Read version from postgres -V

Author: eddumelendez

modules/postgresql/src/main/java/org/testcontainers/containers/PostgreSQLContainer.java

@@ -46,7 +46,7 @@ public PostgreSQLContainer(final DockerImageName dockerImageName) {
 
         dockerImageName.assertCompatibleWith(DEFAULT_IMAGE_NAME);
 
-        this.waitStrategy = new PostgreSQLWaitStrategy(dockerImageName.getVersionPart());
+        this.waitStrategy = new PostgreSQLWaitStrategy();
         this.setCommand("postgres", "-c", FSYNC_OFF_OPTION);
 
         addExposedPort(POSTGRESQL_PORT);

modules/postgresql/src/main/java/org/testcontainers/containers/PostgreSQLWaitStrategy.java

@@ -3,35 +3,43 @@
 import org.testcontainers.containers.wait.strategy.AbstractWaitStrategy;
 import org.testcontainers.utility.ComparableVersion;
 
+import java.io.IOException;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
 
 public class PostgreSQLWaitStrategy extends AbstractWaitStrategy {
 
-    private final String version;
-
-    public PostgreSQLWaitStrategy(String version) {
-        this.version = version;
-    }
+    private final Pattern pattern = Pattern.compile("(?s)(?:\\d\\S*)");
 
     @Override
     protected void waitUntilReady() {
-        boolean isAtLeastMajorVersion94 = new ComparableVersion(this.version).isGreaterThanOrEqualTo("9.4");
-
-        List<String> firstAttempt = new ArrayList<>();
-        firstAttempt.add(".*PostgreSQL init process complete.*$");
-        firstAttempt.add(".*database system is ready to accept connections.*$");
-
-        List<String> secondAttempt = new ArrayList<>();
-        if (isAtLeastMajorVersion94) {
-            secondAttempt.add(".*PostgreSQL Database directory appears to contain a database.*$");
+        try {
+            String postgresVersion = this.waitStrategyTarget.execInContainer("postgres", "-V").getStdout();
+            Matcher matcher = this.pattern.matcher(postgresVersion);
+            if (matcher.find()) {
+                String version = matcher.group();
+                boolean isAtLeastMajorVersion94 = new ComparableVersion(version).isGreaterThanOrEqualTo("9.4");
+
+                List<String> firstAttempt = new ArrayList<>();
+                firstAttempt.add(".*PostgreSQL init process complete.*$");
+                firstAttempt.add(".*database system is ready to accept connections.*$");
+
+                List<String> secondAttempt = new ArrayList<>();
+                if (isAtLeastMajorVersion94) {
+                    secondAttempt.add(".*PostgreSQL Database directory appears to contain a database.*$");
+                }
+                secondAttempt.add(".*database system is ready to accept connections.*$");
+
+                new MultiLogMessageWaitStrategy()
+                    .withRegEx(firstAttempt)
+                    .withRegEx(secondAttempt)
+                    .waitUntilReady(this.waitStrategyTarget);
+            }
+        } catch (IOException | InterruptedException e) {
+            throw new RuntimeException(e);
         }
-        secondAttempt.add(".*database system is ready to accept connections.*$");
-
-        new MultiLogMessageWaitStrategy()
-            .withRegEx(firstAttempt)
-            .withRegEx(secondAttempt)
-            .waitUntilReady(this.waitStrategyTarget);
     }
 
 }