curl can't pause downloads of file:// urls, which is very much in the
way of making the curl wrapper fully asynchronous. we can emulate all
the things curl does, but unfortunately curl is *rather extensive* in
its support of frankly weird shit. hopefully this subset of features,
which notably does not include curl readdir support, is enough for us
Change-Id: I5f67768c4b512565655b94b0421270c7dbbd8d11
with the api cleaned up we can suddenly reunify uploads, downloads, and
existence checks through curl in the same wrapper function. uploads and
existence checks simply don't use the result source, and given that all
transfers (or at least *most* transfers to date) go through the network
the few extra allocations do not hurt us at all. even for file:// calls
the overhead won't much matter as going to disk and back *is* expensive
Change-Id: I4f9ca6681a8fc303377b4cf4c63e3363ae32c18b
it's no longer needed. `download` can do everything `enqueueDownload`
did, and a lot more. e.g. not block the calling thread, for instance.
Change-Id: I4b36235ed707c92d117b4c33efa3db50d26f9a84
this will let us return metadata from FileTransfer::download, which in
turn is necessary to remove enqueueDownload. it also opens avenues for
streaming downloads that keep download metadata instead of dropping it
Change-Id: If0fc6af5eb2aeb689fc866c345c9d7bce4d59f2d
let's use the automatic decoding functions curl provides instead of
implementing them ourselves for the dubious ability to support both
xz and bzip2 encodings as well, neither of which anything will send
Change-Id: I3edfebeb596a0e9d5c986efca9270501c996f2dd
etag changing implies with high probability that the content of the
resource changed. immutable url changing implies that the immutable
url we got previously was wrong, which is probably a server bug. if
the encoding changes our decoding will break completely, so that is
also very illegal. one notable change we still allow is etags going
away completely, mostly since this does not imply any data changes.
Change-Id: I0220ceddc3fd732cd1b3bb39b40021cc631baadc
do not retread the entire redirection path if we've seen the end of the
road. this avoids silently downloading wrong data, and notifies us when
a url we've received data from turns into a redirect when retrying. for
reasons of simplicity we don't turn of libcurl redirects on retries. if
we did that we'd have to conditionally process http status codes, which
sounds annoying and would make the header callback even more of a mess.
Change-Id: Ide0c0512ef9b2579350101246d654a2375541a39
this will let us return metadata for a transfer without having to wait
for the entire transfer to complete. more importantly for current uses
though is that we could now send retries to the effective url directly
instead of retreading the entire redirect path. this improves latency,
and in such cases where redirects change while we're downloading it'll
also improve correctness (previously we'd silently download bad data).
Change-Id: I6fcd920eb96fbdb2e960b73773c0b854e0300e99
it's always legal to call curl_multi_remove_handle on a valid pair of
multi and easy handles. removing an easy handle that is not currently
attached to a multi handle is a no-op, and removing an easy handle of
a different multi handle is something we can't reasonably trigger. if
we *did* ever manage it would result in an error we'd ignore, and the
handles in question would not be changed at all. this is just simpler
Change-Id: I85ec62ff89385981ca49d243376b9c32586bd128
return it as a separate item in a pair instead. this will let us remove
enqueueDownload() in favor of returning metadata from download() itself
Change-Id: I74fad2ca15f920da1eefabc950c2baa2c360f2ba
it's just a uri and some headers now. those can be function arguments
with no loss of clarity. *actual* additional arguments, for example a
TLS context with additional certificates, could be added on a new and
improved FileTransfer class that carries not just a backend reference
but some real, visible context for its transfers. curl not being very
multi-threading-friendly when using multi handles will make sharing a
bit hard anyway once we drop the single global download worker thread
Change-Id: Id2112c95cbd118c6d920488f38d272d7da926460
we don't even need this outside of tests. maybe we should not do
automatic retries at this level at all and use retrying wrappers
instead? at some point we may have to do this, but not just yet.
Change-Id: If0088aa55215be81f1770c25b3bb1b5268c65cf8
never set explicitly, and transfers are never instantiated with one
current activity but submitted with a *different* current activity.
Change-Id: I1a3ec57c02013565aeb9e9398ea42d0c4279095e
it's only used by HttpBinaryCacheStore, and even there used in only on
place. this one place can set the header explicitly, which it now does
Change-Id: Id89228150669e25e7f59a3d6bd939e46059ce29e
it only sets the one field anyway (and the parent activity as a side
effect that does not depend on the exact location of the constructor
call). when FileTransferRequest goes away we would need this anyway.
Change-Id: I35cf2ed3533239181449a62cf34cd282b395e5db
this is fragile, slow as fuck, breaks constantly under high concurrency,
and completely unnecessary since ssh bypasses the stdio file descriptors
*anyway*. we do still check that we see ssh messages to ensure that none
of our subprocess handling messes with ssh's /dev/tty, but that's it now
Change-Id: Ib8e31e1999f813d07a27efc63a9d3454a9e4fcdd
* changes:
treewide: make more settings conditionally available
libstore/build: only send overridden settings to the build hook
treewide: consistently mark overridden settings as such
a first little step into pushing the event loops up, up and away.
eventually we will want them to be instantiated only at the roots
of every thread (since kj binds loops to threads), but not today.
Change-Id: Ic97f1debba382a5a3f46daeaf2d6d434ee42569f
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
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
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
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
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
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: lix-project/lix#548
Change-Id: If575aec6b1e27dba63091c7a0316c7b3788747cd
some promises capture `this`. we could also allocate a shared state,
but this thing doesn't really need to ever be moved anyway. so there.
Change-Id: I50b5c44684a8ab4e984b1323de21f97ace4a864a
eldritch horrors
Justin !
Linus Heckemann
raito
alois31
Lily Ballard