105 lines
2.4 KiB
Go
105 lines
2.4 KiB
Go
package snapshot
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import (
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"io/ioutil"
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"os"
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"path/filepath"
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"testing"
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"github.com/docker/containerd"
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"github.com/docker/containerd/snapshot/testutil"
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)
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// TestSnapshotManagerBasic implements something similar to the conceptual
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// examples we've discussed thus far. It does perform mounts, so you must run
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// as root.
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func TestSnapshotManagerBasic(t *testing.T) {
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testutil.RequiresRoot(t)
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tmpDir, err := ioutil.TempDir("", "test-sm-")
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if err != nil {
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t.Fatal(err)
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}
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defer func() {
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t.Log("Removing", tmpDir)
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err := os.RemoveAll(tmpDir)
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if err != nil {
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t.Error(err)
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}
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}()
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root := filepath.Join(tmpDir, "root")
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sm, err := NewManager(root)
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if err != nil {
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t.Fatal(err)
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}
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preparing := filepath.Join(tmpDir, "preparing")
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if err := os.MkdirAll(preparing, 0777); err != nil {
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t.Fatal(err)
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}
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mounts, err := sm.Prepare(preparing, "")
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if err != nil {
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t.Fatal(err)
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}
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if len(mounts) < 1 {
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t.Fatal("expected mounts to have entries")
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}
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if err := containerd.MountAll(mounts, preparing); err != nil {
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t.Fatal(err)
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}
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defer testutil.Unmount(t, preparing)
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if err := ioutil.WriteFile(filepath.Join(preparing, "foo"), []byte("foo\n"), 0777); err != nil {
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t.Fatal(err)
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}
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os.MkdirAll(preparing+"/a/b/c", 0755)
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committed := filepath.Join(sm.root, "committed")
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if err := sm.Commit(committed, preparing); err != nil {
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t.Fatal(err)
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}
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if sm.Parent(preparing) != "" {
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t.Fatalf("parent of new layer should be empty, got sm.Parent(%q) == %q", preparing, sm.Parent(preparing))
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}
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next := filepath.Join(tmpDir, "nextlayer")
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if err := os.MkdirAll(next, 0777); err != nil {
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t.Fatal(err)
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}
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mounts, err = sm.Prepare(next, committed)
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if err != nil {
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t.Fatal(err)
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}
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if err := containerd.MountAll(mounts, next); err != nil {
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t.Fatal(err)
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}
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defer testutil.Unmount(t, next)
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if err := ioutil.WriteFile(filepath.Join(next, "bar"), []byte("bar\n"), 0777); err != nil {
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t.Fatal(err)
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}
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// also, change content of foo to bar
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if err := ioutil.WriteFile(filepath.Join(next, "foo"), []byte("bar\n"), 0777); err != nil {
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t.Fatal(err)
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}
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os.RemoveAll(next + "/a/b")
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nextCommitted := filepath.Join(sm.root, "committed-next")
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if err := sm.Commit(nextCommitted, next); err != nil {
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t.Fatal(err)
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}
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if sm.Parent(nextCommitted) != committed {
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t.Fatalf("parent of new layer should be %q, got sm.Parent(%q) == %q (%#v)", committed, next, sm.Parent(next), sm.parents)
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}
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}
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