From 7592f48c83b2f333fa7c5e85fd2fb64445b1c6ca Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <e.dolstra@tudelft.nl>
Date: Mon, 4 Aug 2008 13:46:01 +0000
Subject: [PATCH] * nix-build: `--dry-run' flag.

---
 scripts/nix-build.in | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/scripts/nix-build.in b/scripts/nix-build.in
index 1d2584bfb..a674a0041 100644
--- a/scripts/nix-build.in
+++ b/scripts/nix-build.in
@@ -9,6 +9,8 @@ my $addOutLink = 1;
 my $outLink;
 my $drvLink;
 
+my $dryRun = 0;
+
 my @instArgs = ();
 my @buildArgs = ();
 my @exprs = ();
@@ -89,6 +91,11 @@ EOF
         push @buildArgs, ($arg, $ARGV[$n]);
     }
 
+    elsif ($arg eq "--dry-run") {
+        push @buildArgs, "--dry-run";
+        $dryRun = 1;
+    }
+    
     elsif (substr($arg, 0, 1) eq "-") {
         push @buildArgs, $arg;
     }
@@ -133,6 +140,8 @@ foreach my $expr (@exprs) {
     while (<OUTPATHS>) {chomp; push @outPaths, $_;}
     close OUTPATHS or exit 1;
 
+    next if $dryRun;
+
     foreach my $outPath (@outPaths) {
         my $target = readlink $outPath or die "cannot read symlink `$outPath'";
         print "$target\n";