mirror of
https://github.com/NixOS/nix.dev.git
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150 lines
4.4 KiB
ReStructuredText
150 lines
4.4 KiB
ReStructuredText
Frequently Asked Questions
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==========================
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Nix
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***
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Secrets?
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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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Try:
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sqlite3 /nix/var/nix/db/db.sqlite "pragma integrity_check"
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Which will print the errors in the database. If the errors are due to missing
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references, the following may work:
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mv /nix/var/nix/db/db.sqlite /nix/var/nix/db/db.sqlite-bkp
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sqlite3 /nix/var/nix/db/db.sqlite-bkp ".dump" | sqlite3 /nix/var/nix/db/db.sqlite
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How do I fix: error: current Nix store schema is version 10, but I only support 7
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---------------------------------------------------------------------------------
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This means you have upgraded Nix sqlite schema to a newer version, but then tried
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to use older Nix.
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The solution is to dump the db and use old Nix version to initialize it:
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::
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/path/to/nix/unstable/bin/nix-store --dump-db > /tmp/db.dump
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mv /nix/var/nix/db /nix/var/nix/db.toonew
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mkdir /nix/var/nix/db
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nix-store --init (this is the old nix-store)
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nix-store --load-db < /tmp/db.dump
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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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How to pin nixpkgs to a specific commit/branch?
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-----------------------------------------------
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-I nixpkgs=http://nixos.org/channels/nixos-16.09/nixexprs.tar.xz
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NIX_PATH=nixpkgs=http://nixos.org/channels/nixos-16.09/nixexprs.tar.xz
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How to build reverse dependencies of a package?
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-----------------------------------------------
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nox-review wip
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I'm getting: writing to file: Connection reset by peer
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------------------------------------------------------
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Too big files in src, out of resources (HDD space, memory)
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What are channels and different branches on github?
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---------------------------------------------------
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Subquestion: how stable is unstable?
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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 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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How can I manage dotfiles in $HOME with Nix?
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--------------------------------------------
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See following solutions:
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- https://github.com/sheenobu/nix-home
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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 time/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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What's the recommended process for building custom packages?
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------------------------------------------------------------
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E.g. if I git clone nixpkgs how do I use the cloned repo to define new / updated packages?
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NixOS
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*****
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How to build my own ISO?
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------------------------
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http://nixos.org/nixos/manual/index.html#sec-building-cd
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How do I mix channels for packages?
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-----------------------------------
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Hydra
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*****
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What to do if cache/hydra is down or unreachable?
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-------------------------------------------------
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Pass following to Nix commands:
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- :option:`--option connect-timeout 5` to wait only 5 second on binary package
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- :option:`--fallback` to build from source if binary package fetching fails
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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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.. code-block:: nix
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trustedBinaryCaches = [ "https://cache.nixos.org" "https://hydra.snabb.co" ];
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binaryCaches = trustedBinaryCaches;
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binaryCachePublicKeys = [ "hydra.snabb.co-1:zPzKSJ1mynGtYEVbUR0QVZf9TLcaygz/OyzHlWo5AMM=" ];
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Using `Nix`:
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.. code-block:: bash
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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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