112 lines
2.6 KiB
Go
112 lines
2.6 KiB
Go
package snapshot
|
|
|
|
import (
|
|
"io/ioutil"
|
|
"os"
|
|
"path/filepath"
|
|
"strings"
|
|
"testing"
|
|
)
|
|
|
|
// TestSnapshotManagerBasic implements something similar to the conceptual
|
|
// examples we've discussed thus far. It does perform mounts, so you must run
|
|
// as root.
|
|
func TestSnapshotManagerBasic(t *testing.T) {
|
|
tmpDir, err := ioutil.TempDir("", "test-layman-")
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
// defer os.RemoveAll(tmpDir)
|
|
|
|
root := filepath.Join(tmpDir, "root")
|
|
|
|
lm, err := NewManager(root)
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
|
|
preparing := filepath.Join(tmpDir, "preparing")
|
|
if err := os.MkdirAll(preparing, 0777); err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
|
|
mounts, err := lm.Prepare(preparing, "")
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
|
|
if len(mounts) < 1 {
|
|
t.Fatal("expected mounts to have entries")
|
|
}
|
|
|
|
for _, mount := range mounts {
|
|
if !strings.HasPrefix(mount.Target, preparing) {
|
|
t.Fatalf("expected mount target to be prefixed with tmpDir: %q does not startwith %q", mount.Target, preparing)
|
|
}
|
|
|
|
t.Log(MountCommand(mount))
|
|
}
|
|
|
|
if err := MountAll(mounts...); err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
|
|
if err := ioutil.WriteFile(filepath.Join(preparing, "foo"), []byte("foo\n"), 0777); err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
|
|
os.MkdirAll(preparing+"/a/b/c", 0755)
|
|
|
|
// defer os.Remove(filepath.Join(tmpDir, "foo"))
|
|
|
|
committed := filepath.Join(lm.root, "committed")
|
|
|
|
if err := lm.Commit(committed, preparing); err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
|
|
if lm.Parent(preparing) != "" {
|
|
t.Fatalf("parent of new layer should be empty, got lm.Parent(%q) == %q", preparing, lm.Parent(preparing))
|
|
}
|
|
|
|
next := filepath.Join(tmpDir, "nextlayer")
|
|
if err := os.MkdirAll(next, 0777); err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
|
|
mounts, err = lm.Prepare(next, committed)
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
if err := MountAll(mounts...); err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
|
|
for _, mount := range mounts {
|
|
if !strings.HasPrefix(mount.Target, next) {
|
|
t.Fatalf("expected mount target to be prefixed with tmpDir: %q does not startwith %q", mount.Target, next)
|
|
}
|
|
|
|
t.Log(MountCommand(mount))
|
|
}
|
|
|
|
if err := ioutil.WriteFile(filepath.Join(next, "bar"), []byte("bar\n"), 0777); err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
|
|
// also, change content of foo to bar
|
|
if err := ioutil.WriteFile(filepath.Join(next, "foo"), []byte("bar\n"), 0777); err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
|
|
os.RemoveAll(next + "/a/b")
|
|
nextCommitted := filepath.Join(lm.root, "committed-next")
|
|
if err := lm.Commit(nextCommitted, next); err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
|
|
if lm.Parent(nextCommitted) != committed {
|
|
t.Fatalf("parent of new layer should be %q, got lm.Parent(%q) == %q (%#v)", committed, next, lm.Parent(next), lm.parents)
|
|
}
|
|
}
|