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* A command `nix-store --query --roots <paths>' to find the garbage

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collector roots that point (directly or indirectly) to the given
  paths.
This commit is contained in:
Eelco Dolstra 2009-11-23 18:16:25 +00:00
parent ae6bf87273
commit 3d55f1eb57
3 changed files with 53 additions and 32 deletions
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23
doc/manual/nix-store.xml
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@ -404,6 +404,7 @@ error: cannot delete path `/nix/store/zq0h41l75vlb4z45kzgjjmsjxvcv1qk7-mesa-6.4'
<arg choice='plain'><option>--tree</option></arg>
<arg choice='plain'><option>--binding</option> <replaceable>name</replaceable></arg>
<arg choice='plain'><option>--hash</option></arg>
<arg choice='plain'><option>--roots</option></arg>
</group>
<arg><option>--use-output</option></arg>
<arg><option>-u</option></arg>
@ -586,12 +587,20 @@ query is applied to the target of the symlink.</para>
<varlistentry><term><option>--hash</option></term>
<listitem><para>Prints the SHA-256 hash of the contents of the
store path <replaceable>paths</replaceable>. Since the hash is
store paths <replaceable>paths</replaceable>. Since the hash is
stored in the Nix database, this is a fast
operation.</para></listitem>
</varlistentry>
<varlistentry><term><option>--roots</option></term>
<listitem><para>Prints the garbage collector roots that point,
directly or indirectly, at the store paths
<replaceable>paths</replaceable>.</para></listitem>
</varlistentry>
</variablelist>
</refsection>
@ -669,6 +678,18 @@ $ gv graph.ps</screen>
</para>
<para>Show every garbage collector root that points to a store path
that depends on <command>svn</command>:
<screen>
$ nix-store -q --roots $(which svn)
/nix/var/nix/profiles/default-81-link
/nix/var/nix/profiles/default-82-link
/nix/var/nix/profiles/per-user/eelco/profile-97-link
</screen>
</para>
</refsection>