From a1d310b6b5c710215265c1cd0d5893248ed50f92 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <e.dolstra@tudelft.nl>
Date: Mon, 4 Aug 2008 13:44:46 +0000
Subject: * `nix-store --realise': print what paths will be built/downloaded,  
 just like nix-env. * `nix-store --realise': --dry-run option.

---
 src/libmain/shared.cc | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

(limited to 'src/libmain/shared.cc')

diff --git a/src/libmain/shared.cc b/src/libmain/shared.cc
index 5a8f600e8d36..fd16dece7d44 100644
--- a/src/libmain/shared.cc
+++ b/src/libmain/shared.cc
@@ -4,6 +4,7 @@
 #include "globals.hh"
 #include "store-api.hh"
 #include "util.hh"
+#include "misc.hh"
 
 #include <iostream>
 #include <cctype>
@@ -49,6 +50,34 @@ void printGCWarning()
 }
 
 
+void printMissing(const PathSet & paths)
+{
+    unsigned long long downloadSize;
+    PathSet willBuild, willSubstitute, unknown;
+    queryMissing(paths, willBuild, willSubstitute, unknown, downloadSize);
+
+    if (!willBuild.empty()) {
+        printMsg(lvlInfo, format("the following derivations will be built:"));
+        foreach (PathSet::iterator, i, willBuild)
+            printMsg(lvlInfo, format("  %1%") % *i);
+    }
+
+    if (!willSubstitute.empty()) {
+        printMsg(lvlInfo, format("the following paths will be downloaded/copied (%.2f MiB):") %
+            (downloadSize / (1024.0 * 1024.0)));
+        foreach (PathSet::iterator, i, willSubstitute)
+            printMsg(lvlInfo, format("  %1%") % *i);
+    }
+
+    if (!unknown.empty()) {
+        printMsg(lvlInfo, format("don't know how to build the following paths%1%:")
+            % (readOnlyMode ? " (may be caused by read-only store access)" : ""));
+        foreach (PathSet::iterator, i, unknown)
+            printMsg(lvlInfo, format("  %1%") % *i);
+    }
+}
+
+
 static void setLogType(string lt)
 {
     if (lt == "pretty") logType = ltPretty;
-- 
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