Oleks
ffc4494486
Probe --json support via nix build --help and parse structured output when available (robust across Nix versions and locales). Falls back to the #5 text scraper on older Nix or unexpected payloads, feeding the same tri-state contract.
96 lines
2.7 KiB
Python
96 lines
2.7 KiB
Python
"""Tests for dry-run parsing and DAG restriction in :mod:`nix_estimator.graph`."""
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from nix_estimator import graph
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# --- captured `nix build --dry-run` text (issue #5) ------------------------
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WARM = """\
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this path will be fetched (0.02 MiB download, 0.10 MiB unpacked):
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/nix/store/aaa-hello-2.12.1
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"""
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PARTIAL = """\
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these 2 derivations will be built:
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/nix/store/bbb-foo-1.0.drv
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/nix/store/ccc-bar-2.0.drv
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these 3 paths will be fetched (1.0 MiB download):
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/nix/store/ddd-baz-3.0
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"""
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GARBAGE = """\
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error: some totally unrelated failure with no dry-run structure
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traceback blah blah
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"""
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def test_warm_cache_only_fetched_is_empty_set():
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# dry-run succeeded, nothing to build: distinct from a parse failure
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result = graph.parse_dry_run_text(WARM, returncode=0)
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assert result == set()
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def test_partial_returns_only_built_drvs():
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result = graph.parse_dry_run_text(PARTIAL, returncode=0)
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assert result == {"bbb-foo-1.0.drv", "ccc-bar-2.0.drv"}
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def test_garbage_without_header_and_failure_is_none():
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assert graph.parse_dry_run_text(GARBAGE, returncode=1) is None
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def test_clean_exit_without_header_is_empty_not_none():
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# exit 0 but no recognizable header still counts as "nothing to build"
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assert graph.parse_dry_run_text("", returncode=0) == set()
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# --- structured `nix build --dry-run --json` output (issue #8) -------------
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JSON_PARTIAL = """\
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[
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{"drvPath": "/nix/store/bbb-foo-1.0.drv", "outputs": {"out": "/nix/store/e-foo"}},
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{"drvPath": "/nix/store/ccc-bar-2.0.drv", "outputs": {"out": "/nix/store/f-bar"}}
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]
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"""
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JSON_WARM = "[]"
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JSON_ALT_KEY = '[{"drv": "/nix/store/ggg-qux-9.drv"}]'
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def test_json_partial_returns_built_drvs():
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assert graph.parse_dry_run_json(JSON_PARTIAL) == {
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"bbb-foo-1.0.drv",
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"ccc-bar-2.0.drv",
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}
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def test_json_warm_cache_is_empty_set():
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assert graph.parse_dry_run_json(JSON_WARM) == set()
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def test_json_alternate_drv_key():
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assert graph.parse_dry_run_json(JSON_ALT_KEY) == {"ggg-qux-9.drv"}
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def test_json_non_structured_is_none():
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# human text or an unexpected shape must fall back (None), not crash
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assert graph.parse_dry_run_json(WARM) is None
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assert graph.parse_dry_run_json('{"not": "a list"}') is None
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assert graph.parse_dry_run_json("not json at all") is None
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def test_build_dag_empty_set_yields_no_nodes():
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closure = {"a.drv": {"inputDrvs": {}}, "b.drv": {"inputDrvs": {"a.drv": {}}}}
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preds, nodes = graph.build_dag(closure, set())
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assert nodes == set()
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assert preds == {}
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def test_build_dag_none_costs_whole_closure():
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closure = {
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"a.drv": {"inputDrvs": {}},
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"b.drv": {"inputDrvs": {"/nix/store/x-a.drv": {}}},
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}
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_, nodes = graph.build_dag(closure, None)
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assert nodes == {"a.drv", "b.drv"}
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