* One-click installation :-)

The script nix-install-package takes a `Nix package file' (which
  contains one or more derivations, along with URLs of Nix caches),
  unpacks it, pulls the caches, and installs the derivations in the
  user's environment.

  For best results, associate the command `xterm -e
  /nix/bin/nix-install-package' with the MIME type
  `application/x-nix-package' and visit
  http://losser.st-lab.cs.uu.nl/~eelco/test/.

scripts/Makefile.am

@@ -1,5 +1,6 @@
 bin_SCRIPTS = nix-collect-garbage \
- nix-pull nix-push nix-prefetch-url
+ nix-pull nix-push nix-prefetch-url \
+ nix-install-package
 
 noinst_SCRIPTS = nix-profile.sh
 
@@ -12,8 +13,8 @@ install-exec-local:
 
 include ../substitute.mk
 
-EXTRA_DIST = nix-switch.in nix-collect-garbage.in \
+EXTRA_DIST = nix-collect-garbage.in \
  nix-pull.in nix-push.in nix-profile.sh.in \
- nix-prefetch-url.in \
+ nix-prefetch-url.in nix-install-package.in \
  prebuilts.conf
 

scripts/nix-install-package.in

@@ -0,0 +1,37 @@
+#! /usr/bin/perl -w
+
+use strict;
+use POSIX qw(tmpnam);
+
+my $pkgfile = $ARGV[0];
+die unless defined $pkgfile;
+
+my $tmpdir;
+do { $tmpdir = tmpnam(); }
+until mkdir $tmpdir, 0777;
+
+# !!! remove tmpdir on exit
+
+print "unpacking $pkgfile in $tmpdir...\n";
+system "bunzip2 < $pkgfile | (cd $tmpdir && tar xf -)";
+die if $?;
+
+print "this package contains the following derivations:\n";
+system "nix-env -qsf $tmpdir/default.nix";
+die if $?;
+
+print "do you wish to install them (y/n)? ";
+my $reply = <STDIN>;
+chomp $reply;
+exit if (!($reply eq "y"));
+
+print "pulling caches...\n";
+system "nix-pull `cat $tmpdir/caches`";
+die if $?;
+
+print "installing package...\n";
+system "nix-env -i $tmpdir/default.nix '*'";
+die if $?;
+
+print "installing succeeded! (enter to continue)\n";
+<STDIN>;

scripts/nix-pull.in

@@ -19,15 +19,10 @@ my @sucs;
 
 my $fullexpr = "[";
 
-open CONFFILE, "<$conffile";
 
-while (<CONFFILE>) {
-
-    chomp;
-    if (/^\s*(\S+)\s*(\#.*)?$/) {
-        my $url = $1;
+sub processURL {
+    my $url = shift;
     $url =~ s/\/$//;
-
     print "obtaining list of Nix archives at $url...\n";
 
     system "wget --cache=off '$url'/MANIFEST -O '$manifest' 2> /dev/null"; # !!! escape
@@ -60,7 +55,7 @@ while (<CONFFILE>) {
             if (/^\}$/) {
                 $inside = 0;
                 my $fullurl = "$url/$narname";
-                    print "$storepath\n";
+#                print "$storepath\n";
 
                 # Construct a Nix expression that fetches and unpacks a
                 # Nix archive from the network.
@@ -99,6 +94,23 @@ while (<CONFFILE>) {
     close MANIFEST;
 }
 
+
+# Obtain URLs either from the command line or from a configuration file.
+if (scalar @ARGV > 0) {
+    while (@ARGV) {
+        my $url = shift @ARGV;
+            processURL $url;
+    }
+} else {
+    open CONFFILE, "<$conffile";
+    while (<CONFFILE>) {
+        chomp;
+        if (/^\s*(\S+)\s*(\#.*)?$/) {
+            my $url = $1;
+            processURL $url;
+        }
+    }
+    close CONFFILE;
 }
 
 $fullexpr .= "]";