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* Troubleshooting information on fixing a b0rked Berkeley DB database.

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This commit is contained in:
Eelco Dolstra 2006-11-30 11:24:10 +00:00
parent 80b742dd52
commit fe15f991e3
3 changed files with 45 additions and 13 deletions
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12
doc/manual/bugs.xml
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@ -15,18 +15,6 @@ generation 43 is created which is a descendant of 39, not 42. So a
rollback from 43 ought to go back to 39. This is not currently
implemented; generations form a linear sequence.</para></listitem>
<listitem><para><emphasis>Build management.</emphasis> In principle it
is already possible to do build management using Nix (by writing
builders that perform appropriate build steps), but the Nix expression
language is not yet powerful enough to make this pleasant (?). The
language should be extended with features from the <link
xlink:href='http://www.cs.uu.nl/~eelco/maak/'>Maak build
manager</link>. Another interesting idea is to write a
<command>make</command> implementation that uses Nix as a back-end to
support <link
xlink:href='http://www.research.att.com/~bs/bs_faq.html#legacy'>legacy</link>
build files.</para></listitem>
<listitem><para>For security, <command>nix-push</command> manifests
should be digitally signed, and <command>nix-pull</command> should
verify the signatures. The actual NAR archives in the cache do not

2
doc/manual/nix-store.xml
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@ -681,7 +681,7 @@ deployment.</para>
<!--######################################################################-->
<refsection><title>Operation <option>--verify</option></title>
<refsection xml:id='refsec-nix-store-verify'><title>Operation <option>--verify</option></title>
<refsection>
<title>Synopsis</title>

44
doc/manual/troubleshooting.xml
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@ -33,6 +33,50 @@ $ rm __db.00*</screen>
</section>
<section><title>Berkeley DB gives weird error messages</title>
<para>Symptom: you get error messages such as
<screen>
Berkeley DB message: Finding last valid log LSN: file: 1 offset 28
Berkeley DB error: file validpaths (meta pgno = 0) has LSN [483][34721].
Berkeley DB error: end of log is [1][28]
Berkeley DB error: /nix/var/nix/db/validpaths: unexpected file type or format</screen>
or other weird Berkeley DB errors, and they don’t away (i.e.,
automatic recovery doesn’t work). This may be the case after a system crash.</para>
<para>Solution: first try to run <command>db_recover</command> and
then <link linkend='refsec-nix-store-verify'><command>nix-store
--verify</command></link>:
<screen>
$ db_recover -h /nix/var/nix/db
$ nix-store --verify</screen>
(Make sure that you have the right version of
<command>db_recover</command>, namely, Berkeley DB 4.4 for Nix 0.10,
and 4.5 for Nix 0.11.)</para>
<para>If that doesn’t work, it’s time to bring out the big guns:
<screen>
$ cd /nix/var/nix
$ cp -pr db db-backup <lineannotation>(making a backup just in case)</lineannotation>
$ cd db
$ rm __db.* log* <lineannotation>(removing the Berkeley DB environment)</lineannotation>
$ mkdir tmp
$ for i in *; do db_dump $i | (cd tmp &amp;&amp; db_load $i); done
<lineannotation>(ignore error messages about non-database files like “reserved”)</lineannotation>
$ mv tmp/* .
$ nix-store --verify</screen>
</para>
</section>
<section><title>Collisions in <command>nix-env</command></title>
<para>Symptom: when installing or upgrading, you get an error message such as