nix-store -r: Add ‘--ignore-unknown’ flag

This flag causes paths that do not have a known substitute to be
quietly ignored.  This is mostly useful for Charon, allowing it to
speed up deployment by letting a machine use substitutes for all
substitutable paths, instead of uploading them.  The latter is
frequently faster, e.g. if the target machine has a fast Internet
connection while the source machine is on a slow ADSL line.

1 files changed, 7 insertions, 0 deletions

diff --git a/src/libmain/shared.cc b/src/libmain/shared.cc
index 9e5964acf8..2cf5b08df3 100644
--- a/src/libmain/shared.cc
+++ b/src/libmain/shared.cc
@@ -47,7 +47,14 @@ void printMissing(StoreAPI & store, const PathSet & paths)
     unsigned long long downloadSize, narSize;
     PathSet willBuild, willSubstitute, unknown;
     queryMissing(store, paths, willBuild, willSubstitute, unknown, downloadSize, narSize);
+    printMissing(willBuild, willSubstitute, unknown, downloadSize, narSize);
+}
+
 
+void printMissing(const PathSet & willBuild,
+    const PathSet & willSubstitute, const PathSet & unknown,
+    unsigned long long downloadSize, unsigned long long narSize)
+{
     if (!willBuild.empty()) {
         printMsg(lvlInfo, format("these derivations will be built:"));
         foreach (PathSet::iterator, i, willBuild)