Support RHEL 9

This patch includes changes required to run devstack on RHEL 9.

- en_US.utf8 is provided by glibc-langpack-en
- iptables command is provided by iptables-nft
- Use /etc/os-release to identify the distro in RHEL 9 as it doesn't
  provide lsb_release command.
- CRB repository name is different from CentOS 9

Change-Id: I8f6d9263b24f9c2cf82e09258e2d14d7766ad337

files/rpms/general

@@ -6,9 +6,11 @@ gcc
 gcc-c++
 gettext  # used for compiling message catalogs
 git-core
+glibc-langpack-en # dist:rhel9
 graphviz # needed only for docs
 httpd
 httpd-devel
+iptables-nft # dist:rhel9
 iptables-services
 java-1.8.0-openjdk-headless
 libffi-devel

functions-common

@@ -412,9 +412,9 @@ function _ensure_lsb_release {
 #  - os_VENDOR
 #  - os_PACKAGE
 function GetOSVersion {
-    # CentOS Stream 9 does not provide lsb_release
+    # CentOS Stream 9 and RHEL 9 do not provide lsb_release
     source /etc/os-release
-    if [[ "${ID}${VERSION}" == "centos9" ]]; then
+    if [[ "${ID}${VERSION}" == "centos9" ]] || [[ "${ID}${VERSION}" =~ "rhel9" ]]; then
         os_RELEASE=${VERSION_ID}
         os_CODENAME="n/a"
         os_VENDOR=$(echo $NAME | tr -d '[:space:]')
@@ -530,6 +530,7 @@ function is_fedora {
         [ "$os_VENDOR" = "openEuler" ] || \
         [ "$os_VENDOR" = "RedHatEnterpriseServer" ] || \
         [ "$os_VENDOR" = "RedHatEnterprise" ] || \
+        [ "$os_VENDOR" = "RedHatEnterpriseLinux" ] || \
         [ "$os_VENDOR" = "Rocky" ] || \
         [ "$os_VENDOR" = "CentOS" ] || [ "$os_VENDOR" = "CentOSStream" ] || \
         [ "$os_VENDOR" = "AlmaLinux" ] || \

stack.sh

@@ -391,7 +391,10 @@ if [[ $DISTRO == "rhel8" ]]; then
     # Patch: https://github.com/rpm-software-management/dnf/pull/1448
     echo "[]" | sudo tee /var/cache/dnf/expired_repos.json
 elif [[ $DISTRO == "rhel9" ]]; then
+    # for CentOS Stream 9 repository
     sudo dnf config-manager --set-enabled crb
+    # for RHEL 9 repository
+    sudo dnf config-manager --set-enabled codeready-builder-for-rhel-9-x86_64-rpms
     # rabbitmq and other packages are provided by RDO repositories.
     _install_rdo