Lifts the atop subprocess machinery into _usage_report_atop.py: running
atop, streaming its parseable output, building/caching the atop_agg C
helper, and reading its TSV. What stays is record parsing, epoch windows
and per-day merging.
Verified by the 100%-coverage tests from the previous commit. An AST
comparison of all 16 functions against HEAD reports 16 identical, 0
mismatches.
_usage_report_render.py imported _run from the parsing module; it now
imports from the module that owns it. That is the same re-export barrel
the last split shipped and had to fix in a follow-up - caught in the same
commit this time. usage_report.py needed no edit at all.
Both modules hold 100% line+branch (94/28 and 130/34, 0 missed). 179
tests before and after; the five new test files collect 8+6+4+14+5 = 37,
which is last commit's 36 plus the one re-homed out of
test_usage_report_modes.py, where it referenced a constant that had
moved out from under it.
The two test files added last commit were themselves over cap (373, 272)
so they are split five ways here - the DropZone lesson from earlier
today, where a lint fix silently added an over-cap file.
Ran the program: a real report from today's logs, through the native
atop_agg path, which is precisely the code this commit moved.
Over-cap 39 -> 38.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_011w2Pj4Ek3ZNMQVYcFHgXDY
36 tests, no production change - the module is byte-identical to HEAD.
Lands separately from the split that follows, because tests written in
the same commit as a split are written against the post-split shape.
This one mattered more than the last: the uncovered 61% was almost
exactly the code a split would extract - the subprocess plumbing and the
native atop_agg path. Splitting that first would have proved nothing.
_atop_agg_binary had no tests at all; all five outcomes are now covered
(fresh cache, no compiler, make raising, make exiting 0 with no binary,
successful build + chmod). The fresh-cache test asserts by installing a
subprocess.run that fails if called. Every subprocess is faked - no test
spawns atop, make or cc.
Also covers _run's two error paths, _iter_atop_lines with and without a
stdout pipe, the native N/W TSV rows including malformed ones,
_parse_name's six paths, _parse_prm, _window_from_epochs' median
interval, _fold_pid_aggregates, and aggregate_atop end to end.
219 stmts / 62 branches, 0 missed. Directory: 143 -> 179 passing. No
suppressions - two mypy exit-return findings were fixed by typing the
fakes' __exit__ as None rather than silencing them.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_011w2Pj4Ek3ZNMQVYcFHgXDY
