distr_info: add RockyLinux support

bin/distr_info

@@ -365,6 +365,11 @@ normalize_version3()
     echo "$1" | sed -e "s|^\([^.][^.]*\.[^.][^.]*\.[^.][^.]*\)\..*|\1|"
 }
 
+is_numeric()
+{
+    echo "$1" | grep -q "^[0-9][0-9]*$"
+}
+
 
 fill_distr_info()
 {
@@ -394,11 +399,17 @@ if distro os-release ; then
     #PRETTY_NAME
     VENDOR_ID="$ID"
     case "$VENDOR_ID" in
-        ubuntu|reld|rhel|astra|manjaro|redos|msvsphere|alteros)
+        ubuntu|reld|rhel|astra|manjaro|redos|msvsphere|alteros|rockylinux|almalinux)
             ;;
         *)
-            # ID_LIKE can be 'rhel centos fedora', use latest word
-            [ -n "$ID_LIKE" ] && VENDOR_ID="$(echo "$ID_LIKE" | xargs -n1 | tail -n1)"
+            if [ -n "$ID_LIKE" ] ; then
+                # ID_LIKE can be 'rhel centos fedora', use first word
+                VENDOR_ID="$(echo "$ID_LIKE" | xargs -n1 | head -n1)"
+                # use latest word for versions like Fedora has
+                if is_numeric "$DISTRIB_RELEASE" && [ "$DISTRIB_RELEASE" -ge 20 ] ; then
+                    VENDOR_ID="$(echo "$ID_LIKE" | xargs -n1 | tail -n1)"
+                fi
+            fi
             ;;
     esac
     DISTRIB_FULL_RELEASE="$DISTRIB_RELEASE"

tests/etc/RockyLinux/etc/os-release

+NAME="Rocky Linux"
+VERSION="9.4 (Blue Onyx)"
+ID="rocky"
+ID_LIKE="rhel centos fedora"
+VERSION_ID="9.4"
+PLATFORM_ID="platform:el9"
+PRETTY_NAME="Rocky Linux 9.4 (Blue Onyx)"
+ANSI_COLOR="0;32"
+LOGO="fedora-logo-icon"
+CPE_NAME="cpe:/o:rocky:rocky:9::baseos"
+HOME_URL="https://rockylinux.org/"
+BUG_REPORT_URL="https://bugs.rockylinux.org/"
+SUPPORT_END="2032-05-31"
+ROCKY_SUPPORT_PRODUCT="Rocky-Linux-9"
+ROCKY_SUPPORT_PRODUCT_VERSION="9.4"
+REDHAT_SUPPORT_PRODUCT="Rocky Linux"
+REDHAT_SUPPORT_PRODUCT_VERSION="9.4"