Add test_zenith_regress.py that runs pg_regress styled tests from test_runner/zenith_regress.

TODO: remove similar tests from vendor/postgres testset

test_runner/batch_pg_regress/test_zehith_regress.py

@@ -0,0 +1,62 @@
+import pytest
+from fixtures.utils import mkdir_if_needed
+import getpass
+import os
+import psycopg2
+
+pytest_plugins = ("fixtures.zenith_fixtures")
+
+# FIXME: put host + port in a fixture
+HOST = 'localhost'
+PORT = 55432
+
+
+def test_zenith_regress(pageserver, postgres, pg_bin, zenith_cli, test_output_dir, pg_distrib_dir, base_dir, capsys):
+
+    # Create a branch for us
+    zenith_cli.run(["branch", "test_zenith_regress", "empty"]);
+
+    # Connect to postgres and create a database called "regression".
+    pg = postgres.create_start('test_zenith_regress')
+    pg_conn = psycopg2.connect(pg.connstr())
+    pg_conn.set_isolation_level(psycopg2.extensions.ISOLATION_LEVEL_AUTOCOMMIT)
+    cur = pg_conn.cursor()
+    cur.execute('CREATE DATABASE regression')
+    pg_conn.close()
+
+    # Create some local directories for pg_regress to run in.
+    runpath = os.path.join(test_output_dir, 'regress')
+    mkdir_if_needed(runpath)
+    mkdir_if_needed(os.path.join(runpath, 'testtablespace'))
+
+    # Compute all the file locations that pg_regress will need.
+    # This test runs zenith specific tests
+    build_path = os.path.join(
+        pg_distrib_dir, 'build/src/test/regress')
+    src_path = os.path.join(
+        base_dir, 'test_runner/zenith_regress')
+    bindir = os.path.join(pg_distrib_dir, 'bin')
+    schedule = os.path.join(src_path, 'parallel_schedule')
+    pg_regress = os.path.join(build_path, 'pg_regress')
+
+    pg_regress_command = [
+        pg_regress,
+        '--use-existing',
+        '--bindir={}'.format(bindir),
+        '--dlpath={}'.format(build_path),
+        '--schedule={}'.format(schedule),
+        '--inputdir={}'.format(src_path),
+    ]
+
+    print(pg_regress_command)
+    env = {
+        'PGPORT': str(pg.port),
+        'PGUSER': pg.username,
+        'PGHOST': pg.host,
+    }
+
+    # Run the command.
+    # We don't capture the output. It's not too chatty, and it always
+    # logs the exact same data to `regression.out` anyway.
+    with capsys.disabled():
+        pg_bin.run(pg_regress_command, env=env, cwd=runpath)