Build RPMs in GitHub actions

.github/workflows/build-and-release-rpm.yaml

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+name: Release Prometheus Slurm Exporter RPM
+
+on:
+  workflow_dispatch:
+    inputs:
+      release-tag:
+        type: string
+        description: Tag to release (e.g. 0.20)
+        required: true
+jobs:
+  build-rocky-rpms:
+    runs-on: ubuntu-latest
+    container:
+      image: rockylinux:8.5
+
+    # Required to upload the built RPM to the release
+    permissions:
+      contents: write
+
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+
+      - name: Install Prerequisites
+        run: dnf install -y rpm-build rpmdevtools make git go
+
+      - name: Prepare RPMBUILD Environment
+        run: |
+          mkdir -p ~/rpmbuild/{BUILD,RPMS,SOURCES,SPECS,SRPMS,tmp} &&
+          echo '%_topdir %(echo $HOME)/rpmbuild' > ~/.rpmmacros &&
+          cp README.md ~/rpmbuild/SOURCES &&
+          cp LICENSE ~/rpmbuild/SOURCES &&
+          cp lib/systemd/prometheus-slurm-exporter.service ~/rpmbuild/SOURCES &&
+          cp packages/rpm-ci/*.spec ~/rpmbuild/SPECS
+
+      - name: Build RPM
+        run: |
+          cd ~/rpmbuild || exit 1
+          spectool -g -R --define '_version ${{ github.event.inputs.release-tag }}' SPECS/prometheus-slurm-exporter.spec
+          rpmbuild -bb --define '_version ${{ github.event.inputs.release-tag }}' SPECS/prometheus-slurm-exporter.spec
+
+      - name: Move RPM
+        run: |
+          mkdir -p RPMS
+          cp ~/rpmbuild/RPMS/*/*.rpm RPMS/
+
+      - name: Release RPM
+        uses: softprops/action-gh-release@v1
+        with:
+          tag_name: "${{ github.event.inputs.release-tag }}"
+          files: "RPMS/*"

packages/rpm-ci/README.md

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+## GitHub Actions rpmbuild environment
+
+Generally this directory is used by the Release Prometheus Slurm Exporter RPM [workflow](https://github.com/stackhpc/prometheus-slurm-exporter/actions/workflows/build-and-release-rpm.yaml) to
+build and release prometheus-slurm-exporter RPMs.
+
+To trigger a build of an RPM for a new version of prometheus-slurm-exporter, run the following commands to sync the upstream repository:
+
+```bash
+git clone [email protected]:stackhpc/prometheus-slurm-exporter.git
+cd prometheus-slurm-exporter
+git remote add upstream https://github.com/vpenso/prometheus-slurm-exporter
+git fetch upstream
+git fetch upstream --tags
+git checkout master
+git merge upstream/master
+git push origin master
+git push origin master --tags
+```
+
+Then, the Release Prometheus Slurm Exporter RPM [workflow](https://github.com/stackhpc/prometheus-slurm-exporter/actions/workflows/build-and-release-rpm.yaml) can then be triggered with
+with a newly-synced tag.
+
+
+## Setup a development environment
+
+In order to build your own RPMs you have to setup your own _development environment_ as explained [here](https://wiki.centos.org/HowTos/SetupRpmBuildEnvironment).
+
+### Quick setup
+
+1. Install the ``rpm-build`` and ``rpmdevtools`` packages.
+
+2. Login as **normal user** and create the following structure in the home directory:
+```bash
+mkdir -p ~/rpmbuild/{BUILD,RPMS,SOURCES,SPECS,SRPMS}
+```
+3. Create the RPM macros file with the following content:
+```bash
+echo "%_topdir $HOME/rpmbuild" > ~/.rpmmacros
+```
+
+### Prepare the build
+
+4. Clone this repo:
+```bash
+git clone https://github.com/vpenso/prometheus-slurm-exporter.git
+```
+5. Get into the source directory and copy the following files under ``~/rpmbuild/SOURCES``:
+```bash
+cd prometheus-slurm-exporter
+cp README.md ~/rpmbuild/SOURCES
+cp LICENSE ~/rpmbuild/SOURCES
+cp lib/systemd/prometheus-slurm-exporter.service ~/rpmbuild/SOURCES
+```
+6. Copy the SPEC file in the proper directory:
+```bash
+cd prometheus-slurm-exporter
+cp packages/rpm-ci/*.spec ~/rpmbuild/SPECS
+```
+
+### Build the RPM package
+
+8. Build the RPM based on your SPEC file:
+```bash
+cd $HOME/rpmbuild/SPECS
+spectool -g -R --define '_version {prometheus_slurm_exporter_release_version}' prometheus-slurm-exporter.spec
+rpmbuild -ba --define '_version {prometheus_slurm_exporter_release_version}' prometheus-slurm-exporter.spec
+```
+9. The RPM package will be placed under $HOME/rpmbuild/RPMS/x86_64

packages/rpm-ci/prometheus-slurm-exporter.spec

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+%define        __spec_install_post %{nil}
+%define          debug_package %{nil}
+%define        __os_install_post %{_dbpath}/brp-compress
+
+Name:           prometheus-slurm-exporter
+Version:        %{_version}
+Release:        1%{?dist}
+Summary:        Prometheus exporter for SLURM metrics
+Group:          Monitoring
+
+License:        GPL 3.0
+URL:            https://github.com/vpenso/prometheus-slurm-exporter
+
+Source0:        https://github.com/vpenso/prometheus-slurm-exporter/archive/refs/tags/%{version}.tar.gz
+Source1:        %{name}.service
+Source2:        LICENSE
+Source3:        README.md
+Source4:        %{name}
+
+Requires(pre): shadow-utils
+
+Requires(post): systemd
+Requires(preun): systemd
+Requires(postun): systemd
+%{?systemd_requires}
+BuildRequires:  systemd
+
+BuildRoot:      %{_tmppath}/%{name}-%{version}-1-root
+
+%description
+A Prometheus exporter for metrics extracted from the Slurm resource scheduling system.
+
+%prep
+%setup -q
+
+%build
+go build -v -o %{_sourcedir}/%{name}
+
+%install
+rm -rf %{buildroot}
+mkdir -vp %{buildroot}
+mkdir -vp %{buildroot}%{_unitdir}/
+mkdir -vp %{buildroot}/usr/bin
+mkdir -vp %{buildroot}/usr/share/doc/%{name}-%{version}
+mkdir -vp %{buildroot}/var/lib/prometheus
+install -m 644 %{SOURCE1} %{buildroot}/usr/lib/systemd/system/%{name}.service
+install -m 644 %{SOURCE2} %{buildroot}/usr/share/doc/%{name}-%{version}/LICENSE
+install -m 644 %{SOURCE3} %{buildroot}/usr/share/doc/%{name}-%{version}/README.md
+install -m 755 %{SOURCE4} %{buildroot}/usr/bin/%{name}
+
+%clean
+rm -rf %{buildroot}
+
+%pre
+getent group prometheus >/dev/null || groupadd -r prometheus
+getent passwd prometheus >/dev/null || \
+    useradd -r -g prometheus -d /var/lib/slurm_exporter -s /sbin/nologin \
+    -c "Prometheus exporter user" prometheus
+exit 0
+
+%post
+%systemd_post %{name}.service
+
+%preun
+%systemd_preun %{name}.service
+
+%postun
+%systemd_postun_with_restart %{name}.service
+
+%files
+%defattr(-,root,root,-)
+%doc LICENSE
+%doc README.md
+%{_bindir}/%{name}
+/usr/share/doc/%{name}-%{version}/
+%{_unitdir}/%{name}.service
+%attr(755, prometheus, prometheus)/var/lib/prometheus
+