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// Package file contains functions for working with files and directories on the local filesystem
package file
import (
"io/ioutil"
"os"
"path/filepath"
"strings"
"github.com/hairyhenderson/gomplate/v3/internal/iohelpers"
"github.com/pkg/errors"
"github.com/spf13/afero"
)
// for overriding in tests
var fs = afero.NewOsFs()
// Read the contents of the referenced file, as a string.
func Read(filename string) (string, error) {
inFile, err := fs.OpenFile(filename, os.O_RDONLY, 0)
if err != nil {
return "", errors.Wrapf(err, "failed to open %s", filename)
}
// nolint: errcheck
defer inFile.Close()
bytes, err := ioutil.ReadAll(inFile)
if err != nil {
err = errors.Wrapf(err, "read failed for %s", filename)
return "", err
}
return string(bytes), nil
}
// ReadDir gets a directory listing.
func ReadDir(path string) ([]string, error) {
f, err := fs.Open(path)
if err != nil {
return nil, err
}
i, err := f.Stat()
if err != nil {
return nil, err
}
if i.IsDir() {
return f.Readdirnames(0)
}
return nil, errors.New("file is not a directory")
}
// Write the given content to the file, truncating any existing file, and
// creating the directory structure leading up to it if necessary.
func Write(filename string, content []byte) error {
err := assertPathInWD(filename)
if err != nil {
return errors.Wrapf(err, "failed to open %s", filename)
}
fi, err := os.Stat(filename)
if err != nil && !os.IsNotExist(err) {
return errors.Wrapf(err, "failed to stat %s", filename)
}
mode := iohelpers.NormalizeFileMode(0o644)
if fi != nil {
mode = fi.Mode()
}
err = fs.MkdirAll(filepath.Dir(filename), 0o755)
if err != nil {
return errors.Wrapf(err, "failed to make dirs for %s", filename)
}
inFile, err := fs.OpenFile(filename, os.O_RDWR|os.O_CREATE|os.O_TRUNC, mode)
if err != nil {
return errors.Wrapf(err, "failed to open %s", filename)
}
defer inFile.Close()
n, err := inFile.Write(content)
if err != nil {
return errors.Wrapf(err, "failed to write %s", filename)
}
if n != len(content) {
return errors.Wrapf(err, "short write on %s (%d bytes)", filename, n)
}
return nil
}
func assertPathInWD(filename string) error {
wd, err := os.Getwd()
if err != nil {
return err
}
f, err := filepath.Abs(filename)
if err != nil {
return err
}
r, err := filepath.Rel(wd, f)
if err != nil {
return err
}
if strings.HasPrefix(r, "..") {
return errors.Errorf("path %s not contained by working directory %s (rel: %s)", filename, wd, r)
}
return nil
}
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