cmplayer fails to build on Hydra

[Fuuzetsu]

cmplayer fails to build on Hydra because it apparently tries to run waf (http://code.google.com/p/waf/) first. Locally however even though it complains, the nix-build proceeds. This is to discuss this problem. instead of discussing this at #4175

cc @abbradar

[Fuuzetsu]

I'm pretty sure I know how to fix it but I think @abbradar wanted to give it a go. Let me know. I'll fix it by this time tomorrow if I don't hear back.

[abbradar]

I haven't received any notifications about builds failing, in spite of me being a maintainer; shouldn't I?

[abbradar]

Read through logs and checked local env, but can't really get what's going on -- why would "python" be missing in Hydra's env and exist in local --pure shell? I don't have any means for testing on Hydra as far as I understood, but if using something like "python2" would fix this, I would love to get an explanation. Other than that, I have no ideas for now.
Also @Fuuzetsu -- thanks for briefing on Hydra and monitor!

[abbradar]

Just got a notice; earlier question is invalid then.

[domenkozar]

for reference: http://hydra.nixos.org/build/14704016

[Fuuzetsu]

@abbradar you probably need to manually run python waf … in `preConfigure, grep in nixpkgs for examples

[abbradar]

I'll try; this is just very strange that something builds locally, but not
on Hydra. Sign of impurity, perhaps?

[domenkozar]

are you using chroot builds?

[abbradar]

No and I should try. They were too slow for an outdated laptop that I have now; I'll leave this for night.

[abbradar]

It fails on chroot; good, Where do build directories with chroot enabled reside? Ideally I would want to get a shell inside chroot.

[Fuuzetsu]

I wonder if passing -K to nix-build will work for you

[abbradar]

I've missed it, sorry. Let me see... It would be cool however to have some way to get a shell in created chroot environment.

[domenkozar]

Closed via 6ac16b3

[abbradar]

(Sorry that I failed to close it myself -- I have got a sudden big increase of other tasks.)

[abbradar]

Hydra just reported failure to me.

[domenkozar]

As you can see on http://hydra.nixos.org/jobset/nixpkgs/trunk, it still didn't evaluate the commit.

[abbradar]

I wanted to say just that. I have an idea to implement debugging chroots with help of a local ssh server to have a tool similar to nix-shell. I'll try to do this on weekend.

[abbradar]

I can't quite wrap my head around why does your fix work; /usr/bin/env is visible from chroot, as seen from error message; it looks like the python is not in PATH, but why would it be so in chroots? Is this expected behaviour?