find tarballs' difference

service_parser.go

@@ -0,0 +1,27 @@
+package main
+
+import (
+	"bufio"
+	"os"
+	"path/filepath"
+	"regexp"
+)
+
+func parseService(wd string) map[string]struct{} {
+	re := regexp.MustCompile(`path">(.*?)<`)
+	tgz := make(map[string]struct{})
+	service := filepath.Join(wd, "_service")
+	if _, err := os.Stat(service); !os.IsNotExist(err) {
+		f, _ := os.Open(service)
+		scanner := bufio.NewScanner(f)
+		for scanner.Scan() {
+			t := scanner.Text()
+			if re.MatchString(t) {
+				t = re.FindStringSubmatch(t)[1]
+				tgz[filepath.Base(t)] = struct{}{}
+			}
+		}
+		f.Close()
+	}
+	return tgz
+}

tarball.go

@@ -18,6 +18,18 @@ func (tb Tarballs) Append(uri string) {
 	}
 }
 
+func (tb Tarballs) diff(m map[string]struct{}, wd string) {
+	s := "#!/bin/bash\n"
+	for k := range tb {
+		tgz := filepath.Base(k)
+		if _, ok := m[tgz]; !ok {
+			log.Printf("%s should be removed\n", tgz)
+			s += "osc delete " +tgz+"\n"
+		}
+	}
+	ioutil.WriteFile(filepath.Join(wd, "remove.sh"), []byte(s), 0755)
+}
+
 // ToService convert tarball map to _service
 func (tb Tarballs) ToService(wd string) {
 	s := "<services>\n"
@@ -33,6 +45,11 @@ func (tb Tarballs) ToService(wd string) {
 		s += "\t</service>\n"
 	}
 	s += "</services>\n"
+
+	m := parseService(wd)
+	if m != nil {
+		tb.diff(m, wd)
+	}
 	ioutil.WriteFile(filepath.Join(wd, "_service"), []byte(s), 0644)
 }