CI: Test remaining install methods

.ci/test-install-docs.sh

@@ -6,18 +6,238 @@
 
 set -e
 
+# The go binary isn't installed, but we checkout the repos to the standard
+# golang locations.
+export GOPATH=${GOPATH:-${HOME}/go}
+
+typeset -r script_name="${0##*/}"
+typeset -r script_dir="$(cd "$(dirname "${0}")" && pwd)"
+
+typeset -r docker_image="busybox"
+typeset -r kata_project_url="github.com/kata-containers"
+typeset -r test_repo="${kata_project_url}/tests"
+typeset -r test_repo_url="https://${test_repo}"
+typeset -r test_repo_dir="${GOPATH}/src/${test_repo}"
+typeset -r kata_project_dir="${GOPATH}/src/${kata_project_url}"
+
+typeset -r mgr="${test_repo_dir}/cmd/kata-manager/kata-manager.sh"
+typeset -r doc_to_script="${test_repo_dir}/.ci/kata-doc-to-script.sh"
+
+die()
+{
+	local msg="$*"
+	echo >&2 "ERROR: $msg"
+	exit 1
+}
+
 info()
 {
-	msg="$*"
+	local msg="$*"
 	echo "INFO: $msg"
 }
 
-# Detect if any installation documents changed. If so, run the
-# kata manager to "execute" the install guide to ensure the
-# commands it specified result in a working system.
-check_install_guides()
+usage()
+{
+	cat <<EOT
+Description: Run Kata documentation CI tests.
+
+Usage: $script_name [options]
+
+Options:
+
+ -h        : Show this help.
+ -t <dir>  : Run all scripts ("\*.sh" files) in the specified
+             directory.
+
+Notes:
+  - The '-t' option is not generally useful - it is used by this
+    script which re-exec's itself with this option.
+
+EOT
+}
+
+# Re-execute the running script from a temporary directory to allow the
+# script to continue executing even if the original source file is deleted.
+reexec_in_tmpdir()
+{
+	local -r test_dir="$1"
+
+	[ -d "${test_dir}" ] || die "invalid test dir: ${test_dir}"
+
+	if [ "${script_dir}" = "${test_dir}" ]
+	then
+		# Already running from temp directory so nothing else to do
+		return
+	fi
+
+	local new
+	new="${test_dir}/${script_name}"
+
+	install --mode 750 "${0}" "${new}"
+
+	info "Re-execing ${0} as ${new}"
+
+	cd "${test_dir}"
+
+	exec "${new}" -t "${test_dir}/tests"
+}
+
+# Grab a copy of the tests repository
+get_tests_repo()
+{
+	[ -d "${test_repo_dir}" ] && return
+
+	mkdir -p "${kata_project_dir}"
+
+	git clone "${test_repo_url}" "${test_repo_dir}"
+}
+
+# Delete all local github repo clones.
+#
+# This is required to ensure that the tests themselves (re-)create these
+# clones.
+delete_kata_repos()
+{
+	[ -n "${KATA_DEV_MODE}" ] && die "Not continuing as this is a dev system"
+	[ -z "${CI}" ] && die "Not continuing as this is a non-CI environment"
+
+	local cwd="$PWD"
+
+	info "Deleting all local kata repositories below ${kata_project_dir}"
+
+	[ -d "${kata_project_dir}" ] && rm -rf "${kata_project_dir}" || true
+
+	# Recreate the empty directory, taking care to handle the scenario
+	# where the script is run from within the just-deleted directory.
+	mkdir -p "$cwd" && cd "$cwd"
+}
+
+setup()
+{
+	source /etc/os-release || source /usr/lib/os-release
+
+	mkdir -p "${GOPATH}"
+
+	get_tests_repo
+
+	[ -e "$mgr" ] || die "cannot find $mgr"
+}
+
+# Perform a simple test to create a container
+create_kata_container()
+{
+	local -r test_name="$1"
+
+	local -r msg=$(info "Successfully tested ${test_name} on distro ${ID} ${VERSION}")
+
+	# Perform a basic test
+	sudo -E docker run --rm -i --runtime "kata-runtime" "${docker_image}" echo "$msg"
+}
+
+# Run the kata manager to "execute" the install guide to ensure the commands
+# it specified result in a working system.
+test_distro_install_guide()
+{
+	info "Installing system from the $ID install guide"
+
+	$mgr install-docker-system
+
+	$mgr configure-image
+	$mgr enable-debug
+
+	local mgr_name="${mgr##*/}"
+
+	local test_name="${mgr_name} to test install guide"
+
+	info "Install using ${test_name}"
+
+	create_kata_container "${test_name}"
+
+	# Clean up
+	$mgr remove-packages
+}
+
+# Apart from the distro-specific install guides, users can choose to install
+# using one of the following methods:
+#
+# - kata-manager ("Automatic" method).
+# - kata-doc-to-script ("Scripted" method).
+#
+# Testing these is awkward because we need to "execute" the documents
+# describing those install methods, but since those install methods should
+# themselves entirely document/handle an installation method, we need to
+# convert each install document to a script, then delete all the kata code
+# repositories. This ensures that when each install method script is run, it
+# does not rely on any local files (it should download anything it needs). But
+# since we're deleting the repos, we need to copy this script to a temporary
+# location, along with the install scripts this function generates, and then
+# re-exec this script with an option to ask it to run the scripts the previous
+# instance of this script just generated.
+test_alternative_install_methods()
+{
+	local -a files
+	files+=("installing-with-kata-manager.md")
+	files+=("installing-with-kata-doc-to-script.md")
+
+	local tmp_dir
+
+	tmp_dir=$(mktemp -d)
+
+	local script_file
+
+	local file
+
+	local tests_dir
+	tests_dir="${tmp_dir}/tests"
+
+	mkdir -p "${tests_dir}"
+
+	local -i num=0
+
+	# Convert the docs to scripts
+	for file in "${files[@]}"
+	do
+		num+=1
+
+		local file_path
+		local script_file
+		local script_file_path
+		local test_name
+
+		file_path="${script_dir}/../install/${file}"
+		script_file=${file/.md/.sh}
+
+		# Add a numeric prefix so the tests are run in the array order 
+		test_name=$(printf "%.2d-%s" "${num}" "${script_file}")
+
+		script_file_path="${tests_dir}/${test_name}"
+
+		info "Creating test script ${test_name} from ${file}"
+
+		bash "${doc_to_script}" "${file_path}" "${script_file_path}"
+	done
+
+	reexec_in_tmpdir "${tmp_dir}"
+
+	# Not reached
+	die "re-exec failed"
+}
+
+run_tests()
 {
-	[ -n "$TRAVIS" ] && info "Not testing install guide as Travis lacks modern distro support and VT-x" && return 
+	test_distro_install_guide
+	test_alternative_install_methods
+}
+
+# Detect if any installation documents changed. If so, execute all the
+# documents to test they result in a working system.
+check_install_docs()
+{
+	if [ -n "$TRAVIS" ]
+	then
+		info "Not testing install guide as Travis lacks modern distro support and VT-x"
+		return
+	fi
 
 	# List of filters used to restrict the types of file changes.
 	# See git-diff-tree(1) for further info.
@@ -50,35 +270,79 @@ check_install_guides()
 	# No files were changed
 	[ -z "$files" ] && return
 
-	changed=$(echo "$files" | grep "^install/.*\.md$" || true)
+	changed=$(echo "${files}" | grep "^install/.*\.md$" || true)
 
-	[ -z "$changed" ] && info "No install guides modified" && return
+	[ -z "$changed" ] && info "No install documents modified" && return
 
-	info "Found modified install guides: $changed"
+	info "Found modified install documents: ${changed}"
 
-	# Regardless of which distro install guide(s) were changed, we test
+	# Regardless of which installation documents were changed, we test
 	# them all where possible.
+	run_tests
+}
 
-	local -r GOPATH=$(go env GOPATH)
-	[ -z "$GOPATH" ] && die "cannot determine GOPATH"
+# Run the test scripts in the specified directory.
+run_tests_from_dir()
+{
+	local -r test_dir="$1"
 
-	local -r mgr="${GOPATH}/src/github.com/kata-containers/tests/cmd/kata-manager/kata-manager.sh"
+	[ -e "$test_dir" ] || die "invalid test dir: ${test_dir}"
 
-	[ ! -e "$GOPATH" ] && die "cannot find $mgr"
+	cd "${test_dir}"
 
-	source /etc/os-release
+	info "Looking for tests scripts to run in directory ${test_dir}"
 
-	info "Installing system from the $ID install guide"
+	for t in $(ls -- *.sh)
+	do
+		# Ensure the test script cannot access any local files
+		# (since it should be standalone and download any files
+		# it needs).
+		delete_kata_repos
 
-	$mgr install-docker-system
+		info "Running test script '$t'"
+		bash -x "${t}"
 
-	$mgr configure-image
-	$mgr enable-debug
+		# Ensure it is possible to use the installed system
+		create_kata_container "${t}"
 
-	msg="INFO: Successfully tested install guide for distro '$ID' $VERSION"
+		# Re-run setup to recreate the tests repo that was deleted
+		# before the test ran.
+		setup
 
-	# Perform a basic test
-	sudo -E docker run --rm -i --runtime "kata-runtime" busybox echo "$msg"
+		# Packaged install so clean up
+		# (Note that '$mgr' should now exist again)
+		$mgr remove-packages
+	done
+
+	# paranoia
+	[ -d "${test_dir}" ] && rm -rf "${test_dir}"
+
+	info "All tests passed"
+}
+
+main()
+{
+	local opt
+	local test_dir
+
+	setup
+
+	while getopts "ht:" opt
+	do
+		case "$opt" in
+			h) usage; exit 0;;
+			t) test_dir="$OPTARG";;
+			*) die "invalid option: $opt";;
+		esac
+	done
+
+	if [ -n "$test_dir" ]
+	then
+		run_tests_from_dir "$test_dir"
+		exit 0
+	fi
+
+	check_install_docs
 }
 
-check_install_guides
+main "$@"

install/installing-with-kata-doc-to-script.md

@@ -14,25 +14,34 @@ to generate installation bash scripts.
 > install and configure the container manager manually.
 
 ## Packages Installation
-```
+
+```bash
 $ source /etc/os-release
 $ curl -fsSL -O https://raw.githubusercontent.com/kata-containers/documentation/master/install/${ID}-installation-guide.md
-$ bash -c "$(curl -fsSL \
-    https://raw.githubusercontent.com/kata-containers/tests/master/.ci/kata-doc-to-script.sh) \
-    ${ID}-installation-guide.md \
-    ${ID}-install.sh"
+$ bash -c "$(curl -fsSL https://raw.githubusercontent.com/kata-containers/tests/master/.ci/kata-doc-to-script.sh) ${ID}-installation-guide.md ${ID}-install.sh"
 ```
 
 For example, if your distribution is CentOS, the previous example will generate a runnable shell script called `centos-install.sh`.
+To proceed with the installation, run:
 
-## Docker Installation and Setup
+```bash
+$ source /etc/os-release
+$ bash "./${ID}-install.sh"
 ```
+
+## Docker Installation and Setup
+
+```bash
 $ source /etc/os-release
 $ curl -fsSL -O https://raw.githubusercontent.com/kata-containers/documentation/master/install/docker/${ID}-docker-install.md
-$ bash -c "$(curl -fsSL \
-    https://raw.githubusercontent.com/kata-containers/tests/master/.ci/kata-doc-to-script.sh) \
-    ${ID}-docker-install.md \
-    ${ID}-docker-install.sh"
+$ bash -c "$(curl -fsSL https://raw.githubusercontent.com/kata-containers/tests/master/.ci/kata-doc-to-script.sh) ${ID}-docker-install.md ${ID}-docker-install.sh"
 ```
 
 For example, if your distribution is CentOS, this will generate a runnable shell script called `centos-docker-install.sh`.
+
+To proceed with the Docker installation, run:
+
+```bash
+$ source /etc/os-release
+$ bash "./${ID}-docker-install.sh"
+```