added small script fixing the shebang (#!/bin/...) path.

It searches the PATH env variable for the same executable.

svn path=/nixpkgs/trunk/; revision=9667

pkgs/tools/misc/shebangfix/default.nix

@@ -0,0 +1,20 @@
+args:
+args.stdenv.mkDerivation {
+  name = "shebangfix-0.0";
+
+  buildInputs = [args.perl];
+
+  file = ./shebangfix.pl;
+
+  phases = "buildPhase";
+
+  buildPhase = "
+    ensureDir \$out/bin
+    s=\$out/bin/shebangfix
+    cp \$file \$s
+    chmod +x \$s
+    perl \$s \$s
+  ";
+
+  meta = { description = "replaces the #!executable with $#!correctpath/executable "; };
+}

pkgs/tools/misc/shebangfix/shebangfix.pl

@@ -0,0 +1,35 @@
+#!/bin/perl
+use warnings;
+use strict;
+
+#usage PATH=< : separated path list> perl <this script>  file1 file2
+
+print "TODO fix space trouble. This script won't work if your paths contain spaces";
+
+sub findInPath{
+  my $file = shift(@_);
+  foreach (split(/:/, $ENV{'PATH'})){
+    my $f =  "$_/$file";
+    if (-x "$f"){
+      return $f;
+    }
+  }
+  print "unable to find $file in on of ".$ENV{'PATH'};
+  exit 1
+}
+
+foreach (@ARGV)
+{
+  my $file = $_;
+  open(FILE, $file);
+  my $content = do { local $/; <FILE> };
+
+  close(FILE); 
+
+  (my $name = $content) =~ /^#![^ ]*\/([^ \n\r]*)/;
+  my $fullpath =  ($1 eq 'sh') ? "/bin/sh" : findInPath($1);
+  $content =~ s/^#![^ \n\r]*/#!$fullpath/;
+  open(FILE, ">$file");
+  print FILE $content;
+  close($file);
+}

pkgs/top-level/all-packages.nix

@@ -659,6 +659,11 @@ rec {
     inherit fetchurl stdenv ncurses;
   };
 
+  shebangfix = import ../tools/misc/shebangfix {
+    inherit perl;
+    stdenv = overrideSetup stdenv ../stdenv/generic/setup-new-2.sh;
+  };
+
   smartmontools = import ../tools/system/smartmontools {
     inherit fetchurl stdenv;
   };