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* Document nix-store --delete.

This commit is contained in:
Eelco Dolstra 2006-10-05 23:13:15 +00:00
parent eff573f563
commit beee18de88
2 changed files with 60 additions and 6 deletions
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9
doc/manual/nix-hash.xml
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@ -39,10 +39,11 @@ available as well. The hash is printed in hexadecimal.</para>
<para>The hash is computed over a <emphasis>serialisation</emphasis>
of each path: a dump of the file system tree rooted at the path. This
allows directories and symlinks to be hashed as well as regular files.
The dump is in the <emphasis>NAR format</emphasis> produced by
<command>nix-store</command> <option>--dump</option>. Thus,
<literal>nix-hash <replaceable>path</replaceable></literal> yields the
same cryptographic hash as <literal>nix-store --dump
The dump is in the <emphasis>NAR format</emphasis> produced by <link
linkend="refsec-nix-store-dump"><command>nix-store</command>
<option>--dump</option></link>. Thus, <literal>nix-hash
<replaceable>path</replaceable></literal> yields the same
cryptographic hash as <literal>nix-store --dump
<replaceable>path</replaceable> | md5sum</literal>.</para>
</refsection>

57
doc/manual/nix-store.xml
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@ -256,6 +256,11 @@ and <link
linkend="conf-gc-keep-derivations"><literal>gc-keep-derivations</literal></link>
variables in the Nix configuration file.</para>
<para>With <option>--delete</option>, the collector prints the total
number of freed bytes when it finishes (or when it is interrupted).
With <option>--print-dead</option>, it prints the number of bytes that
would be freed.</para>
</refsection>
@ -264,7 +269,10 @@ variables in the Nix configuration file.</para>
<para>To delete all unreachable paths, just do:
<screen>
$ nix-store --gc</screen>
$ nix-store --gc
deleting `/nix/store/kq82idx6g0nyzsp2s14gfsc38npai7lf-cairo-1.0.4.tar.gz.drv'
<replaceable>...</replaceable>
8825586 bytes freed (8.42 MiB)</screen>
</para>
@ -275,6 +283,51 @@ $ nix-store --gc</screen>
<!--######################################################################-->
<refsection><title>Operation <option>--delete</option></title>
<refsection><title>Synopsis</title>
<cmdsynopsis>
<command>nix-store</command>
<arg choice='plain'><option>--gc</option></arg>
<arg><option>--ignore-liveness</option></arg>
<arg choice='plain' rep='repeat'><replaceable>paths</replaceable></arg>
</cmdsynopsis>
</refsection>
<refsection><title>Description</title>
<para>The operation <option>--delete</option> deletes the store paths
<replaceable>paths</replaceable> from the Nix store, but only if it is
safe to do so; that is, when the path is not reachable from a root of
the garbage collector. This means that you can only delete paths that
would also be deleted by <literal>nix-store --gc</literal>. Thus,
<literal>--delete</literal> is a more targeted version of
<literal>--gc</literal>.</para>
<para>With the option <option>--ignore-liveness</option>, reachability
from the roots is ignored. However, the path still won’t be deleted
if there are other paths in the store that refer to it (i.e., depend
on it).</para>
</refsection>
<refsection><title>Example</title>
<screen>
$ nix-store --delete /nix/store/zq0h41l75vlb4z45kzgjjmsjxvcv1qk7-mesa-6.4
0 bytes freed (0.00 MiB)
error: cannot delete path `/nix/store/zq0h41l75vlb4z45kzgjjmsjxvcv1qk7-mesa-6.4' since it is still alive</screen>
</refsection>
</refsection>
<!--######################################################################-->
<refsection xml:id='refsec-nix-store-query'><title>Operation <option>--query</option></title>
@ -675,7 +728,7 @@ in Nix itself.</para>
<!--######################################################################-->
<refsection><title>Operation <option>--dump</option></title>
<refsection xml:id='refsec-nix-store-dump'><title>Operation <option>--dump</option></title>
<refsection>
<title>Synopsis</title>