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nixpkgs/nixos/doc/manual/administration/store-corruption.xml
Wilhelm Schuster 5f8d14546b Manual: Explicitly mark commands that require to be run as root (#15589)
* manual: Mark commands that require root

Mark every command that requires to be run as root by prefixing them
with '#' instead of '$'.

* manual: Add note about commands that require root
2016-06-01 15:23:32 +01:00

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<section xmlns="http://docbook.org/ns/docbook"
xmlns:xlink="http://www.w3.org/1999/xlink"
xmlns:xi="http://www.w3.org/2001/XInclude"
version="5.0"
xml:id="sec-nix-store-corruption">
<title>Nix Store Corruption</title>
<para>After a system crash, its possible for files in the Nix store
to become corrupted. (For instance, the Ext4 file system has the
tendency to replace un-synced files with zero bytes.) NixOS tries
hard to prevent this from happening: it performs a
<command>sync</command> before switching to a new configuration, and
Nixs database is fully transactional. If corruption still occurs,
you may be able to fix it automatically.</para>
<para>If the corruption is in a path in the closure of the NixOS
system configuration, you can fix it by doing
<screen>
# nixos-rebuild switch --repair
</screen>
This will cause Nix to check every path in the closure, and if its
cryptographic hash differs from the hash recorded in Nixs database,
the path is rebuilt or redownloaded.</para>
<para>You can also scan the entire Nix store for corrupt paths:
<screen>
# nix-store --verify --check-contents --repair
</screen>
Any corrupt paths will be redownloaded if theyre available in a
binary cache; otherwise, they cannot be repaired.</para>
</section>