feat: add MOTD

config/files/usr/libexec/ublue-motd

@@ -0,0 +1,27 @@
+#!/usr/bin/bash
+
+# Modified from https://github.com/ublue-os/bazzite/blob/main/system_files/desktop/shared/usr/libexec/ublue-motd
+escape() {
+	sed 's/[&/\]/\\&/g' <<< "$1"
+}
+
+IMAGE_INFO="/usr/share/ublue-os/image-info.json"
+IMAGE_NAME=$(jq -r '."image-name"' < $IMAGE_INFO)
+IMAGE_NAME_ESCAPED=$(escape "$IMAGE_NAME")
+IMAGE_TAG=$(jq -r '."image-tag"' < $IMAGE_INFO)
+IMAGE_TAG_ESCAPED=$(escape "$IMAGE_TAG")
+TIP=""
+
+IMAGE_DATE=$(rpm-ostree status --booted | sed -n 's/.*Timestamp: \(.*\)/\1/p')
+IMAGE_DATE_SECONDS=$(date -d "$IMAGE_DATE" +%s)
+CURRENT_SECONDS=$(date +%s)
+DIFFERENCE=$((CURRENT_SECONDS - IMAGE_DATE_SECONDS))
+MONTH=$((30 * 24 * 60 * 60))
+if [ "$DIFFERENCE" -ge "$MONTH" ]; then
+    TIP='# 󰇻 Your current image is over 1 month old, run `ujust update`'
+fi
+
+TIP_ESCAPED=$(escape "$TIP")
+
+TIP_OUTPUT=sed -e "s/%IMAGE_NAME%/$IMAGE_NAME_ESCAPED/g" -e "s/%IMAGE_TAG%/$IMAGE_TAG_ESCAPED/g" -e "s/%TIP%/$TIP_ESCAPED/g" /usr/share/ublue-os/motd/secureblue.txt | tr '~' '\n'
+echo $TIP_OUTPUT