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copy.go
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copy.go
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// Copyright (c) 2018 John Dewey
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
package repository
import (
"fmt"
"io"
"log/slog"
"os"
"path/filepath"
"github.com/spf13/afero"
)
// NewCopy factory to create a new copy instance.
func NewCopy(
appFs afero.Fs,
logger *slog.Logger,
) *Copy {
return &Copy{
appFs: appFs,
logger: logger,
}
}
// CopyFile copies the contents of the file named src to the file named
// by dst. The file will be created if it does not already exist. If the
// destination file exists, all it's contents will be replaced by the contents
// of the source file. The file mode will be copied from the source and
// the copied data is synced/flushed to stable storage.
func (r *Copy) CopyFile(
src string,
dst string,
) (err error) {
baseSrc := filepath.Base(src)
r.logger.Info(
"copying file",
slog.String("srcFile", baseSrc),
slog.String("dstFile", dst),
)
// Open the source file for reading, and record its metadata
in, err := r.appFs.Open(src)
if err != nil {
return err
}
defer func() { _ = in.Close() }()
si, err := r.appFs.Stat(src)
if err != nil {
return err
}
// Open dest file for writing; make it owner-only perms before putting
// anything in it
out, err := r.appFs.Create(dst)
if err != nil {
return err
}
defer func() { _ = out.Close() }()
err = r.appFs.Chmod(dst, 0o600)
if err != nil {
return err
}
_, err = io.Copy(out, in)
if err != nil {
return err
}
err = out.Sync()
if err != nil {
return err
}
// All done; make the permissions match
err = r.appFs.Chmod(dst, si.Mode())
if err != nil {
return err
}
return nil
}
// CopyDir recursively copies a directory tree, attempting to preserve permissions.
// Source directory must exist, destination directory must *not* exist.
// Symlinks are implicitly dereferenced.
func (r *Copy) CopyDir(
src string,
dst string,
) (err error) {
src = filepath.Clean(src)
dst = filepath.Clean(dst)
baseSrc := filepath.Base(src)
r.logger.Info(
"copying dir",
slog.String("srcDir", baseSrc),
slog.String("dstDir", dst),
)
si, err := r.appFs.Stat(src)
if err != nil {
return err
}
if !si.IsDir() {
return fmt.Errorf("source is not a directory")
}
_, err = r.appFs.Stat(dst)
if err != nil && !os.IsNotExist(err) {
return err
}
if err == nil {
return fmt.Errorf("destination already exists")
}
err = r.appFs.MkdirAll(dst, si.Mode())
if err != nil {
return err
}
entries, err := afero.ReadDir(r.appFs, src)
if err != nil {
return err
}
for _, entry := range entries {
srcPath := filepath.Join(src, entry.Name())
dstPath := filepath.Join(dst, entry.Name())
// Dereference any symlinks and copy their contents instead
entry, err = r.appFs.Stat(srcPath)
if err != nil {
return err
}
if entry.IsDir() {
err = r.CopyDir(srcPath, dstPath)
if err != nil {
return err
}
} else {
err = r.CopyFile(srcPath, dstPath)
if err != nil {
return err
}
}
}
return nil
}