volume/local: add tests for size quota

Signed-off-by: Timo Rothenpieler <timo@rothenpieler.org>

volume/local/local_linux_test.go

@@ -0,0 +1,97 @@
+// +build linux
+
+package local // import "github.com/docker/docker/volume/local"
+
+import (
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/docker/docker/pkg/idtools"
+	"github.com/docker/docker/quota"
+	"gotest.tools/v3/assert"
+	is "gotest.tools/v3/assert/cmp"
+)
+
+const quotaSize = 1024 * 1024
+const quotaSizeLiteral = "1M"
+
+func TestQuota(t *testing.T) {
+	if msg, ok := quota.CanTestQuota(); !ok {
+		t.Skip(msg)
+	}
+
+	// get sparse xfs test image
+	imageFileName, err := quota.PrepareQuotaTestImage(t)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.Remove(imageFileName)
+
+	t.Run("testVolWithQuota", quota.WrapMountTest(imageFileName, true, testVolWithQuota))
+	t.Run("testVolQuotaUnsupported", quota.WrapMountTest(imageFileName, false, testVolQuotaUnsupported))
+}
+
+func testVolWithQuota(t *testing.T, mountPoint, backingFsDev, testDir string) {
+	r, err := New(testDir, idtools.Identity{UID: os.Geteuid(), GID: os.Getegid()})
+	if err != nil {
+		t.Fatal(err)
+	}
+	assert.Assert(t, r.quotaCtl != nil)
+
+	vol, err := r.Create("testing", map[string]string{"size": quotaSizeLiteral})
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	dir, err := vol.Mount("1234")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer func() {
+		if err := vol.Unmount("1234"); err != nil {
+			t.Fatal(err)
+		}
+	}()
+
+	testfile := filepath.Join(dir, "testfile")
+
+	// test writing file smaller than quota
+	assert.NilError(t, ioutil.WriteFile(testfile, make([]byte, quotaSize/2), 0644))
+	assert.NilError(t, os.Remove(testfile))
+
+	// test writing fiel larger than quota
+	err = ioutil.WriteFile(testfile, make([]byte, quotaSize+1), 0644)
+	assert.ErrorContains(t, err, "")
+	if _, err := os.Stat(testfile); err == nil {
+		assert.NilError(t, os.Remove(testfile))
+	}
+}
+
+func testVolQuotaUnsupported(t *testing.T, mountPoint, backingFsDev, testDir string) {
+	r, err := New(testDir, idtools.Identity{UID: os.Geteuid(), GID: os.Getegid()})
+	if err != nil {
+		t.Fatal(err)
+	}
+	assert.Assert(t, is.Nil(r.quotaCtl))
+
+	_, err = r.Create("testing", map[string]string{"size": quotaSizeLiteral})
+	assert.ErrorContains(t, err, "no quota support")
+
+	vol, err := r.Create("testing", nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// this could happen if someone moves volumes from storage with
+	// quota support to some place without
+	lv, ok := vol.(*localVolume)
+	assert.Assert(t, ok)
+	lv.opts = &optsConfig{
+		Quota: quota.Quota{Size: quotaSize},
+	}
+
+	_, err = vol.Mount("1234")
+	assert.ErrorContains(t, err, "no quota support")
+}