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package datafs
import (
"errors"
"io/fs"
"testing"
"testing/fstest"
"github.com/hack-pad/hackpadfs"
"github.com/stretchr/testify/assert"
)
func TestGetenvFsys(t *testing.T) {
fsys := fs.FS(fstest.MapFS{
"tmp": &fstest.MapFile{Mode: fs.ModeDir | 0o777},
"tmp/foo": &fstest.MapFile{Data: []byte("foo")},
"tmp/unreadable": &fstest.MapFile{Data: []byte("foo"), Mode: 0o000},
})
fsys = WrapWdFS(fsys)
t.Setenv("FOO_FILE", "/tmp/foo")
assert.Equal(t, "foo", GetenvFsys(fsys, "FOO", "bar"))
t.Setenv("FOO_FILE", "/tmp/missing")
assert.Equal(t, "bar", GetenvFsys(fsys, "FOO", "bar"))
fsys = writeOnly(fsys)
t.Setenv("FOO_FILE", "/tmp/unreadable")
assert.Equal(t, "bar", GetenvFsys(fsys, "FOO", "bar"))
}
func TestExpandEnvFsys(t *testing.T) {
fsys := fs.FS(fstest.MapFS{
"tmp": &fstest.MapFile{Mode: fs.ModeDir | 0o777},
"tmp/foo": &fstest.MapFile{Data: []byte("foo")},
"tmp/unreadable": &fstest.MapFile{Data: []byte("foo"), Mode: 0o000},
})
fsys = WrapWdFS(fsys)
t.Setenv("FOO_FILE", "/tmp/foo")
assert.Equal(t, "foo is foo", ExpandEnvFsys(fsys, "foo is $FOO"))
t.Setenv("FOO_FILE", "/tmp/missing")
assert.Equal(t, "empty", ExpandEnvFsys(fsys, "${FOO}empty"))
fsys = writeOnly(fsys)
t.Setenv("FOO_FILE", "/tmp/unreadable")
assert.Empty(t, ExpandEnvFsys(fsys, "${FOO}"))
}
// Maybe extract this into a separate package sometime...
// writeOnly - represents a filesystem that's writeable, but read operations fail
func writeOnly(fsys fs.FS) fs.FS {
return &woFS{fsys}
}
type woFS struct {
fsys fs.FS
}
func (fsys woFS) Open(name string) (fs.File, error) {
f, err := fsys.fsys.Open(name)
return writeOnlyFile(f), err
}
func (fsys woFS) ReadDir(_ string) ([]fs.DirEntry, error) {
return nil, ErrWriteOnly
}
func (fsys woFS) Stat(_ string) (fs.FileInfo, error) {
return nil, ErrWriteOnly
}
func writeOnlyFile(f fs.File) fs.File {
if f == nil {
return nil
}
return &woFile{f}
}
type woFile struct {
fs.File
}
// Write -
func (f woFile) Write(p []byte) (n int, err error) {
return hackpadfs.WriteFile(f.File, 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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