*: have gomtree always evaluate tar_time if it is present

if the keyword "tar_time" is present when evaluating
an Entry, gomtree should use the tar_time when evaluating
the "time" keyword as well. This commit also adds a test that
makes sure "tar_time" wins against "time" if both are present.
Some minor clean-ups as well, such as checking if KeywordFunc[keyword]
actually retrieves a function.

Signed-off-by: Stephen Chung <schung@redhat.com>

check.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"os"
 	"sort"
+	"strings"
 )
 
 // Result of a Check
@@ -65,7 +66,15 @@ func Check(root string, dh *DirectoryHierarchy, keywords []string) (*Result, err
 			}
 
 			for _, kv := range kvs {
-				keywordFunc, ok := KeywordFuncs[kv.Keyword()]
+				kw := kv.Keyword()
+				// 'tar_time' keyword evaluation wins against 'time' keyword evaluation
+				if kv.Keyword() == "time" && inSlice("tar_time", keywords) {
+					kw = "tar_time"
+					tartime := fmt.Sprintf("%s.%s", (strings.Split(kv.Value(), ".")[0]), "000000000")
+					kv = KeyVal(KeyVal(kw).ChangeValue(tartime))
+				}
+
+				keywordFunc, ok := KeywordFuncs[kw]
 				if !ok {
 					return nil, fmt.Errorf("Unknown keyword %q for file %q", kv.Keyword(), e.Path())
 				}

check_test.go

@@ -143,6 +143,58 @@ func TestTimeComparison(t *testing.T) {
 	}
 }
 
+func TestTarTime(t *testing.T) {
+	dir, err := ioutil.TempDir("", "test-tar-time.")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(dir)
+
+	// This is the format of time from FreeBSD
+	spec := `
+/set type=file time=5.454353132
+.               type=dir time=5.123456789
+    file       time=5.911134111
+..
+`
+
+	fh, err := os.Create(filepath.Join(dir, "file"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	// This is what mode we're checking for. Round integer of epoch seconds
+	epoch := time.Unix(5, 0)
+	if err := os.Chtimes(fh.Name(), epoch, epoch); err != nil {
+		t.Fatal(err)
+	}
+	if err := os.Chtimes(dir, epoch, epoch); err != nil {
+		t.Fatal(err)
+	}
+	if err := fh.Close(); err != nil {
+		t.Error(err)
+	}
+
+	dh, err := ParseSpec(bytes.NewBufferString(spec))
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// make sure "time" keyword works
+	_, err = Check(dir, dh, DefaultKeywords)
+	if err != nil {
+		t.Error(err)
+	}
+
+	// make sure tar_time wins
+	res, err := Check(dir, dh, append(DefaultKeywords, "tar_time"))
+	if err != nil {
+		t.Error(err)
+	}
+	if len(res.Failures) > 0 {
+		t.Fatal(res.Failures)
+	}
+}
+
 func TestIgnoreComments(t *testing.T) {
 	dir, err := ioutil.TempDir("", "test-comments.")
 	if err != nil {

cmd/gomtree/main.go

@@ -54,7 +54,11 @@ func main() {
 			currentKeywords = append([]string{"type"}, currentKeywords...)
 		}
 	} else {
-		currentKeywords = mtree.DefaultKeywords[:]
+		if *flTar != "" {
+			currentKeywords = mtree.DefaultTarKeywords[:]
+		} else {
+			currentKeywords = mtree.DefaultKeywords[:]
+		}
 	}
 	// -K <keywords>
 	if *flAddKeywords != "" {

keywords.go

@@ -59,6 +59,11 @@ func (kv KeyVal) Value() string {
 	return strings.SplitN(strings.TrimSpace(string(kv)), "=", 2)[1]
 }
 
+// ChangeValue changes the value of a KeyVal
+func (kv KeyVal) ChangeValue(newval string) string {
+	return fmt.Sprintf("%s=%s", kv.Keyword(), newval)
+}
+
 // keywordSelector takes an array of "keyword=value" and filters out that only the set of words
 func keywordSelector(keyval, words []string) []string {
 	retList := []string{}
@@ -129,6 +134,17 @@ var (
 		"nlink",
 		"time",
 	}
+	// DefaultTarKeywords has keywords that should be used when creating a manifest from
+	// an archive. Currently, evaluating the # of hardlinks has not been implemented yet
+	DefaultTarKeywords = []string{
+		"size",
+		"type",
+		"uid",
+		"gid",
+		"mode",
+		"link",
+		"tar_time",
+	}
 	// SetKeywords is the default set of keywords calculated for a `/set` SpecialType
 	SetKeywords = []string{
 		"uid",
@@ -213,11 +229,7 @@ var (
 		}
 	}
 	tartimeKeywordFunc = func(path string, info os.FileInfo, r io.Reader) (string, error) {
-		t := info.ModTime().Unix()
-		if t == 0 {
-			return "tar_time=0.000000000", nil
-		}
-		return fmt.Sprintf("tar_time=%d.000000000", t), nil
+		return fmt.Sprintf("tar_time=%d.000000000", info.ModTime().Unix()), nil
 	}
 	timeKeywordFunc = func(path string, info os.FileInfo, r io.Reader) (string, error) {
 		t := info.ModTime().UnixNano()

tar_test.go

@@ -3,7 +3,6 @@ package mtree
 import (
 	"archive/tar"
 	"bytes"
-	"fmt"
 	"io"
 	"io/ioutil"
 	"os"
@@ -115,17 +114,17 @@ func TestTar(t *testing.T) {
 		switch {
 		case len(res.Failures) > 0:
 			for _, f := range res.Failures {
-				fmt.Printf("%s\n", f)
+				t.Errorf("%s\n", f)
 			}
 			errors += "Keyword validation errors\n"
 		case len(res.Missing) > 0:
 			for _, m := range res.Missing {
-				fmt.Printf("Missing file: %s\n", m.Path())
+				t.Errorf("Missing file: %s\n", m.Path())
 			}
 			errors += "Missing files not expected for this test\n"
 		case len(res.Extra) > 0:
 			for _, e := range res.Extra {
-				fmt.Printf("Extra file: %s\n", e.Path())
+				t.Errorf("Extra file: %s\n", e.Path())
 			}
 			errors += "Extra files not expected for this test\n"
 		}

walk.go

@@ -80,7 +80,11 @@ func Walk(root string, exlcudes []ExcludeFunc, keywords []string) (*DirectoryHie
 							defer fh.Close()
 							r = fh
 						}
-						if str, err := KeywordFuncs[keyword](path, info, r); err == nil && str != "" {
+						keywordFunc, ok := KeywordFuncs[keyword]
+						if !ok {
+							return fmt.Errorf("Unknown keyword %q for file %q", keyword, path)
+						}
+						if str, err := keywordFunc(path, info, r); err == nil && str != "" {
 							e.Keywords = append(e.Keywords, str)
 						} else if err != nil {
 							return err
@@ -107,7 +111,11 @@ func Walk(root string, exlcudes []ExcludeFunc, keywords []string) (*DirectoryHie
 							defer fh.Close()
 							r = fh
 						}
-						str, err := KeywordFuncs[keyword](path, info, r)
+						keywordFunc, ok := KeywordFuncs[keyword]
+						if !ok {
+							return fmt.Errorf("Unknown keyword %q for file %q", keyword, path)
+						}
+						str, err := keywordFunc(path, info, r)
 						if err != nil {
 							return err
 						}
@@ -158,7 +166,11 @@ func Walk(root string, exlcudes []ExcludeFunc, keywords []string) (*DirectoryHie
 					defer fh.Close()
 					r = fh
 				}
-				str, err := KeywordFuncs[keyword](path, info, r)
+				keywordFunc, ok := KeywordFuncs[keyword]
+				if !ok {
+					return fmt.Errorf("Unknown keyword %q for file %q", keyword, path)
+				}
+				str, err := keywordFunc(path, info, r)
 				if err != nil {
 					return err
 				}