hack/validate: Check if replace rules are needed

Signed-off-by: Paweł Gronowski <pawel.gronowski@docker.com>

hack/validate/module-replace

@@ -0,0 +1,44 @@
+#!/usr/bin/env bash
+set -e
+
+SCRIPTDIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+source "${SCRIPTDIR}/.validate"
+
+IFS=$'\n'
+api_files=$(validate_diff --diff-filter=ACMR --name-only -- 'api/' || true)
+client_files=$(validate_diff --diff-filter=ACMR --name-only -- 'client/' || true)
+unset IFS
+
+has_errors=0
+
+cat go.mod
+
+# Check if changes to ./api require a replace rule in go.mod
+if [ -n "${TEST_FORCE_VALIDATE:-}" ] || [ ${#api_files[@]} -gt 0 ]; then
+	echo "Detected changes in ./api directory, checking for replace rule..."
+	if ! go list -mod=readonly -m -json github.com/moby/moby/api | jq -e '.Replace'; then
+		echo >&2 "ERROR: Changes detected in ./api but go.mod is missing a replace rule for github.com/moby/moby/api"
+		echo >&2 "Please run ./hack/vendor.sh replace"
+		has_errors=1
+	else
+		echo "✓ Found replace rule for github.com/moby/moby/api"
+	fi
+fi
+
+# Check if changes to ./client require a replace rule in go.mod
+if [ -n "${TEST_FORCE_VALIDATE:-}" ] || [ ${#client_files[@]} -gt 0 ]; then
+	echo "Detected changes in ./client directory, checking for replace rule..."
+	if ! go list -mod=readonly -m -json github.com/moby/moby/client | jq -e '.Replace'; then
+		echo >&2 "ERROR: Changes detected in ./client but go.mod is missing a replace rule for github.com/moby/moby/client"
+		echo >&2 "Please run ./hack/vendor.sh replace"
+		has_errors=1
+	else
+		echo "✓ Found replace rule for github.com/moby/moby/client"
+	fi
+fi
+
+if [ $has_errors -eq 1 ]; then
+	exit 1
+fi
+
+echo "PASS: Module replace rules are correct"