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60 lines
2.3 KiB
Markdown
60 lines
2.3 KiB
Markdown
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# `postgresqlTestHook` {#sec-postgresqlTestHook}
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This hook starts a PostgreSQL server during the `checkPhase`. Example:
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```nix
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{ stdenv, postgresql, postgresqlTestHook }:
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stdenv.mkDerivation {
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# ...
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checkInputs = [
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postgresql
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postgresqlTestHook
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];
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}
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```
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If you use a custom `checkPhase`, remember to add the `runHook` calls:
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```nix
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checkPhase ''
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runHook preCheck
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# ... your tests
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runHook postCheck
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''
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```
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## Variables {#sec-postgresqlTestHook-variables}
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The hook logic will read a number of variables and set them to a default value if unset or empty.
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Exported variables:
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- `PGDATA`: location of server files.
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- `PGHOST`: location of UNIX domain socket directory; the default `host` in a connection string.
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- `PGUSER`: user to create / log in with, default: `test_user`.
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- `PGDATABASE`: database name, default: `test_db`.
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Bash-only variables:
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- `postgresqlTestUserOptions`: SQL options to use when creating the `$PGUSER` role, default: `LOGIN`.
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- `postgresqlTestSetupSQL`: SQL commands to run as database administrator after startup, default: statements that create `$PGUSER` and `$PGDATABASE`.
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- `postgresqlTestSetupCommands`: bash commands to run after database start, defaults to running `$postgresqlTestSetupSQL` as database administrator.
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- `postgresqlEnableTCP`: set to `1` to enable TCP listening. Flaky; not recommended.
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- `postgresqlStartCommands`: defaults to `pg_ctl start`.
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## TCP and the Nix sandbox {#sec-postgresqlTestHook-tcp}
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`postgresqlEnableTCP` relies on network sandboxing, which is not available on macOS and some custom Nix installations, resulting in flaky tests.
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For this reason, it is disabled by default.
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The preferred solution is to make the test suite use a UNIX domain socket connection. This is the default behavior when no `host` connection parameter is provided.
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Some test suites hardcode a value for `host` though, so a patch may be required. If you can upstream the patch, you can make `host` default to the `PGHOST` environment variable when set. Otherwise, you can patch it locally to omit the `host` connection string parameter altogether.
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::: {.note}
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The error `libpq: failed (could not receive data from server: Connection refused` is generally an indication that the test suite is trying to connect through TCP.
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:::
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