nix-instantiate: Add a flag --expr / -E to read expressions from the command line
This is basically a shortcut for ‘echo 'expr...' | nix-instantiate -’. Also supported by nix-build and nix-shell.
This commit is contained in:
parent
e707a8a526
commit
c31836008e
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@ -164,6 +164,16 @@ $ nix-build '<nixpkgs>' -A openssl.man
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</screen>
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</screen>
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This will create a symlink <literal>result-man</literal>.</para>
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This will create a symlink <literal>result-man</literal>.</para>
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<para>Build a Nix expression given on the command line:
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<screen>
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$ nix-build -E 'with import <nixpkgs> { }; runCommand "foo" { } "echo bar > $out"'
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$ cat ./result
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bar
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</screen>
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</para>
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</refsection>
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</refsection>
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@ -18,7 +18,15 @@
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<refsynopsisdiv>
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<refsynopsisdiv>
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<cmdsynopsis>
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<cmdsynopsis>
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<command>nix-instantiate</command>
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<command>nix-instantiate</command>
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<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="opt-common-syn.xml#xmlns(db=http://docbook.org/ns/docbook)xpointer(/db:nop/*)" />
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<group>
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<arg choice='plain'><option>--parse-only</option></arg>
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<arg choice='plain'>
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<option>--eval-only</option>
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<arg><option>--strict</option></arg>
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<arg><option>--xml</option></arg>
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</arg>
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</group>
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<arg><option>--read-write-mode</option></arg>
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<arg><option>--arg</option> <replaceable>name</replaceable> <replaceable>value</replaceable></arg>
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<arg><option>--arg</option> <replaceable>name</replaceable> <replaceable>value</replaceable></arg>
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<arg>
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<arg>
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<group choice='req'>
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<group choice='req'>
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@ -29,18 +37,14 @@
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</arg>
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</arg>
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<arg><option>--add-root</option> <replaceable>path</replaceable></arg>
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<arg><option>--add-root</option> <replaceable>path</replaceable></arg>
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<arg><option>--indirect</option></arg>
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<arg><option>--indirect</option></arg>
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<arg>
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<group choice='req'>
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<group choice='req'>
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<arg choice='plain'><option>--parse-only</option></arg>
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<arg choice='plain'><option>--expr</option></arg>
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<arg choice='plain'>
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<arg choice='plain'><option>-E</option></arg>
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<option>--eval-only</option>
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<arg><option>--strict</option></arg>
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<arg><option>--read-write-mode</option></arg>
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</arg>
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<arg choice='plain'><option>--find-file</option></arg>
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</group>
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</group>
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<arg><option>--xml</option></arg>
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<arg choice='plain' rep='repeat'><replaceable>files</replaceable></arg>
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</arg>
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<sbr/>
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<command>nix-instantiate</command>
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<arg choice='plain'><option>--file-file</option></arg>
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<arg choice='plain' rep='repeat'><replaceable>files</replaceable></arg>
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<arg choice='plain' rep='repeat'><replaceable>files</replaceable></arg>
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</cmdsynopsis>
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</cmdsynopsis>
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</refsynopsisdiv>
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</refsynopsisdiv>
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@ -50,8 +54,8 @@
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<para>The command <command>nix-instantiate</command> generates <link
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<para>The command <command>nix-instantiate</command> generates <link
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linkend="gloss-derivation">store derivations</link> from (high-level)
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linkend="gloss-derivation">store derivations</link> from (high-level)
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Nix expressions. It loads and evaluates the Nix expressions in each
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Nix expressions. It evaluates the Nix expressions in each of
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of <replaceable>files</replaceable> (which defaults to
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<replaceable>files</replaceable> (which defaults to
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<replaceable>./default.nix</replaceable>). Each top-level expression
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<replaceable>./default.nix</replaceable>). Each top-level expression
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should evaluate to a derivation, a list of derivations, or a set of
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should evaluate to a derivation, a list of derivations, or a set of
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derivations. The paths of the resulting store derivations are printed
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derivations. The paths of the resulting store derivations are printed
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@ -61,12 +65,6 @@ on standard output.</para>
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<literal>-</literal>, then a Nix expression will be read from standard
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<literal>-</literal>, then a Nix expression will be read from standard
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input.</para>
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input.</para>
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<para>Most users and developers don’t need to use this command
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(<command>nix-env</command> and <command>nix-build</command> perform
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store derivation instantiation from Nix expressions automatically).
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It is most commonly used for implementing new deployment
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policies.</para>
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<para condition="manual">See also <xref linkend="sec-common-options"
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<para condition="manual">See also <xref linkend="sec-common-options"
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/> for a list of common options.</para>
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/> for a list of common options.</para>
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@ -86,7 +84,6 @@ policies.</para>
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</varlistentry>
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</varlistentry>
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<varlistentry><term><option>--parse-only</option></term>
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<varlistentry><term><option>--parse-only</option></term>
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<listitem><para>Just parse the input files, and print their
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<listitem><para>Just parse the input files, and print their
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@ -180,19 +177,34 @@ dr-xr-xr-x 2 eelco users 4096 1970-01-01 01:00 lib
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</para>
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</para>
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<para>You can also give a Nix expression on the command line:
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<screen>
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$ nix-instantiate -E 'with import <nixpkgs> { }; hello'
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/nix/store/j8s4zyv75a724q38cb0r87rlczaiag4y-hello-2.8.drv
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</screen>
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This is equivalent to:
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<screen>
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$ nix-instantiate '<nixpkgs>' -A hello
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</screen>
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</para>
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<para>Parsing and evaluating Nix expressions:
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<para>Parsing and evaluating Nix expressions:
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<screen>
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<screen>
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$ echo '"foo" + "bar"' | nix-instantiate --parse-only -
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$ nix-instantiate --parse-only -E '1 + 2'
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OpPlus(Str("foo"),Str("bar"))
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1 + 2
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$ echo '"foo" + "bar"' | nix-instantiate --eval-only -
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$ nix-instantiate --eval-only -E '1 + 2'
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Str("foobar")
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3
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$ echo '"foo" + "bar"' | nix-instantiate --eval-only --xml -
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$ nix-instantiate --eval-only --xml -E '1 + 2'
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<![CDATA[<?xml version='1.0' encoding='utf-8'?>
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<![CDATA[<?xml version='1.0' encoding='utf-8'?>
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<expr>
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<expr>
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<string value="foobar" />
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<int value="3" />
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</expr>]]></screen>
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</expr>]]></screen>
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</para>
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</para>
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@ -200,7 +212,7 @@ $ echo '"foo" + "bar"' | nix-instantiate --eval-only --xml -
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<para>The difference between non-strict and strict evaluation:
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<para>The difference between non-strict and strict evaluation:
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<screen>
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<screen>
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$ echo 'rec { x = "foo"; y = x; }' | nix-instantiate --eval-only --xml -
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$ nix-instantiate --eval-only --xml -E 'rec { x = "foo"; y = x; }'
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<replaceable>...</replaceable><![CDATA[
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<replaceable>...</replaceable><![CDATA[
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<attr name="x">
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<attr name="x">
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<string value="foo" />
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<string value="foo" />
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@ -214,7 +226,7 @@ Note that <varname>y</varname> is left unevaluated (the XML
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representation doesn’t attempt to show non-normal forms).
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representation doesn’t attempt to show non-normal forms).
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<screen>
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<screen>
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$ echo 'rec { x = "foo"; y = x; }' | nix-instantiate --eval-only --xml --strict -
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$ nix-instantiate --eval-only --xml --strict -E 'rec { x = "foo"; y = x; }'
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<replaceable>...</replaceable><![CDATA[
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<replaceable>...</replaceable><![CDATA[
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<attr name="x">
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<attr name="x">
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<string value="foo" />
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<string value="foo" />
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@ -61,11 +61,11 @@ the derivation attribute
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<programlisting>
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<programlisting>
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shellHook =
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shellHook =
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''
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''
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echo "Hello shell!"
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echo "Hello shell"
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'';
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'';
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</programlisting>
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</programlisting>
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will cause <command>nix-shell</command> to print <literal>Hello shell!</literal>.</para>
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will cause <command>nix-shell</command> to print <literal>Hello shell</literal>.</para>
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</refsection>
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</refsection>
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@ -132,11 +132,11 @@ interactive shell in which to build it:
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<screen>
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<screen>
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$ nix-shell '<nixpkgs>' -A pan
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$ nix-shell '<nixpkgs>' -A pan
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$ unpackPhase
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[nix-shell]$ unpackPhase
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$ cd pan-*
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[nix-shell]$ cd pan-*
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$ configurePhase
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[nix-shell]$ configurePhase
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$ buildPhase
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[nix-shell]$ buildPhase
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$ ./pan/gui/pan
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[nix-shell]$ ./pan/gui/pan
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</screen>
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</screen>
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To clear the environment first, and do some additional automatic
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To clear the environment first, and do some additional automatic
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@ -147,6 +147,14 @@ $ nix-shell '<nixpkgs>' -A pan --pure \
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--command 'export NIX_DEBUG=1; export NIX_CORES=8; return'
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--command 'export NIX_DEBUG=1; export NIX_CORES=8; return'
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</screen>
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</screen>
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Nix expressions can also be given on the command line. For instance,
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the following starts a shell containing the packages
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<literal>sqlite</literal> and <literal>libX11</literal>:
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<screen>
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$ nix-shell -E 'with import <nixpkgs> { }; runCommand "dummy" { buildInputs = [ sqlite xorg.libX11 ]; } ""'
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</screen>
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</para>
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</para>
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</refsection>
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</refsection>
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@ -310,10 +310,10 @@
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<varlistentry xml:id="opt-attr"><term><option>--attr</option> / <option>-A</option>
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<varlistentry xml:id="opt-attr"><term><option>--attr</option> / <option>-A</option>
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<replaceable>attrPath</replaceable></term>
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<replaceable>attrPath</replaceable></term>
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<listitem><para>In <command>nix-env</command>,
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<listitem><para>Select an attribute from the top-level Nix
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<command>nix-instantiate</command> and <command>nix-build</command>,
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expression being evaluated. (<command>nix-env</command>,
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<option>--attr</option> allows you to select an attribute from the
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<command>nix-instantiate</command>, <command>nix-build</command> and
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top-level Nix expression being evaluated. The <emphasis>attribute
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<command>nix-shell</command> only.) The <emphasis>attribute
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path</emphasis> <replaceable>attrPath</replaceable> is a sequence of
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path</emphasis> <replaceable>attrPath</replaceable> is a sequence of
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attribute names separated by dots. For instance, given a top-level
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attribute names separated by dots. For instance, given a top-level
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Nix expression <replaceable>e</replaceable>, the attribute path
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Nix expression <replaceable>e</replaceable>, the attribute path
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</varlistentry>
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</varlistentry>
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<varlistentry><term><option>--expr</option> / <option>-E</option></term>
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<listitem><para>Interpret the command line arguments as a list of
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Nix expressions to be parsed and evaluated, rather than as a list
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of file names of Nix expressions.
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(<command>nix-instantiate</command>, <command>nix-build</command>
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and <command>nix-shell</command> only.)</para></listitem>
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</varlistentry>
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<varlistentry><term><option>--show-trace</option></term>
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<varlistentry><term><option>--show-trace</option></term>
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<listitem><para>Causes Nix to print out a stack trace in case of Nix
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<listitem><para>Causes Nix to print out a stack trace in case of Nix
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@ -11,6 +11,7 @@ my $dryRun = 0;
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my $verbose = 0;
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my $verbose = 0;
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my $runEnv = $0 =~ /nix-shell$/;
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my $runEnv = $0 =~ /nix-shell$/;
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my $pure = 0;
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my $pure = 0;
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my $fromArgs = 0;
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my @instArgs = ();
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my @instArgs = ();
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my @buildArgs = ();
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my @buildArgs = ();
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$drvLink = "./derivation";
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$drvLink = "./derivation";
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}
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}
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elsif ($arg eq "--no-out-link" or $arg eq "--no-link") {
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elsif ($arg eq "--no-out-link" || $arg eq "--no-link") {
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$outLink = "$tmpDir/result";
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$outLink = "$tmpDir/result";
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}
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}
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$drvLink = $ARGV[$n];
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$drvLink = $ARGV[$n];
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}
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}
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elsif ($arg eq "--out-link" or $arg eq "-o") {
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elsif ($arg eq "--out-link" || $arg eq "-o") {
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$n++;
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$n++;
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die "$0: `$arg' requires an argument\n" unless $n < scalar @ARGV;
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die "$0: `$arg' requires an argument\n" unless $n < scalar @ARGV;
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$outLink = $ARGV[$n];
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$outLink = $ARGV[$n];
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}
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}
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elsif ($arg eq "--attr" or $arg eq "-A" or $arg eq "-I") {
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elsif ($arg eq "--attr" || $arg eq "-A" || $arg eq "-I") {
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$n++;
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$n++;
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die "$0: `$arg' requires an argument\n" unless $n < scalar @ARGV;
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die "$0: `$arg' requires an argument\n" unless $n < scalar @ARGV;
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push @instArgs, ($arg, $ARGV[$n]);
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push @instArgs, ($arg, $ARGV[$n]);
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$n += 2;
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$n += 2;
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}
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}
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elsif ($arg eq "--max-jobs" or $arg eq "-j" or $arg eq "--max-silent-time" or $arg eq "--log-type" or $arg eq "--cores" or $arg eq "--timeout") {
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elsif ($arg eq "--max-jobs" || $arg eq "-j" || $arg eq "--max-silent-time" || $arg eq "--log-type" || $arg eq "--c||es" || $arg eq "--timeout") {
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$n++;
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$n++;
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die "$0: `$arg' requires an argument\n" unless $n < scalar @ARGV;
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die "$0: `$arg' requires an argument\n" unless $n < scalar @ARGV;
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push @buildArgs, ($arg, $ARGV[$n]);
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push @buildArgs, ($arg, $ARGV[$n]);
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@exprs = ("-");
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@exprs = ("-");
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}
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}
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elsif ($arg eq "--verbose" or substr($arg, 0, 2) eq "-v") {
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elsif ($arg eq "--verbose" || substr($arg, 0, 2) eq "-v") {
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push @buildArgs, $arg;
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push @buildArgs, $arg;
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push @instArgs, $arg;
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push @instArgs, $arg;
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$verbose = 1;
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$verbose = 1;
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elsif ($arg eq "--pure") { $pure = 1; }
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elsif ($arg eq "--pure") { $pure = 1; }
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elsif ($arg eq "--impure") { $pure = 0; }
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elsif ($arg eq "--impure") { $pure = 0; }
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elsif ($arg eq "--expr" || $arg eq "-E") {
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$fromArgs = 1;
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push @instArgs, "--expr";
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}
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elsif (substr($arg, 0, 1) eq "-") {
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elsif (substr($arg, 0, 1) eq "-") {
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push @buildArgs, $arg;
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push @buildArgs, $arg;
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}
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}
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}
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}
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}
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}
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@exprs = ("shell.nix") if scalar @exprs == 0 && $runEnv && -e "shell.nix";
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if (!$fromArgs) {
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@exprs = ("default.nix") if scalar @exprs == 0;
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@exprs = ("shell.nix") if scalar @exprs == 0 && $runEnv && -e "shell.nix";
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@exprs = ("default.nix") if scalar @exprs == 0;
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}
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$ENV{'IN_NIX_SHELL'} = 1 if $runEnv;
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$ENV{'IN_NIX_SHELL'} = 1 if $runEnv;
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@ -89,6 +89,7 @@ void run(Strings args)
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EvalState state;
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EvalState state;
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Strings files;
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Strings files;
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bool readStdin = false;
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bool readStdin = false;
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bool fromArgs = false;
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bool findFile = false;
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bool findFile = false;
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bool evalOnly = false;
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bool evalOnly = false;
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bool parseOnly = false;
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bool parseOnly = false;
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@ -104,6 +105,8 @@ void run(Strings args)
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||||||
if (arg == "-")
|
if (arg == "-")
|
||||||
readStdin = true;
|
readStdin = true;
|
||||||
|
else if (arg == "--expr" || arg == "-E")
|
||||||
|
fromArgs = true;
|
||||||
else if (arg == "--eval-only")
|
else if (arg == "--eval-only")
|
||||||
evalOnly = true;
|
evalOnly = true;
|
||||||
else if (arg == "--read-write-mode")
|
else if (arg == "--read-write-mode")
|
||||||
|
@ -162,11 +165,13 @@ void run(Strings args)
|
||||||
Expr * e = parseStdin(state);
|
Expr * e = parseStdin(state);
|
||||||
processExpr(state, attrPaths, parseOnly, strict, autoArgs,
|
processExpr(state, attrPaths, parseOnly, strict, autoArgs,
|
||||||
evalOnly, xmlOutput, xmlOutputSourceLocation, e);
|
evalOnly, xmlOutput, xmlOutputSourceLocation, e);
|
||||||
} else if (files.empty())
|
} else if (files.empty() && !fromArgs)
|
||||||
files.push_back("./default.nix");
|
files.push_back("./default.nix");
|
||||||
|
|
||||||
foreach (Strings::iterator, i, files) {
|
foreach (Strings::iterator, i, files) {
|
||||||
Expr * e = state.parseExprFromFile(resolveExprPath(lookupFileArg(state, *i)));
|
Expr * e = fromArgs
|
||||||
|
? state.parseExprFromString(*i, absPath("."))
|
||||||
|
: state.parseExprFromFile(resolveExprPath(lookupFileArg(state, *i)));
|
||||||
processExpr(state, attrPaths, parseOnly, strict, autoArgs,
|
processExpr(state, attrPaths, parseOnly, strict, autoArgs,
|
||||||
evalOnly, xmlOutput, xmlOutputSourceLocation, e);
|
evalOnly, xmlOutput, xmlOutputSourceLocation, e);
|
||||||
}
|
}
|
||||||
|
|
Loading…
Reference in a new issue