distribution/registry/storage/walk_test.go

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package storage
import (
"context"
"fmt"
"sort"
"testing"
"github.com/docker/distribution/registry/storage/driver"
"github.com/docker/distribution/registry/storage/driver/inmemory"
)
func testFS(t *testing.T) (driver.StorageDriver, map[string]string, context.Context) {
d := inmemory.New()
ctx := context.Background()
expected := map[string]string{
"/a": "dir",
"/a/b": "dir",
"/a/b/c": "dir",
"/a/b/c/d": "file",
"/a/b/c/e": "file",
"/a/b/f": "dir",
"/a/b/f/g": "file",
"/a/b/f/h": "file",
"/a/b/f/i": "file",
"/z": "dir",
"/z/y": "file",
}
for p, typ := range expected {
if typ != "file" {
continue
}
if err := d.PutContent(ctx, p, []byte(p)); err != nil {
t.Fatalf("unable to put content into fixture: %v", err)
}
}
return d, expected, ctx
}
func TestWalkErrors(t *testing.T) {
d, expected, ctx := testFS(t)
fileCount := len(expected)
err := Walk(ctx, d, "", func(fileInfo driver.FileInfo) error {
return nil
})
if err == nil {
t.Error("Expected invalid root err")
}
errEarlyExpected := fmt.Errorf("Early termination")
err = Walk(ctx, d, "/", func(fileInfo driver.FileInfo) error {
// error on the 2nd file
if fileInfo.Path() == "/a/b" {
return errEarlyExpected
}
delete(expected, fileInfo.Path())
return nil
})
if len(expected) != fileCount-1 {
t.Error("Walk failed to terminate with error")
}
if err != errEarlyExpected {
if err == nil {
t.Fatalf("expected an error due to early termination")
} else {
t.Error(err.Error())
}
}
err = Walk(ctx, d, "/nonexistent", func(fileInfo driver.FileInfo) error {
return nil
})
if err == nil {
t.Errorf("Expected missing file err")
}
}
func TestWalk(t *testing.T) {
d, expected, ctx := testFS(t)
var traversed []string
err := Walk(ctx, d, "/", func(fileInfo driver.FileInfo) error {
filePath := fileInfo.Path()
filetype, ok := expected[filePath]
if !ok {
t.Fatalf("Unexpected file in walk: %q", filePath)
}
if fileInfo.IsDir() {
if filetype != "dir" {
t.Errorf("Unexpected file type: %q", filePath)
}
} else {
if filetype != "file" {
t.Errorf("Unexpected file type: %q", filePath)
}
// each file has its own path as the contents. If the length
// doesn't match the path length, fail.
if fileInfo.Size() != int64(len(fileInfo.Path())) {
t.Fatalf("unexpected size for %q: %v != %v",
fileInfo.Path(), fileInfo.Size(), len(fileInfo.Path()))
}
}
delete(expected, filePath)
traversed = append(traversed, filePath)
return nil
})
if len(expected) > 0 {
t.Errorf("Missed files in walk: %q", expected)
}
if !sort.StringsAreSorted(traversed) {
t.Errorf("result should be sorted: %v", traversed)
}
if err != nil {
t.Fatalf(err.Error())
}
}
func TestWalkSkipDir(t *testing.T) {
d, expected, ctx := testFS(t)
err := Walk(ctx, d, "/", func(fileInfo driver.FileInfo) error {
filePath := fileInfo.Path()
if filePath == "/a/b" {
// skip processing /a/b/c and /a/b/c/d
return ErrSkipDir
}
delete(expected, filePath)
return nil
})
if err != nil {
t.Fatalf(err.Error())
}
if _, ok := expected["/a/b/c"]; !ok {
t.Errorf("/a/b/c not skipped")
}
if _, ok := expected["/a/b/c/d"]; !ok {
t.Errorf("/a/b/c/d not skipped")
}
if _, ok := expected["/a/b/c/e"]; !ok {
t.Errorf("/a/b/c/e not skipped")
}
}