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fs_util.go
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/
fs_util.go
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package libmangal
import (
"github.com/spf13/afero"
"io"
"path/filepath"
)
// mergeDirectories merges two directories recursively from different filesystems.
// If a file exists in both directories it will be overwritten.
func mergeDirectories(
dstFS afero.Fs, dstDir string,
srcFS afero.Fs, srcDir string,
) error {
srcFiles, err := afero.ReadDir(srcFS, srcDir)
if err != nil {
return err
}
for _, srcFile := range srcFiles {
srcFilePath := filepath.Join(srcDir, srcFile.Name())
dstFilePath := filepath.Join(dstDir, srcFile.Name())
if srcFile.IsDir() {
if err := mergeDirectories(
dstFS, dstFilePath,
srcFS, srcFilePath,
); err != nil {
return err
}
continue
}
exists, err := afero.Exists(dstFS, dstFilePath)
if err != nil {
return err
}
if exists {
if err := dstFS.Remove(dstFilePath); err != nil {
return err
}
} else {
if err := dstFS.MkdirAll(filepath.Dir(dstFilePath), modeDir); err != nil {
return err
}
}
srcFile, err := srcFS.Open(srcFilePath)
if err != nil {
return err
}
dstFile, err := dstFS.Create(dstFilePath)
if err != nil {
return err
}
if _, err := io.Copy(dstFile, srcFile); err != nil {
return err
}
_ = srcFile.Close()
_ = dstFile.Close()
}
return nil
}