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// Copyright 2018 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package renameio
import (
"io/ioutil"
"os"
"path/filepath"
"syscall"
"testing"
)
func TestTempDir(t *testing.T) {
if tmpdir, ok := os.LookupEnv("TMPDIR"); ok {
defer os.Setenv("TMPDIR", tmpdir) // restore
} else {
defer os.Unsetenv("TMPDIR") // restore
}
mount1, err := ioutil.TempDir("", "tempdirtest")
if err != nil {
t.Fatal(err)
}
defer os.RemoveAll(mount1)
mount2, err := ioutil.TempDir("", "tempdirtest")
if err != nil {
t.Fatal(err)
}
defer os.RemoveAll(mount2)
if err := syscall.Mount("tmpfs", mount1, "tmpfs", 0, ""); err != nil {
t.Skipf("cannot mount tmpfs on %s: %v", mount1, err)
}
defer syscall.Unmount(mount1, 0)
if err := syscall.Mount("tmpfs", mount2, "tmpfs", 0, ""); err != nil {
t.Skipf("cannot mount tmpfs on %s: %v", mount2, err)
}
defer syscall.Unmount(mount2, 0)
tests := []struct {
name string
dir string
path string
TMPDIR string
want string
}{
{
name: "implicit TMPDIR",
path: filepath.Join(os.TempDir(), "foo.txt"),
want: os.TempDir(),
},
{
name: "explicit TMPDIR",
path: filepath.Join(mount1, "foo.txt"),
TMPDIR: mount1,
want: mount1,
},
{
name: "explicit unsuitable TMPDIR",
path: filepath.Join(mount1, "foo.txt"),
TMPDIR: mount2,
want: mount1,
},
{
name: "nonexistant TMPDIR",
path: filepath.Join(mount1, "foo.txt"),
TMPDIR: "/nonexistant",
want: mount1,
},
{
name: "caller-specified",
dir: "/overridden",
path: filepath.Join(mount1, "foo.txt"),
TMPDIR: "/nonexistant",
want: "/overridden",
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
if tt.TMPDIR == "" {
os.Unsetenv("TMPDIR")
} else {
os.Setenv("TMPDIR", tt.TMPDIR)
}
if got := tempDir(tt.dir, tt.path); got != tt.want {
t.Fatalf("tempDir(%q, %q): got %q, want %q", tt.dir, tt.path, got, tt.want)
}
})
}
}
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