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Logs: liberachat/#haskell

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2021-07-21 14:55:25 <Taneb> Rembane: I think that's what I'm going to end up doing
2021-07-21 14:56:55 h98 joins (~h98@187.83.249.216.dyn.smithville.net)
2021-07-21 14:57:45 <Rembane> Taneb: Good stuff.
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2021-07-21 15:07:07 <delYsid> Does George Wilson show up here at times?
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2021-07-21 15:11:43 <SIben> Hi! I would like to test Haskell code that interacts with the file system (writes files, mainly). Is there a popular way of doing that? The most promising thing I have found thus far is to rewrite functions using a typeclass to constrain a type variable (that would replace IO), and then produce a mock version of it.
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2021-07-21 15:15:33 <ph88_> how can i link with musl instead of glibc ?
2021-07-21 15:16:26 <maerwald> ph88_: alpine
2021-07-21 15:16:27 <yushyin> alpine linux docker image
2021-07-21 15:16:54 <ph88_> can it be done on ubuntu without docker ?
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2021-07-21 15:17:24 <maerwald> yes, but if you ask that question you don't want to do it
2021-07-21 15:17:34 <geekosaur> probably but it won't be easy to guarantee none of glibc gets in
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2021-07-21 15:18:36 <ph88_> is the RTS already precompiled ?
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2021-07-21 15:19:49 <geekosaur> it's more complex than that. (no, it's not already linked against glibc)
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2021-07-21 15:41:34 <ph88_> so do i need ghc itself to be linked to musl to build a static binary with musl ?
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2021-07-21 15:43:35 <geekosaur> no
2021-07-21 15:43:57 <geekosaur> you will just find that glibc is wired in really deep and getting things to not link against it is difficult
2021-07-21 15:44:05 <ph88_> this repo gave me that impression https://github.com/utdemir/ghc-musl "therefore can be used to create fully static Haskell binaries without glibc dependency"
2021-07-21 15:44:17 <ph88_> i don't think that is true either
2021-07-21 15:44:24 <geekosaur> it's far easier to start out with musl as the local libc, hence the docker image containing an OS based on musl
2021-07-21 15:44:44 <maerwald> you don't need that image
2021-07-21 15:44:49 <maerwald> you just need stock alpine image
2021-07-21 15:45:35 <ph88_> strange that the haskell docker image doesn't offer an alpine flavor https://hub.docker.com/_/haskell
2021-07-21 15:45:51 <maerwald> ph88_: just use stock alpine
2021-07-21 15:45:59 <maerwald> and use ghcup to install whatever you need
2021-07-21 15:46:59 <ph88_> what about i take the stock alpine image, and from that create my own Dockerfile that installs stack ?
2021-07-21 15:47:11 <maerwald> ph88_: https://gist.github.com/hasufell/f0893abfbba63ac4ea40feb0520946ee
2021-07-21 15:47:13 <maerwald> example
2021-07-21 15:47:28 <ph88_> i never heard of ghcup before, i only used stack so far
2021-07-21 15:47:28 <maerwald> although that can be simplified further
2021-07-21 15:47:59 <maerwald> ph88_: well, stack doesn't support alpine GHC as much as ghcup does
2021-07-21 15:48:03 <maerwald> unless they fixed it
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2021-07-21 15:48:19 <maerwald> so if you look at the link, it uses both ghcup and stack
2021-07-21 15:48:37 <ph88_> im looking now
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2021-07-21 15:56:52 <ph88_> maerwald, in that Dockerfile you showed i think stack and ghc themselves are linked against musl .. but then they run under ubuntu which uses glibc. I'm confused with that .. i thought i needed to compile in an environment that uses musl
2021-07-21 15:57:16 <maerwald> no, both are linked statically
2021-07-21 15:57:25 <maerwald> that's the point of musl
2021-07-21 15:57:44 <ph88_> sure .. but then you run the statically linked ghc/stack in an glibc environment
2021-07-21 15:57:58 <maerwald> ghc is not statically linked afaik
2021-07-21 15:58:02 <maerwald> stack and ghcup are
2021-07-21 15:58:22 <maerwald> and no, the dockerfile doesn't run musl ghc under glibc
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2021-07-21 15:58:57 <ph88_> so why switch back to ubuntu in that Dockerfile ?
2021-07-21 15:59:29 <maerwald> because alpine is painful for everything else
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2021-07-21 15:59:38 <geekosaur> compiles can be done on the host, only the final link needs to be done with musl
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2021-07-21 16:00:17 <ph88_> the final link would happen in ubuntu no ?
2021-07-21 16:00:29 <geekosaur> no, that gets you glibc
2021-07-21 16:01:01 <ph88_> pretty confusing Dockerfile ^^
2021-07-21 16:02:01 <ph88_> https://gist.github.com/hasufell/f0893abfbba63ac4ea40feb0520946ee#file-dockerfile-L24 seems to have little benefit of having stack, ghcup and code explorer statically linked and then run under ubuntu
2021-07-21 16:02:25 <maerwald> ph88_: huh?
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2021-07-21 16:02:36 <maerwald> how do you build code-explorer statically on ubuntu?
2021-07-21 16:02:54 <ph88_> you don't ? but why build it statically in the first place ?
2021-07-21 16:03:15 <maerwald> no idea, I thought that's what you wanted

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