diff --git a/sbin/build_image b/sbin/build_image
index d15c86b..e086d5f 100755
--- a/sbin/build_image
+++ b/sbin/build_image
@@ -131,6 +131,7 @@ fi
 if [ -f "$IMAGE_NAME_RISOTTO_IMAGE_DIR".base.pkgs ] && [ -f "$IMAGE_NAME_RISOTTO_IMAGE_DIR".pkgs ]; then
     echo "  - différence(s) avec les paquets de base"
     diff -u "$IMAGE_NAME_RISOTTO_IMAGE_DIR".base.pkgs "$BASE_PKGS_FILE" && INSTALL=false || INSTALL=true
+    [ ! -f "$IMAGE_NAME_RISOTTO_IMAGE_NAME" ] && INSTALL=true
 else
     INSTALL=true
 fi
diff --git a/sbin/update_images b/sbin/update_images
index c2e250c..e260f64 100644
--- a/sbin/update_images
+++ b/sbin/update_images
@@ -15,7 +15,7 @@ ls /var/lib/risotto/images_files/ | while read image; do
         /usr/local/sbin/build_image "$image"
     fi
 done
-rm -f $IMAGE_BASE_RISOTTO_BASE_DIR*.build
+#rm -f $IMAGE_BASE_RISOTTO_BASE_DIR*.build
 
 MACHINES=""
 for nspawn in $(ls /etc/systemd/nspawn/*.nspawn); do
@@ -23,11 +23,11 @@ for nspawn in $(ls /etc/systemd/nspawn/*.nspawn); do
     machine=${nspawn_file%.*}
     MACHINES="$MACHINES$machine "
     MACHINE_MACHINES_DIR="/var/lib/machines/$machine"
-    echo "Install machine $machine"
     SHA_MACHINE="$RISOTTO_DIR/configurations/sha/$machine".sha
     content=$(cat $SHA_MACHINE)
     IMAGE_NAME_RISOTTO_IMAGE_NAME=${content##* }
-    diff -q "$IMAGE_NAME_RISOTTO_IMAGE_NAME".sha "$SHA_MACHINE" || (
+    diff -q "$IMAGE_NAME_RISOTTO_IMAGE_NAME".sha "$SHA_MACHINE" > /dev/null || (
+        echo "Reinstall machine $machine"
         machinectl stop $machine
         while true; do
             machinectl status "$machine" > /dev/null 2>&1 || break
@@ -41,39 +41,4 @@ for nspawn in $(ls /etc/systemd/nspawn/*.nspawn); do
     )
 done
 machinectl start $MACHINES
-STARTED=""
-DEGRADED=""
-found=true
-idx=0
-while [ $found = true ]; do
-    found=false
-    echo "tentative $idx"
-    for machine in $MACHINES; do
-        if ! echo $STARTED | grep -q " $machine "; then
-            status=$(machinectl -q shell $machine /usr/bin/systemctl is-system-running || true)
-            if echo "$status" | grep -q degraded; then
-                STARTED="$STARTED $machine "
-                DEGRADED="$DEGRADED $machine"
-            elif echo "$status" | grep -q running; then
-                STARTED="$STARTED $machine "
-            else
-                found=true
-                echo "status actuel de $machine : $status"
-            fi
-        fi
-    done
-    sleep 2
-    idx=$((idx+1))
-    if [ $idx = 60 ]; then
-        break
-    fi
-done
-retcode=0
-for machine in $DEGRADED; do
-    echo
-    echo "========= $machine"
-    machinectl -q shell $machine /usr/bin/systemctl --state=failed --no-legend --no-pager
-    retcode=1
-done
-
-exit $retcode
+diagnose