support building x86 and aarch64 RPMs, to handle the oras binary

.github/workflows/artifacts.yml

@@ -17,9 +17,17 @@ jobs:
       - name: build-srpm
         run: |
           set -x
-          ./rpm/generate-rpm.sh -s . -b rpm-build
-          rpmbuild -bs --define "_topdir rpm-build" rpm-build/SPECS/uenv.spec
-          sudo rpmbuild --rebuild "$(find rpm-build/SRPMS -name '*.rpm' -type f -print -quit)" --define "_topdir $(pwd)/rpm-build"
+          # build x86)64
+          ./rpm/generate-rpm.sh -s . -b rpm-build -a x86_64
+          rpmbuild -bs --define "_topdir rpm-build" --target=x86_64 rpm-build/SPECS/uenv.spec
+          sudo rpmbuild --target=x86_64 --rebuild "$(find rpm-build/SRPMS -name '*.rpm' -type f -print -quit)" --define "_topdir $(pwd)/rpm-build"
+          sudo rpm --install "$(find rpm-build/RPMS -name '*.rpm' -type f -print -quit)"
+          find rpm-build -name '*.rpm' -type f -exec cp {} . \;
+          # build aarch64
+          rm -rf ./rpm-build
+          ./rpm/generate-rpm.sh -s . -b rpm-build -a aarch64
+          rpmbuild -bs --define "_topdir rpm-build" --target=aarch64 rpm-build/SPECS/uenv.spec
+          sudo rpmbuild --target=aarch64 --rebuild "$(find rpm-build/SRPMS -name '*.rpm' -type f -print -quit)" --define "_topdir $(pwd)/rpm-build"
           sudo rpm --install "$(find rpm-build/RPMS -name '*.rpm' -type f -print -quit)"
           find rpm-build -name '*.rpm' -type f -exec cp {} . \;
       - name: upload-rpm

.gitignore

@@ -8,4 +8,7 @@ test/scratch
 # site generated by mkdocs
 site
 
+# build path for rpms
+rpm-build
+
 __pycache__

install

@@ -8,8 +8,10 @@ version=$(cat "$script_path/VERSION")
 # default installation destination, only required for building rpm packages
 destdir=""
 
+# takes an argument, either aarch64 or x86_64
+# returns arm64 or amd64, accordingly
 get_oras_arch() {
-  case "$(uname -m)" in
+  case "$1" in
     aarch64)
       echo "arm64"
       ;;
@@ -19,6 +21,10 @@ get_oras_arch() {
   esac
 }
 
+detect_oras_arch() {
+    echo $(get_oras_arch "$(uname -m)")
+}
+
 function usage {
     echo "uenv installer"
     echo "Usage: install [--prefix=] [--yes] [--help]"
@@ -27,6 +33,7 @@ function usage {
     echo "--local   : install locally for this user (default prefix \$HOME/.local)"
     echo "--yes     : default response to all queries is yes"
     echo "--help    : print this message"
+    echo "--arch    : force installing for a specific arch: x86_64 or aarch64"
 }
 
 function prompt_bash_update {
@@ -79,6 +86,13 @@ always_yes=no
 # default install system wide
 local_install=no
 
+# Set the architecture of the system we are installing on.
+# Required when building RPMs on a system with a different arch
+# than the RPM target.
+# Note: only needed to download the appropriate oras tar ball
+# by default we set it to auto, which tries to automatically detect the arch
+oras_arch=auto
+
 # dry-run (systemwide install only)
 uenv_debug=no
 
@@ -105,6 +119,9 @@ do
         --debug)
         uenv_debug=yes
         ;;
+        --arch=*)
+        oras_arch="${arg#*=}"
+        ;;
         --help)
         usage
         exit 0
@@ -166,7 +183,13 @@ run install -D -m755 <(sed "s|@@version@@|$version|g" $script_path/uenv-impl) ${
 
 # install the oras client
 echo "installing oras client"
-oras_arch=$(get_oras_arch)
+# if an architecture is not provided -> auto detect arch
+if [[ "$oras_arch" == "auto" ]]
+then
+    oras_arch=$(detect_oras_arch)
+else
+    oras_arch=$(get_oras_arch "$oras_arch")
+fi
 oras_version=1.1.0
 oras_file=oras_${oras_version}_linux_${oras_arch}.tar.gz
 oras_url=https://github.com/oras-project/oras/releases/download/v${oras_version}/${oras_file}

rpm/generate-rpm.sh

@@ -4,14 +4,20 @@ set -e
 
 # By default use the current path as the root for source and build.
 # This can be configured using command line args for out of tree builds.
-
 source_path="$PWD"
 build_path="$PWD/rpmbuild"
-while getopts s:b: flag
+
+# By default build for x86_64
+# We don't actually build anything - instead the arch is needed to install the
+# correct oras executable.
+uenv_arch="x86_64"
+
+while getopts s:b:a: flag
 do
     case "${flag}" in
         s) source_path=${OPTARG};;
         b) build_path=${OPTARG};;
+        a) uenv_arch=${OPTARG};;
         *) echo "unknown flag ${flag}"; exit 1 ;;
     esac
 done
@@ -40,3 +46,4 @@ tar -czf "${tar_file}" --directory "${build_path}" "${pkg_name}"
 spec_file="${build_path}/SPECS/uenv.spec"
 cp ${source_path}/rpm/uenv.spec.in "${spec_file}"
 sed -i "s|UENV_VERSION|${version}|g" "${spec_file}"
+sed -i "s|UENV_ARCH|${uenv_arch}|g"  "${spec_file}"

rpm/uenv.spec.in

@@ -5,7 +5,6 @@ Summary:        A command line interface for interacting with user environments
 URL:            https://eth-cscs.github.io/uenv
 Source:         %{name}-%{version}.tar.gz
 License:        ETH Zürich/CSCS
-BuildArch:      noarch
 
 %description
 A command line interface for interacting with user environments on Alps at CSCS.
@@ -15,7 +14,7 @@ A command line interface for interacting with user environments on Alps at CSCS.
 %setup -q
 
 %install
-./install --yes --destdir=%{buildroot} --prefix=/opt/cscs
+./install --yes --destdir=%{buildroot} --prefix=/opt/cscs --arch=UENV_ARCH
 
 %files
 /opt/cscs/uenv/