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pkg/mount: testing for linux sharedsubtree mounts
* shared * shared/slave * unbindable * private Signed-off-by: Vincent Batts <vbatts@redhat.com>
This commit is contained in:
Vincent Batts
parent
06bd66a1f8
commit
7a3a938712
1 changed files with 331 additions and 0 deletions
331
pkg/mount/sharedsubtree_linux_test.go
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331
pkg/mount/sharedsubtree_linux_test.go
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// +build linux
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package mount
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import (
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"os"
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"path"
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"syscall"
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"testing"
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)
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// nothing is propogated in or out
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func TestSubtreePrivate(t *testing.T) {
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tmp := path.Join(os.TempDir(), "mount-tests")
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if err := os.MkdirAll(tmp, 0777); err != nil {
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t.Fatal(err)
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}
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defer os.RemoveAll(tmp)
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var (
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sourceDir = path.Join(tmp, "source")
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targetDir = path.Join(tmp, "target")
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outside1Dir = path.Join(tmp, "outside1")
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outside2Dir = path.Join(tmp, "outside2")
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outside1Path = path.Join(outside1Dir, "file.txt")
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outside2Path = path.Join(outside2Dir, "file.txt")
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outside1CheckPath = path.Join(targetDir, "a", "file.txt")
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outside2CheckPath = path.Join(sourceDir, "b", "file.txt")
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)
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if err := os.MkdirAll(path.Join(sourceDir, "a"), 0777); err != nil {
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t.Fatal(err)
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}
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if err := os.MkdirAll(path.Join(sourceDir, "b"), 0777); err != nil {
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t.Fatal(err)
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}
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if err := os.Mkdir(targetDir, 0777); err != nil {
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t.Fatal(err)
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}
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if err := os.Mkdir(outside1Dir, 0777); err != nil {
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t.Fatal(err)
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}
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if err := os.Mkdir(outside2Dir, 0777); err != nil {
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t.Fatal(err)
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}
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if err := createFile(outside1Path); err != nil {
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t.Fatal(err)
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}
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if err := createFile(outside2Path); err != nil {
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t.Fatal(err)
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}
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// mount the shared directory to a target
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if err := Mount(sourceDir, targetDir, "none", "bind,rw"); err != nil {
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t.Fatal(err)
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}
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defer func() {
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if err := Unmount(targetDir); err != nil {
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t.Fatal(err)
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}
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}()
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// next, make the target private
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if err := MakePrivate(targetDir); err != nil {
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t.Fatal(err)
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}
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defer func() {
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if err := Unmount(targetDir); err != nil {
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t.Fatal(err)
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}
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}()
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// mount in an outside path to a mounted path inside the _source_
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if err := Mount(outside1Dir, path.Join(sourceDir, "a"), "none", "bind,rw"); err != nil {
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t.Fatal(err)
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}
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defer func() {
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if err := Unmount(path.Join(sourceDir, "a")); err != nil {
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t.Fatal(err)
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}
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}()
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// check that this file _does_not_ show in the _target_
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if _, err := os.Stat(outside1CheckPath); err != nil && !os.IsNotExist(err) {
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t.Fatal(err)
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} else if err == nil {
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t.Fatalf("%q should not be visible, but is", outside1CheckPath)
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}
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// next mount outside2Dir into the _target_
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if err := Mount(outside2Dir, path.Join(targetDir, "b"), "none", "bind,rw"); err != nil {
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t.Fatal(err)
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}
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defer func() {
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if err := Unmount(path.Join(targetDir, "b")); err != nil {
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t.Fatal(err)
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}
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}()
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// check that this file _does_not_ show in the _source_
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if _, err := os.Stat(outside2CheckPath); err != nil && !os.IsNotExist(err) {
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t.Fatal(err)
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} else if err == nil {
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t.Fatalf("%q should not be visible, but is", outside2CheckPath)
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}
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}
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// Testing that when a target is a shared mount,
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// then child mounts propogate to the source
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func TestSubtreeShared(t *testing.T) {
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tmp := path.Join(os.TempDir(), "mount-tests")
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if err := os.MkdirAll(tmp, 0777); err != nil {
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t.Fatal(err)
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}
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defer os.RemoveAll(tmp)
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var (
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sourceDir = path.Join(tmp, "source")
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targetDir = path.Join(tmp, "target")
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outsideDir = path.Join(tmp, "outside")
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outsidePath = path.Join(outsideDir, "file.txt")
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sourceCheckPath = path.Join(sourceDir, "a", "file.txt")
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)
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if err := os.MkdirAll(path.Join(sourceDir, "a"), 0777); err != nil {
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t.Fatal(err)
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}
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if err := os.Mkdir(targetDir, 0777); err != nil {
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t.Fatal(err)
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}
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if err := os.Mkdir(outsideDir, 0777); err != nil {
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t.Fatal(err)
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}
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if err := createFile(outsidePath); err != nil {
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t.Fatal(err)
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}
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// mount the source as shared
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if err := MakeShared(sourceDir); err != nil {
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t.Fatal(err)
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}
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defer func() {
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if err := Unmount(sourceDir); err != nil {
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t.Fatal(err)
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}
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}()
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// mount the shared directory to a target
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if err := Mount(sourceDir, targetDir, "none", "bind,rw"); err != nil {
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t.Fatal(err)
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}
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defer func() {
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if err := Unmount(targetDir); err != nil {
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t.Fatal(err)
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}
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}()
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// mount in an outside path to a mounted path inside the target
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if err := Mount(outsideDir, path.Join(targetDir, "a"), "none", "bind,rw"); err != nil {
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t.Fatal(err)
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}
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defer func() {
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if err := Unmount(path.Join(targetDir, "a")); err != nil {
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t.Fatal(err)
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}
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}()
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// NOW, check that the file from the outside directory is avaible in the source directory
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if _, err := os.Stat(sourceCheckPath); err != nil {
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t.Fatal(err)
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}
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}
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// testing that mounts to a shared source show up in the slave target,
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// and that mounts into a slave target do _not_ show up in the shared source
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func TestSubtreeSharedSlave(t *testing.T) {
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tmp := path.Join(os.TempDir(), "mount-tests")
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if err := os.MkdirAll(tmp, 0777); err != nil {
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t.Fatal(err)
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}
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defer os.RemoveAll(tmp)
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var (
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sourceDir = path.Join(tmp, "source")
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targetDir = path.Join(tmp, "target")
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outside1Dir = path.Join(tmp, "outside1")
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outside2Dir = path.Join(tmp, "outside2")
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outside1Path = path.Join(outside1Dir, "file.txt")
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outside2Path = path.Join(outside2Dir, "file.txt")
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outside1CheckPath = path.Join(targetDir, "a", "file.txt")
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outside2CheckPath = path.Join(sourceDir, "b", "file.txt")
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)
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if err := os.MkdirAll(path.Join(sourceDir, "a"), 0777); err != nil {
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t.Fatal(err)
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}
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if err := os.MkdirAll(path.Join(sourceDir, "b"), 0777); err != nil {
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t.Fatal(err)
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}
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if err := os.Mkdir(targetDir, 0777); err != nil {
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t.Fatal(err)
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}
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if err := os.Mkdir(outside1Dir, 0777); err != nil {
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t.Fatal(err)
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}
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if err := os.Mkdir(outside2Dir, 0777); err != nil {
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t.Fatal(err)
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}
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if err := createFile(outside1Path); err != nil {
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t.Fatal(err)
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}
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if err := createFile(outside2Path); err != nil {
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t.Fatal(err)
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}
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// mount the source as shared
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if err := MakeShared(sourceDir); err != nil {
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t.Fatal(err)
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}
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defer func() {
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if err := Unmount(sourceDir); err != nil {
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t.Fatal(err)
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}
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}()
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// mount the shared directory to a target
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if err := Mount(sourceDir, targetDir, "none", "bind,rw"); err != nil {
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t.Fatal(err)
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}
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defer func() {
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if err := Unmount(targetDir); err != nil {
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t.Fatal(err)
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}
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}()
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// next, make the target slave
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if err := MakeSlave(targetDir); err != nil {
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t.Fatal(err)
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}
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defer func() {
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if err := Unmount(targetDir); err != nil {
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t.Fatal(err)
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}
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}()
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// mount in an outside path to a mounted path inside the _source_
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if err := Mount(outside1Dir, path.Join(sourceDir, "a"), "none", "bind,rw"); err != nil {
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t.Fatal(err)
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}
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defer func() {
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if err := Unmount(path.Join(sourceDir, "a")); err != nil {
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t.Fatal(err)
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}
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}()
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// check that this file _does_ show in the _target_
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if _, err := os.Stat(outside1CheckPath); err != nil {
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t.Fatal(err)
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}
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// next mount outside2Dir into the _target_
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if err := Mount(outside2Dir, path.Join(targetDir, "b"), "none", "bind,rw"); err != nil {
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t.Fatal(err)
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}
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defer func() {
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if err := Unmount(path.Join(targetDir, "b")); err != nil {
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t.Fatal(err)
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}
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}()
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// check that this file _does_not_ show in the _source_
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if _, err := os.Stat(outside2CheckPath); err != nil && !os.IsNotExist(err) {
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t.Fatal(err)
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} else if err == nil {
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t.Fatalf("%q should not be visible, but is", outside2CheckPath)
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}
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}
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func TestSubtreeUnbindable(t *testing.T) {
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tmp := path.Join(os.TempDir(), "mount-tests")
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if err := os.MkdirAll(tmp, 0777); err != nil {
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t.Fatal(err)
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}
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defer os.RemoveAll(tmp)
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var (
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sourceDir = path.Join(tmp, "source")
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targetDir = path.Join(tmp, "target")
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)
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if err := os.MkdirAll(sourceDir, 0777); err != nil {
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t.Fatal(err)
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}
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if err := os.MkdirAll(targetDir, 0777); err != nil {
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t.Fatal(err)
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}
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// next, make the source unbindable
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if err := MakeUnbindable(sourceDir); err != nil {
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t.Fatal(err)
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}
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defer func() {
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if err := Unmount(sourceDir); err != nil {
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t.Fatal(err)
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}
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}()
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// then attempt to mount it to target. It should fail
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if err := Mount(sourceDir, targetDir, "none", "bind,rw"); err != nil && err != syscall.EINVAL {
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t.Fatal(err)
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} else if err == nil {
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t.Fatalf("%q should not have been bindable")
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}
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defer func() {
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if err := Unmount(targetDir); err != nil {
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t.Fatal(err)
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}
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}()
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}
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func createFile(path string) error {
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f, err := os.Create(path)
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if err != nil {
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return err
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}
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f.WriteString("hello world!")
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return f.Close()
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}
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