Cirrus: Disable most periodic services/timers

For CI testing, it's important to remove as much variability from the
overall system as possible.  This permits focusing just on problems
closely related to code-changes.  To this end, and because VMs are very
short-lived (2 hours at most), disable all systemd services and timers
which perform periodic activities.

Signed-off-by: Chris Evich <cevich@redhat.com>

contrib/cirrus/lib.sh

@@ -350,6 +350,20 @@ remove_packaged_podman_files(){
     done
 }
 
+systemd_banish(){
+    echo "Disabling periodic services that could destabalize testing:"
+    set +e  # Not all of these exist on every platform
+    for unit in cron atd apt-daily-upgrade apt-daily fstrim motd-news systemd-tmpfiles-clean
+    do
+        ooe.sh sudo systemctl stop $unit
+        ooe.sh sudo systemctl disable $unit
+        ooe.sh sudo systemctl disable $unit.timer
+        ooe.sh sudo systemctl mask $unit
+        ooe.sh sudo systemctl mask $unit.timer
+    done
+    set -e
+}
+
 _finalize(){
     set +e  # Don't fail at the very end
     set +e  # make errors non-fatal

contrib/cirrus/packer/fedora_base-setup.sh

@@ -27,6 +27,9 @@ ooe.sh systemctl enable rngd
 echo "Setting cloud-init service to start after google-network-daemon.service"
 cp -v $GOSRC/$PACKER_BASE/cloud-init/fedora/cloud-init.service /etc/systemd/system/
 
+# Ensure there are no disruptive periodic services enabled by default in image
+systemd_banish
+
 rh_finalize
 
 echo "SUCCESS!"

contrib/cirrus/packer/fedora_setup.sh

@@ -76,6 +76,9 @@ ooe.sh sudo dnf install -y \
     xz \
     zip
 
+# Ensure there are no disruptive periodic services enabled by default in image
+systemd_banish
+
 sudo /tmp/libpod/hack/install_catatonit.sh
 
 rh_finalize

contrib/cirrus/packer/ubuntu_setup.sh

@@ -100,6 +100,9 @@ ooe.sh sudo update-grub
 sudo /tmp/libpod/hack/install_catatonit.sh
 ooe.sh sudo make -C /tmp/libpod install.libseccomp.sudo
 
+# Ensure there are no disruptive periodic services enabled by default in image
+systemd_banish
+
 ubuntu_finalize
 
 echo "SUCCESS!"