tests: basic support for podman with testcontainers

test.sh

@@ -1,18 +1,48 @@
 #!/usr/bin/env sh
+# Run all tests for simpleblob.
+# The arguments passed to this script will be passed to the `go test` command.
+#
+# Note that the tests rely on testcontainers.
+# In case Podman is available, it is used.
+# You can bypass Podman or force the use of a specific backend by setting DOCKER_HOST,
+# with a command such as:
+# 	docker context ls --format '{{if .Current}}{{.DockerEndpoint}}{{end}}'
+set -eu
 
-set -ex
+# Try to use Podman by default.
+if [ -n "${DOCKER_HOST:-}" ]; then
+    printf 'DOCKER_HOST is set in environment, %s will be used.\n' "$DOCKER_HOST"
+elif command -v podman >/dev/null; then
+    # See https://podman-desktop.io/tutorial/testcontainers-with-podman#setup-testcontainers-with-podman
+    kernel_name="$(uname -s)"
+    case "$kernel_name" in
+        Linux)  socket_path="${XDG_RUNTIME_DIR:-/run/user/$(id --user)}/podman/podman.sock"
+            ;;
+        Darwin) socket_path="$(podman machine inspect --format '{{.ConnectionInfo.PodmanSocket.Path}}')"
+            ;;
+        *) printf '%s is not supported.\n' "$kernel_name"; exit 1
+            ;;
+    esac
+    if [ -e "$socket_path" ]; then
+        export DOCKER_HOST="unix://${socket_path}"
+        # TESTCONTAINERS_RYUK_DISABLED improves stability because the Ryuk container,
+        # used for cleanup, does not always work with Podman.
+        export TESTCONTAINERS_RYUK_DISABLED=true
+    fi
+fi
 
+echo 'Running tests'
 go test -count=1 "$@" ./...
 
-# Run linters
-# Configure linters in .golangci.yml
+echo
+echo 'Running linters'
 expected_version=2.4.0
-expected_version_full=v"$expected_version"
 golangci_lint_bin=./bin/golangci-lint
 if ! "$golangci_lint_bin" version | grep -wq "version $expected_version"; then
     # This is the recommended installation process.
     # The installer downloads to ./bin/ by default.
     # see https://golangci-lint.run/usage/install/
-    curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s "$expected_version_full"
+    echo "Downloading golangci-lint v$expected_version to ./bin/"
+    curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s v"$expected_version"
 fi
-"$golangci_lint_bin" run
+exec "$golangci_lint_bin" run