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* `--min-age' flag in nix-store and nix-collect-garbage to only delete

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unreachable paths that haven't been used for N hours.  For instance,
  `nix-collect-garbage --min-age 168' only deletes paths that haven't
  been accessed in the last week.

  This is useful for instance in the build farm where many derivations
  can be shared between consecutive builds, and we wouldn't want a
  garbage collect to throw them all away.  We could of course register
  them as roots, but then we'd to unregister them at some point, which
  would be a pain to manage.  The `--min-age' flag gives us a sort of
  MRU caching scheme.

  BUG: this really shouldn't be in gc.cc since that violates
  mechanism/policy separation.
This commit is contained in:
Eelco Dolstra 2004-08-25 16:54:08 +00:00
parent fdec72c6cc
commit eb233e728f
6 changed files with 70 additions and 17 deletions
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11
doc/manual/nix-collect-garbage.xml
View file

@ -11,6 +11,7 @@
<arg choice='plain'><option>--print-live</option></arg>
<arg choice='plain'><option>--print-dead</option></arg>
</group>
<arg><option>--min-age</option> <replaceable>age</replaceable></arg>
</cmdsynopsis>
</refsynopsisdiv>
@ -56,6 +57,16 @@
</listitem>
</varlistentry>
<varlistentry>
<term><option>--min-age</option> <replaceable>age</replaceable></term>
<listitem>
<para>
This option corresponds to the <option>--min-age</option>
option in <command>nix-store <option>--gc</option></command>.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsection>

12
doc/manual/nix-store.xml
View file

@ -147,6 +147,7 @@
<arg choice='plain'><option>--print-dead</option></arg>
<arg choice='plain'><option>--delete</option></arg>
</group>
<arg><option>--min-age</option> <replaceable>age</replaceable></arg>
</cmdsynopsis>
</refsection>
@ -207,6 +208,17 @@
Each line should contain exactly one store path.
</para>
<para>
The option <option>--min-age</option> specifies a minimum time
in hours that an unreachable store path must not have been
used before it is considered dead. The default is 0 (consider
all unreachable store paths dead). Whether a store path has
been used is determined by looking at its access time
(<literal>atime</literal>), so this does not work if the store
is located on a file system that has the
<literal>noatime</literal> option set.
</para>
<warning>
<para>
You generally will want to use the command