distr_info: improve checking for default package manager

bin/distr_info

@@ -100,7 +100,7 @@ case $DISTRIB_ID in
 	PCLinux)
 		CMD="apt-rpm"
 		;;
-	Ubuntu|Debian|Mint|AstraLinux*|Elbrus)
+	Ubuntu|Debian|Mint|OSNovaLinux|AstraLinux*|Elbrus)
 		CMD="apt-dpkg"
 		#which aptitude 2>/dev/null >/dev/null && CMD=aptitude-dpkg
 		#hascommand snappy && CMD=snappy
@@ -168,17 +168,23 @@ case $DISTRIB_ID in
 		;;
 	*)
 		# try detect firstly
-		if hascommand "rpm" ; then
+		if grep -q "ID_LIKE=debian" /etc/os-release 2>/dev/null ; then
+			echo "apt-dpkg" && return
+		fi
+
+		if hascommand "rpm" && [ -s /var/lib/rpm/Name ] ; then
 			hascommand "zypper" && echo "zypper-rpm" && return
-			hascommand "apt-get" && echo "apt-rpm" && return
 			hascommand "dnf" && echo "dnf-rpm" && return
+			hascommand "apt-get" && echo "apt-rpm" && return
 			hascommand "yum" && echo "yum-rpm" && return
 			hascommand "urpmi" && echo "urpmi-rpm" && return
 		fi
-		if hascommand "dpkg" ; then
+
+		if hascommand "dpkg" && [ -s /var/lib/dpkg/status ] ; then
 			hascommand "apt" && echo "apt-dpkg" && return
 			hascommand "apt-get" && echo "apt-dpkg" && return
 		fi
+
 		echo "We don't support yet DISTRIB_ID $DISTRIB_ID" >&2
 		;;
 esac