Merged trunk R.10943 back in

mergeTrunkBackIn.sh

@@ -1,4 +1,4 @@
-svn merge -r 10154:10531 https://svn.cs.uu.nl:12443/repos/trace/nix/trunk
+svn merge -r 10855:10943 https://svn.cs.uu.nl:12443/repos/trace/nix/trunk
 
 #already done:
 # 8628 
@@ -31,3 +31,6 @@ svn merge -r 10154:10531 https://svn.cs.uu.nl:12443/repos/trace/nix/trunk
 # 10133
 # 10154
 # 10531
+# 10692
+# 10855
+# 10943

scripts/Makefile.am

@@ -5,7 +5,7 @@ bin_SCRIPTS = nix-collect-garbage \
   nix-copy-closure 
 
 noinst_SCRIPTS = nix-profile.sh generate-patches.pl \
-  find-runtime-roots.pl build-remote.pl
+  find-runtime-roots.pl build-remote.pl nix-reduce-build
 
 nix-pull nix-push: readmanifest.pm readconfig.pm download-using-manifests.pl
 
@@ -35,4 +35,5 @@ EXTRA_DIST = nix-collect-garbage.in \
   nix-pack-closure.in nix-unpack-closure.in \
   nix-copy-closure.in \
   find-runtime-roots.pl.in \
-  build-remote.pl.in
+  build-remote.pl.in \
+  nix-reduce-build.in

scripts/nix-reduce-build.in

@@ -0,0 +1,68 @@
+#! @shell@
+
+WORKING_DIRECTORY=$(mktemp -d "${TMPDIR:-/tmp}"/nix-reduce-build-XXXXXX);
+cd "$WORKING_DIRECTORY";
+
+if test -z "$1" ; then
+	echo 'nix-reduce-build (paths or Nix expressions) -- (logins at remote computers)' >&2
+	echo As in: >&2
+	echo nix-reduce-build /etc/nixos/nixos -- user@somewhere.nowhere.example.org >&2
+	exit;
+fi;
+
+while ! test "$1" = "--" || test "$1" = "" ; do 
+	echo "$1" >> initial; >&2
+	shift;
+done
+shift;
+echo Will work on $(cat initial | wc -l) targets. >&2
+
+while read ; do
+	case "$REPLY" in 
+		${NIX_STORE_PATH:-/nix/store}/*)
+			echo "$REPLY" >> paths; >&2
+			;;
+		*)
+			nix-instantiate "$REPLY" >> paths;
+			;;
+	esac;
+done < initial;
+echo Proceeding $(cat paths | wc -l) paths. >&2
+
+while read; do
+	case "$REPLY" in
+		*.drv)
+			echo "$REPLY" >> derivers; >&2
+			;;
+		*)
+			nix-store --query --deriver "$REPLY" >>derivers;
+			;;
+	esac;
+done < paths;
+echo Found $(cat derivers | wc -l) derivers. >&2
+
+cat derivers | xargs nix-store --query -R > derivers-closure;
+echo Proceeding at most $(cat derivers-closure | wc -l) derivers. >&2
+
+cat derivers-closure | egrep '[.]drv$' | xargs nix-store --query --outputs > wanted-paths;
+cat derivers-closure | egrep -v '[.]drv$' >> wanted-paths;
+echo Prepared $(cat wanted-paths | wc -l) paths to get. >&2
+
+cat wanted-paths | xargs nix-store --check-validity --print-invalid > needed-paths;
+echo We need $(cat needed-paths | wc -l) paths. >&2
+
+if test -z "$1" ; then
+	cat needed-paths;	
+fi;
+
+for i in "$@"; do 
+	cat needed-paths | while read; do 
+		nix-copy-closure --from "$i" --gzip "$REPLY" </dev/null || true; 
+	done;
+	mv needed-paths wanted-paths;
+	cat wanted-paths | xargs nix-store --check-validity --print-invalid > needed-paths;
+	echo We still need $(cat needed-paths | wc -l) paths. >&2
+done;
+
+cd /
+rm -r "$WORKING_DIRECTORY"

src/libexpr/nixexpr.cc

@@ -215,7 +215,11 @@ static void checkVarDefs2(set<Expr> & done, const ATermMap & defs, Expr e)
     ATerm with, body;
     ATermList rbnds, nrbnds;
 
-    if (matchVar(e, name)) {
+    /* Closed terms don't have free variables, so we don't have to
+       check by definition. */
+    if (matchClosed(e, value)) return;
+    
+    else if (matchVar(e, name)) {
         if (!defs.get(name))
             throw EvalError(format("undefined variable `%1%'")
                 % aterm2String(name));

src/libstore/local-store.cc

@@ -1136,11 +1136,8 @@ void LocalStore::exportPath(const Path & path, bool sign,
 {
     assertStorePath(path);
 
-    /* Wrap all of this in a transaction to make sure that we export
-       consistent metadata. */
-    Transaction txn(nixDB);
     addTempRoot(path);
-    if (!isValidPathTxn(txn, path))
+    if (!isValidPath(path))
         throw Error(format("path `%1%' is not valid") % path);
 
     HashAndWriteSink hashAndWriteSink(sink);
@@ -1152,10 +1149,10 @@ void LocalStore::exportPath(const Path & path, bool sign,
     writeString(path, hashAndWriteSink);
     
     PathSet references;
-    nix::queryXReferencesTxn(txn, path, references, true, 0);		//TODO we can only now export the final revision	//TODO also export the state references ???
+    queryXReferencesTxn(noTxn, path, references, true, 0);		//TODO we can export the inital or latest revision	//TODO also export the state references ???
     writeStringSet(references, hashAndWriteSink);
 
-    Path deriver = nix::queryDeriver(txn, path);
+    Path deriver = queryDeriver(path);
     writeString(deriver, hashAndWriteSink);
 
     if (sign) {
@@ -1185,8 +1182,6 @@ void LocalStore::exportPath(const Path & path, bool sign,
         
     } else
         writeInt(0, hashAndWriteSink);
-
-    txn.commit();
 }