From 1512058054bfb701c015a95274fb2bc977620991 Mon Sep 17 00:00:00 2001
From: Andrey Balandin <andrvb@gmail.com>
Date: Tue, 22 Jun 2021 22:54:11 +0300
Subject: [PATCH] Add epicbox-scala/3 image

---
 epicbox-scala/{ => 2}/Dockerfile          |  0
 epicbox-scala/{ => 2}/java_lookup_main.sh |  0
 epicbox-scala/3/Dockerfile                | 16 ++++++++++++++++
 epicbox-scala/3/java_lookup_main.sh       | 15 +++++++++++++++
 4 files changed, 31 insertions(+)
 rename epicbox-scala/{ => 2}/Dockerfile (100%)
 rename epicbox-scala/{ => 2}/java_lookup_main.sh (100%)
 create mode 100644 epicbox-scala/3/Dockerfile
 create mode 100644 epicbox-scala/3/java_lookup_main.sh

diff --git a/epicbox-scala/Dockerfile b/epicbox-scala/2/Dockerfile
similarity index 100%
rename from epicbox-scala/Dockerfile
rename to epicbox-scala/2/Dockerfile
diff --git a/epicbox-scala/java_lookup_main.sh b/epicbox-scala/2/java_lookup_main.sh
similarity index 100%
rename from epicbox-scala/java_lookup_main.sh
rename to epicbox-scala/2/java_lookup_main.sh
diff --git a/epicbox-scala/3/Dockerfile b/epicbox-scala/3/Dockerfile
new file mode 100644
index 0000000..405aca9
--- /dev/null
+++ b/epicbox-scala/3/Dockerfile
@@ -0,0 +1,16 @@
+FROM openjdk:11.0.11-slim
+MAINTAINER Stepik Team <team@stepik.org>
+
+ENV SCALA_VERSION 3.0.0
+ENV PATH /opt/scala/bin:$PATH
+
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends wget && \
+    rm -rf /var/lib/apt/lists/* && \
+    wget -O - https://github.com/lampepfl/dotty/releases/download/$SCALA_VERSION/scala3-$SCALA_VERSION.tar.gz | tar xfz - -C /opt && \
+    mv /opt/scala3-$SCALA_VERSION /opt/scala
+
+COPY java_lookup_main.sh /usr/local/bin/java_lookup_main.sh
+RUN chmod +x /usr/local/bin/java_lookup_main.sh
+
+RUN useradd -M -d /sandbox sandbox
diff --git a/epicbox-scala/3/java_lookup_main.sh b/epicbox-scala/3/java_lookup_main.sh
new file mode 100644
index 0000000..b411051
--- /dev/null
+++ b/epicbox-scala/3/java_lookup_main.sh
@@ -0,0 +1,15 @@
+#!/bin/bash
+# Grep *.class files in the given directory to find one with psvm method defined
+# Usage: java_lookup_main.sh DIRECTORY_PATH
+
+PSVM_REGEX="public static( final)? void main\(java\.lang\.String(\[\]|\.\.\.)\)"
+
+shopt -s nullglob
+for f in "$1"/*.class; do
+    if javap -p "$f" 2> /dev/null | grep -Pq "$PSVM_REGEX"; then
+        filename=$(basename "$f")
+        echo -n "${filename%.*}"
+        exit 0
+    fi
+done
+exit 1