Without this patch running the following on MacOS:
nix-build release.nix -A build.x86_64-linux
results in the following error during the configuration phase (note that Nix
should be configured with a x86_64-linux build machine):
building '/nix/store/jb6ca1gmplyb69ayd43z7fb0y9npxd53-hydra-0.1.2581.8b5948f4cf12424c04df67a6eb136c9846fb2cfd.drv' on 'ssh://my-linux-build-machine'...
...
checking whether /nix/store/s6bhdppx66bkgf741vk4d29hgsj1h1zp-hydra-perl-deps/bin/nix-store is recent enough... ./configure: line 16254: /nix/store/s6bhdppx66bkgf741vk4d29hgsj1h1zp-hydra-perl-deps/bin/nix-store: cannot execute binary file: Exec format error
no
configure: error: `/nix/store/s6bhdppx66bkgf741vk4d29hgsj1h1zp-hydra-perl-deps/bin/nix-store' doesn't support `--timeout'; please use a newer version.
build time elapsed: 0m1.624s 0m1.774s 0m9.366s 0m6.110s
builder for '/nix/store/jb6ca1gmplyb69ayd43z7fb0y9npxd53-hydra-0.1.2581.8b5948f4cf12424c04df67a6eb136c9846fb2cfd.drv' failed with exit code 1
This problem is that the `nix` dependency of hydra is selected from a nixpkgs
set configured with a default `system` parameter,
i.e. `builtin.currentSystem`. This means that the hydra derivation which is
build for and on Linux depends on the nix derivation build for Darwin.
The fix is to select nix from the nixpkgs set configured with a system specified
by the user.
This reverts commit 949e5865c6. This
makes release.nix harder to read/maintain IMHO. There already is a Nix
expression for Hydra in Nixpkgs that can be used for this purpose.
This rewrites the top-level loop of hydra-evaluator in C++. The Perl
stuff is moved into hydra-eval-jobset. (Rewriting the entire evaluator
would be nice but is a bit too much work.) The new version has some
advantages:
* It can run multiple jobset evaluations in parallel.
* It uses PostgreSQL notifications so it doesn't have to poll the
database. So if a jobset is triggered via the web interface or from
a GitHub / Bitbucket webhook, evaluation of the jobset will start
almost instantaneously (assuming the evaluator is not at its
concurrency limit).
* It imposes a timeout on evaluations. So if e.g. hydra-eval-jobset
hangs connecting to a Mercurial server, it will eventually be
killed.
makeBinPath takes care to use the correct output.
nix-repl> lib.makeSearchPath "bin" [pkgs.nix]
"/nix/store/zpp83pr21ihxwsr15l6mkzwkr49zj71d-nix-1.11.2-dev/bin"
nix-repl> lib.makeBinPath [pkgs.nix]
"/nix/store/9n8c3g541qn43yjjs94f1a0m69wp8scg-nix-1.11.2/bin"
The required configuration in hydra.conf:
enable_google_login = 1
google_client_id = 238429sdjkds....apps.googleusercontent.com
and optionally persona_allowed_domains to restrict to one or more
domains.
