#nix-darwin on 2018-01-23

00:00 <LnL> the fzf-git is some more fancy stuff that you trigger with <Ctrl>gb, <Ctrl>gh, etc.

00:00 <johnw> right now ,if I type git checkout origin/<TAB>, I get the ordinary completion behavior

00:00 <johnw> if i type **<tab>, it just expands out all the files

00:01 <johnw> are fzf-completion and fzf-git mutually exclusive?

00:03 <LnL> no I use them both

00:03 <johnw> hmm

00:03 <johnw> I source fzf-completion in my .zprofile, but it's not getting enabled

00:03 <johnw> even though other things in that file are surely happening

00:03 <LnL> http://files.daiderd.com/store/1wpx6wyhcw79xa8i98pdgksk292z44svis3winyh87rw268qf0hz.png

00:04 <LnL> that's the completion with **<tab>

00:04 <johnw> hmm

00:04 <johnw> for me, **<tab>, anywhere, only completes files

00:04 <johnw> and only after I manually source fzf-completions

00:07 <LnL> weird

00:08 <johnw> in zsh, how do I tell what key is bound to?

00:10 <LnL> bindkey | grep fzf # => "^I" fzf-completion

00:11 <johnw> oh, ^I is not set to fzf

00:11 <johnw> some just have to do some debuggin

00:11 <johnw> g

00:11 <LnL> and for the separate git stuff it's "^Gb" fzf-gitb-widget etc.

00:12 <johnw> ahhh

00:12 <johnw> that's what your ^ meant there

00:12 <johnw> I thought it was part of your search glob

00:13 <LnL> no ctrl :)

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00:17 <LnL> most if it is jut from upstream https://github.com/junegunn/fzf#fuzzy-completion-for-bash-and-zsh

00:22 <johnw> LnL: do you also see this if you use myEnvFun: https://gist.github.com/fc5138365ee4d541a951f43b4c2f527c

00:24 <LnL> don't really use it

00:25 <LnL> do you also get it with my thingy?

00:25 <johnw> haven't tried your thingy yet

00:26 <johnw> LnL: is it ready as a drop-in replacement

00:28 <LnL> depends, it doesn't have some of the arguments like extraCmds

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08:41 <LnL> pjan: ping

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11:27 <parenthetical> Hi, I'm trying to install Nix on OS X and the installer logs me out at some point (just upgraded to High Sierra and same problem). How can I diagnose the problem?

11:29 <LnL> what's the error?

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11:41 <parenthetical> I can't see the error because I'm logged out abruptly during installation

11:44 <LnL> oh

11:44 <LnL> as in the ui crashes?

11:44 <parenthetical> Not logged out actually, but the desktop shell restarts

11:45 <parenthetical> yes

11:45 <LnL> what's your sw_vers -productVersion

11:46 <parenthetical> 10.13.2 but it happened with 10.12 as well

11:46 <LnL> huh

11:47 <LnL> https://github.com/NixOS/nix/issues/1583#issuecomment-343502105

11:47 <LnL> there was a bug in the 10.13 kernel before 10.13.2

11:49 <parenthetical> That's a different issue which I've experienced before on another computer

11:50 <LnL> so it's not that?

11:50 <parenthetical> unfortunately not

11:50 <LnL> can you explain how it's different

11:51 <parenthetical> the other issue locked up

11:52 <parenthetical> this restarts the UI without warning, no errors, nothing, but afterwards things keep working as normal

11:53 <parenthetical> Which users and groups does the install script create?

11:54 <LnL> a nixbld group and a bunch of nixbld1 nixbld2 ... users for the builds

11:55 <LnL> do you see anything useful in the system log?

11:59 <parenthetical> This maybe? com.apple.xpc.launchd[1] (com.apple.xpc.launchd.user.domain.501.100007.Aqua): Caller not allowed to perform action: plugin-containe.1450, action = pid-local registration, code = 1: Operation not permitted, uid = 501, euid = 501, gid = 20, egid = 20, asid = 100007

12:02 <parenthetical> Scratch that, there's actually a crash report

12:04 <parenthetical> Also it's unfortunate that the installer re-downloads the tarball over and over again...

12:05 <parenthetical> Okay, removing the nixbld group and nixbld{1-4} users worked

12:05 <LnL> you can run the installer manually

12:06 <LnL> if you download the latest tarball yourself

12:06 <LnL> wait... that fixed your problem?

12:07 <parenthetical> yep!

12:09 <parenthetical> https://pastebin.com/Wdq9w71r these are the crash logs

12:09 <LnL> ok, I might have an explanation then

12:09 <LnL> but you can’t verify it anymore

12:13 <LnL> did you run a dscl . -read /Groups/nixbld before deleting by any chance?

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12:15 <parenthetical> unfortunately not

12:16 <LnL> well I suspect your user was part of the nixbld group somehow

12:17 <parenthetical> oh, yes I think that's it!

12:17 <parenthetical> why would that result in a crash?

12:17 <LnL> that group is used to run builds as unprivileged users, that's what the nixbld1 ... users are for

12:18 <parenthetical> I didn't realise before that there were users as well as the group

12:18 <LnL> what nix does is kill all of that user's processes when the build finishes to avoid background processes, or things that could influence the next build

12:19 <LnL> you don't want your login user to be one of those :D

12:19 <parenthetical> haha

12:22 <LnL> the kernel bug was actually something similar

12:22 <LnL> the kill syscall that runs as one of the nixbld users would sometimes be able to kill the kernel

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12:24 <LnL> essentially a dos vulnerability since any user could trigger that

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