Script to verify Pi-hole version

app/check.pihole.update

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+#!/bin/sh
+# Purpose {{{
+## Create a temp file (to monitor) if an upgrade is available for Pi-hole
+## from official repository − https://github.com/pi-hole/pi-hole
+## It's based on the pihole binary to check versions.
+## How-to use {{{
+### 1. Create a cron job, eg :
+#00 20 * * * root /opt/repos/ipr.scripts/app/check.pihole.update
+### 2-1 Create a cron job to compare the version available in an APT repository :
+#00 20 * * * root /opt/repos/ipr.scripts/app/check.pihole.update repo
+### 2. Monitor the temp file : /tmp/.pihole.upgrade
+# Or enable MAILTO in cronjob and edit the script to print a message.
+# Or send a mail.
+# …
+## }}}
+# }}}
+
+# Expect maximum 1 argument {{{
+if [ $# -gt 1 ]
+then
+	cat << HELP
+
+check.pihole.update    --
+Compare current version of an installed Pi-hole and the last available.
+
+EXAMPLE :
+    - Compare the current version from pihole binary informations.
+        check.pihole.update
+
+HELP
+
+	exit 1
+fi
+# }}}
+
+# Vars {{{
+DEBUG=1
+
+pihole_current_status=$(pihole updatePihole --check-only)
+
+pihole_new_version_file="/tmp/.pihole.upgrade"
+# }}}
+
+# Check the current status with pihole subcommand {{{
+if printf -- '%s' "${pihole_current_status}" | grep -q -- "Everything is ERROR date"; then
+	[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6s\e[m\n' "DEBUG : Pi-hole seems up to date."
+	## Ensure to remove any temp file
+	rm --force -- "${pihole_new_version_file}"
+else
+	[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6s\e[m\n' "DEBUG : An update seems available for Pi-hole."
+	## Create a temp file to monitor
+	touch -- "${pihole_new_version_file}"
+	printf '\e[1;35m%-6s\e[m\n' "An upgrade is available for Pi-hole, result of 'pihole updatePihole --check-only' command :" >> "${pihole_new_version_file}"
+	pihole updatePihole --check-only >> "${pihole_new_version_file}"
+fi
+# }}}
+
+exit 0