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authorEelco Dolstra <e.dolstra@tudelft.nl>2007-08-12T00·29+0000
committerEelco Dolstra <e.dolstra@tudelft.nl>2007-08-12T00·29+0000
commit9e975458b48d9eb041a6484c634be2ee8ee1649d (patch)
treeb33e7a1b769d5b82dd565113638ee4e8311eed4e /src/libstore/globals.hh
parent4695f4edd6925147a59befefce1c66d34bb2d0e4 (diff)
* 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).

Diffstat (limited to 'src/libstore/globals.hh')
-rw-r--r--src/libstore/globals.hh5
1 files changed, 5 insertions, 0 deletions
diff --git a/src/libstore/globals.hh b/src/libstore/globals.hh
index 51fa68594798..ea15da0e644b 100644
--- a/src/libstore/globals.hh
+++ b/src/libstore/globals.hh
@@ -67,6 +67,11 @@ extern string thisSystem;
    infinity. */
 extern unsigned int maxSilentTime;
 
+/* The substituters.  There are programs that can somehow realise a
+   store path without building, e.g., by downloading it or copying it
+   from a CD. */
+extern Paths substituters;
+
 
 Strings querySetting(const string & name, const Strings & def);