Document some nix-store subcommands
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Eelco Dolstra
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@ -261,6 +261,21 @@ build-use-chroot = /dev /proc /bin</programlisting>
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</varlistentry>
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<varlistentry><term><literal>build-cache-failures</literal></term>
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<listitem><para>If set to <literal>true</literal>, Nix will
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“cache” build failures, meaning that it will remember (in its
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database) that a derivation previously failed. If you then try to
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build the derivation again, Nix will immediately fail rather than
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perform the build again. Failures in fixed-output derivations
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(such as <function>fetchurl</function> calls) are never cached.
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The “failed” status of a derivation can be cleared using
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<command>nix-store --clear-failed-paths</command>. By default,
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failure caching is disabled.</para></listitem>
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</varlistentry>
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<varlistentry><term><literal>system</literal></term>
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<listitem><para>This option specifies the canonical Nix system
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@ -132,7 +132,7 @@ also <xref linkend="sec-common-options" />.</phrase></para>
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<refsection><title>Examples</title>
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<screen>
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$ nix-build pkgs/top-level/all-packages.nix -A firefox
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$ nix-build '<nixpkgs>' -A firefox
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store derivation is /nix/store/qybprl8sz2lc...-firefox-1.5.0.7.drv
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/nix/store/d18hyl92g30l...-firefox-1.5.0.7
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@ -776,6 +776,44 @@ in Nix itself.</para>
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</refsection>
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<!--######################################################################-->
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<refsection><title>Operation <option>--verify-path</option></title>
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<refsection>
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<title>Synopsis</title>
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<cmdsynopsis>
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<command>nix-store</command>
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<arg choice='plain'><option>--verify-path</option></arg>
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<arg choice='plain' rep='repeat'><replaceable>paths</replaceable></arg>
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</cmdsynopsis>
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</refsection>
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<refsection><title>Description</title>
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<para>The operation <option>--verify-paths</option> compares the
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contents of the given store paths to their cryptographic hashes stored
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in Nix’s database. For every changed path, it prints a warning
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message. The exit status is 0 if no path has changed, and 1
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otherwise.</para>
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</refsection>
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<refsection><title>Example</title>
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<para>To verify the integrity of the <command>svn</command> command and all its dependencies:
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<screen>
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$ nix-store --verify-path $(nix-store -qR $(which svn))
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</screen>
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</para>
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</refsection>
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</refsection>
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<!--######################################################################-->
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<refsection xml:id='refsec-nix-store-dump'><title>Operation <option>--dump</option></title>
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@ -1069,6 +1107,122 @@ loads it into the Nix database.</para>
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</refsection>
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<!--######################################################################-->
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<refsection><title>Operation <option>--print-env</option></title>
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<refsection>
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<title>Synopsis</title>
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<cmdsynopsis>
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<command>nix-store</command>
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<arg choice='plain'><option>--print-env</option></arg>
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<arg choice='plain'><replaceable>drvpath</replaceable></arg>
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</cmdsynopsis>
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</refsection>
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<refsection><title>Description</title>
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<para>The operation <option>--print-env</option> prints out the
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environment of a derivation in a format that can be evaluated by a
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shell. The command line arguments of the builder are placed in the
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variable <envar>_args</envar>.</para>
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</refsection>
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<refsection><title>Example</title>
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<screen>
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$ nix-store --print-env $(nix-instantiate '<nixpkgs>' -A firefox)
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<replaceable>…</replaceable>
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export src; src='/nix/store/plpj7qrwcz94z2psh6fchsi7s8yihc7k-firefox-12.0.source.tar.bz2'
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export stdenv; stdenv='/nix/store/7c8asx3yfrg5dg1gzhzyq2236zfgibnm-stdenv'
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export system; system='x86_64-linux'
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export _args; _args='-e /nix/store/9krlzvny65gdc8s7kpb6lkx8cd02c25b-default-builder.sh'
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</screen>
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</refsection>
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</refsection>
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<!--######################################################################-->
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<refsection><title>Operation <option>--query-failed-paths</option></title>
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<refsection>
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<title>Synopsis</title>
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<cmdsynopsis>
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<command>nix-store</command>
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<arg choice='plain'><option>--query-failed-paths</option></arg>
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</cmdsynopsis>
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</refsection>
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<refsection><title>Description</title>
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<para>If build failure caching is enabled through the
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<literal>build-cache-failures</literal> configuration option, the
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operation <option>--query-failed-paths</option> will print out all
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store paths that have failed to build.</para>
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</refsection>
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<refsection><title>Example</title>
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<screen>
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$ nix-store --query-failed-paths
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/nix/store/000zi5dcla86l92jn1g997jb06sidm7x-perl-PerlMagick-6.59
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/nix/store/0011iy7sfwbc1qj5a1f6ifjnbcdail8a-haskell-gitit-ghc7.0.4-0.8.1
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/nix/store/001c0yn1hkh86gprvrb46cxnz3pki7q3-gamin-0.1.10
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<replaceable>…</replaceable>
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</screen>
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</refsection>
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</refsection>
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<!--######################################################################-->
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<refsection><title>Operation <option>--clear-failed-paths</option></title>
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<refsection>
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<title>Synopsis</title>
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<cmdsynopsis>
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<command>nix-store</command>
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<arg choice='plain'><option>--clear-failed-paths</option></arg>
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<arg choice='plain' rep='repeat'><replaceable>paths</replaceable></arg>
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</cmdsynopsis>
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</refsection>
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<refsection><title>Description</title>
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<para>If build failure caching is enabled through the
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<literal>build-cache-failures</literal> configuration option, the
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operation <option>--clear-failed-paths</option> clears the “failed”
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state of the given store paths, allowing them to be built again. This
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is useful if the failure was actually transient (e.g. because the disk
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was full).</para>
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<para>If a path denotes a derivation, its output paths are cleared.
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You can provide the argument <literal>*</literal> to clear all store
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paths.</para>
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</refsection>
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<refsection><title>Example</title>
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<screen>
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$ nix-store --clear-failed-path /nix/store/000zi5dcla86l92jn1g997jb06sidm7x-perl-PerlMagick-6.59
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$ nix-store --clear-failed-path *
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</screen>
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</refsection>
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</refsection>
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<!--######################################################################-->
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<refsection condition="manpage"><title>Environment variables</title>
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<variablelist>
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