Build for CentOS 9.

Signed-off-by: Romain Geissler <romain.geissler@amadeus.com>

Author: Romain-Geissler-1A

Jenkinsfile

@@ -5,6 +5,7 @@ def branch = env.CHANGE_TARGET ?: env.BRANCH_NAME
 def pkgs = [
     [target: "centos-7",                 image: "centos:7",                               arches: ["amd64", "aarch64"]],          // (EOL: June 30, 2024)
     [target: "centos-8",                 image: "quay.io/centos/centos:stream8",          arches: ["amd64", "aarch64"]],
+    [target: "centos-9",                 image: "quay.io/centos/centos:stream9",          arches: ["amd64", "aarch64"]],
     [target: "debian-buster",            image: "debian:buster",                          arches: ["amd64", "aarch64", "armhf"]], // Debian 10 (EOL: 2024)
     [target: "debian-bullseye",          image: "debian:bullseye",                        arches: ["amd64", "aarch64", "armhf"]], // Debian 11 (Next stable)
     [target: "fedora-34",                image: "fedora:34",                              arches: ["amd64", "aarch64"]],          // EOL: May 17, 2022

rpm/Makefile

@@ -57,7 +57,7 @@ RUN?=docker run --rm \
 	rpmbuild-$@/$(ARCH) $(RPMBUILD_FLAGS)
 
 FEDORA_RELEASES ?= fedora-36 fedora-35 fedora-34
-CENTOS_RELEASES ?= centos-7 centos-8
+CENTOS_RELEASES ?= centos-7 centos-8 centos-9
 ifeq ($(ARCH),s390x)
 RHEL_RELEASES ?= rhel-7
 else
@@ -83,8 +83,8 @@ rpm: fedora centos ## build all rpm packages
 .PHONY: fedora
 fedora: $(FEDORA_RELEASES) ## build all fedora rpm packages
 
-.PHONY: centos-8
-centos-8: RPMBUILD_EXTRA_FLAGS=--define '_without_btrfs 1'
+.PHONY: centos-8 centos-9
+centos-8 centos-9: RPMBUILD_EXTRA_FLAGS=--define '_without_btrfs 1'
 
 .PHONY: centos
 centos: $(CENTOS_RELEASES) ## build all centos rpm packages

rpm/SPECS/docker-ce.spec

@@ -22,7 +22,10 @@ Requires: container-selinux >= 2:2.74
 Requires: libseccomp >= 2.3
 Requires: systemd
 Requires: iptables
+%if %{undefined rhel} || 0%{?rhel} < 9
+# Libcgroup is no longer available in RHEL/CentOS >= 9 distros.
 Requires: libcgroup
+%endif
 Requires: containerd.io >= 1.4.1
 Requires: tar
 Requires: xz