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68 lines
1.9 KiB
ReStructuredText
68 lines
1.9 KiB
ReStructuredText
Frequently Asked Questions
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==========================
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Nix
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***
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How do I fix: error: querying path in database: database disk image is malformed
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--------------------------------------------------------------------------------
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how nix decides which parts of the environment affect a derivation and its sha256 hash
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--------------------------------------------------------------------------------------
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What are channels and different branches on github?
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---------------------------------------------------
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How do I mirror tarballs?
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-------------------------
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We have a content-addressed tarball mirror at http://tarballs.nixos.org for this
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purpose. "fetchurl" will automatically use this mirror to obtain files by hash.
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However:
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* The mirroring script was not running lately. I've revived it so 16.03 tarballs
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are mirrored now
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(https://github.com/NixOS/nixos-org-configurations/commit/a17ccf87deae4fb86639c8d34ab5938edd68d8c4).
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* The mirroring script only copies tarballs of packages in the Nixpkgs Hydra
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jobset. Since moreutils is not part of the jobset, it's not mirrored. This can
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be fixed by adding a meta.platforms attribute to moreutils.
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Hydra
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*****
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What to do if Hydra is down or unreachable?
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-------------------------------------------
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TODO
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How do I add a new binary cache?
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--------------------------------
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Using `NixOS`:
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TODO
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Using `Nix`:
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```
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$ echo "trusted-binary-caches = https://hydra.snabb.co" >> /etc/nix/nix.conf
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$ nix-build helpers/bench.nix --option extra-binary-caches https://hydra.snabb.co`
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```
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Are there some known impurities in builds?
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------------------------------------------
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Yes.
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- CPU (we try hard to avoid compiling native instructions, but rather hardcode supported ones)
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- current date
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- FileSystem (ext4 has a known bug creating `empty files on power loss <https://github.com/NixOS/nixpkgs/issues/15581>`_)
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- Kernel
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- Timing behaviour of the build system (parallel Make not getting correct inputs in some cases)
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