From 9e975458b48d9eb041a6484c634be2ee8ee1649d Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <e.dolstra@tudelft.nl>
Date: Sun, 12 Aug 2007 00:29:28 +0000
Subject: * Get rid of the substitutes database table (NIX-47).  Instead, if we
   need any info on substitutable paths, we just call the substituters   (such
 as download-using-manifests.pl) directly.  This means that   it's no longer
 necessary for nix-pull to register substitutes or for   nix-channel to clear
 them, which makes those operations much faster   (NIX-95).  Also, we don't
 have to worry about keeping nix-pull   manifests (in /nix/var/nix/manifests)
 and the database in sync with   each other.

  The downside is that there is some overhead in calling an external
  program to get the substitutes info.  For instance, "nix-env -qas"
  takes a bit longer.

  Abolishing the substitutes table also makes the logic in
  local-store.cc simpler, as we don't need to store info for invalid
  paths.  On the downside, you cannot do things like "nix-store -qR"
  on a substitutable but invalid path (but nobody did that anyway).

* Never catch interrupts (the Interrupted exception).
---
 scripts/download-using-manifests.pl.in | 58 ++++++++++++++++++++++++++++------
 1 file changed, 48 insertions(+), 10 deletions(-)

(limited to 'scripts/download-using-manifests.pl.in')

diff --git a/scripts/download-using-manifests.pl.in b/scripts/download-using-manifests.pl.in
index 65ab36084..f963eead1 100644
--- a/scripts/download-using-manifests.pl.in
+++ b/scripts/download-using-manifests.pl.in
@@ -22,16 +22,6 @@ my $tmpNar2 = "$tmpDir/nar2";
 END { unlink $tmpNar; unlink $tmpNar2; rmdir $tmpDir; }
 
 
-# Check the arguments.
-die unless scalar @ARGV == 1;
-my $targetPath = $ARGV[0];
-
-my $date = strftime ("%F %H:%M:%S UTC", gmtime (time));
-print LOGFILE "$$ get $targetPath $date\n";
-
-print "\n*** Trying to download/patch `$targetPath'\n";
-
-
 # Load all manifests.
 my %narFiles;
 my %localPaths;
@@ -46,6 +36,54 @@ for my $manifest (glob "$manifestDir/*.nixmanifest") {
 }
 
 
+# Parse the arguments.
+
+if ($ARGV[0] eq "--query-paths") {
+    foreach my $storePath (keys %narFiles) { print "$storePath\n"; }
+    foreach my $storePath (keys %localPaths) { print "$storePath\n"; }
+    exit 0;
+}
+
+elsif ($ARGV[0] eq "--query-info") {
+    shift @ARGV;
+    foreach my $storePath (@ARGV) {
+        my $info;
+        if (defined $narFiles{$storePath}) {
+            $info = @{$narFiles{$storePath}}[0];
+        }
+        elsif (defined $localPaths{$storePath}) {
+            $info = @{$localPaths{$storePath}}[0];
+        }
+        else {
+            next; # not an error
+        }
+        print "$storePath\n";
+        print "$info->{deriver}\n";
+        my @references = split " ", $info->{references};
+        my $count = scalar @references;
+        print "$count\n";
+        foreach my $reference (@references) {
+            print "$reference\n";
+        }
+    }
+    exit 0;
+}
+
+elsif ($ARGV[0] ne "--substitute") {
+    die "syntax: $0 [--query-paths | --query-info PATHS... | --substitute PATH]\n";
+}
+
+
+die unless scalar @ARGV == 2;
+my $targetPath = $ARGV[1];
+
+
+my $date = strftime ("%F %H:%M:%S UTC", gmtime (time));
+print LOGFILE "$$ get $targetPath $date\n";
+
+print "\n*** Trying to download/patch `$targetPath'\n";
+
+
 # If we can copy from a local path, do that.
 my $localPathList = $localPaths{$targetPath};
 foreach my $localPath (@{$localPathList}) {
-- 
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