[ostree] yocto: Don't overwrite target with initial compose

[Colin Walters <walters src gnome org>]

commit 0a428d2bcedf9ffbf7aa52f14b550678d1e7a563
Author: Colin Walters <walters verbum org>
Date:   Sat Feb 18 11:21:17 2012 -0500

    yocto: Don't overwrite target with initial compose
    
    The idea of creating the "initial compose" is it should be just that -
    initial.  If we've later added stuff via ostbuild, we don't want to
    overwrite it.  ostbuild will itself recompose from the base.

 gnomeos/yocto/classes/gnomeos-contents.bbclass |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/gnomeos/yocto/classes/gnomeos-contents.bbclass b/gnomeos/yocto/classes/gnomeos-contents.bbclass
index f51adec..d84d089 100644
--- a/gnomeos/yocto/classes/gnomeos-contents.bbclass
+++ b/gnomeos/yocto/classes/gnomeos-contents.bbclass
@@ -190,7 +190,10 @@ fakeroot do_rootfs () {
         fi
 	ostree --repo=${repo} commit -s "${IMAGE_LINK_NAME}" --skip-if-unchanged "Build" -b ${base} --tree=tar=${DEPLOY_DIR_IMAGE}/${IMAGE_LINK_NAME}.tar.gz
 	ostree --repo=${repo} diff "${base}" || true
-	ostree --repo=${repo} compose -s "Initial compose" -b ${buildroot} ${base}:/
+	# Create the initial root if it doesn't exist
+	if ! ostree --repo=${repo} rev-parse "${buildroot}" 2>/dev/null; then
+	  ostree --repo=${repo} compose -s "Initial compose" -b ${buildroot} ${base}:/
+	fi
 }
 
 log_check() {