func TestReadOnly(t *testing.T) {
m := map[string]string{"x": "y"}
rfs := mapfs.New(m)
wfs := rwvfs.ReadOnly(rfs)
if _, err := rfs.Stat("/x"); err != nil {
t.Error(err)
}
_, err := wfs.Create("/y")
if want := (&os.PathError{"create", "/y", rwvfs.ErrReadOnly}); !reflect.DeepEqual(err, want) {
t.Errorf("Create: got err %v, want %v", err, want)
}
err = wfs.Mkdir("/y")
if want := (&os.PathError{"mkdir", "/y", rwvfs.ErrReadOnly}); !reflect.DeepEqual(err, want) {
t.Errorf("Mkdir: got err %v, want %v", err, want)
}
err = wfs.Remove("/y")
if want := (&os.PathError{"remove", "/y", rwvfs.ErrReadOnly}); !reflect.DeepEqual(err, want) {
t.Errorf("Remove: got err %v, want %v", err, want)
}
}
// ReadCached reads a Tree's configuration from all of its source unit
// definition files (which may either be in a local VFS rooted at a
// .srclib-cache/<COMMITID> dir, or a remote VFS). It does not read
// the Srcfile; the Srcfile's directives are already accounted for in
// the cached source unit definition files.
//
// bdfs should be a VFS obtained from a call to
// (buildstore.RepoBuildStore).Commit.
func ReadCached(bdfs vfs.FileSystem) (*Tree, error) {
if _, err := bdfs.Lstat("."); os.IsNotExist(err) {
return nil, fmt.Errorf("build cache dir does not exist (did you run `srclib config` to create it)?")
} else if err != nil {
return nil, err
}
// Collect all **/*.unit.json files.
var unitFiles []string
unitSuffix := buildstore.DataTypeSuffix(unit.SourceUnit{})
w := fs.WalkFS(".", rwvfs.Walkable(rwvfs.ReadOnly(bdfs)))
for w.Step() {
if err := w.Err(); err != nil {
return nil, err
}
if path := w.Path(); strings.HasSuffix(path, unitSuffix) {
unitFiles = append(unitFiles, path)
}
}
// Parse units
sort.Strings(unitFiles)
units := make([]*unit.SourceUnit, len(unitFiles))
par := parallel.NewRun(runtime.GOMAXPROCS(0))
for i_, unitFile_ := range unitFiles {
i, unitFile := i_, unitFile_
par.Acquire()
go func() {
defer par.Release()
f, err := bdfs.Open(unitFile)
if err != nil {
par.Error(err)
return
}
if err := json.NewDecoder(f).Decode(&units[i]); err != nil {
f.Close()
par.Error(err)
return
}
if err := f.Close(); err != nil {
par.Error(err)
return
}
}()
}
if err := par.Wait(); err != nil {
return nil, err
}
return &Tree{SourceUnits: units}, nil
}
