Run all the CLI commands in the Docker environment (#5564)

* [docker] Allow "validate" and "version" in Docker

* [docker] Allow all the available CLI commands

* [docker] Quote some more variables

docker-entrypoint.sh

@@ -6,19 +6,19 @@ set -euo pipefail
 GEN_DIR=${GEN_DIR:-/opt/swagger-codegen}
 JAVA_OPTS=${JAVA_OPTS:-"-Xmx1024M -DloggerPath=conf/log4j.properties"}
 
-codegen="${GEN_DIR}/modules/swagger-codegen-cli/target/swagger-codegen-cli.jar"
+cli="${GEN_DIR}/modules/swagger-codegen-cli"
+codegen="${cli}/target/swagger-codegen-cli.jar"
+cmdsrc="${cli}/src/main/java/io/swagger/codegen/cmd"
 
-case "$1" in
-    generate|help|langs|meta|config-help)
-        # If ${GEN_DIR} has been mapped elsewhere from default, and that location has not been built
-        if [[ ! -f "${codegen}" ]]; then
-            (cd ${GEN_DIR} && exec mvn -am -pl "modules/swagger-codegen-cli" package)
-        fi
-        command=$1
-        shift
-        exec java ${JAVA_OPTS} -jar ${codegen} ${command} "$@"
-        ;;
-    *)  # Any other commands, e.g. docker run imagename ls -la or docker run -it imagename /bin/bash
-        exec "$@"
-        ;;
-esac
+pattern="@Command(name = \"$1\""
+if expr "x$1" : 'x[a-z][a-z-]*$' > /dev/null && fgrep -qe "$pattern" "$cmdsrc"/*.java; then
+    # If ${GEN_DIR} has been mapped elsewhere from default, and that location has not been built
+    if [[ ! -f "${codegen}" ]]; then
+        (cd "${GEN_DIR}" && exec mvn -am -pl "modules/swagger-codegen-cli" package)
+    fi
+    command=$1
+    shift
+    exec java ${JAVA_OPTS} -jar "${codegen}" "${command}" "$@"
+else
+    exec "$@"
+fi