github.com/vvnotw/moby@v1.13.1/daemon/links_linux_test.go (about)

     1  package daemon
     2  
     3  import (
     4  	"encoding/json"
     5  	"io/ioutil"
     6  	"os"
     7  	"path"
     8  	"path/filepath"
     9  	"testing"
    10  
    11  	containertypes "github.com/docker/docker/api/types/container"
    12  	"github.com/docker/docker/container"
    13  	"github.com/docker/docker/pkg/graphdb"
    14  	"github.com/docker/docker/pkg/stringid"
    15  )
    16  
    17  func TestMigrateLegacySqliteLinks(t *testing.T) {
    18  	tmpDir, err := ioutil.TempDir("", "legacy-qlite-links-test")
    19  	if err != nil {
    20  		t.Fatal(err)
    21  	}
    22  	defer os.RemoveAll(tmpDir)
    23  
    24  	name1 := "test1"
    25  	c1 := &container.Container{
    26  		CommonContainer: container.CommonContainer{
    27  			ID:         stringid.GenerateNonCryptoID(),
    28  			Name:       name1,
    29  			HostConfig: &containertypes.HostConfig{},
    30  		},
    31  	}
    32  	c1.Root = tmpDir
    33  
    34  	name2 := "test2"
    35  	c2 := &container.Container{
    36  		CommonContainer: container.CommonContainer{
    37  			ID:   stringid.GenerateNonCryptoID(),
    38  			Name: name2,
    39  		},
    40  	}
    41  
    42  	store := container.NewMemoryStore()
    43  	store.Add(c1.ID, c1)
    44  	store.Add(c2.ID, c2)
    45  
    46  	d := &Daemon{root: tmpDir, containers: store}
    47  	db, err := graphdb.NewSqliteConn(filepath.Join(d.root, "linkgraph.db"))
    48  	if err != nil {
    49  		t.Fatal(err)
    50  	}
    51  
    52  	if _, err := db.Set("/"+name1, c1.ID); err != nil {
    53  		t.Fatal(err)
    54  	}
    55  
    56  	if _, err := db.Set("/"+name2, c2.ID); err != nil {
    57  		t.Fatal(err)
    58  	}
    59  
    60  	alias := "hello"
    61  	if _, err := db.Set(path.Join(c1.Name, alias), c2.ID); err != nil {
    62  		t.Fatal(err)
    63  	}
    64  
    65  	if err := d.migrateLegacySqliteLinks(db, c1); err != nil {
    66  		t.Fatal(err)
    67  	}
    68  
    69  	if len(c1.HostConfig.Links) != 1 {
    70  		t.Fatal("expected links to be populated but is empty")
    71  	}
    72  
    73  	expected := name2 + ":" + alias
    74  	actual := c1.HostConfig.Links[0]
    75  	if actual != expected {
    76  		t.Fatalf("got wrong link value, expected: %q, got: %q", expected, actual)
    77  	}
    78  
    79  	// ensure this is persisted
    80  	b, err := ioutil.ReadFile(filepath.Join(c1.Root, "hostconfig.json"))
    81  	if err != nil {
    82  		t.Fatal(err)
    83  	}
    84  	type hc struct {
    85  		Links []string
    86  	}
    87  	var cfg hc
    88  	if err := json.Unmarshal(b, &cfg); err != nil {
    89  		t.Fatal(err)
    90  	}
    91  
    92  	if len(cfg.Links) != 1 {
    93  		t.Fatalf("expected one entry in links, got: %d", len(cfg.Links))
    94  	}
    95  	if cfg.Links[0] != expected { // same expected as above
    96  		t.Fatalf("got wrong link value, expected: %q, got: %q", expected, cfg.Links[0])
    97  	}
    98  }