0ab2227377
`func Lookup(dir string) (Info, error)` returns the mount info that corresponds to the dir Signed-off-by: Akihiro Suda <suda.akihiro@lab.ntt.co.jp>
54 lines
1.2 KiB
Go
54 lines
1.2 KiB
Go
// +build linux
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package testutil
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import (
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"io/ioutil"
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"os"
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"os/exec"
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"strings"
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"testing"
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)
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// NewLoopback creates a loopback device, and returns its device name (/dev/loopX), and its clean-up function.
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func NewLoopback(t *testing.T, size int64) (string, func()) {
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// create temporary file for the disk image
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file, err := ioutil.TempFile("", "containerd-test-loopback")
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if err != nil {
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t.Fatalf("could not create temporary file for loopback: %v", err)
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}
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if err := file.Truncate(size); err != nil {
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t.Fatal(err)
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}
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file.Close()
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// create device
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losetup := exec.Command("losetup", "--find", "--show", file.Name())
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p, err := losetup.Output()
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if err != nil {
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t.Fatal(err)
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}
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deviceName := strings.TrimSpace(string(p))
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t.Logf("Created loop device %s (using %s)", deviceName, file.Name())
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cleanup := func() {
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// detach device
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t.Logf("Removing loop device %s", deviceName)
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losetup := exec.Command("losetup", "--detach", deviceName)
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err := losetup.Run()
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if err != nil {
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t.Error("Could not remove loop device", deviceName, err)
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}
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// remove file
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t.Logf("Removing temporary file %s", file.Name())
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if err = os.Remove(file.Name()); err != nil {
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t.Error(err)
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}
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}
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return deviceName, cleanup
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}
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