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// Copyright 2009 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.

// +build darwin freebsd linux netbsd openbsd

package os_test

import (
        . "os"
        "runtime"
        "syscall"
        "testing"
)

func checkUidGid(t *testing.T, path string, uid, gid int) {
        dir, err := Stat(path)
        if err != nil {
                t.Fatalf("Stat %q (looking for uid/gid %d/%d): %s", path, uid, gid, err)
        }
        sys := dir.Sys().(*syscall.Stat_t)
        if int(sys.Uid) != uid {
                t.Errorf("Stat %q: uid %d want %d", path, sys.Uid, uid)
        }
        if int(sys.Gid) != gid {
                t.Errorf("Stat %q: gid %d want %d", path, sys.Gid, gid)
        }
}

func TestChown(t *testing.T) {
        // Chown is not supported under windows or Plan 9.
        // Plan9 provides a native ChownPlan9 version instead.
        if runtime.GOOS == "windows" || runtime.GOOS == "plan9" {
                return
        }
        // Use TempDir() to make sure we're on a local file system,
        // so that the group ids returned by Getgroups will be allowed
        // on the file.  On NFS, the Getgroups groups are
        // basically useless.
        f := newFile("TestChown", t)
        defer Remove(f.Name())
        defer f.Close()
        dir, err := f.Stat()
        if err != nil {
                t.Fatalf("stat %s: %s", f.Name(), err)
        }

        // Can't change uid unless root, but can try
        // changing the group id.  First try our current group.
        gid := Getgid()
        t.Log("gid:", gid)
        if err = Chown(f.Name(), -1, gid); err != nil {
                t.Fatalf("chown %s -1 %d: %s", f.Name(), gid, err)
        }
        sys := dir.Sys().(*syscall.Stat_t)
        checkUidGid(t, f.Name(), int(sys.Uid), gid)

        // Then try all the auxiliary groups.
        groups, err := Getgroups()
        if err != nil {
                t.Fatalf("getgroups: %s", err)
        }
        t.Log("groups: ", groups)
        for _, g := range groups {
                if err = Chown(f.Name(), -1, g); err != nil {
                        t.Fatalf("chown %s -1 %d: %s", f.Name(), g, err)
                }
                checkUidGid(t, f.Name(), int(sys.Uid), g)

                // change back to gid to test fd.Chown
                if err = f.Chown(-1, gid); err != nil {
                        t.Fatalf("fchown %s -1 %d: %s", f.Name(), gid, err)
                }
                checkUidGid(t, f.Name(), int(sys.Uid), gid)
        }
}