1 files changed, 61 insertions, 0 deletions
diff --git a/src/os/user/lookup_plan9.go b/src/os/user/lookup_plan9.go
new file mode 100644
index 0000000..33ae3a6
--- /dev/null
+++ b/src/os/user/lookup_plan9.go
@@ -0,0 +1,61 @@
+// Copyright 2013 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package user
+
+import (
+	"fmt"
+	"os"
+	"syscall"
+)
+
+// Partial os/user support on Plan 9.
+// Supports Current(), but not Lookup()/LookupId().
+// The latter two would require parsing /adm/users.
+const (
+	userFile = "/dev/user"
+)
+
+func init() {
+	groupImplemented = false
+}
+
+func current() (*User, error) {
+	ubytes, err := os.ReadFile(userFile)
+	if err != nil {
+		return nil, fmt.Errorf("user: %s", err)
+	}
+
+	uname := string(ubytes)
+
+	u := &User{
+		Uid:      uname,
+		Gid:      uname,
+		Username: uname,
+		Name:     uname,
+		HomeDir:  os.Getenv("home"),
+	}
+
+	return u, nil
+}
+
+func lookupUser(username string) (*User, error) {
+	return nil, syscall.EPLAN9
+}
+
+func lookupUserId(uid string) (*User, error) {
+	return nil, syscall.EPLAN9
+}
+
+func lookupGroup(groupname string) (*Group, error) {
+	return nil, syscall.EPLAN9
+}
+
+func lookupGroupId(string) (*Group, error) {
+	return nil, syscall.EPLAN9
+}
+
+func listGroups(*User) ([]string, error) {
+	return nil, syscall.EPLAN9
+}