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Start reference and reorg some of faq
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Domen Kožar
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161
source/faq.rst
161
source/faq.rst
@ -4,8 +4,49 @@ Frequently Asked Questions
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Nix
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***
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Secrets?
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--------
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What to do if a binary cache 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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How do I force nix to re-check whether something exists at a binary cache?
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--------------------------------------------------------------------------
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Nix caches the contents of binary caches so that it doesn't have to query them
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on every command. This includes negative answers (cache doesn't have something).
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The default timeout for that is 1 hour as of writing.
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To wipe all cache-lookup-caches:
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.. code-block:: bash
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$ rm $HOME/.cache/nix/binary-cache-v*.sqlite*
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Alternatively, use the ``narinfo-cache-negative-ttl`` option to reduce the
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cache timeout.
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How do I fix: error: querying path in database: database disk image is malformed
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--------------------------------------------------------------------------------
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@ -44,56 +85,11 @@ The solution is to dump the db and use old Nix version to initialize it:
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nix-store --init (this is the old nix-store)
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nix-store --load-db < /tmp/db.dump
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How nix decides which parts of the environment affect a derivation and its sha256 hash
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--------------------------------------------------------------------------------------
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How to pin nixpkgs to a specific commit/branch?
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-----------------------------------------------
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Ways to provide/pin nixpkgs:
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- ``nix-channel --add URL nixpkgs && nix-channel --update`` sets it globally for the user,
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but it doesn't allow precision (pinning to specific version)
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- As environment variable: ``$NIX_PATH=URL``
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- ``-I`` command line parameter to most of commands like ``nix-build``, ``nix-shell``, etc
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- Using `builtins.fetchTarball <https://nixos.org/nix/manual/#ssec-builtins>`_ function that fetches the channel at evaluation time
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Possible ``URL`` values:
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- Local file path. Using just ``.`` means that nixpkgs is located in current folder.
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- Pinned to a specific commit: ``https://github.com/NixOS/nixpkgs/archive/addcb0dddf2b7db505dae5c38fceb691c7ed85f9.tar.gz``
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- Using latest channel, meaning all tests have passed: ``http://nixos.org/channels/nixos-17.03/nixexprs.tar.xz``
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- Using latest channel, but hosted by github: ``https://github.com/NixOS/nixpkgs-channels/archive/nixos-17.03.tar.gz``
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- Using latest commit for release branch, but not tested yet: ``https://github.com/NixOS/nixpkgs/archive/release-17.03.tar.gz``
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Examples:
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- ``nix-build -I ~/dev``
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- ``nix-build -I ~/dev``
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- ``nix-build -I nixpkgs=http://nixos.org/channels/nixos-17.03/nixexprs.tar.xz``
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- ``NIX_PATH=nixpkgs=http://nixos.org/channels/nixos-17.03/nixexprs.tar.xz nix-build ...``
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- Using just Nix:
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::
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with import (fetchTarball https://github.com/NixOS/nixpkgs-channels/archive/nixos-14.12.tar.gz) {};
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stdenv.mkDerivation { … }
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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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``nix-shell -p nox-review --run "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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@ -103,29 +99,12 @@ 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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See https://nixos.wiki/wiki/Nix_channels
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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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https://github.com/rycee/home-manager
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Are there some known impurities in builds?
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------------------------------------------
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@ -183,51 +162,3 @@ There are a couple of tools:
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- https://github.com/jeaye/nixos-in-place
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- https://github.com/elitak/nixos-infect
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- https://github.com/cleverca22/nix-tests/tree/master/kexec
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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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How do I force nix to re-check whether something exists at a binary cache?
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--------------------------------------------------------------------------
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Nix caches the contents of binary caches so that it doesn't have to query them
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on every command. This includes negative answers (cache doesn't have something).
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The default timeout for that is 1 hour as of writing.
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To wipe all cache-lookup-caches:
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.. code-block:: bash
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$ rm $HOME/.cache/nix/binary-cache-v*.sqlite*
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Alternatively, use the ``narinfo-cache-negative-ttl`` option to reduce the
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cache timeout.
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@ -34,6 +34,7 @@ Table of Contents
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tutorials/index.rst
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anti-patterns/index.rst
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reference/index.rst
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faq.rst
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recommended-reading.rst
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influences.rst
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7
source/reference/index.rst
Normal file
7
source/reference/index.rst
Normal file
@ -0,0 +1,7 @@
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Reference
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=========
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.. toctree::
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:glob:
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pinning-nixpkgs.rst
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40
source/reference/pinning-nixpkgs.rst
Normal file
40
source/reference/pinning-nixpkgs.rst
Normal file
@ -0,0 +1,40 @@
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Pinning Nixpkgs
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===============
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Different ways:
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- As environment variable: ``$NIX_PATH=URL``
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- ``-I`` command line parameter to most of commands like ``nix-build``, ``nix-shell``, etc
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- Using `builtins.fetchTarball <https://nixos.org/nix/manual/#ssec-builtins>`_ function that fetches the channel at evaluation time
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Possible ``URL`` values
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-----------------------
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- Local file path. Using just ``.`` means that nixpkgs is located in current folder.
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- Pinned to a specific commit: ``https://github.com/NixOS/nixpkgs/archive/addcb0dddf2b7db505dae5c38fceb691c7ed85f9.tar.gz``
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- Using latest channel, meaning all tests have passed: ``http://nixos.org/channels/nixos-17.03/nixexprs.tar.xz``
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- Using latest channel, but hosted by github: ``https://github.com/NixOS/nixpkgs-channels/archive/nixos-17.03.tar.gz``
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- Using latest commit for release branch, but not tested yet: ``https://github.com/NixOS/nixpkgs/archive/release-17.03.tar.gz``
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Examples
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--------
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- ``nix-build -I ~/dev``
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- ``nix-build -I ~/dev``
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- ``nix-build -I nixpkgs=http://nixos.org/channels/nixos-17.03/nixexprs.tar.xz``
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- ``NIX_PATH=nixpkgs=http://nixos.org/channels/nixos-17.03/nixexprs.tar.xz nix-build ...``
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- Using just Nix:
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::
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with import (fetchTarball https://github.com/NixOS/nixpkgs-channels/archive/nixos-14.12.tar.gz) {};
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stdenv.mkDerivation { … }
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