05core/*: display Ignition warnings on the console

Fixes coreos/fedora-coreos-tracker#1125

This change displays all Ignition warnings on the console. Also, renamed
the existing Ignition service to make it more generalized for handling
status information about the Ignition run.

overlay.d/05core/usr/lib/systemd/system-preset/40-coreos.preset

@@ -23,5 +23,5 @@ enable bootupd.socket
 # Ideally it should have been added as part of base Fedora - but since it was arch specific, it was not added: https://bugzilla.redhat.com/show_bug.cgi?id=1433859
 enable rtas_errd.service
 enable clevis-luks-askpass.path
-# Provide information if no ignition is provided
-enable coreos-check-ignition-config.service
+# Provide status information about the Ignition run
+enable coreos-ignition-status-info.service

overlay.d/05core/usr/lib/systemd/system/coreos-ignition-status-info.service

@@ -0,0 +1,15 @@
+# This service provides status information about the 
+# Ignition run, which includes Ignition warnings and 
+# information if no Ignition config is provided.
+[Unit]
+Description=Create Ignition Status Issue Files
+Before=systemd-user-sessions.service
+ConditionPathExists=/etc/.ignition-result.json
+
+[Service]
+Type=oneshot
+ExecStart=/usr/libexec/coreos-ignition-status-info
+RemainAfterExit=yes
+
+[Install]
+WantedBy=multi-user.target

overlay.d/05core/usr/libexec/coreos-check-ignition-config → overlay.d/05core/usr/libexec/coreos-ignition-status-info

@@ -42,6 +42,15 @@ else
         >> /run/issue.d/30_coreos_ignition_provisioning.issue
 fi
 
+# This is for displaying Ignition warnings on the console
+# TODO: Find a way to query journald logs before the system switches to real root
+IGNITION_WARNINGS=$(journalctl -t ignition -o json-pretty -b 0 -p warning | jq -r '.MESSAGE')
+if [ -n "${IGNITION_WARNINGS}" ]; then
+    echo "$(while read line; do echo "Ignition: $line"; done <<< ${IGNITION_WARNINGS})" \
+        >> /run/issue.d/30_coreos_ignition_warnings.issue
+fi
+
 # Our makeshift way of getting /run/issue.d semantics. See:
 # https://github.com/coreos/console-login-helper-messages/blob/e06fc88ae8fbcc3a422bc8c686f70c15aebb9d9a/usr/lib/console-login-helper-messages/issue.defs#L8-L17
 ln -sf /run/issue.d/30_coreos_ignition_provisioning.issue /etc/issue.d/
+ln -sf /run/issue.d/30_coreos_ignition_warnings.issue /etc/issue.d/