de91a42c6e
It moves runHook to a later position in the rcfile. After that we are
able to set the PS1 environment-variable for a nix-shell environment
e.g.:
# turn the color of the prompt to blue
shellHook = ''
export PS1="\n\[\033[1;34m\][\u@\h:\w]$\[\033[0m\] ";
'';
338 lines
10 KiB
Plaintext
Executable file
338 lines
10 KiB
Plaintext
Executable file
#! @perl@ -w @perlFlags@
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use utf8;
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use strict;
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use Nix::Config;
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use Nix::Store;
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use Nix::Utils;
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use File::Basename;
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use Cwd;
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binmode STDERR, ":encoding(utf8)";
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my $dryRun = 0;
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my $verbose = 0;
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my $runEnv = $0 =~ /nix-shell$/;
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my $pure = 0;
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my $fromArgs = 0;
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my $packages = 0;
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my $interactive = 1;
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my @instArgs = ();
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my @buildArgs = ();
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my @exprs = ();
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my $shell = $ENV{SHELL} || "/bin/sh";
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my $envCommand = ""; # interactive shell
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my @envExclude = ();
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my $myName = $runEnv ? "nix-shell" : "nix-build";
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my $inShebang = 0;
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my $script;
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my $tmpDir = mkTempDir($myName);
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my $outLink = "./result";
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my $drvLink = "$tmpDir/derivation";
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# Ensure that the $tmpDir is deleted.
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$SIG{'INT'} = sub { exit 1 };
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# Heuristic to see if we're invoked as a shebang script, namely, if we
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# have a single argument, it's the name of an executable file, and it
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# starts with "#!".
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if ($runEnv && scalar @ARGV == 1) {
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$script = $ARGV[0];
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if (-f $script && -x $script) {
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open SCRIPT, "<$script" or die "$0: cannot open ‘$script’: $!\n";
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my $first = <SCRIPT>;
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if ($first =~ /^\#\!/) {
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$inShebang = 1;
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@ARGV = ();
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while (<SCRIPT>) {
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chomp;
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if (/^\#\!\s*nix-shell (.*)$/) {
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@ARGV = split / /, $1;
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}
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}
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}
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close SCRIPT;
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}
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}
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for (my $n = 0; $n < scalar @ARGV; $n++) {
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my $arg = $ARGV[$n];
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if ($arg eq "--help") {
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exec "man $myName" or die;
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}
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elsif ($arg eq "--version") {
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print "$myName (Nix) $Nix::Config::version\n";
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exit 0;
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}
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elsif ($arg eq "--add-drv-link") {
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$drvLink = "./derivation";
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}
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elsif ($arg eq "--no-out-link" || $arg eq "--no-link") {
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$outLink = "$tmpDir/result";
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}
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elsif ($arg eq "--drv-link") {
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$n++;
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die "$0: ‘$arg’ requires an argument\n" unless $n < scalar @ARGV;
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$drvLink = $ARGV[$n];
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}
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elsif ($arg eq "--out-link" || $arg eq "-o") {
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$n++;
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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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}
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elsif ($arg eq "--attr" || $arg eq "-A" || $arg eq "-I") {
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$n++;
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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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}
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elsif ($arg eq "--arg" || $arg eq "--argstr") {
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die "$0: ‘$arg’ requires two arguments\n" unless $n + 2 < scalar @ARGV;
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push @instArgs, ($arg, $ARGV[$n + 1], $ARGV[$n + 2]);
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$n += 2;
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}
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elsif ($arg eq "--log-type") {
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$n++;
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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 @buildArgs, ($arg, $ARGV[$n]);
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}
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elsif ($arg eq "--option") {
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die "$0: ‘$arg’ requires two arguments\n" unless $n + 2 < scalar @ARGV;
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push @instArgs, ($arg, $ARGV[$n + 1], $ARGV[$n + 2]);
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push @buildArgs, ($arg, $ARGV[$n + 1], $ARGV[$n + 2]);
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$n += 2;
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}
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elsif ($arg eq "--max-jobs" || $arg eq "-j" || $arg eq "--max-silent-time" || $arg eq "--log-type" || $arg eq "--cores" || $arg eq "--timeout" || $arg eq '--add-root') {
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$n++;
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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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}
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elsif ($arg eq "--dry-run") {
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push @buildArgs, "--dry-run";
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$dryRun = 1;
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}
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elsif ($arg eq "--show-trace") {
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push @instArgs, $arg;
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}
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elsif ($arg eq "-") {
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@exprs = ("-");
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}
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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 @instArgs, $arg;
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$verbose = 1;
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}
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elsif ($arg eq "--quiet" || $arg eq "--repair") {
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push @buildArgs, $arg;
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push @instArgs, $arg;
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}
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elsif ($arg eq "--check") {
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push @buildArgs, $arg;
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}
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elsif ($arg eq "--run-env") { # obsolete
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$runEnv = 1;
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}
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elsif ($arg eq "--command" || $arg eq "--run") {
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$n++;
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die "$0: ‘$arg’ requires an argument\n" unless $n < scalar @ARGV;
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$envCommand = "$ARGV[$n]\nexit";
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$interactive = 0 if $arg eq "--run";
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}
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elsif ($arg eq "--exclude") {
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$n++;
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die "$0: ‘$arg’ requires an argument\n" unless $n < scalar @ARGV;
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push @envExclude, $ARGV[$n];
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}
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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 "--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 ($arg eq "--packages" || $arg eq "-p") {
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$packages = 1;
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}
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elsif ($inShebang && $arg eq "-i") {
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$n++;
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die "$0: ‘$arg’ requires an argument\n" unless $n < scalar @ARGV;
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my $interpreter = $ARGV[$n];
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# Überhack to support Perl. Perl examines the shebang and
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# executes it unless it contains the string "perl" or "indir",
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# or (undocumented) argv[0] does not contain "perl". Exploit
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# the latter by doing "exec -a".
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my $execArgs = $interpreter =~ /perl/ ? "-a PERL" : "";
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$envCommand = "exec $execArgs $interpreter $script";
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}
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elsif (substr($arg, 0, 1) eq "-") {
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push @buildArgs, $arg;
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}
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else {
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push @exprs, $arg;
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}
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}
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if ($packages) {
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push @instArgs, "--expr";
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@exprs = (
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'with import <nixpkgs> { }; runCommand "shell" { buildInputs = [ '
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. (join " ", map { "($_)" } @exprs) . ']; } ""');
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} elsif (!$fromArgs) {
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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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foreach my $expr (@exprs) {
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# Instantiate.
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my @drvPaths;
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if ($expr !~ /^\/.*\.drv$/) {
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# If we're in a #! script, interpret filenames relative to the
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# script.
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$expr = dirname(Cwd::abs_path($script)) . "/" . $expr
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if $inShebang && $expr !~ /^\//;
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# !!! would prefer the perl 5.8.0 pipe open feature here.
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my $pid = open(DRVPATHS, "-|") || exec "$Nix::Config::binDir/nix-instantiate", "--add-root", $drvLink, "--indirect", @instArgs, $expr;
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while (<DRVPATHS>) {chomp; push @drvPaths, $_;}
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if (!close DRVPATHS) {
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die "nix-instantiate killed by signal " . ($? & 127) . "\n" if ($? & 127);
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exit 1;
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}
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} else {
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push @drvPaths, $expr;
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}
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if ($runEnv) {
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die "$0: a single derivation is required\n" if scalar @drvPaths != 1;
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my $drvPath = $drvPaths[0];
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$drvPath = (split '!',$drvPath)[0];
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$drvPath = readlink $drvPath or die "cannot read symlink ‘$drvPath’" if -l $drvPath;
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my $drv = derivationFromPath($drvPath);
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# Build or fetch all dependencies of the derivation.
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my @inputDrvs = grep { my $x = $_; (grep { $x =~ $_ } @envExclude) == 0 } @{$drv->{inputDrvs}};
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system("$Nix::Config::binDir/nix-store", "-r", "--no-output", "--no-gc-warning", @buildArgs, @inputDrvs, @{$drv->{inputSrcs}}) == 0
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or die "$0: failed to build all dependencies\n";
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# Set the environment.
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my $tmp = $ENV{"TMPDIR"} // $ENV{"XDG_RUNTIME_DIR"} // "/tmp";
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if ($pure) {
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foreach my $name (keys %ENV) {
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next if grep { $_ eq $name } ("HOME", "USER", "LOGNAME", "DISPLAY", "PATH", "TERM", "IN_NIX_SHELL", "TZ", "PAGER");
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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'} = $ENV{'TEMPDIR'} = $ENV{'TMP'} = $ENV{'TEMP'} = $tmp;
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$ENV{'NIX_STORE'} = $Nix::Config::storeDir;
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$ENV{$_} = $drv->{env}->{$_} foreach keys %{$drv->{env}};
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# Run a shell using the derivation's environment. For
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# convenience, source $stdenv/setup to setup additional
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# environment variables and shell functions. Also don't lose
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# the current $PATH directories.
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my $rcfile = "$tmpDir/rc";
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writeFile(
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$rcfile,
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"rm -rf '$tmpDir'; " .
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'unset BASH_ENV; ' .
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'[ -n "$PS1" ] && [ -e ~/.bashrc ] && source ~/.bashrc; ' .
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($pure ? '' : 'p=$PATH; ' ) .
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'dontAddDisableDepTrack=1; ' .
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'[ -e $stdenv/setup ] && source $stdenv/setup; ' .
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($pure ? '' : 'PATH=$PATH:$p; unset p; ') .
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'set +e; ' .
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'[ -n "$PS1" ] && PS1="\n\[\033[1;32m\][nix-shell:\w]$\[\033[0m\] "; ' .
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'if [ "$(type -t runHook)" = function ]; then runHook shellHook; fi; ' .
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'unset NIX_ENFORCE_PURITY; ' .
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'unset NIX_INDENT_MAKE; ' .
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'shopt -u nullglob; ' .
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'unset TZ; ' . (defined $ENV{'TZ'} ? "export TZ='${ENV{'TZ'}}'; " : '') .
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$envCommand);
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$ENV{BASH_ENV} = $rcfile;
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my @args = ($ENV{NIX_BUILD_SHELL} // "bash");
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push @args, "--rcfile" if $interactive;
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push @args, $rcfile;
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exec @args;
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die;
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}
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# Ugly hackery to make "nix-build -A foo.all" produce symlinks
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# ./result, ./result-dev, and so on, rather than ./result,
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# ./result-2-dev, and so on. This combines multiple derivation
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# paths into one "/nix/store/drv-path!out1,out2,..." argument.
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my $prevDrvPath = "";
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my @drvPaths2;
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foreach my $drvPath (@drvPaths) {
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my $p = $drvPath; my $output = "out";
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if ($drvPath =~ /(.*)!(.*)/) {
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$p = $1; $output = $2;
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} else {
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$p = $drvPath;
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}
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my $target = readlink $p or die "cannot read symlink ‘$p’";
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print STDERR "derivation is $target\n" if $verbose;
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if ($target eq $prevDrvPath) {
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push @drvPaths2, (pop @drvPaths2) . "," . $output;
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} else {
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push @drvPaths2, $target . "!" . $output;
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$prevDrvPath = $target;
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}
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}
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# Build.
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my @outPaths;
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my $pid = open(OUTPATHS, "-|") || exec "$Nix::Config::binDir/nix-store", "--add-root", $outLink, "--indirect", "-r",
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@buildArgs, @drvPaths2;
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while (<OUTPATHS>) {chomp; push @outPaths, $_;}
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if (!close OUTPATHS) {
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die "nix-store killed by signal " . ($? & 127) . "\n" if ($? & 127);
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exit ($? >> 8 || 1);
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}
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next if $dryRun;
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foreach my $outPath (@outPaths) {
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my $target = readlink $outPath or die "cannot read symlink ‘$outPath’";
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print "$target\n";
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}
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}
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