3 files changed, 29 insertions, 5 deletions
diff --git a/src/nix-store/Makefile.am b/src/nix-store/Makefile.am
index 9a439dd9219c..e0ba809dcb2a 100644
--- a/src/nix-store/Makefile.am
+++ b/src/nix-store/Makefile.am
@@ -2,7 +2,7 @@ bin_PROGRAMS = nix-store
 
 nix_store_SOURCES = nix-store.cc dotgraph.cc dotgraph.hh help.txt
 nix_store_LDADD = ../libmain/libmain.la ../libstore/libstore.la ../libutil/libutil.la \
- ../boost/format/libformat.la @ADDITIONAL_NETWORK_LIBS@
+ ../boost/format/libformat.la
 
 nix-store.o: help.txt.hh
 
diff --git a/src/nix-store/help.txt b/src/nix-store/help.txt
index 7576e3ef5d42..8022bf7c7120 100644
--- a/src/nix-store/help.txt
+++ b/src/nix-store/help.txt
@@ -27,6 +27,9 @@ Operations:
   --verify: verify Nix structures
   --optimise: optimise the Nix store by hard-linking identical files
 
+  --query-failed-paths: list paths that failed to build (if enabled)
+  --clear-failed-paths: clear the failed status of the given paths
+
   --version: output version information
   --help: display help
 
diff --git a/src/nix-store/nix-store.cc b/src/nix-store/nix-store.cc
index 22effc65dc77..3b34b9dae6f4 100644
--- a/src/nix-store/nix-store.cc
+++ b/src/nix-store/nix-store.cc
@@ -21,7 +21,7 @@ typedef void (* Operation) (Strings opFlags, Strings opArgs);
 
 void printHelp()
 {
-    cout << string((char *) helpText, sizeof helpText);
+    cout << string((char *) helpText);
 }
 
 
@@ -33,7 +33,7 @@ static bool indirectRoot = false;
 LocalStore & ensureLocalStore()
 {
     LocalStore * store2(dynamic_cast<LocalStore *>(store.get()));
-    if (!store2) throw Error("you don't have sufficient rights to use --verify");
+    if (!store2) throw Error("you don't have sufficient rights to use this command");
     return *store2;
 }
 
@@ -651,8 +651,7 @@ static void opOptimise(Strings opFlags, Strings opArgs)
 
     bool dryRun = false;
 
-    for (Strings::iterator i = opFlags.begin();
-         i != opFlags.end(); ++i)
+    foreach (Strings::iterator, i, opFlags)
         if (*i == "--dry-run") dryRun = true;
         else throw UsageError(format("unknown flag `%1%'") % *i);
 
@@ -667,6 +666,24 @@ static void opOptimise(Strings opFlags, Strings opArgs)
 }
 
 
+static void opQueryFailedPaths(Strings opFlags, Strings opArgs)
+{
+    if (!opArgs.empty() || !opFlags.empty())
+        throw UsageError("no arguments expected");
+    PathSet failed = store->queryFailedPaths();
+    foreach (PathSet::iterator, i, failed)
+        cout << format("%1%\n") % *i;
+}
+
+
+static void opClearFailedPaths(Strings opFlags, Strings opArgs)
+{
+    if (!opFlags.empty())
+        throw UsageError("no flags expected");
+    store->clearFailedPaths(PathSet(opArgs.begin(), opArgs.end()));
+}
+
+
 /* Scan the arguments; find the operation, set global flags, put all
    other flags in a list, and put all other arguments in another
    list. */
@@ -718,6 +735,10 @@ void run(Strings args)
             op = opVerify;
         else if (arg == "--optimise")
             op = opOptimise;
+        else if (arg == "--query-failed-paths")
+            op = opQueryFailedPaths;
+        else if (arg == "--clear-failed-paths")
+            op = opClearFailedPaths;
         else if (arg == "--add-root") {
             if (i == args.end())
                 throw UsageError("`--add-root requires an argument");