| Commit message (Collapse) | Author | Age | Files | Lines |
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The race detector found my own new flag: Apply writes it on a worker
and Close reads it from the main loop. The test was polling a plain
field too, where the real window hears about the apply on the main
loop, which orders the writes.
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Folding is the expensive half of a name test on a name with diacritics,
and every name test of every rule folded the same name again: on Polish
names it was most of the matching work. The per-file facts memoise it,
which is where one file's work belongs - the object is per file and per
goroutine, so no lock.
4000 Polish names, twelve rules with name tests: 0.33s -> 0.13s
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Five of the Settings window's controls - the sort order, the three
column toggles and the preview height - were read when it built its new
preferences but never connected to anything, so changing them did
nothing until some other control happened to fire, and then they all
landed at once out of nowhere. Every control is connected now.
The same closure composed a whole Prefs from its own widgets, which
wrote the remembered divider positions back as zeros: dragging the
panes to taste and then ticking any checkbox threw them away. A
settings change is now applied over the preferences as they are, by
model.Prefs.WithDisplay - which is where it can be tested, and is.
"Keep this copy, replace the other" wrote a Displaces straight into the
chain. internal/plan refuses to build two steps that displace one path,
because the second destroys what the first put there; the window went
round that code, so choosing it for two duplicates of one file left
both rows saying "done" with the first file in the Trash. It now
refuses the second, naming the file that has the place.
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A form's span was whole lines, which is wrong the moment two forms
share one.
Delete: "(exclude A) (exclude B)" on one line, delete the first, both
went. The dialog named one. The file still parsed, the live check said
no errors and Save lit, so an exclusion could disappear silently and
the next run would sort the files it had been protecting.
Clear a setting: the same shape, and the Settings window walked into it
itself - it writes "(defaults\n (case ignore))", so the closing paren
of defaults sits on the setting's line, and putting that setting back
to "default" deleted the line and broke the file it had just written.
Every later change then silently reverted until Settings was reopened.
A hand-written "(defaults (case ignore) (fold yes))" lost fold the same
way, and that one still loaded, so it was saveable.
Both now take the whole line only when the line holds nothing else, and
otherwise take the form and the spaces after it. One helper, used by
the main file and by a directory's settings alike.
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Close releases the directory lock and closes the log. The window could
reach it while an apply was still running - saving rules, saving
settings, adding a directory, or closing the window - and the engine
then went on moving files with the log shut underneath: a file moved
that no krino undo can see, the rest of the plan silently abandoned,
and the directory unlocked while krino was still working in it.
PlanTab and UndoTab refuse to close while their apply is in flight
(model.ErrApplying), the window's close request and reloadEngine honour
the refusal instead of ignoring it, and the tabs and Settings are greyed
out for the duration so a button that cannot work says so by being
unavailable rather than by an error afterwards.
The test starts an apply, calls Close from another goroutine while it
is in flight, and requires the refusal.
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max-read gates on file size before reading, then the text was read
whole and decoded: a file that is not valid UTF-8 decodes one byte per
code point and doubles, and normalising and folding copy that again per
set of options, with GOMAXPROCS files in flight. Twelve 40 MB files
reached 3.3 GB - enough to put a laptop into the OOM killer, with no
attacker involved, just a few big .log or .csv files.
Two bounds. The decoded text is cut to max-read at a rune boundary, so
the ceiling means what a reader takes it to mean. And extraction of
files at or above 4 MiB is rationed to two at a time, since holding
several large texts at once is what multiplies the ceiling; smaller
files, which is nearly all of them, are untouched.
twelve 40 MB files: peak RSS 3294 MB -> 728 MB, wall 27s -> 46s
two thousand small files: 0.05s both ways
The wall-clock cost falls entirely on large files needing extraction,
and buys a program that finishes instead of being killed.
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The clock was read once per directory, so a run of several directories
stamped several different times - and a review that took a few seconds
could put one run's files into two folders, or at midnight two dates.
The spec (§7.3) says "the start of the run"; krino.conf(5) documented
the behaviour rather than the intent, so the two contradicted each
other.
The session now carries the run's clock and every directory plans with
it. Engine.Plan keeps its meaning for a caller with no session of its
own; Session.Plan passes the run's own start.
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Placeholders were already stopped from sending a file out of the
directory a rule named. A symlink is a name too, and the directory
krino sorts is by the threat model's own premise a place the internet
writes into: a link named after a rule's destination sent moves and
copies anywhere, and under (on-conflict overwrite) trashed a file
OUTSIDE the sorted directory - while the plan showed the in-tree text
and the run reported success.
A step whose destination passes through a symlink at or below the
directory being sorted now fails. A destination the configuration names
outside it - ~/docs on another disk - is the user's own arrangement and
is followed as before; both cases have a test.
End to end, the review's scenario (Out -> ~/secret, overwrite):
before: 1 applied, the user's file replaced and trashed
after: 0 applied 1 failed, the file untouched, nothing trashed
Two bookkeeping bugs in MkdirAllTracked went with it: a dangling
symlink read as a missing directory and was then recorded as one krino
had created - undo would have unlinked a link krino never made - and a
directory created by someone else between the check and the mkdir was
recorded the same way.
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The scopes that drive "no rule deletes a file krino found to be a
duplicate" were collected from rules only. A directory whose duplicate
tests lived in (exclude ...) forms had no scopes at all, so the
protection never engaged: krino explain said "yes duplicate" and the
next rule permanently deleted every copy. The README's promise was
false in that shape, and the spec's wording permitted it.
What matters is what krino knows, not which form taught it. The spec
and krino.conf(5) now say so too.
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(on-conflict overwrite) trashes the file in the way; §7.4 promises undo
restores it. Walking a file's log entries stopped dead at a permanent
delete, so the displace written earlier in the same chain was never
reached: the user's file stayed in the Trash, the refusal named only
the file they did not care about, and krino log called the run undone.
The displaced file is a different file, so it is offered as its own
entry in the undo plan, keyed by its own path - the deleted file stays
refused, since nothing of it can come back, and the copy or move that
preceded the delete stays unreversed too (undoing a copy whose original
was then deleted would destroy the last remaining copy).
The accounting matched: every reversible step of a deleted file was
subtracted, its displace included, so the run read (undone). Only what
genuinely cannot come back is subtracted now.
End to end, the scenario from the review: the only copy of a file is
displaced by an incoming one that is then permanently deleted.
before: archive/ empty, "(undone)", nothing offered
after: archive/a.pdf restored, run reads partly undone
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The displace was carried out first and logged only when the whole step
finished - for a copy or a cross-device move, the entire data transfer
later. A process killed in that window left the user's file in the
Trash with nothing recording it: krino log said "nothing applied" and
undo offered nothing.
It is its own action with its own line (spec §9), so it is now written
the moment trash.Put returns, through a hook ChainLogged calls before
the step that needed the name begins. A displace that cannot be logged
fails the step rather than compounding an unrecorded destructive act
with a second one.
Verified by killing krino -9 mid-copy with 600 MB in flight:
before: krino log "nothing applied", 0 displace lines
after: krino log "1 displaced", 1 displace line
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Every file renamed onto one name probed stem_1, stem_2, ... from the
beginning, so N files cost N^2/2 Exists calls - a test here counts 1890
of them for 60 files. The search now continues from the highest suffix
already tried for that stem.
Within one plan that is the same answer: the taken set only grows while
a plan is built and the disk is not being written to, so a suffix taken
once stays taken. Proved rather than argued - with same_1 and same_3
already on disk and same_2 free, both versions put a file in the gap,
and the two plans are byte-identical.
1500 files renamed to one name: 2.63s -> 0.05s
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Lookup walked the whole size group for every file in it, so N copies of
one file cost N walks of an N-member group, each taking the index's
lock at every step - which is why more workers made it slower rather
than faster. Every member of a class elects the same original (the
invariant identicalTo already documents and a test already pins), so
the class is memoised on the first walk and every later member is a
map lookup.
Measured over identical files, invented data, same machine:
500 files 0.17s -> 0.12s
2000 files 1.89s -> 0.58s
and the plans are byte-identical once the sandbox path is normalised.
The test counts walks: one per content class, not one per file.
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flock(2) on the lock file's descriptor replaces "write my pid, and
decide whether the pid in the file is still alive". The kernel drops
the lock when the process ends, however it ends, so there is no stale
krino lock to detect and no takeover to race over.
What that fixes:
- Two runs that both judged a lock stale could remove and recreate it
and both believe they held it. Remove-then-create cannot be made
atomic; there is nothing to make atomic now. Pinned by a test with
eight callers over twenty rounds.
- A pid reused after a crash made the lock live for ever, and the
message named neither the file nor the pid, so there was nothing to
act on. The message now names both.
- Signal(0) reads EPERM as "not running", so a lock held by another
user was taken over. There is no such judgement left to get wrong.
A run that waits for a held lock now says so first. Waiting is what
the spec asks for, but the wait has no timeout, and in silence it is
indistinguishable from a hang - I spent two minutes on one myself
today, waiting on a lock the window was holding.
Tests that faked a held lock by writing a file now hold a real one.
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So that go install can find it. cgit serves no go-import meta tag, so
nginx answers a ?go-get=1 request for /NAME with one pointing at
https://git.labunix.xyz/NAME.git; the alternative was carrying a .git
suffix through every import line forever.
One sed over the imports, both go.mod files, and the dependency gate's
whitelist. Nothing else depends on the path. go install works from the
next tag, the first release whose go.mod carries it.
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https://git.labunix.xyz/krino.git, on cgit and clonable without an
account. About shows it and the README's status says how to clone;
go install still needs a module path that is a URL.
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The same address the commits are authored from, rather than a second
one to keep working.
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About 340 comments cited the development process: task and plan
numbers, fix waves, rulings, reviewers, and the author in the third
person with a date. None of that exists outside the work itself, so to
a reader it pointed at nothing. Each one now states the engineering
reason it was standing in front of; where a comment was provenance and
nothing else, it is gone.
References to docs/design.md and docs/gui-design.md by section stay:
both ship with the repository. The design documents lose their
amendment diaries - CHANGELOG.md is that record - and the GUI's says
plainly that the window has gone further than the document.
Only comments changed. Every .go file was parsed and its code printed
with comments stripped, before and after: the two hashes are identical
across all 175 files.
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It opened with a paragraph of version history and spent 148 of its 273
lines on a walkthrough. What sells the program is a rules file and the
plan it produces, so those come first, with a screenshot of the window
above them.
Every command and every pasted line was run again in a scratch config:
the plan, the apply, the log line and the undo are this morning's real
output, and the example rules file passes krino check as written (with
the paths pointed at a sandbox).
docs/krino-gui.png is from invented files under /tmp/krino-demo.
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Squeezed, the toolbar's path label read "/t... ds". It now elides the
start, since the end of a path is the part that says which directory
this is, and will not shrink below about sixteen characters; the
tooltip still holds it in full.
The checklist gains the reordered bar, the About block, and the
sandbox trap that had every file skipped: krino's own (min-age 2m)
ignores a file written in the last two minutes.
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The Plan bar now reads left to right as the work does: which
directory, how it should be listed, what of it, where it is on disk -
then Scan, and only then what to do with what came back. Scan carries
the theme's accent, being the button that starts everything.
Settings ends with About: the program and the version it was built
as, what it is in a sentence, the licence, and who to write to. The
text is model.About so it is tested; ui.Version is stamped by main.
leak-check knows krino's own contact address, so the address check
stays useful without a per-clone setting.
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Selecting the exclude row in Forms panicked: newFormEditor read the
form's rule for its when, name, action and stop, and an exclude has
only the when. The editor now takes the conditions from whichever of
the two the form holds and leaves out the fields an exclude has not
got. Checklist item 49 covers it.
Also the 0.0.11 changelog and README, and header floors wide enough
that the age heading is not clipped.
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explanation
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setting
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list labels after an edit
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one file are
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own, overrides keyed by clean path, splice and enum guards
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