forked from lix-project/lix
nix-build --run-env: Add a ‘--pure’ flag
This causes the environment to be (almost) cleared, thus giving a shell that more closely resembled the actual Nix derivation.
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@ -42,6 +42,7 @@
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<option>--run-env</option>
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<arg><option>--command</option> <replaceable>cmd</replaceable></arg>
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<arg><option>--exclude</option> <replaceable>regexp</replaceable></arg>
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<arg><option>--pure</option></arg>
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</arg>
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<arg choice='plain' rep='repeat'><replaceable>paths</replaceable></arg>
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</cmdsynopsis>
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@ -147,7 +148,10 @@ also <xref linkend="sec-common-options" />.</phrase></para>
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<listitem><para>In the environment of the derivation, run the
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shell command <replaceable>cmd</replaceable> instead of starting
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an interactive shell.</para></listitem>
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an interactive shell. However, if you end the shell command with
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<literal>return</literal>, you still get an interactive shell.
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This can be useful for doing any additional
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initialisation.</para></listitem>
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</varlistentry>
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@ -159,6 +163,21 @@ also <xref linkend="sec-common-options" />.</phrase></para>
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</varlistentry>
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<varlistentry><term><option>--pure</option></term>
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<listitem><para>If this flag is specified, the environment is
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almost entirely cleared before the interactive shell is started,
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so you get an environment that more closely corresponds to the
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“real” Nix build. A few variables, in particular
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<envar>HOME</envar>, <envar>USER</envar> and
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<envar>DISPLAY</envar>, are retained. Note that
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<filename>~/.bashrc</filename> and (depending on your Bash
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installation) <filename>/etc/bashrc</filename> are still sourced,
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so any variables set there will affect the interactive
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shell.</para></listitem>
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</varlistentry>
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</variablelist>
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</refsection>
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@ -189,6 +208,14 @@ $ buildPhase
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$ ./pan/gui/pan
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</screen>
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To clear the environment first, and do some additional automatic
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initialisation of the interactive shell:
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<screen>
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$ nix-build '<nixpkgs>' --run-env -A pan --pure \
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--command 'export NIX_DEBUG=1; export NIX_CORES=8; return'
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</screen>
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</para>
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<para>If a derivation has multiple outputs,
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@ -10,6 +10,7 @@ use File::Temp qw(tempdir);
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my $dryRun = 0;
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my $verbose = 0;
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my $runEnv = 0;
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my $pure = 0;
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my @instArgs = ();
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my @buildArgs = ();
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@ -134,6 +135,10 @@ for (my $n = 0; $n < scalar @ARGV; $n++) {
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push @envExclude, $ARGV[$n];
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}
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elsif ($arg eq "--pure") {
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$pure = 1;
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}
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elsif (substr($arg, 0, 1) eq "-") {
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push @buildArgs, $arg;
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}
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@ -169,6 +174,14 @@ foreach my $expr (@exprs) {
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or die "$0: failed to build all dependencies\n";
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# Set the environment.
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if ($pure) {
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foreach my $name (keys %ENV) {
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next if $name eq "HOME" || $name eq "USER" || $name eq "LOGNAME" || $name eq "DISPLAY" || $name eq "PATH";
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delete $ENV{$name};
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}
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# NixOS hack: prevent /etc/bashrc from sourcing /etc/profile.
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$ENV{'__ETC_PROFILE_SOURCED'} = 1;
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}
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$ENV{'NIX_BUILD_TOP'} = $ENV{'TMPDIR'} || "/tmp";
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$ENV{$_} = $drv->{env}->{$_} foreach keys %{$drv->{env}};
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@ -180,9 +193,9 @@ foreach my $expr (@exprs) {
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writeFile(
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$rcfile,
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'[ -e ~/.bashrc ] && source ~/.bashrc; ' .
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'p=$PATH; ' .
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($pure ? '' : 'p=$PATH; ' ).
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'[ -e $stdenv/setup ] && source $stdenv/setup; ' .
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'PATH=$PATH:$p; ' .
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($pure ? '' : 'PATH=$PATH:$p; ') .
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'set +e; ' .
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'PS1="\n\[\033[1;32m\][nix-build:\w]$\[\033[0m\] "; ' .
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$envCommand);
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