bcache-tools: new package

Bcache is a Linux kernel block layer cache. It allows one or more fast
disk drives such as flash-based solid state drives (SSDs) to act as a
cache for one or more slower hard disk drives.

This package contains the required user-space tools.

User documentation is in Documentation/bcache.txt in the Linux kernel
tree.

http://bcache.evilpiepirate.org/

pkgs/tools/filesystems/bcache-tools/default.nix

@@ -0,0 +1,51 @@
+{ stdenv, fetchurl, pkgconfig, utillinux, kmod }:
+
+stdenv.mkDerivation rec {
+  name = "bcache-tools-${version}";
+  version = "1.0.5";
+
+  src = fetchurl {
+    url = "https://github.com/g2p/bcache-tools/archive/v${version}.tar.gz";
+    sha256 = "1abf86xcnj601lddig3kmn26jrf8q8xhcyszf5pxrcs5ym72jj8l";
+  };
+
+  buildInputs = [ pkgconfig utillinux ];
+
+  # * Remove broken install rules (they ignore $PREFIX) for stuff we don't need
+  #   anyway (it's distro specific stuff).
+  # * Fixup absolute path to modprobe.
+  prePatch = ''
+    sed -e "/INSTALL.*initramfs\/hook/d" \
+        -e "/INSTALL.*initcpio\/install/d" \
+        -e "/INSTALL.*dracut\/module-setup.sh/d" \
+        -i Makefile
+
+    sed -e "s|/sbin/modprobe|${kmod}/sbin/modprobe|" -i bcache-register
+  '';
+
+  preBuild = ''
+    export makeFlags="$makeFlags PREFIX=\"$out\" UDEVLIBDIR=\"$out/lib/udev/\"";
+  '';
+
+  preInstall = ''
+    mkdir -p "$out/sbin" "$out/lib/udev/rules.d" "$out/share/man/man8"
+  '';
+
+  meta = with stdenv.lib; {
+    description = "User-space tools required for bcache (Linux block layer cache)";
+    longDescription = ''
+      Bcache is a Linux kernel block layer cache. It allows one or more fast
+      disk drives such as flash-based solid state drives (SSDs) to act as a
+      cache for one or more slower hard disk drives.
+      
+      This package contains the required user-space tools.
+
+      User documentation is in Documentation/bcache.txt in the Linux kernel
+      tree.
+    '';
+    homepage = http://bcache.evilpiepirate.org/;
+    license = licenses.gpl2;
+    platforms = platforms.linux;
+    maintainers = [ maintainers.bjornfor ];
+  };
+}

pkgs/top-level/all-packages.nix

@@ -532,6 +532,8 @@ let
 
   bc = callPackage ../tools/misc/bc { };
 
+  bcache-tools = callPackage ../tools/filesystems/bcache-tools { };
+
   bchunk = callPackage ../tools/cd-dvd/bchunk { };
 
   bfr = callPackage ../tools/misc/bfr { };