func start(dataset string, mount mount) {
ds, err := spec.GetDataset(dataset)
if err != nil {
fmt.Fprintf(os.Stderr, "Could not create dataset: %s\n", err)
return
}
hv, ok := ds.MaybeHeadValue()
if ok {
if !types.IsSubtype(fsType, hv.Type()) {
fmt.Fprintf(os.Stderr, "Invalid dataset head: expected type '%s' but found type '%s'\n", fsType.Desc.(types.StructDesc).Name, hv.Type().Desc.(types.StructDesc).Name)
return
}
} else {
rootAttr := makeAttr(0777) // create the root directory with maximally permissive permissions
rootDir := types.NewStructWithType(directoryType, types.ValueSlice{types.NewMap()})
rootInode := types.NewStructWithType(inodeType, types.ValueSlice{rootAttr, rootDir})
hv = types.NewStructWithType(fsType, types.ValueSlice{rootInode})
}
mount(&nomsFS{
FileSystem: pathfs.NewDefaultFileSystem(),
ds: ds,
head: hv.(types.Struct),
mdLock: &sync.Mutex{},
nodes: make(map[hash.Hash]*nNode),
})
}
func IsCommitType(t *types.Type) bool {
return types.IsSubtype(valueCommitType, t)
}