {
return nil
}
if err := os.MkdirAll(dir, perm); err != nil {
return fmt.Errorf("failed to create directory: '%s', error: '%s'", dir, err.Error())
}
return nil
}
func CopySymLink(source, dest string) error {
link, err := os.Readlink(source)
if err != nil {
return err
}
return os.Symlink(link, dest)
}