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// Copyright (c) 2019-2022, Sylabs Inc. All rights reserved.
// This software is licensed under a 3-clause BSD license. Please consult the
// LICENSE.md file distributed with the sources of this project regarding your
// rights to use or distribute this software.
package lock
import (
"os"
"testing"
"time"
"github.com/sylabs/singularity/v4/internal/pkg/test"
)
func TestExclusive(t *testing.T) {
test.DropPrivilege(t)
defer test.ResetPrivilege(t)
if _, err := Exclusive(""); err == nil {
t.Errorf("unexpected success with empty path")
}
ch := make(chan bool, 1)
fd, err := Exclusive("/dev")
if err != nil {
t.Error(err)
}
go func() {
Exclusive("/dev")
ch <- true
}()
select {
case <-time.After(1 * time.Second):
Release(fd)
if err := Release(fd); err == nil {
t.Errorf("unexpected success during Release second call")
}
case <-ch:
t.Errorf("lock acquired")
}
}
func TestByteRange(t *testing.T) {
test.DropPrivilege(t)
defer test.ResetPrivilege(t)
// test with a wrong file descriptor
br := NewByteRange(1111, 0, 0)
if err := br.Lock(); err == nil {
t.Fatalf("unexpected success with a wrong file descriptor")
}
// create the temporary test file used for locking
f, err := os.CreateTemp("", "byterange-")
if err != nil {
t.Fatalf("failed to create temporary lock file: %s", err)
}
testFile := f.Name()
defer os.Remove(testFile)
f.Close()
// write some content in test file
if err := os.WriteFile(testFile, []byte("testing\n"), 0o644); err != nil {
t.Fatalf("failed to write content in testfile %s: %s", testFile, err)
}
// re-open it and use it for testing
f, err = os.OpenFile(testFile, os.O_RDWR, 0)
if err != nil {
t.Fatalf("failed to open %s: %s", testFile, err)
}
defer f.Close()
// create the byte-range lock
br = NewByteRange(int(f.Fd()), 0, 1)
// acquire the lock, must succeed
if err := br.Lock(); err != nil {
t.Fatalf("unexpected error while locking file %s: %s", testFile, err)
}
// at this stage we can't test the condition where
// the lock is already acquired as we are in the same
// process where locks are shared, so we just release it
if err := br.Unlock(); err != nil {
t.Fatalf("unexpected error while releasing lock: %s", err)
}
// open /dev/null read-only
f, err = os.Open("/dev/null")
if err != nil {
t.Fatalf("failed to open /dev/null: %s", err)
}
br = NewByteRange(int(f.Fd()), 0, 1)
// acquire a write lock, must fail
if err := br.Lock(); err == nil {
t.Fatalf("unexpected success while locking %s", f.Name())
}
// acquire a read lock, must succeed
if err := br.RLock(); err != nil {
t.Fatalf("unexpected error while getting lock for %s", f.Name())
}
}
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