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goals should be considered internal to the worker architecture due to
the tight coupling of the two, and we can finally do that. doing this
is also a prerequisite for turning Worker::run() into a real promise.
Change-Id: I7cf273d4a6fdb75b8d192fce1af07c6265ff6980
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we now do not need the goal pointers any more to process worker results.
Change-Id: I1a021b862ca666bcd23fee9f38973e90e6f94a72
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previously it was possible to fetchurl a dict server, or an ldap server,
or an imap server. this is a bit of a problem, both because rare schemes
may not be available on all systems, and because some schemes (e.g. scp)
are inherently insecure in potentially surprising ways we needn't allow.
Change-Id: I18fc567c6f58c3221b5ea8ce927f4da780057828
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we already have a results type for the entire worker call, we may as
well put this bit of info in there. we do keep the assumption of the
old code that the field will only be read if some goals have failed;
fixing that is a very different mess, and not immediately necessary.
Change-Id: If3fc32649dcd88e1987cdd1758c6c5743e3b35ac
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without this derivations do not show as completely processed in the
internal-json logs (or the newer multiline output). the former also
breaks external tools like nix-output-monitor which, like multiline
output, grow vertically until at least some goals are finally freed
Change-Id: I55758daf526ba29ae15fb82e0d88da8afb45bf5c
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optimise-store.cc used std::regex on darwin, but forgot to include the
header. This probably compiled due to the precompiled headers file, but
it caused errors in the editor.
Change-Id: I23297c08cb66d44e4d4f303560f46e4adc7d5a43
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It's not clear to me if `proc_pidinfo()` or `proc_pidfdinfo()` can
actually return negative values, the syscall wrappers convert `-1` into
zero and the semantics suggest that negative values don't make sense,
but just to be safe we'll preserve the int type until we've checked that
it's a positive value.
Fixes: https://git.lix.systems/lix-project/lix/issues/548
Change-Id: If575aec6b1e27dba63091c7a0316c7b3788747cd
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not doing this can freeze slots until the goal that occupied them is
freed (rather than simply complete), and then can freeze the system.
fixes #549
Change-Id: I042df04222f8ffbaa18ef4a4eae6cbd6f89b679e
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A better fix than in 104448e75d87d03d2fb0b4ac96d4da72e1dae50d, hence a
revert + the fix.
It turns out that this commit has the side-effect that when having e.g.
`StrictHostKeyChecking=accept-new` for a remote builder, the warnings à la
Warning: Permanently added 'builder' (ED25519) to the list of known hosts.
actually end up in the derivation's log whereas hostkey verification
errors don't, but only in the stderr of the `nix-build` invocation
(which was the motivation for the patch).
This change writes the stderr from the build-hook to
* the daemon's stderr, so that the SSH errors appear in the journal
(which was the case before 104448e75d87d03d2fb0b4ac96d4da72e1dae50d)
* the client's stderr, as a log message
* NOT to the drv log (this is handled via `handleJSONLogMessage`)
I tried to fix the issue for legacy-ssh as well, but failed and
ultimately decided to not bother.
I know that we'll sooner or later replace the entire component, however
this is the part of the patch I have working for a while, so I figured I
might still submit it for the time being.
Change-Id: I21ca1aa0d8ae281d2eacddf26e0aa825272707e5
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While debugging something else I observed that latest `main` ignores
`Control-C` on `sudo nix-build`.
After reading through the capnproto docs, it seems as if the promise
must be fulfilled to actually terminate the `promise.wait()` below.
This also applies to scenarios such as stopping the client
(`nix-build`), but the builders on the daemon-side are still running,
i.e. closes #540
Co-authored-by: eldritch horrors <pennae@lix.systems>
Change-Id: I9634d14df4909fc1b65d05654aad0309bcca8a0a
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The approach that was taken here was to add default values to the type
definitions rather than specify them whenever they are missing.
Now the only remaining warning is '-Wunused-parameter' which @jade said
is usually counterproductive and that we can just disable it:
https://git.lix.systems/lix-project/lix/issues/456#issuecomment-6617
So this change adds the flags '-Wall', '-Wextra' and
'-Wno-unused-parameter', so that all warnings are enabled except for
'-Wunused-parameter'.
Change-Id: Ic223a964d67ab429e8da804c0721ba5e25d53012
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Add the compile flag '-Wsign-compare' and adapt the code to fix all
cases of this warning.
Change-Id: I26b08fa5a03e4ac294daf697d32cf9140d84350d
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There was a bug report about a potential call to `memcpy` with a null
pointer which is not reproducible:
https://git.lix.systems/lix-project/lix/issues/492
This occurred in `src/libstore/filetransfer.cc` in `InnerSource::read`.
To ensure that this doesn't happen, an early return is added before
calling `memcpy` if the length of the data to be copied is 0.
This change also adds a test that ensures that when `InnerSource::read`
is called with an empty file, it throws an `EndOfFile` exception.
Change-Id: Ia18149bee9a3488576c864f28475a3a0c9eadfbb
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these two functions are now nearly trivial and much better inline into
makeGoalCommon. keeping them separate also separates information about
goal completion flows and how failure information ends up in `Worker`.
Change-Id: I6af86996e4a2346583371186595e3013c88fb082
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we can use our newfound powers of Goal::work Is A Real Promise to remove
completed goals from continuation promises. apart from being much easier
to follow it's also a lot more efficient because we have the iterator to
the item we are trying to remove, skipping a linear search of the cache.
Change-Id: Ie0190d051c5f4b81304d98db478348b20c209df5
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Goal::work() is a fully usable promise that does not rely on the worker
to report completion conditions. as such we no longer need the `notify`
field that enabled this interplay. we do have to clear goal caches when
destroying the worker though, otherwise goal promises may (incorrectly)
keep goals alive due to strong shared pointers created by childStarted.
Change-Id: Ie607209aafec064dbdf3464fe207d70ba9ee158a
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yet another duplicated field. it's the last one though.
Change-Id: I352df8d306794d262d8c9066f3be78acd40e82cf
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derivation goals still hold a BuildResult member variable since parts of
these results of accumulated in different places, but the Goal class now
no longer has such a field. substitution goals don't need it at all, and
derivation goals should also be refactored to not drop their buildResult
Change-Id: Ic6d3d471cdbe790a6e09a43445e25bedec6ed446
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the field is simply duplicated between the two, and now that we can
return WorkResults from Worker::run we no longer need both of them.
Change-Id: I82fc47d050b39b7bb7d1656445630d271f6c9830
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this will be needed to move all interesting result fields out of Goal
proper and into WorkResult. once that is done we can treat goals as a
totally internal construct of the worker mechanism, which also allows
us to fully stop exposing unclear intermediate state to Worker users.
Change-Id: I98d7778a4b5b2590b7b070bdfc164a22a0ef7190
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since we now propagate goal exceptions properly we no longer need to
check topGoals for a reason to abort early. any early abort reasons,
whether by exception or a clean top goal failure, can now be handled
by inspecting the goal result in the main loop. this greatly reduces
goal-to-goal interactions that do not happen at the main loop level.
since the underscore-free name is now available for use as variables
we'll migrate to that where we currently use `_topGoals` for locals.
Change-Id: I5727c5ea7799647c0a69ab76975b1a03a6558aa6
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drop childException since it's no longer needed. also makes
waitForInput, childFinished, and childTerminated redundant.
Change-Id: I05d88ffd323c5b5c909ac21056162f69ffb0eb9f
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Change-Id: Idd218ec1572eda84dc47accc0dcd8a954d36f098
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there's no reason to have the worker set information on goals that the
goals themselves return from their entry point. doing this in the goal
`work()` function is much cleaner, and a prerequisite to removing more
implicit strong shared references to goals that are currently running.
Change-Id: Ibb3e953ab8482a6a21ce2ed659d5023a991e7923
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this simplifies the worker loop, and lets us remove it entirely later.
note that ideally only one promise waiting for interrupts should exist
in the entire system. not one per event loop, one per *process*. extra
interrupt waiters make interrupt response nondeterministic and as such
aren't great for user experience. if anything wants to react to aborts
caused by explicit interruptions, or anything else, those things would
be much better served using RAII guards such as Finally (or KJ_DEFER).
Change-Id: I41d035ff40172d536e098153c7375b0972110d51
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this was a triumph. i'm making a note here: huge success. it's hard to
overstate my satisfaction! i'm not even angry. i'm being so sincere ri
actually, no. we *are* angry. this was one dumbass odyssey. nobody has
asked for this. but not doing it would have locked us into old, broken
protocols forever or (possibly worse) forced us to write our own async
framework building on the old did-you-mean-continuations in Worker. if
we had done that we'd be locked into ever more, and ever more complex,
manual state management all over the place. this just could not stand.
Change-Id: I43a6de1035febff59d2eff83be9ad52af4659871
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due to event loop scheduling behavior it's possible for a derivation
goal to fully finish (having seen all paths it was asked to create),
but to not notify the worker of this in time to prevent another goal
asking the recently-finished goal for more outputs. if this happened
the finished goal would ignore the request for more outputs since it
considered itself fully done, and the delayed result reporting would
cause the requesting goal to assume its request had been honored. if
the requested goal had finished *properly* the worker would recreate
it instead of asking for more outputs, and this would succeed. it is
thus safe to always recreate goals once they are done, so we now do.
Change-Id: Ifedd69ca153372c623abe9a9b49cd1523588814f
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This splits `ignoreException` into `ignoreExceptionExceptInterrupt`
(which ignores all exceptions except `Interrupt`, which indicates a
SIGINT/CTRL-C) and `ignoreExceptionInDestructor` (which ignores all
exceptions, so that destructors do not throw exceptions).
This prevents many cases where Nix ignores CTRL-C entirely.
See: https://github.com/NixOS/nix/issues/7245
Upstream-PR: https://github.com/NixOS/nix/pull/11618
Change-Id: Ie7d2467eedbe840d1b9fa2e88a4e88e4ab26a87b
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Change-Id: Ic2f7bc2bd6a1879ad614e4be81a7214f64eb0e85
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Change-Id: I2d4dcedff0a278d2d8f3d264a9186dfb399275e2
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Change-Id: I38cfe8c7059251b581f1013c4213804f36b985ea
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we'll now loop to update displayed statistics, and use this loop to
limit the update rate to 50 times per second. we could have updated
much more frequently before this (once per iteration of `runImpl`),
much faster than would ever be useful in practice. aggressive stats
updates can even impede progress due to terminal or network delays.
Change-Id: Ifba755a2569f73c919b1fbb06a142c0951395d6d
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Worker::run() is now entirely based on the kj event loop and promises,
so we need not handle awakeness of goals manually any more. every goal
can instead, once it has finished a partial work call, defer itself to
being called again in the next iteration of the loop. same end effect.
Change-Id: I320eee2fa60bcebaabd74d1323fa96d1402c1d15
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notably we will check whether we want to do GC at all only once during
startup, and we'll only attempt GC every ten seconds rather than every
time a goal has finished a partial work call. this shouldn't cause any
problems in practice since relying on auto-gc is not deterministic and
stores in which builds can fill all remaining free space in merely ten
seconds are severely troubled even when gargage collection runs a lot.
Change-Id: I1175a56bf7f4e531f8be90157ad88750ff2ddec4
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Change-Id: Ib112ea9a3e67d5cb3d7d0ded30bbd25c96262470
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Change-Id: I8355d8d3f6c43a812990c1912b048e5735b07f7b
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Revert submission 1946
Reason for revert: regression in building (found via bisection)
Reported by users:
> error: path '/nix/store/04ca5xwvasz6s3jg0k7njz6rzi0d225w-jq-1.7.1-dev' does not exist in the store
Reverted changes: /q/submissionid:1946
Change-Id: I6f1a4b2f7d7ef5ca430e477fc32bca62fd97036b
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nothing needs to signal being still active but not actively pollable,
only that immediate polling for the next goal work phase is in order.
Change-Id: Ia43c1015e94ba4f5f6b9cb92943da608c4a01555
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this was immensely inefficient on large caches, as can exist when many
derivations are buildable simultaneously. since we have smart pointers
to goals we can do cache maintenance in goal deleters instead, and use
the exact iterators instead of doing a linear search. this *does* rely
on goals being deleted to remove them from the cache, which isn't true
for toplevel goals. those would have previously been removed when done
in all cases, removing the cache entry when keep-going is set. this is
arguably incorrect since it might result in those goals being retried,
although that could only happen with dynamic derivations or the likes.
(luckily dynamic derivations not complete enough to allow this at all)
Change-Id: I8e750b868393588c33e4829333d370f2c509ce99
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makeDerivationGoalCommon had the right idea, but it didn't quite go far
enough. let's do the rest and remove the remaining factory duplication.
Change-Id: I1fe32446bdfb501e81df56226fd962f85720725b
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this was a debugging aid from day one that should not have any impact on
build semantics, and if it *does* have an impact on build semantics then
build semantics are seriously broken. keeping the order imposed by these
keys will be impossible once we let a real event loop schedule our jobs.
Change-Id: I5c313324e1f213ab6453d82f41ae5e59de809a5b
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without circular references we do not need weak goal pointers except for
caches, which should not prevent goal destructors running. caches though
cannot create circular references even when they keep strong references.
if we removed goals from caches when their work() is fully finished, not
when their destructors are run, we could keep strong pointers in caches.
since we do not gain much from this we keep those pointers weak for now.
Change-Id: I1d4a6850ff5e264443c90eb4531da89f5e97a3a0
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have DerivationGoal and its subclasses produce a wrapper promise for
their intermediate results instead, and return this wrapper promise.
Worker already handles promises that do not complete immediately, so
we do not have to duplicate this into an entire result type variant.
Change-Id: Iae8dbf63cfc742afda4d415922a29ac5a3f39348
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the new event loop could very occasionally notice that a dependency of
some goal has failed, process the failure, cause the depending goal to
fail accordingly, and in the doing of the latter two steps let further
dependencies that previously have not been reported as failed do their
reporting anyway. in such cases a goal could fail with "1 dependencies
failed", but more than one dependency failure message was shown. we'll
now report the correct number of failed dependency goals in all cases.
Change-Id: I5aa95dcb2db4de4fd5fee8acbf5db833531d81a8
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these can be unique rather than shared because shared_ptr has a
converting constructor. preparatory refactor for something else
and not necessary on its own, and the extra allocations we must
do for shared_ptr control blocks isn't usually relevant anyway.
Change-Id: I5391715545240c6ec8e83a031206edafdfc6462f
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also gets rid of explicit strong references to dependencies of any goal,
and weak references to dependers as well. those are now only held within
promises representing goal completion and thus independent of the goal's
relation to each other. the weak references to dependers was only needed
for notifications, and that's much better handled entirely by kj itself.
Change-Id: I00d06df9090f8d6336ee4bb0c1313a7052fb016b
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now that we have an event loop in the worker we can use it and its
magical execution suspending properties to replace the slot counts
we managed explicitly with semaphores and raii tokens. technically
this would not have needed an event loop base to be doable, but it
is a whole lot easier to wait for a token to be available if there
is a callback mechanism ready for use that doesn't require a whole
damn dedicated abstract method in Goal to work, and specific calls
to that dedicated method strewn all over the worker implementation
Change-Id: I1da7cf386d94e2bbf2dba9b53ff51dbce6a0cff7
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with waitForAWhile turned into promised the core functionality of
waitForInput is now merely to let gc run every so often if needed
Change-Id: I68da342bbc1d67653901cf4502dabfa5bc947628
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