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<
samueldr >
(asking here too, in case it gets buried in #nixos)
04:06
<
samueldr >
we might need "the" out again
04:07
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<
gchristensen >
if anyone gets banned by mistake I'll -b them in the morning
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<
Mic92 >
Sonarpulse: hopefully you have luck at the airport then me in the last week. (This message has been postponed on 2017-12-20 21:56:55.)
04:41
<
Sonarpulse >
Mic92: bumped to first row first class for no reason, so I spent all my good airport luck for the decade :)
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<
domenkozar >
can someone tell me if it's possible to switch back and forth with nixUnstable and nix stable?
12:57
<
domenkozar >
(on darwin)
12:57
<
domenkozar >
with regards to schema upgrades, etc
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<
vcunat >
domenkozar: stable should accept the schema used by unstable, for several minor versions already
14:12
<
vcunat >
at least on Linux the switching back and forth does work
14:13
<
vcunat >
(I didn't test Darwin myself, but I expect it to be the same)
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<
domenkozar >
vcunat: thanks
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16:50
<
domenkozar >
debugging multiple outputs with nix 1.11 is so painful
16:50
<
domenkozar >
cycle detected in the references of ‘/nix/store/ilzq2ynwfg4myrl7hf1jk4kz2g5rdwbq-cabal-helper-0.7.3.0-lib’
16:50
<
domenkozar >
I have 6 outputs
16:51
<
clever >
domenkozar: re-run nix-shell against the .drv, then grep for $lib in $out $dev
16:51
<
clever >
then grep for $out in $lib $dev
16:51
<
domenkozar >
1.12 reports what output has the cycle
16:51
<
clever >
and cycle thru each one as the first arg to grep
16:51
<
Dezgeg >
I made a hacky script some time ago that just greps output against other outputs
16:51
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<
vcunat >
domenkozar: the outputs don't get deleted
16:52
<
vcunat >
you can just grep theme
16:52
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16:52
<
vcunat >
(both in 1.11 and 1.12)
16:52
<
clever >
yeah, nix has always done that when builds fail, it leaves the outputs in the store, but not registered as valid
16:53
<
domenkozar >
yeah I went through all combinations
16:53
<
clever >
it also helps for failed fixed-output ones
16:53
<
domenkozar >
and found no cycles
16:53
<
vcunat >
that's weird
16:53
<
Dezgeg >
symlinks then maybe?
16:53
<
domenkozar >
obviously, I fail at grepping
16:53
<
Dezgeg >
instead of file contents
16:53
<
domenkozar >
Dezgeg: hmmmm
16:53
<
domenkozar >
good point
16:53
<
domenkozar >
I'll just upgrade nix
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19:15
<
Sonarpulse >
bgamari: I remebered what it was
19:15
<
Sonarpulse >
for python
19:15
<
Sonarpulse >
there are two setup hooks
19:15
<
Sonarpulse >
one which sets SOURCE_EPOCH_LATEST
19:15
<
Sonarpulse >
or whatever
19:15
<
Sonarpulse >
and one which changes the modified times ensure* something
19:16
<
Sonarpulse >
ensureNewerSourcesHook
19:16
<
Sonarpulse >
the ensure when needs to be set first so the source one is 1980
19:16
<
Sonarpulse >
orivej: I like your name parameter for the setup hooks a lot :)
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20:18
<
bgamari >
why does nix insist on reading input files into memory while hashing?
20:18
<
bgamari >
surely there must be a good reason for it
20:21
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20:24
<
gchristensen >
must there? :)
20:25
<
bgamari >
well, it seems like a large enough limitation that it would have been fixed by now if not
20:26
<
vcunat >
IIRC it was discussed already
20:27
<
vcunat >
I think it was just the simplicity of implementation
20:27
<
vcunat >
(maybe mmapping would help, when I think of it)
20:28
<
bgamari >
well, it seems like streaming shouldn't be
*that* bad, even in C++
20:28
<
bgamari >
the HashSink implementation seems to already support incremental hashing
20:36
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20:41
<
Sonarpulse >
bgamari: nix needs more contributors :(
20:43
<
MichaelRaskin >
Sonarpulse: without an approximate understanding what contributions would get accepted, that won't help.
20:43
<
bgamari >
well, at least I found where this behavior arises from
20:44
<
Sonarpulse >
MichaelRaskin: yeah that's sort of what I mean
20:44
<
Sonarpulse >
blame process, not potential contributors
20:44
<
bgamari >
LocalStore::addToStore is the kye
20:46
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20:56
<
Sonarpulse >
FRidh: ^
20:57
<
bgamari >
good catch
21:04
<
gchristensen >
vcunat: re #32954 is there a path I can test?
21:04
<
vcunat >
gchristensen: I tested in a VM
21:04
<
gchristensen >
yeah but also can I test one? :)
21:04
<
vcunat >
no binaries yet on Hydra
21:05
<
vcunat >
gchristensen: do you have some particular thing you want to test?
21:05
<
vcunat >
dtzWill: ^^ too
21:05
<
vcunat >
I asked on #glibc and re-verified that other assumptions haven't arrived into glibc
21:06
<
gchristensen >
I guess I just want to see it for my own eyes :D
21:06
<
vcunat >
:-) I'll make Hydra build hello
21:06
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<
vcunat >
if we merge soon enough, the binaries will get reused anyway
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21:08
<
gchristensen >
I'm trying to find a way to support mass rebuilds on linux and not macos
21:08
<
gchristensen >
(via ofborg)
21:10
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vcunat >
by "support" you mean doing the rebuilds?
21:10
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bgamari >
Is refactoring the dump utilities in archive.cc to return Sources instead of taking Sinks be a welcome change?
21:11
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gchristensen >
yeah, vcunat
21:11
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bgamari >
it seems like a slightly non-trivial refactoring
21:11
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gchristensen >
there is nothing stopping you from saying `@grahamcofborg build hello` on that PR, it would just be a bit rude to whoevers machine it ends up on :D
21:11
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bgamari >
but it would make streaming content significantly easier
21:12
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gchristensen >
niksnut: you'd need to garner support from niksnut
21:13
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gchristensen >
... bgamari ^
21:13
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bgamari >
Is niksnut edolstra?
21:13
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gchristensen >
yeah
21:16
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vcunat >
Any nontrivial commits to nix repo go through him, I think, and that makes it a bit harder to contribute (than to nixpkgs).
21:17
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21:17
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MichaelRaskin >
The real problem being that he is normally too busy to even reject things in a timely manner.
21:18
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MichaelRaskin >
Detailed review or merging requires some luck…
21:18
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gchristensen >
ah butterflya...
21:18
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contrapumpkin >
given a fixed output hash, is it possible to find derivations in the store that match it? I imagine the db contains the info
21:19
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bgamari >
pbogdan, indeed that's the same issue I was looking at
21:19
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vcunat >
contrapumpkin: maybe grep hash /nix/store/*.drv
21:20
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vcunat >
if the DB contains the hashes, it probably doesn't contain an index over them
21:20
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Sonarpulse >
just by the number of queued builds
21:21
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contrapumpkin >
at least I could do a full table scan :)
21:21
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Sonarpulse >
the python problem could be the last hurdle!
21:21
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gchristensen >
IIRC, hashes generally make poor indexes anyway
21:21
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Sonarpulse >
finally!!
21:21
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vcunat >
contrapumpkin: yes, full table scan might be easier on the I/O than the grep
21:21
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21:22
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vcunat >
gchristensen: crypto-hashes are nice keys for hash tables
21:22
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contrapumpkin >
yeah, not great for b-trees
21:22
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gchristensen >
I'd have to refresh my memory on the specifics of what sqlite uses
21:22
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contrapumpkin >
or rather, you get no locality and need to scan the full hash anyway
21:23
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vcunat >
it's not bad for b-trees and similar structures either, depending on type, if the hashes aren't too long
21:24
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contrapumpkin >
sure, it's not bad, it's just losing out on some of the possible benefits
21:24
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contrapumpkin >
since the ordering property is useless
21:24
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vcunat >
yes, usually it's useless
21:25
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vcunat >
(it's used in DNSSEC, for example)
21:36
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21:48
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vcunat >
gchristensen: done
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22:13
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gchristensen >
oh cool, thank you!
22:21
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22:44
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dtzWill >
gchristensen, vcunat: did 'hello' get cached somewhere? I can try building elsewhere and copying over but it's a bit awkward, so thought I'd ask before spending the cycles O:)
22:46
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dtzWill >
and bootstrap tools should be updated to include this fix, eventually, right? Looks like they're on 2.23 currently
22:47
* dtzWill
comments on relevant PR
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23:35
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gchristensen >
hot dog niksnut you're doing some cool stuff
23:36
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gchristensen >
holy crap
23:36
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23:38
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contrapumpkin >
like what?
23:51
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23:58
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dtzWill >
!! wowza :D