Nix on macOS - Public Room Timeline

	Nix on macOS	1178 Members
	“There are still many issues with the Darwin platform but most of it is quite usable.” — http://yves.gnu-darwin.org	192 Servers

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Sender	Message	Time
13 Jun 2021
toonn	What do you think about depending on importing that file as much as possible?	19:32:36
	iammrinal0 joined the room.	20:53:41
LnL	sounds good, you can split it into sdk versions and extras for the old stuff or something	22:02:24
toonn	Oki. nn : )	22:06:46
15 Jun 2021
	abueide joined the room.	05:14:07
abueide	hi everyone. I'm newish to nix. Could some one help me figure out how to get started porting packages to support macos & upstreaming the changes? For example currently I'm trying to add support for qbittorrent which has a macos binary available	05:16:58
abueide	I cloned the nixpkgs repo and I'm looking at the qbittorrent nix file but kind of hard to know where to get started	05:19:22
Stéphan	abueide: Nix typically doesn't use external binaries. I guess the first step is to see why the Nix build fails. In a Nixpkgs checkout, you can do `nix-build -A qbittorrent`. It'll tell you how to circumvent the platform restriction, or you can just remove `platforms = ...` in the file you already found. From there it depends on learning style, I guess? I personally pieced together stuff a lot from the nixos.org manuals and nix pills. 🙂	06:27:45
LnL	I think 3 of the llvm11 builds went through, but then another staging eval came in :p	15:28:17
	Sarah Hodne joined the room.	17:14:12
Sarah Hodne	Hiya, I just tried setting up Nix and nix-darwin on a brand new Big Sur Mac, and it seems the Git in Nix is quite a bit slower than the one installed by Xcode. I'm not entirely sure if this is a Nix thing or something else, but I'm not sure what to debug next. `~ ❯ time /usr/bin/git --version # system git ~ git version 2.30.1 (Apple Git-130) /usr/bin/git --version # system git 0.01s user 0.02s system 51% cpu 0.061 total ~ ❯ time /run/current-system/sw/bin/git --version # nix git ~ git version 2.31.1 /run/current-system/sw/bin/git --version # nix git 0.00s user 0.01s system 1% cpu 1.156 total`	17:15:44
Sarah Hodne	Looks like it may be while loading the libraries: `Total pre-main time: 1.2 seconds (100.0%) dylib loading time: 1.2 seconds (99.5%) rebase/binding time: 0.71 milliseconds (0.0%) ObjC setup time: 0.07 milliseconds (0.0%) initializer time: 4.07 milliseconds (0.3%) slowest intializers : git version 2.31.1`	17:34:16
Sarah Hodne	* Looks like it may be while loading the libraries: `Total pre-main time: 1.2 seconds (100.0%) dylib loading time: 1.2 seconds (99.5%) rebase/binding time: 0.71 milliseconds (0.0%) ObjC setup time: 0.07 milliseconds (0.0%) initializer time: 4.07 milliseconds (0.3%) slowest intializers : git version 2.31.1`	17:34:23
Sarah Hodne	Yeah, setting `DYLD_PRINT_LIBRARIES=1` as well, I see the slowness as it' printing `dyld: loaded: /nix/store/…` lines. Not sure if this is a Nix thing or just a "uses a lot of dylibs" thing	17:46:09
emily	sounds roughly as expected	18:01:11
emily	iirc binary spawning is a little slow on NixOS too due to the linking model	18:01:23
emily	people have thought about optimizing it but I don't think anything's actually made its way upstream	18:01:34
emily	dunno if anyone has done such work for macOS though	18:02:02
toonn	LnL: Hydra's such a cruel mistress, : s	19:51:09
toonn	LnL: Hmm, could use some advice. The updated darwin.hfs is lacking the entire core/ subdirectory. And this is the only bit that was used. Headers with similar names do appear in other subdirectories but they already did in the older hfs. And in the older hfs their contents differs from the ones in core/. Should I refrain from updating this apple_source_release?	20:02:31
LnL	Sarah Hodne: weird, I'd expect the dyld3 caching to apply to everything not just system binaries	20:09:39
LnL	toonn: not sure, depends a bit what we need it for, sometimes stuff disappears or gets moved to other packages some good things to look for it is are the raw sdk and googling with site:opensource.apple.com	20:11:44
toonn	LnL: Hmm, I'm not sure what I'm looking for. Both the SDKs have the headers in the Kernel.framework.	20:59:43
LnL	`site:opensource.apple.com "_HFS_ENCODINGS_H_"` points me to hfs and xnu	21:17:41
LnL	both old however so seems like it was moved somewhere else	21:19:43
toonn	I think it was moved from xnu/bsd/hfs to hfs at some point.	21:54:37
16 Jun 2021
thefloweringash	I expect binary spawning on macos to be similar to regularly compiled programs. In my quick tests, nix git is very similar to apple git (nix is around 5 ms faster). Spending 1.2 seconds in dylib loading is very unusual.	05:53:49
thefloweringash	which revision of nixpkgs is this, maybe something is broken? (`nix-info` will show this)	05:54:39
Sarah Hodne	`❯ nix-info warning: Nix search path entry '/nix/var/nix/profiles/per-user/root/channels' does not exist, ignoring system: "x86_64-darwin", multi-user?: yes, version: nix-env (Nix) 2.3.12, channels(sarah): "darwin, home-manager, nixpkgs", warning: Nix search path entry '/nix/var/nix/profiles/per-user/root/channels' does not exist, ignoring nixpkgs: /Users/sarah/.nix-defexpr/channels/nixpkgs`	07:54:04
Sarah Hodne	`❯ cat ~/.nix-defexpr/channels/nixpkgs/.git-revision 51bb9f3e9ab6161a3bf7746e20b955712cef618b`	07:56:11

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