* Add an API function exportPaths() that provides the functionality of

  ‘nix-store --export’.
* Add a Perl module that provides the functionality of
  ‘nix-copy-closure --to’.  This is used by build-remote.pl so it no
  longer needs to start a separate nix-copy-closure process.  Also, it
  uses the Perl API to do the export, so it doesn't need to start a
  separate nix-store process either.  As a result, nix-copy-closure
  and build-remote.pl should no longer fail on very large closures due
  to an "Argument list too long" error.  (Note that having very many
  dependencies in a single derivation can still fail because the
  environment can become too large.  Can't be helped though.)

1 files changed, 13 insertions, 0 deletions

diff --git a/perl/lib/Nix/Store.xs b/perl/lib/Nix/Store.xs
index 9e51ea337c7e..b50451f45f10 100644
--- a/perl/lib/Nix/Store.xs
+++ b/perl/lib/Nix/Store.xs
@@ -146,3 +146,16 @@ SV * followLinksToStorePath(char * path)
         }
     OUTPUT:
         RETVAL
+
+
+void exportPaths(int fd, int sign, ...)
+    PPCODE:
+        try {
+            doInit();
+            Paths paths;
+            for (int n = 2; n < items; ++n) paths.push_back(SvPV_nolen(ST(n)));
+            FdSink sink(fd);
+            exportPaths(*store, paths, sign, sink);
+        } catch (Error & e) {
+            croak(e.what());
+        }