tests: enable Github action

With this patch, four kinds of tests are triggered when there is a
pull request created in a Github kexec-tools repo,
   - format check using shfmt
   - static analysis using shellcheck
   - ShellSpec unit tests (test cases in spec/)
   - integration tests ( tests cases in tests/)

The tests are run inside a docker image. This docker image has all the
needed software installed including fedpkg, shellspec and etc. This
Docker image also provides
/usr/share/cloud_images/Fedora-Cloud-Base-Generic.x86_64-40-1.14.qcow2 to avoid
repeatedly downloading the Fedora 40 cloud base image each time the
tests are triggered.

Signed-off-by: Coiby Xu <coxu@redhat.com>

.github/workflows/main.yml

@@ -0,0 +1,53 @@
+name: kexec-tools tests
+
+on: pull_request
+
+jobs:
+  format-check:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - run: wget https://github.com/mvdan/sh/releases/download/v3.4.3/shfmt_v3.4.3_linux_amd64 -O /usr/local/bin/shfmt && chmod +x /usr/local/bin/shfmt
+      - run: shfmt -d *.sh kdumpctl mk*dumprd
+
+  static-analysis:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - run: curl -L -O https://github.com/koalaman/shellcheck/releases/download/v0.8.0/shellcheck-v0.8.0.linux.x86_64.tar.xz && tar -xJf shellcheck-v0.8.0.linux.x86_64.tar.xz
+      # Currently, for kexec-tools, there is need for shellcheck to require
+      # the sourced file to give correct warnings about the checked file
+      - run: shellcheck-v0.8.0/shellcheck --exclude=1090,1091 *.sh spec/*.sh kdumpctl mk*dumprd
+
+  unit-tests:
+    runs-on: ubuntu-latest
+    container: docker.io/fedora:latest
+    steps:
+      - uses: actions/checkout@v2
+      - run: sudo dnf install -y make dracut grubby hostname
+      - run: curl -L -O https://github.com/shellspec/shellspec/archive/latest.tar.gz && tar -xzf latest.tar.gz
+      - run: cd shellspec-latest && sudo make install
+      - run: shellspec
+
+  integration-tests:
+        runs-on: self-hosted
+        timeout-minutes: 45
+        concurrency:
+            group: ${{ github.workflow }}-${{ github.ref }}-${{ matrix.container }}-${{ matrix.test }}
+            cancel-in-progress: true
+        strategy:
+            matrix:
+                container: [
+                        "fedora:40",
+                ]
+            fail-fast: false
+        container:
+            image: ghcr.io/coiby/${{ matrix.container }}
+            options: "--privileged -v /dev:/dev -v /lib/modules:/lib/modules:ro"
+        steps:
+            -   name: "Checkout Repository"
+                uses: actions/checkout@v2
+                with:
+                    fetch-depth: 0
+            -   name: "${{ matrix.container }} kdump tests"
+                run: bash ./tools/run-integration-tests.sh

tools/run-integration-tests.sh

@@ -0,0 +1,29 @@
+#!/bin/bash
+set -ex
+
+[[ -d ${0%/*} ]] && cd "${0%/*}"/../
+
+source /etc/os-release
+
+cd tests
+
+# fedpkg fetch sources based on branch.f$VERSION_ID.remote
+if ! grep -q fedora_src <(git remote show); then
+	git remote add fedora_src https://src.fedoraproject.org/rpms/kexec-tools.git
+fi
+git config --add branch.f$VERSION_ID.remote fedora_src
+
+can_we_use_qemu_nbd()
+{
+	_tmp_img=/tmp/test.qcow2
+
+	(sudo -v && sudo modprobe nbd \
+		&& qemu-img create -fqcow2 $_tmp_img 10m \
+		&& qemu-nbd -c /dev/nbd0 $_tmp_img && sudo qemu-nbd -d /dev/nbd0 && rm $_tmp_img) &> /dev/null
+}
+
+if ! can_we_use_qemu_nbd; then
+	USE_GUESTMOUNT=1
+fi
+
+KUMP_TEST_QEMU_TIMEOUT=20m USE_GUESTMOUNT=$USE_GUESTMOUNT BASE_IMAGE=/usr/share/cloud_images/Fedora-Cloud-Base-Generic.x86_64-40-1.14.qcow2 RELEASE=$VERSION_ID make test-run