Rename ctrld v2.0.0 to ctrld-client

Updates #565

scripts/docker-smoke.sh

@@ -0,0 +1,53 @@
+#!/bin/bash
+# Build a Docker image and prove the binary its ENTRYPOINT names is actually in it.
+#
+# The container path has no compile-time link to the build: the image copies an
+# artifact whose name comes from scripts/build.sh and starts it by a name spelled
+# out in the Dockerfile. Renaming the binary once left both Dockerfiles copying a
+# glob that matched nothing and starting a file that did not exist - the image
+# built clean and only failed at "docker run". Nothing in the test suite covers
+# that, so this does.
+#
+# Usage: docker-smoke.sh [dockerfile ...]   (default: both docker/Dockerfile*)
+
+set -euo pipefail
+
+dockerfiles=("$@")
+if [ ${#dockerfiles[@]} -eq 0 ]; then
+  dockerfiles=(docker/Dockerfile docker/Dockerfile.debug)
+fi
+
+repo_root="$(cd "$(dirname "$0")/.." && pwd)"
+cd -- "$repo_root"
+
+status=0
+for dockerfile in "${dockerfiles[@]}"; do
+  tag="ctrld-client-smoke:$(basename "$dockerfile" | tr '[:upper:]' '[:lower:]')"
+  echo ">>> building $dockerfile as $tag"
+  docker build -q -t "$tag" -f "$dockerfile" .
+
+  # Override the entrypoint rather than appending an argument to it: the image's
+  # ENTRYPOINT is "<binary> run", so a bare "docker run <image> --version" asks the
+  # run subcommand for a version and starts the proxy instead of exiting. Naming
+  # the binary explicitly is also the stronger check - it fails if the file is
+  # absent or not executable, which is the regression this guards.
+  echo ">>> running $tag entrypoint binary with --version"
+  if ! out=$(docker run --rm --entrypoint ./ctrld-client "$tag" --version 2>&1); then
+    echo >&2 "FAIL: $dockerfile: could not run the image's entrypoint: $out"
+    status=1
+    docker image rm -f "$tag" >/dev/null 2>&1 || :
+    continue
+  fi
+
+  echo "    $out"
+  case "$out" in
+    "ctrld-client version "*) echo "    OK: $dockerfile" ;;
+    *)
+      echo >&2 "FAIL: $dockerfile: unexpected --version output: $out"
+      status=1
+      ;;
+  esac
+  docker image rm -f "$tag" >/dev/null 2>&1 || :
+done
+
+exit "$status"