test_runner: add Postgres version check

test_runner/fixtures/neon_fixtures.py

@@ -970,7 +970,7 @@ class NeonEnv:
 
     Some notable functions and fields in NeonEnv:
 
-    postgres - A factory object for creating postgres compute nodes.
+    endpoints - A factory object for creating postgres compute nodes.
 
     pageservers - An array containing objects representing the pageservers
 

test_runner/regress/test_postgres_version.py

@@ -0,0 +1,26 @@
+import json
+from pathlib import Path
+
+from fixtures.neon_fixtures import PgBin
+from fixtures.pg_version import PgVersion
+
+
+def test_postgres_version(base_dir: Path, pg_bin: PgBin, pg_version: PgVersion):
+    """Test that Postgres version matches the one we expect"""
+
+    with (base_dir / "vendor" / "revisions.json").open() as f:
+        expected_revisions = json.load(f)
+
+    output_prefix = pg_bin.run_capture(["postgres", "--version"], with_command_header=False)
+    stdout = Path(f"{output_prefix}.stdout")
+    assert stdout.exists(), "postgres --version didn't print anything to stdout"
+
+    with stdout.open() as f:
+        output = f.read().strip()
+
+    # `postgres --version` prints something like "postgres (PostgreSQL) 14.8 1144aee1661c79eec65e784a8dad8bd450d9df79".
+    # We need only last 2 components of it — verison itself and SHA of the commit.
+    _, version, sha = output.rsplit(" ", 2)
+
+    msg = f"Unexpected Postgres {pg_version} version: `{output}`, please update `vendor/revisions.json` if these changes are intentional"
+    assert (version, sha) == expected_revisions[pg_version], msg

vendor/revisions.json

@@ -1,5 +1,5 @@
 {
-  "postgres-v16": "261497dd63ace434045058b1453bcbaaa83f23e5",
-  "postgres-v15": "85d809c124a898847a97d66a211f7d5ef4f8e0cb",
-  "postgres-v14": "d9149dc59abcbeeb26293707509aef51752db28f"
+  "16.2": "261497dd63ace434045058b1453bcbaaa83f23e5",
+  "15.6": "85d809c124a898847a97d66a211f7d5ef4f8e0cb",
+  "14.11": "d9149dc59abcbeeb26293707509aef51752db28f"
 }