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Merge pull request #884 from srp/fix-nix-build-examples

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fix "nix-build" examples
This commit is contained in:
Eelco Dolstra 2016-05-03 11:13:54 +02:00
parent a647c163ca 96d3534a9e
commit a375326a97
1 changed files with 8 additions and 10 deletions
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18
doc/manual/expressions/simple-building-testing.xml
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@ -7,15 +7,14 @@
<title>Building and Testing</title> <title>Building and Testing</title>
<para>You can now try to build Hello. Of course, you could do <para>You can now try to build Hello. Of course, you could do
<literal>nix-env -f pkgs/top-level/all-packages.nix -i hello</literal>, <literal>nix-env -i hello</literal>, but you may not want to install a
but you may not want to install a possibly broken package just yet. possibly broken package just yet. The best way to test the package is by
The best way to test the package is by using the command <command using the command <command linkend="sec-nix-build">nix-build</command>,
linkend="sec-nix-build">nix-build</command>, which builds a Nix which builds a Nix expression and creates a symlink named
expression and creates a symlink named <filename>result</filename> in <filename>result</filename> in the current directory:
the current directory:
<screen> <screen>
$ nix-build pkgs/top-level/all-packages.nix -A hello $ nix-build -A hello
building path `/nix/store/632d2b22514d...-hello-2.1.1' building path `/nix/store/632d2b22514d...-hello-2.1.1'
hello-2.1.1/ hello-2.1.1/
hello-2.1.1/intl/ hello-2.1.1/intl/
@ -29,8 +28,7 @@ $ ./result/bin/hello
Hello, world!</screen> Hello, world!</screen>
The <link linkend='opt-attr'><option>-A</option></link> option selects The <link linkend='opt-attr'><option>-A</option></link> option selects
the <literal>hello</literal> attribute from the <literal>hello</literal> attribute. This is faster than using the
<filename>all-packages.nix</filename>. This is faster than using the
symbolic package name specified by the <literal>name</literal> symbolic package name specified by the <literal>name</literal>
attribute (which also happens to be <literal>hello</literal>) and is attribute (which also happens to be <literal>hello</literal>) and is
unambiguous (there can be multiple packages with the symbolic name unambiguous (there can be multiple packages with the symbolic name
@ -69,7 +67,7 @@ block (or perform other derivations if available) until the build
finishes: finishes:
<screen> <screen>
$ nix-build pkgs/top-level/all-packages.nix -A hello $ nix-build -A hello
waiting for lock on `/nix/store/0h5b7hp8d4hqfrw8igvx97x1xawrjnac-hello-2.1.1x'</screen> waiting for lock on `/nix/store/0h5b7hp8d4hqfrw8igvx97x1xawrjnac-hello-2.1.1x'</screen>
So it is always safe to run multiple instances of Nix in parallel So it is always safe to run multiple instances of Nix in parallel