252 lines
5.7 KiB
Go
252 lines
5.7 KiB
Go
// 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 fs_test
|
|
|
|
import (
|
|
"testing"
|
|
|
|
"gvisor.googlesource.com/gvisor/pkg/sentry/context"
|
|
"gvisor.googlesource.com/gvisor/pkg/sentry/context/contexttest"
|
|
"gvisor.googlesource.com/gvisor/pkg/sentry/fs"
|
|
ramfstest "gvisor.googlesource.com/gvisor/pkg/sentry/fs/ramfs/test"
|
|
"gvisor.googlesource.com/gvisor/pkg/syserror"
|
|
)
|
|
|
|
func TestLookup(t *testing.T) {
|
|
ctx := contexttest.Context(t)
|
|
for _, test := range []struct {
|
|
// Test description.
|
|
desc string
|
|
|
|
// Lookup parameters.
|
|
dir *fs.Inode
|
|
name string
|
|
|
|
// Want from lookup.
|
|
err error
|
|
found bool
|
|
hasUpper bool
|
|
hasLower bool
|
|
}{
|
|
{
|
|
desc: "no upper, lower has name",
|
|
dir: fs.NewTestOverlayDir(ctx,
|
|
nil, /* upper */
|
|
newTestRamfsDir(ctx, []dirContent{
|
|
{
|
|
name: "a",
|
|
dir: false,
|
|
},
|
|
}, nil), /* lower */
|
|
),
|
|
name: "a",
|
|
found: true,
|
|
hasUpper: false,
|
|
hasLower: true,
|
|
},
|
|
{
|
|
desc: "no lower, upper has name",
|
|
dir: fs.NewTestOverlayDir(ctx,
|
|
newTestRamfsDir(ctx, []dirContent{
|
|
{
|
|
name: "a",
|
|
dir: false,
|
|
},
|
|
}, nil), /* upper */
|
|
nil, /* lower */
|
|
),
|
|
name: "a",
|
|
found: true,
|
|
hasUpper: true,
|
|
hasLower: false,
|
|
},
|
|
{
|
|
desc: "upper and lower, only lower has name",
|
|
dir: fs.NewTestOverlayDir(ctx,
|
|
newTestRamfsDir(ctx, []dirContent{
|
|
{
|
|
name: "b",
|
|
dir: false,
|
|
},
|
|
}, nil), /* upper */
|
|
newTestRamfsDir(ctx, []dirContent{
|
|
{
|
|
name: "a",
|
|
dir: false,
|
|
},
|
|
}, nil), /* lower */
|
|
),
|
|
name: "a",
|
|
found: true,
|
|
hasUpper: false,
|
|
hasLower: true,
|
|
},
|
|
{
|
|
desc: "upper and lower, only upper has name",
|
|
dir: fs.NewTestOverlayDir(ctx,
|
|
newTestRamfsDir(ctx, []dirContent{
|
|
{
|
|
name: "a",
|
|
dir: false,
|
|
},
|
|
}, nil), /* upper */
|
|
newTestRamfsDir(ctx, []dirContent{
|
|
{
|
|
name: "b",
|
|
dir: false,
|
|
},
|
|
}, nil), /* lower */
|
|
),
|
|
name: "a",
|
|
found: true,
|
|
hasUpper: true,
|
|
hasLower: false,
|
|
},
|
|
{
|
|
desc: "upper and lower, both have file",
|
|
dir: fs.NewTestOverlayDir(ctx,
|
|
newTestRamfsDir(ctx, []dirContent{
|
|
{
|
|
name: "a",
|
|
dir: false,
|
|
},
|
|
}, nil), /* upper */
|
|
newTestRamfsDir(ctx, []dirContent{
|
|
{
|
|
name: "a",
|
|
dir: false,
|
|
},
|
|
}, nil), /* lower */
|
|
),
|
|
name: "a",
|
|
found: true,
|
|
hasUpper: true,
|
|
hasLower: false,
|
|
},
|
|
{
|
|
desc: "upper and lower, both have directory",
|
|
dir: fs.NewTestOverlayDir(ctx,
|
|
newTestRamfsDir(ctx, []dirContent{
|
|
{
|
|
name: "a",
|
|
dir: true,
|
|
},
|
|
}, nil), /* upper */
|
|
newTestRamfsDir(ctx, []dirContent{
|
|
{
|
|
name: "a",
|
|
dir: true,
|
|
},
|
|
}, nil), /* lower */
|
|
),
|
|
name: "a",
|
|
found: true,
|
|
hasUpper: true,
|
|
hasLower: true,
|
|
},
|
|
{
|
|
desc: "upper and lower, upper negative masks lower file",
|
|
dir: fs.NewTestOverlayDir(ctx,
|
|
newTestRamfsDir(ctx, nil, []string{"a"}), /* upper */
|
|
newTestRamfsDir(ctx, []dirContent{
|
|
{
|
|
name: "a",
|
|
dir: false,
|
|
},
|
|
}, nil), /* lower */
|
|
),
|
|
name: "a",
|
|
found: false,
|
|
hasUpper: false,
|
|
hasLower: false,
|
|
},
|
|
{
|
|
desc: "upper and lower, upper negative does not mask lower file",
|
|
dir: fs.NewTestOverlayDir(ctx,
|
|
newTestRamfsDir(ctx, nil, []string{"b"}), /* upper */
|
|
newTestRamfsDir(ctx, []dirContent{
|
|
{
|
|
name: "a",
|
|
dir: false,
|
|
},
|
|
}, nil), /* lower */
|
|
),
|
|
name: "a",
|
|
found: true,
|
|
hasUpper: false,
|
|
hasLower: true,
|
|
},
|
|
} {
|
|
t.Run(test.desc, func(t *testing.T) {
|
|
dirent, err := test.dir.Lookup(ctx, test.name)
|
|
if err != test.err {
|
|
t.Fatalf("lookup got error %v, want %v", err, test.err)
|
|
}
|
|
if test.found && dirent.IsNegative() {
|
|
t.Fatalf("lookup expected to find %q, got negative dirent", test.name)
|
|
}
|
|
if !test.found {
|
|
return
|
|
}
|
|
if hasUpper := dirent.Inode.TestHasUpperFS(); hasUpper != test.hasUpper {
|
|
t.Fatalf("lookup got upper filesystem %v, want %v", hasUpper, test.hasUpper)
|
|
}
|
|
if hasLower := dirent.Inode.TestHasLowerFS(); hasLower != test.hasLower {
|
|
t.Errorf("lookup got lower filesystem %v, want %v", hasLower, test.hasLower)
|
|
}
|
|
})
|
|
}
|
|
}
|
|
|
|
type dir struct {
|
|
fs.InodeOperations
|
|
|
|
// list of negative child names.
|
|
negative []string
|
|
}
|
|
|
|
func (d *dir) Getxattr(inode *fs.Inode, name string) ([]byte, error) {
|
|
for _, n := range d.negative {
|
|
if name == fs.XattrOverlayWhiteout(n) {
|
|
return []byte("y"), nil
|
|
}
|
|
}
|
|
return nil, syserror.ENOATTR
|
|
}
|
|
|
|
type dirContent struct {
|
|
name string
|
|
dir bool
|
|
}
|
|
|
|
func newTestRamfsDir(ctx context.Context, contains []dirContent, negative []string) *fs.Inode {
|
|
msrc := fs.NewCachingMountSource(nil, fs.MountSourceFlags{})
|
|
contents := make(map[string]*fs.Inode)
|
|
for _, c := range contains {
|
|
if c.dir {
|
|
contents[c.name] = newTestRamfsDir(ctx, nil, nil)
|
|
} else {
|
|
contents[c.name] = fs.NewInode(ramfstest.NewFile(ctx, fs.FilePermissions{}), msrc, fs.StableAttr{Type: fs.RegularFile})
|
|
}
|
|
}
|
|
dops := ramfstest.NewDir(ctx, contents, fs.FilePermissions{
|
|
User: fs.PermMask{Read: true, Execute: true},
|
|
})
|
|
return fs.NewInode(&dir{
|
|
InodeOperations: dops,
|
|
negative: negative,
|
|
}, msrc, fs.StableAttr{Type: fs.Directory})
|
|
}
|