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file.go
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file.go
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package fileutils
import (
"io"
"os"
"path"
"path/filepath"
"github.com/spf13/afero"
)
// MoveFile moves file from src to dst.
// By default the rename filesystem system call is used. If src and dst point to different volumes
// the file copy is used as a fallback
func MoveFile(fs afero.Fs, src, dst string) error {
if fs.Rename(src, dst) == nil {
return nil
}
// fallback
err := CopyFile(fs, src, dst)
if err != nil {
_ = fs.Remove(dst)
return err
}
if err := fs.Remove(src); err != nil {
return err
}
return nil
}
// CopyFile copies a file from source to dest and returns
// an error if any.
func CopyFile(fs afero.Fs, source, dest string) error {
// Open the source file.
src, err := fs.Open(source)
if err != nil {
return err
}
defer src.Close()
// Makes the directory needed to create the dst
// file.
err = fs.MkdirAll(filepath.Dir(dest), 0666) //nolint:gomnd
if err != nil {
return err
}
// Create the destination file.
dst, err := fs.OpenFile(dest, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0775) //nolint:gomnd
if err != nil {
return err
}
defer dst.Close()
// Copy the contents of the file.
_, err = io.Copy(dst, src)
if err != nil {
return err
}
// Copy the mode
info, err := fs.Stat(source)
if err != nil {
return err
}
err = fs.Chmod(dest, info.Mode())
if err != nil {
return err
}
return nil
}
// CommonPrefix returns common directory path of provided files
func CommonPrefix(sep byte, paths ...string) string {
// Handle special cases.
switch len(paths) {
case 0:
return ""
case 1:
return path.Clean(paths[0])
}
// Note, we treat string as []byte, not []rune as is often
// done in Go. (And sep as byte, not rune). This is because
// most/all supported OS' treat paths as string of non-zero
// bytes. A filename may be displayed as a sequence of Unicode
// runes (typically encoded as UTF-8) but paths are
// not required to be valid UTF-8 or in any normalized form
// (e.g. "é" (U+00C9) and "é" (U+0065,U+0301) are different
// file names.
c := []byte(path.Clean(paths[0]))
// We add a trailing sep to handle the case where the
// common prefix directory is included in the path list
// (e.g. /home/user1, /home/user1/foo, /home/user1/bar).
// path.Clean will have cleaned off trailing / separators with
// the exception of the root directory, "/" (in which case we
// make it "//", but this will get fixed up to "/" bellow).
c = append(c, sep)
// Ignore the first path since it's already in c
for _, v := range paths[1:] {
// Clean up each path before testing it
v = path.Clean(v) + string(sep)
// Find the first non-common byte and truncate c
if len(v) < len(c) {
c = c[:len(v)]
}
for i := 0; i < len(c); i++ {
if v[i] != c[i] {
c = c[:i]
break
}
}
}
// Remove trailing non-separator characters and the final separator
for i := len(c) - 1; i >= 0; i-- {
if c[i] == sep {
c = c[:i]
break
}
}
return string(c)
}