[systemstatus] Show (estimate) of last time updates were installed

Plus other minor tweaks, like message on main page.

1 files changed, 38 insertions, 0 deletions

diff --git a/modules-available/systemstatus/inc/systemstatus.inc.php b/modules-available/systemstatus/inc/systemstatus.inc.php
index 36b4ef36..85f0410b 100644
--- a/modules-available/systemstatus/inc/systemstatus.inc.php
+++ b/modules-available/systemstatus/inc/systemstatus.inc.php
@@ -57,4 +57,42 @@ class SystemStatus
 		return true;
 	}
 
+	/**
+	 * Get timestamp of the available updates. This is an estimate, the downloaded apt data usually
+	 * preserves the Last-Modified timestamp from the HTTP download or the according data. Note
+	 * that this list gets updated whener any available package changes, so it does not necessarily
+	 * mean that any currently installed package can be updated when the list changes.
+	 */
+	public static function getAptLastDbUpdateTime(): int
+	{
+		$osRelease = parse_ini_file('/etc/os-release');
+		$updateDbTime = 0;
+		foreach (glob('/var/lib/apt/lists/*_dists_' . ($osRelease['VERSION_CODENAME'] ?? '') . '*_InRelease', GLOB_NOSORT) as $f) {
+			$b = basename($f);
+			if (preg_match('/dists_[a-z]+(?:[\-_]updates)?_InRelease$/', $b)) {
+				$updateDbTime = max($updateDbTime, filemtime($f));
+			}
+		}
+		return $updateDbTime;
+	}
+
+	/**
+	 * Get timestamp when the apt database was last attempted to be updated. This does not
+	 * imply that the operation was successful.
+	 */
+	public static function getAptLastUpdateAttemptTime(): int
+	{
+		return (int)filemtime('/var/lib/apt/lists/partial');
+	}
+
+	/**
+	 * Get when the dpkg database was last changed, i.e. when a package was last installed, updated or removed.
+	 * This is an estimate as it just looks at the modification time of relevant files. It is possible these
+	 * files get modified for other reasons.
+	 */
+	public static function getDpkgLastPackageChanges(): int
+	{
+		return (int)filemtime(file_exists('/var/log/dpkg.log') ? '/var/log/dpkg.log' : '/var/lib/dpkg/status');
+	}
+
 }
\ No newline at end of file