a360324f62
This commit cleans up the package structure, to make two new top-level packages `internal` (for internal-use packages) and `pkg` (for general shared utility code).
107 lines
2.1 KiB
Go
107 lines
2.1 KiB
Go
package fsx
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import (
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"errors"
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"io"
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"os"
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"path/filepath"
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)
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var ErrCopySameFile = errors.New("src and dst must be different files")
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// CopyFile copies a file from src to dst.
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// When dst and src are the same file, returns ErrCopySameFile.
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func CopyFile(dst, src string) error {
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if SameFile(src, dst) {
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return ErrCopySameFile
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}
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// open the source
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srcFile, err := os.Open(src)
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if err != nil {
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return err
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}
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defer srcFile.Close()
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// stat it to get the mode!
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srcStat, err := srcFile.Stat()
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if err != nil {
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return err
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}
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// open or create the destination
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dstFile, err := os.OpenFile(dst, os.O_WRONLY|os.O_CREATE, srcStat.Mode())
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if err != nil {
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return err
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}
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defer dstFile.Close()
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// and do the copy!
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_, err = io.Copy(dstFile, srcFile)
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return err
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}
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var ErrCopyNoDirectory = errors.New("dst is not a directory")
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// CopyDirectory copies the directory src to dst recursively.
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// The destination directory must exist, or an error is returned.
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//
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// onCopy, when not nil, is called for each file or directory being copied.
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func CopyDirectory(dst, src string, onCopy func(dst, src string)) error {
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// sanity checks
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if SameFile(src, dst) {
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return ErrCopySameFile
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}
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if !IsDirectory(dst) {
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return ErrCopyNoDirectory
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}
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// call onCopy for this directory!
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if onCopy != nil {
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onCopy(dst, src)
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}
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// iterate over the entries or bail out
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entries, err := os.ReadDir(src)
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if err != nil {
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return err
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}
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for _, entry := range entries {
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name := entry.Name()
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eDest := filepath.Join(dst, name)
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eSrc := filepath.Join(src, name)
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// it is not a directory => Use CopyFile
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if !entry.IsDir() {
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if onCopy != nil {
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onCopy(eDest, eSrc)
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}
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// do the copy!
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if err := CopyFile(eDest, eSrc); err != nil {
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return err
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}
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continue
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}
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// find out the mode of the entry
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eInfo, err := entry.Info()
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if err != nil {
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return err
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}
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// make the target directory
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if err := os.Mkdir(eDest, eInfo.Mode()); err != nil {
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return err
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}
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// do the copy!
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if err := CopyDirectory(eDest, eSrc, onCopy); err != nil {
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return err
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}
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}
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return nil
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}
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