Enable building arm64 images

Modify the Dockerfile and library code around Docker image builds to
support building multiarch images. The Dockerfile will download the
package for the correct architecture based on TARGETARCH variable.

Closes: https://gitlab.com/gitlab-org/omnibus-gitlab/-/issues/8470

Signed-off-by: Balasankar 'Balu' C <balasankar@gitlab.com>

docker/Dockerfile

@@ -10,6 +10,8 @@ ENV LANG=C.UTF-8
 COPY locale.gen /etc/locale.gen
 
 # Install required packages
+# Note: libatomic1 is only required for arm64, but it is small enough to not
+# bother about the conditional inclusion logic
 RUN apt-get update -q \
     && DEBIAN_FRONTEND=noninteractive apt-get install -yq --no-install-recommends \
       busybox \
@@ -20,6 +22,7 @@ RUN apt-get update -q \
       wget \
       perl \
       libperl5.34 \
+      libatomic1 \
     && locale-gen \
     && cp -a /usr/lib/locale/locale-archive /tmp/locale-archive \
     && DEBIAN_FRONTEND=noninteractive apt-get purge -yq locales \
@@ -43,6 +46,8 @@ RUN ln -fs /dev/null /run/motd.dynamic
 # Legacy code to be removed on 17.0.  See: https://gitlab.com/gitlab-org/omnibus-gitlab/-/merge_requests/7035
 ENV GITLAB_ALLOW_SHA1_RSA=false
 
+ARG TARGETARCH
+
 # Copy assets
 COPY RELEASE /
 COPY assets/ /assets/

docker/assets/setup

@@ -10,9 +10,19 @@ source /RELEASE
 sed -i "/DOWNLOAD_URL/d;/CI_JOB_TOKEN/d;" /RELEASE
 
 # Install GitLab
+if [[ "${TARGETARCH}" == "amd64" ]]; then
+  export DOWNLOAD_URL=${DOWNLOAD_URL_amd64}
+elif [[ "${TARGETARCH}" == "arm64" ]]; then
+  export DOWNLOAD_URL=${DOWNLOAD_URL_arm64}
+else
+  echo "Unknown TARGETARCH: DOWNLOAD_URL not set"
+fi
+
 DOWNLOAD_URL=${DOWNLOAD_URL} CI_JOB_TOKEN=${CI_JOB_TOKEN} /assets/download-package && dpkg -i /tmp/gitlab.deb 
 rm -rf /tmp/gitlab.deb /var/lib/apt/lists/*
 
+unset DOWNLOAD_URL_amd64
+unset DOWNLOAD_URL_arm64
 unset DOWNLOAD_URL
 unset CI_JOB_TOKEN
 

gitlab-ci-config/dev-gitlab-org.yml

@@ -315,6 +315,8 @@ Ubuntu-22.04-arm64-branch:
     - !reference [.default_rules, rules]
     - if: '$PIPELINE_TYPE =~ /_(NIGHTLY|BRANCH)_BUILD_PIPELINE$/'
     - if: '$PIPELINE_TYPE =~ /TRIGGERED_(CE|EE)_PIPELINE/'
+      # TODO: When multi-arch images are built by default, make this an
+      # automatic job
       when: manual
       allow_failure: true
 CentOS-7-branch:

lib/gitlab/build/info/docker.rb

@@ -13,15 +13,19 @@ module Build
 
         def release_file_contents
           repo = Gitlab::Util.get_env('PACKAGECLOUD_REPO') # Target repository
+          download_urls = {}.tap do |urls|
+            urls[:amd64] = Build::Info::CI.package_download_url
+            urls[:arm64] = Build::Info::CI.package_download_url(arch: 'arm64')
+          end
 
-          download_url = Build::Info::CI.package_download_url
+          raise "Unable to identify package download URLs." if download_urls.empty?
-          raise "Unable to identify package download URL." unless download_url
 
           contents = []
           contents << "PACKAGECLOUD_REPO=#{repo.chomp}\n" if repo && !repo.empty?
           contents << "RELEASE_PACKAGE=#{Build::Info::Package.name}\n"
           contents << "RELEASE_VERSION=#{Build::Info::Package.release_version}\n"
-          contents << "DOWNLOAD_URL=#{download_url}\n"
+          contents << "DOWNLOAD_URL_amd64=#{download_urls[:amd64]}\n"
+          contents << "DOWNLOAD_URL_arm64=#{download_urls[:arm64]}\n"
           contents << "CI_JOB_TOKEN=#{Build::Info::CI.job_token}\n"
           contents.join
         end

spec/lib/gitlab/build/image_spec.rb

@@ -109,7 +109,8 @@ RSpec.describe Build::Image do
             "PACKAGECLOUD_REPO=download-package",
             "RELEASE_PACKAGE=gitlab-ce",
             "RELEASE_VERSION=12.121.12-ce.0",
-            "DOWNLOAD_URL=https://dev.gitlab.org/api/v4/projects/283/jobs/999999/artifacts/pkg/ubuntu-jammy/gitlab-ce_12.121.12-ce.0_amd64.deb",
+            "DOWNLOAD_URL_amd64=https://dev.gitlab.org/api/v4/projects/283/jobs/999999/artifacts/pkg/ubuntu-jammy/gitlab-ce_12.121.12-ce.0_amd64.deb",
+            "DOWNLOAD_URL_arm64=https://dev.gitlab.org/api/v4/projects/283/jobs/999999/artifacts/pkg/ubuntu-jammy_aarch64/gitlab-ce_12.121.12-ce.0_arm64.deb",
             "CI_JOB_TOKEN=NOT-CI-JOB-TOKEN\n"
           ].join("\n")
         end
@@ -130,7 +131,8 @@ RSpec.describe Build::Image do
             "PACKAGECLOUD_REPO=download-package",
             "RELEASE_PACKAGE=gitlab-ee",
             "RELEASE_VERSION=12.121.12-ee.0",
-            "DOWNLOAD_URL=https://dev.gitlab.org/api/v4/projects/283/jobs/999999/artifacts/pkg/ubuntu-jammy/gitlab-ee_12.121.12-ee.0_amd64.deb",
+            "DOWNLOAD_URL_amd64=https://dev.gitlab.org/api/v4/projects/283/jobs/999999/artifacts/pkg/ubuntu-jammy/gitlab-ee_12.121.12-ee.0_amd64.deb",
+            "DOWNLOAD_URL_arm64=https://dev.gitlab.org/api/v4/projects/283/jobs/999999/artifacts/pkg/ubuntu-jammy_aarch64/gitlab-ee_12.121.12-ee.0_arm64.deb",
             "CI_JOB_TOKEN=NOT-CI-JOB-TOKEN\n"
           ].join("\n")
         end
@@ -159,7 +161,8 @@ RSpec.describe Build::Image do
             "PACKAGECLOUD_REPO=download-package",
             "RELEASE_PACKAGE=gitlab-ce",
             "RELEASE_VERSION=12.121.12-ce.0",
-            "DOWNLOAD_URL=https://gitlab.com/api/v4/projects/20699/jobs/999999/artifacts/pkg/ubuntu-jammy/gitlab-ce_12.121.12-ce.0_amd64.deb",
+            "DOWNLOAD_URL_amd64=https://gitlab.com/api/v4/projects/20699/jobs/999999/artifacts/pkg/ubuntu-jammy/gitlab-ce_12.121.12-ce.0_amd64.deb",
+            "DOWNLOAD_URL_arm64=https://gitlab.com/api/v4/projects/20699/jobs/999999/artifacts/pkg/ubuntu-jammy_aarch64/gitlab-ce_12.121.12-ce.0_arm64.deb",
             "CI_JOB_TOKEN=NOT-CI-JOB-TOKEN\n"
           ].join("\n")
         end
@@ -180,7 +183,8 @@ RSpec.describe Build::Image do
             "PACKAGECLOUD_REPO=download-package",
             "RELEASE_PACKAGE=gitlab-ee",
             "RELEASE_VERSION=12.121.12-ee.0",
-            "DOWNLOAD_URL=https://gitlab.com/api/v4/projects/20699/jobs/999999/artifacts/pkg/ubuntu-jammy/gitlab-ee_12.121.12-ee.0_amd64.deb",
+            "DOWNLOAD_URL_amd64=https://gitlab.com/api/v4/projects/20699/jobs/999999/artifacts/pkg/ubuntu-jammy/gitlab-ee_12.121.12-ee.0_amd64.deb",
+            "DOWNLOAD_URL_arm64=https://gitlab.com/api/v4/projects/20699/jobs/999999/artifacts/pkg/ubuntu-jammy_aarch64/gitlab-ee_12.121.12-ee.0_arm64.deb",
             "CI_JOB_TOKEN=NOT-CI-JOB-TOKEN\n"
           ].join("\n")
         end