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moby--moby/pkg/archive/changes_posix_test.go
Daniel Nephin 4f0d95fa6e Add canonical import comment
Signed-off-by: Daniel Nephin <dnephin@docker.com>
2018-02-05 16:51:57 -05:00

127 lines
2.9 KiB
Go

package archive // import "github.com/docker/docker/pkg/archive"
import (
"archive/tar"
"fmt"
"io"
"io/ioutil"
"os"
"path"
"sort"
"testing"
)
func TestHardLinkOrder(t *testing.T) {
names := []string{"file1.txt", "file2.txt", "file3.txt"}
msg := []byte("Hey y'all")
// Create dir
src, err := ioutil.TempDir("", "docker-hardlink-test-src-")
if err != nil {
t.Fatal(err)
}
defer os.RemoveAll(src)
for _, name := range names {
func() {
fh, err := os.Create(path.Join(src, name))
if err != nil {
t.Fatal(err)
}
defer fh.Close()
if _, err = fh.Write(msg); err != nil {
t.Fatal(err)
}
}()
}
// Create dest, with changes that includes hardlinks
dest, err := ioutil.TempDir("", "docker-hardlink-test-dest-")
if err != nil {
t.Fatal(err)
}
os.RemoveAll(dest) // we just want the name, at first
if err := copyDir(src, dest); err != nil {
t.Fatal(err)
}
defer os.RemoveAll(dest)
for _, name := range names {
for i := 0; i < 5; i++ {
if err := os.Link(path.Join(dest, name), path.Join(dest, fmt.Sprintf("%s.link%d", name, i))); err != nil {
t.Fatal(err)
}
}
}
// get changes
changes, err := ChangesDirs(dest, src)
if err != nil {
t.Fatal(err)
}
// sort
sort.Sort(changesByPath(changes))
// ExportChanges
ar, err := ExportChanges(dest, changes, nil, nil)
if err != nil {
t.Fatal(err)
}
hdrs, err := walkHeaders(ar)
if err != nil {
t.Fatal(err)
}
// reverse sort
sort.Sort(sort.Reverse(changesByPath(changes)))
// ExportChanges
arRev, err := ExportChanges(dest, changes, nil, nil)
if err != nil {
t.Fatal(err)
}
hdrsRev, err := walkHeaders(arRev)
if err != nil {
t.Fatal(err)
}
// line up the two sets
sort.Sort(tarHeaders(hdrs))
sort.Sort(tarHeaders(hdrsRev))
// compare Size and LinkName
for i := range hdrs {
if hdrs[i].Name != hdrsRev[i].Name {
t.Errorf("headers - expected name %q; but got %q", hdrs[i].Name, hdrsRev[i].Name)
}
if hdrs[i].Size != hdrsRev[i].Size {
t.Errorf("headers - %q expected size %d; but got %d", hdrs[i].Name, hdrs[i].Size, hdrsRev[i].Size)
}
if hdrs[i].Typeflag != hdrsRev[i].Typeflag {
t.Errorf("headers - %q expected type %d; but got %d", hdrs[i].Name, hdrs[i].Typeflag, hdrsRev[i].Typeflag)
}
if hdrs[i].Linkname != hdrsRev[i].Linkname {
t.Errorf("headers - %q expected linkname %q; but got %q", hdrs[i].Name, hdrs[i].Linkname, hdrsRev[i].Linkname)
}
}
}
type tarHeaders []tar.Header
func (th tarHeaders) Len() int { return len(th) }
func (th tarHeaders) Swap(i, j int) { th[j], th[i] = th[i], th[j] }
func (th tarHeaders) Less(i, j int) bool { return th[i].Name < th[j].Name }
func walkHeaders(r io.Reader) ([]tar.Header, error) {
t := tar.NewReader(r)
headers := []tar.Header{}
for {
hdr, err := t.Next()
if err != nil {
if err == io.EOF {
break
}
return headers, err
}
headers = append(headers, *hdr)
}
return headers, nil
}