blob: dc0a672d5bd4b0477ed7623772dd4eb9a770f7dc (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
|
<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, it’s 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 Nix’s 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>
<prompt># </prompt>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 Nix’s database, the path is rebuilt or redownloaded.
</para>
<para>
You can also scan the entire Nix store for corrupt paths:
<screen>
<prompt># </prompt>nix-store --verify --check-contents --repair
</screen>
Any corrupt paths will be redownloaded if they’re available in a binary cache; otherwise, they cannot be repaired.
</para>
</section>
|
