5 files changed, 68 insertions, 7 deletions
diff --git a/pkgs/build-support/cabal/default.nix b/pkgs/build-support/cabal/default.nix
index 45bd5567fc4c..047bccebf095 100644
--- a/pkgs/build-support/cabal/default.nix
+++ b/pkgs/build-support/cabal/default.nix
@@ -133,9 +133,7 @@ assert !enableStaticLibraries -> versionOlder "7.7" ghc.version;
             jailbreak = false;
 
             # pass the '--enable-split-objs' flag to cabal in the configure stage
-            enableSplitObjs = !(  stdenv.isDarwin                       # http://hackage.haskell.org/trac/ghc/ticket/4013
-                               || versionOlder "7.6.99" ghc.version     # -fsplit-ojbs is broken in 7.7 snapshot
-                               );
+            enableSplitObjs = !stdenv.isDarwin;         # http://hackage.haskell.org/trac/ghc/ticket/4013
 
             # pass the '--enable-tests' flag to cabal in the configure stage
             # and run any regression test suites the package might have
diff --git a/pkgs/build-support/fetchurl/builder.sh b/pkgs/build-support/fetchurl/builder.sh
index 402fe0cba5b8..0c6e16551b4a 100644
--- a/pkgs/build-support/fetchurl/builder.sh
+++ b/pkgs/build-support/fetchurl/builder.sh
@@ -17,12 +17,16 @@ curl="curl \
  $NIX_CURL_FLAGS"
 
 
+downloadedFile="$out"
+if [ -n "$downloadToTemp" ]; then downloadedFile="$TMPDIR/file"; fi
+
+
 tryDownload() {
     local url="$1"
     echo
     header "trying $url"
     success=
-    if $curl --fail "$url" --output "$out"; then
+    if $curl --fail "$url" --output "$downloadedFile"; then
         success=1
     fi
     stopNest
@@ -30,6 +34,8 @@ tryDownload() {
 
 
 finish() {
+    set +o noglob
+    runHook postFetch
     stopNest
     exit 0
 }
diff --git a/pkgs/build-support/fetchurl/default.nix b/pkgs/build-support/fetchurl/default.nix
index af4a6700153c..c74131a9e607 100644
--- a/pkgs/build-support/fetchurl/default.nix
+++ b/pkgs/build-support/fetchurl/default.nix
@@ -61,6 +61,17 @@ in
 , sha1 ? ""
 , sha256 ? ""
 
+, recursiveHash ? false
+
+, # Shell code executed after the file has been fetched
+  # successfully. This can do things like check or transform the file.
+  postFetch ? ""
+
+, # Whether to download to a temporary path rather than $out. Useful
+  # in conjunction with postFetch. The location of the temporary file
+  # is communicated to postFetch via $downloadedFile.
+  downloadToTemp ? false
+
 , # If set, don't download the file, but write a list of all possible
   # URLs (resulting from resolving mirror:// URLs) to $out.
   showURLs ? false
@@ -87,7 +98,7 @@ stdenv.mkDerivation {
 
   builder = ./builder.sh;
 
-  buildInputs = [curl];
+  buildInputs = [ curl ];
 
   urls = urls_;
 
@@ -101,7 +112,9 @@ stdenv.mkDerivation {
   outputHash = if outputHash != "" then outputHash else
       if sha256 != "" then sha256 else if sha1 != "" then sha1 else md5;
 
-  inherit curlOpts showURLs mirrorsFile impureEnvVars;
+  outputHashMode = if recursiveHash then "recursive" else "flat";
+
+  inherit curlOpts showURLs mirrorsFile impureEnvVars postFetch downloadToTemp;
 
   # Doing the download on a remote machine just duplicates network
   # traffic, so don't do that.
diff --git a/pkgs/build-support/fetchzip/default.nix b/pkgs/build-support/fetchzip/default.nix
new file mode 100644
index 000000000000..7c6e16a05892
--- /dev/null
+++ b/pkgs/build-support/fetchzip/default.nix
@@ -0,0 +1,44 @@
+# This function downloads and unpacks an archive file, such as a zip
+# or tar file. This is primarily useful for dynamically generated
+# archives, such as GitHub's /archive URLs, where the unpacked content
+# of the zip file doesn't change, but the zip file itself may
+# (e.g. due to minor changes in the compression algorithm, or changes
+# in timestamps).
+
+{ lib, fetchurl, unzip }:
+
+{ # Optionally move the contents of the unpacked tree up one level.
+  stripRoot ? true
+, url
+, ... } @ args:
+
+fetchurl ({
+  # Remove the extension, because otherwise unpackPhase will get
+  # confused. FIXME: fix unpackPhase.
+  name = args.name or lib.removeSuffix ".zip" (lib.removeSuffix ".tar.gz" (baseNameOf url));
+
+  recursiveHash = true;
+
+  downloadToTemp = true;
+
+  postFetch =
+    ''
+      export PATH=${unzip}/bin:$PATH
+      mkdir $out
+      cd $out
+      renamed="$TMPDIR/${baseNameOf url}"
+      mv "$downloadedFile" "$renamed"
+      unpackFile "$renamed"
+    ''
+    # FIXME: handle zip files that contain a single regular file.
+    + lib.optionalString stripRoot ''
+      shopt -s dotglob
+      if [ "$(ls -d $out/* | wc -l)" != 1 ]; then
+        echo "error: zip file must contain a single directory."
+        exit 1
+      fi
+      fn=$(cd "$out" && echo *)
+      mv $out/$fn/* "$out/"
+      rmdir "$out/$fn"
+    '';
+} // args)
diff --git a/pkgs/build-support/release/maven-build.nix b/pkgs/build-support/release/maven-build.nix
index 6b47bb9cae90..f7ea07baccbe 100644
--- a/pkgs/build-support/release/maven-build.nix
+++ b/pkgs/build-support/release/maven-build.nix
@@ -70,7 +70,7 @@ stdenv.mkDerivation ( rec {
   '';  
 
   mvnAssembly = ''
-    mvn assembly:assembly -Dmaven.test.skip.exec=true ${mvnFlags}
+    mvn assembly:assembly -Dmaven.test.skip=true ${mvnFlags}
   '';
 
   mvnRelease = ''