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700c678c2e
The option '--delete-generations Nd' deletes all generations older than N days. However, most likely the user does not want to delete the generation that was active N days ago. For example, say that you have these 3 generations: 1: <30 days ago> 2: <15 days ago> 3: <1 hour ago> If you do --delete-generations 7d (say, as part of a cron job), most likely you still want to keep generation 2, i.e. the generation that was active 7 days ago (and for most of the past 7 days, in fact). This patch fixes this issue. Note that this also affects 'nix-collect-garbage --delete-older-than Nd'. Thanks to @roconnor for noticing the issue!
67 lines
2.3 KiB
XML
67 lines
2.3 KiB
XML
<refentry xmlns="http://docbook.org/ns/docbook"
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xmlns:xlink="http://www.w3.org/1999/xlink"
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xmlns:xi="http://www.w3.org/2001/XInclude"
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xml:id="sec-nix-collect-garbage">
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<refmeta>
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<refentrytitle>nix-collect-garbage</refentrytitle>
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<manvolnum>1</manvolnum>
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<refmiscinfo class="source">Nix</refmiscinfo>
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<refmiscinfo class="version"><xi:include href="version.txt" parse="text"/></refmiscinfo>
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</refmeta>
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<refnamediv>
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<refname>nix-collect-garbage</refname>
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<refpurpose>delete unreachable store paths</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>nix-collect-garbage</command>
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<arg><option>--delete-old</option></arg>
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<arg><option>-d</option></arg>
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<arg><option>--delete-older-than</option> <replaceable>period</replaceable></arg>
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<group choice='opt'>
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<arg choice='plain'><option>--print-roots</option></arg>
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<arg choice='plain'><option>--print-live</option></arg>
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<arg choice='plain'><option>--print-dead</option></arg>
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<arg choice='plain'><option>--delete</option></arg>
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</group>
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<arg><option>--dry-run</option></arg>
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</cmdsynopsis>
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</refsynopsisdiv>
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<refsection><title>Description</title>
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<para>The command <command>nix-collect-garbage</command> is mostly an
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alias of <link linkend="rsec-nix-store-gc"><command>nix-store
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--gc</command></link>, that is, it deletes all unreachable paths in
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the Nix store to clean up your system. However, it provides two
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additional options: <option>-d</option> (<option>--delete-old</option>),
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which deletes all old generations of all profiles in
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<filename>/nix/var/nix/profiles</filename> by invoking
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<literal>nix-env --delete-generations old</literal> on all profiles
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(of course, this makes rollbacks to previous configurations
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impossible); and
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<option>--delete-older-than</option> <replaceable>period</replaceable>,
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where period is a value such as <literal>30d</literal>, which deletes
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all generations older than the specified number of days in all profiles
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in <filename>/nix/var/nix/profiles</filename> (except for the generations
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that were active at that point in time).
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</para>
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</refsection>
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<refsection><title>Example</title>
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<para>To delete from the Nix store everything that is not used by the
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current generations of each profile, do
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<screen>
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$ nix-collect-garbage -d</screen>
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</para>
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</refsection>
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</refentry>
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