Infer OTP_RELEASE & ERLANG_SDK_HOME if no environment variable is set (…

…#3600)

jps-builder/tests/org/elixir_lang/jps/BuilderTest.java

@@ -21,19 +21,62 @@
 
 import java.io.File;
 import java.io.IOException;
+import java.io.BufferedReader;
+import java.io.InputStreamReader;
+
 
 /**
  * Created by zyuyou on 15/7/17.
  */
 public class BuilderTest extends JpsBuildTestCase {
     private static final String TEST_MODULE_NAME = "m";
     private JpsSdk<SdkProperties> elixirSdk;
-
+    private static String otpReleaseVersion = null;
+
+    /**
+     * Retrieves the OTP Release version, eg 24.3.4.6
+     * This method first checks for an environment variable OTP_RELEASE (used in CI).
+     * If not set, it attempts to infer the version path from the erl command.
+     *
+     * @return A String representing the OTP Release version.
+     * @throws AssertionError if ERLANG_SDK_HOME is not set and cannot be inferred from PATH.
+     */
     private static String otpRelease() {
+        if (otpReleaseVersion != null) {
+            return otpReleaseVersion;
+        }
+
         String otpRelease = System.getenv("OTP_RELEASE");
+        if (otpRelease != null && !otpRelease.isEmpty()) {
+            otpReleaseVersion = otpRelease;
+            return otpRelease;
+        }
 
-        assertNotNull("OTP_RELEASE is not set", otpRelease);
+        try {
+            Process process = Runtime.getRuntime().exec(new String[]{
+                    "erl",
+                    "-eval",
+                    "{ok, Version} = file:read_file(filename:join([code:root_dir(), \"releases\", erlang:system_info(otp_release), \"OTP_VERSION\"])), io:fwrite(Version), halt().",
+                    "-noshell"
+            });
+
+            try (BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()))) {
+                otpRelease = reader.readLine();
+            }
+
+            int exitCode = process.waitFor();
+            if (exitCode != 0) {
+                throw new RuntimeException("Failed to get OTP release. Exit code: " + exitCode);
+            }
+        } catch (IOException | InterruptedException e) {
+            throw new RuntimeException("Failed to get OTP release", e);
+        }
 
+        if (otpRelease == null || otpRelease.isEmpty()) {
+            throw new RuntimeException("Failed to get OTP release");
+        }
+
+        otpReleaseVersion = otpRelease;
         return otpRelease;
     }
 
@@ -42,11 +85,45 @@ private static String elixirSdkHome() {
         return sdkHomeFromEbinDirectory(ebinDirectory());
     }
 
+    /**
+     * Retrieves the Erlang SDK home directory.
+     * This method first checks for an environment variable ERLANG_SDK_HOME.
+     * If not set, it attempts to infer the SDK home from the erl command.
+     *
+     * @return A String representing the path to the Erlang SDK home directory.
+     * @throws AssertionError if ERLANG_SDK_HOME is not set and cannot be retrieved from the erl command.
+     */
     @NotNull
     private static String erlangSdkHome() {
         String erlangSdkHome = System.getenv("ERLANG_SDK_HOME");
 
-        assertNotNull("ERLANG_SDK_HOME is not set", erlangSdkHome);
+        if (erlangSdkHome != null && !erlangSdkHome.isEmpty()) {
+            return erlangSdkHome;
+        }
+
+        try {
+            Process process = Runtime.getRuntime().exec(new String[]{
+                    "erl",
+                    "-eval",
+                    "io:format(\"~s~n\", [code:root_dir()]), halt().",
+                    "-noshell"
+            });
+
+            try (BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()))) {
+                erlangSdkHome = reader.readLine();
+            }
+
+            int exitCode = process.waitFor();
+            if (exitCode != 0) {
+                throw new RuntimeException("Failed to get Erlang SDK home. Exit code: " + exitCode);
+            }
+        } catch (IOException | InterruptedException e) {
+            throw new RuntimeException("Failed to get Erlang SDK home", e);
+        }
+
+        if (erlangSdkHome == null || erlangSdkHome.isEmpty()) {
+            throw new RuntimeException("Failed to get Erlang SDK home");
+        }
 
         return erlangSdkHome;
     }