Re: Installing ghc-7.10.2 linux binary distro on SuSE

Hi Aycan.. Indeed I was able to use patchelf, so I don't need the LD_PRELOAD trick anymore either. Thanks for the pointer.. As a side note: While I'm impressed with the level of trickery available to inject/remove/change arbitrary functionality to binaries, I'm also surprised to see how easy it would be to insert Trojan-horses on the fly using these mechanisms as well. With "Trusted Haskell" brand, it almost begs the question if GHC should do a "self-check" to make sure it's binary hasn't been mocked up in this way. That would make my life harder of course, but food for thought. -Levent. On Mon, Aug 31, 2015 at 2:44 AM, Aycan iRiCAN wrote:

I'm happy to see it worked. If you want to get rid of LD_PRELOAD, you may use patchelf to modify your binary to inject your fakelib. See 'add-needed' parameter here:

https://github.com/NixOS/patchelf/blob/master/README

On Mon, 31 Aug 2015 01:50 Levent Erkok wrote:

...

Thanks Aycan. The LD_PRELOAD solution did indeed work. I didn't know about that facility before, so I'm pleasantly surprised.

One gotcha though: I had to add the "fake-library" into the runtime as well; with a command that looked like this:

ar q libHsrts_thr.a ghcFakeLib.o

where the libHsrts_thr.a comes from the binary distro, and the ghcFakeLib.o is the object file I got by defining those pthread_setname_np and pthread_getname_np. (They do nothing but return 0.)

Thanks,

-Levent.

On Sun, Aug 30, 2015 at 12:37 AM, Aycan İrican wrote:

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Hi Levent,

For a quick fix, you may want to create a wrapper script which uses LD_PRELOAD to inject `set_threadname_np` to your runtime. An example is given in this blog page:

http://hackerboss.com/overriding-system-functions-for-fun-and-profit/

-aycan

On 30 Aug 2015, at 03:02, Levent Erkok wrote:

I really like the idea of nix. Alas, generating native binaries that can run on SuSE without being in the nix environment is a requirement that's hard to let go. (Everyone in my group would have to start using nix, a tall order.)

Thanks for the advice however, it can indeed come handy for one-off trials if needed. In the meantime, I'm still looking for a binary-linux-distro that doesn't require the set_threadname_np functionality, if anyone can point me in that direction.

Thanks,

-Levent.

On Sat, Aug 29, 2015 at 3:23 PM, Kosyrev Serge < _deepfire@feelingofgreen.ru> wrote:

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Levent Erkok writes:

...

Hello all,

I've been having a lot of trouble installing the binary-distro's on a SuSE machine. Unfortunately, I don't have root privileges and thus my options are rather limited.

The problem seem to boil down to the use of the function pthread_setname_np. It appears the problem was noted before, and Simon Marlow added a corresponding configure check for platforms that do not have this function. See here: https://mail.haskell.org/pipermail/ghc-devs/2014-October/006707.html

Alas, none of the binary distributions listed on https://www.haskell.org/ghc/download_ghc_7_10_2#binaries seem to be built against a system that does not have this function. So, I was unable to install 7.10.2 successfully.

Essentially, I'm looking for a binary distro on SuSE, or with a libc that doesn't have the GNU extensions such as pthread_setname_np; if anyone would be kind enough to put out such a binary distro, that'd really be appreciated.

(Yes, I tried building from the source; but in the corporate environment with so many things controlled, that did not go very far.)

You could try the Nix route, which, conceptually, would boil down to:

1. Installing the Nix package manager into your $HOME on the SuSE system 2. Use Nix to install GHC

Which expands to:

1. Following the instructions at:

https://nixos.org/wiki/How_to_install_nix_in_home_%28on_another_distribution...

2. Invoking:

nix-env -iA haskellPackages.ghc

This would require only HTTP access, which, I presume, should be available within the corporate environment.

All the packages from Hackage can be had precompiled from Nixpkgs, but that's slightly more involved and requires some reading:

http://nixos.org/nixpkgs/manual/#users-guide-to-the-haskell-infrastructure

Should you meet trouble, you can always seek help either at nix-dev@lists.science.uu.nl, or on the #nixos/irc.freenode.net IRC channel -- both have a vibrant nightlife^W Haskell community.

-- с уважениeм / respectfully, Косырев Серёга -- “And those who were seen dancing were thought to be insane by those who could not hear the music.” – Friedrich Wilhelm Nietzsche

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