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// Copyright (c) 2019-2023, 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 loop
import (
"fmt"
"os"
"syscall"
"testing"
"github.com/sylabs/singularity/v4/internal/pkg/test"
"golang.org/x/sys/unix"
)
func TestLoop(t *testing.T) {
test.EnsurePrivilege(t)
var i1 *unix.LoopInfo64
info := &unix.LoopInfo64{
Flags: unix.LO_FLAGS_AUTOCLEAR | unix.LO_FLAGS_READ_ONLY,
}
loopDevOne := &Device{
MaxLoopDevices: GetMaxLoopDevices(),
Info: info,
}
defer loopDevOne.Close()
loopDevTwo := &Device{
MaxLoopDevices: GetMaxLoopDevices(),
Info: info,
}
defer loopDevTwo.Close()
loopOne := -1
loopTwo := -1
// With wrong path and file pointer
if err := loopDevOne.AttachFromPath("", os.O_RDONLY, &loopOne); err == nil {
t.Errorf("unexpected success with a wrong path")
}
if err := loopDevOne.AttachFromFile(nil, os.O_RDONLY, &loopOne); err == nil {
t.Errorf("unexpected success with a nil file pointer")
}
// With good file
if err := loopDevOne.AttachFromPath("/etc/passwd", os.O_RDONLY, &loopOne); err != nil {
t.Error(err)
}
f, err := os.Open("/etc/passwd")
if err != nil {
t.Error(err)
}
defer f.Close()
fi, err := f.Stat()
if err != nil {
t.Error(err)
}
// With correct file pointer
if err := loopDevTwo.AttachFromFile(f, os.O_RDONLY, &loopTwo); err != nil {
t.Error(err)
}
if loopOne == loopTwo {
t.Errorf("attached to the same loop block device /dev/loop%d", loopOne)
}
// Test if loop devices matches associated file
_, err = GetStatusFromPath("")
if err == nil {
t.Errorf("unexpected success while returning status with non existent loop device")
}
path := fmt.Sprintf("/dev/loop%d", loopTwo)
i1, err = GetStatusFromPath(path)
if err != nil {
t.Error(err)
}
loopDevTwo.Close()
//nolint:forcetypeassert
st := fi.Sys().(*syscall.Stat_t)
// cast to uint64 as st.Dev is uint32 on MIPS
if uint64(st.Dev) != i1.Device || st.Ino != i1.Inode {
t.Errorf("bad file association for %s", path)
}
// With shared loop device
loopDevTwo.Shared = true
loopTwo = -1
if err := loopDevTwo.AttachFromPath("/etc/passwd", os.O_RDONLY, &loopTwo); err != nil {
t.Error(err)
}
loopDevTwo.Close()
if loopOne != loopTwo {
t.Errorf("not attached to the same loop block device /dev/loop%d", loopOne)
}
loopTwo = -1
if err := loopDevTwo.AttachFromPath("/etc/group", os.O_RDONLY, &loopTwo); err != nil {
t.Error(err)
}
loopDevTwo.Close()
if loopOne == loopTwo {
t.Errorf("attached to the same loop block device /dev/loop%d", loopOne)
}
// With MaxLoopDevices set to zero
loopDevTwo.MaxLoopDevices = 0
if err := loopDevTwo.AttachFromPath("/etc/group", os.O_RDONLY, &loopTwo); err == nil {
t.Errorf("unexpected success with MaxLoopDevices = 0")
}
}
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