diff --git a/_service b/_service
index 8772251..33af1d4 100644
--- a/_service
+++ b/_service
@@ -1,5 +1,5 @@
 <services>
-  <service name="tar_scm" mode="disabled">
+  <service name="obs_scm" mode="disabled">
     <param name="url">https://github.com/prometheus/promu.git</param>
     <param name="scm">git</param>
     <param name="exclude">.git</param>
@@ -8,7 +8,8 @@
     <param name="versionrewrite-pattern">v(.*)</param>
     <param name="changesgenerate">enable</param>
   </service>
-  <service name="recompress" mode="disabled">
+  <service name="tar" mode="buildtime"/>
+  <service name="recompress" mode="buildtime">
     <param name="file">*.tar</param>
     <param name="compression">gz</param>
   </service>
@@ -16,6 +17,6 @@
     <param name="basename">promu</param>
   </service>
   <service name="go_modules" mode="disabled">
-    <param name="archive">promu-0.14.0.tar.gz</param>
+    <param name="archive">promu-0.14.0.obscpio</param>
   </service>
 </services>
diff --git a/golang-github-prometheus-promu.changes b/golang-github-prometheus-promu.changes
index 885ef46..c78bd8e 100644
--- a/golang-github-prometheus-promu.changes
+++ b/golang-github-prometheus-promu.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Wed Mar 22 10:28:44 UTC 2023 - Johannes Kastl <kastl@b1-systems.de>
+
+- rework spec file to use obscpio
+  - run tar and recompresss services at buildtime
+
 -------------------------------------------------------------------
 Tue Jan 10 16:18:52 UTC 2023 - kastl@b1-systems.de
 
diff --git a/promu-0.14.0.obscpio b/promu-0.14.0.obscpio
new file mode 100644
index 0000000..47c97c8
--- /dev/null
+++ b/promu-0.14.0.obscpio
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:1d0f2cc4b075cb4ce9799ed0000c679142107978fe4e9d6c5354827bb66476b7
+size 167435
diff --git a/promu-0.14.0.tar.gz b/promu-0.14.0.tar.gz
deleted file mode 100644
index 91cfbaa..0000000
--- a/promu-0.14.0.tar.gz
+++ /dev/null
@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:e98bfe046101b2b1f2faf2e641f20bbadf5d4eb0780c2d637b56fc5472202fa7
-size 47594
diff --git a/promu.obsinfo b/promu.obsinfo
new file mode 100644
index 0000000..7b3b1b5
--- /dev/null
+++ b/promu.obsinfo
@@ -0,0 +1,4 @@
+name: promu
+version: 0.14.0
+mtime: 1670608623
+commit: a880d9756ae466605040585bc3b15005b55cc9f6