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package env
import (
"errors"
"os"
"testing"
"github.com/spf13/afero"
"github.com/stretchr/testify/assert"
)
func TestGetenv(t *testing.T) {
assert.Empty(t, Getenv("FOOBARBAZ"))
assert.Equal(t, os.Getenv("USER"), Getenv("USER"))
assert.Equal(t, "default value", Getenv("BLAHBLAHBLAH", "default value"))
}
func TestGetenvFile(t *testing.T) {
fs := afero.NewMemMapFs()
_ = fs.Mkdir("/tmp", 0777)
f, _ := fs.Create("/tmp/foo")
_, _ = f.Write([]byte("foo"))
defer os.Unsetenv("FOO_FILE")
os.Setenv("FOO_FILE", "/tmp/foo")
assert.Equal(t, "foo", getenvVFS(fs, "FOO", "bar"))
os.Setenv("FOO_FILE", "/tmp/missing")
assert.Equal(t, "bar", getenvVFS(fs, "FOO", "bar"))
_, _ = fs.Create("/tmp/unreadable")
fs = writeOnly(fs)
os.Setenv("FOO_FILE", "/tmp/unreadable")
assert.Equal(t, "bar", getenvVFS(fs, "FOO", "bar"))
}
func TestExpandEnv(t *testing.T) {
assert.Empty(t, ExpandEnv("${FOOBARBAZ}"))
assert.Equal(t, os.Getenv("USER"), ExpandEnv("$USER"))
assert.Equal(t, "something", ExpandEnv("something$BLAHBLAHBLAH"))
assert.Equal(t, os.Getenv("USER")+": "+os.Getenv("HOME"),
ExpandEnv("$USER: ${HOME}"))
}
func TestExpandEnvFile(t *testing.T) {
fs := afero.NewMemMapFs()
_ = fs.Mkdir("/tmp", 0777)
f, _ := fs.Create("/tmp/foo")
_, _ = f.Write([]byte("foo"))
defer os.Unsetenv("FOO_FILE")
os.Setenv("FOO_FILE", "/tmp/foo")
assert.Equal(t, "foo is foo", expandEnvVFS(fs, "foo is $FOO"))
os.Setenv("FOO_FILE", "/tmp/missing")
assert.Equal(t, "empty", expandEnvVFS(fs, "${FOO}empty"))
_, _ = fs.Create("/tmp/unreadable")
fs = writeOnly(fs)
os.Setenv("FOO_FILE", "/tmp/unreadable")
assert.Equal(t, "", expandEnvVFS(fs, "${FOO}"))
}
// Maybe extract this into a separate package sometime...
// writeOnly - represents a filesystem that's writeable, but read operations fail
func writeOnly(fs afero.Fs) afero.Fs {
return &woFS{fs}
}
type woFS struct {
afero.Fs
}
func (fs woFS) Remove(name string) error {
return fs.Fs.Remove(name)
}
func (fs woFS) Rename(oldpath, newpath string) error {
return fs.Fs.Rename(oldpath, newpath)
}
func (fs woFS) Mkdir(name string, perm os.FileMode) error {
return fs.Fs.Mkdir(name, perm)
}
func (fs woFS) OpenFile(name string, flag int, perm os.FileMode) (afero.File, error) {
f, err := fs.Fs.OpenFile(name, flag, perm)
if err != nil {
return writeOnlyFile(f), err
}
return writeOnlyFile(f), nil
}
func (fs woFS) ReadDir(_ string) ([]os.FileInfo, error) {
return nil, ErrWriteOnly
}
func (fs woFS) Stat(_ string) (os.FileInfo, error) {
return nil, ErrWriteOnly
}
func writeOnlyFile(f afero.File) afero.File {
return &woFile{f}
}
type woFile struct {
afero.File
}
// Write is disabled and returns ErrWriteOnly
func (f woFile) Write(p []byte) (n int, err error) {
return f.File.Write(p)
}
// Read is disabled and returns ErrWriteOnly
func (f woFile) Read([]byte) (n int, err error) {
return 0, ErrWriteOnly
}
var ErrWriteOnly = errors.New("filesystem is write-only")
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