Hello,
Is there a way to set up a vfs.NameSpace filesystem backed up by Windows
filesystem without specific root, something like:
ns.Open("C:\\foo\\bar") => content of C:\foo\bar
ns.Open("D:\\qux") => content of D:\qux
and so on. Why do I need it? Imagine a local file system backed by
in-memory map (pretty common scenario in language server protocol where
some files may be read directly from disk and some may be provided by a
client while being edited). Sometimes it's impossible to predict what parts
of local file system may be needed and caller may be unable to declare all
the potential mount points.
fs.Bind("/", vfs.OS("/"), "/", vfs.BindBefore) does not work on Windows
because it resolves all the paths into \PATH and Windows FS is unable to
access such a file.
I think it's may be worth to add such a possibility and resolve paths on
Windows specific way (remove "\" prefix if there is any). What do you think?
Test case that fails on Windows
package vfs_test
import (
"io/ioutil"
"os"
"path/filepath"
"testing"
"golang.org/x/tools/godoc/vfs"
"golang.org/x/tools/godoc/vfs/mapfs"
)
func TestOpen(t *testing.T) {
tmpDir, err := ioutil.TempDir("", "vfs-localfs")
if err != nil {
t.Fatal(err)
}
defer os.RemoveAll(tmpDir)
if err = os.MkdirAll(tmpDir, 0700); err != nil {
t.Fatal(err)
}
file := filepath.Join(tmpDir, "foo")
if err = ioutil.WriteFile(file, []byte("bar"), 0600); err != nil {
t.Fatal(err)
}
fs := vfs.NameSpace{}
fs.Bind("/", vfs.OS("/"), "/", vfs.BindAfter)
_, err = fs.Open(file)
if err != nil {
t.Errorf("Cannot read local file (%s)", err)
}
}
I can come with a pull request if needed.
Regards,
Alex
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