Adding dotkit support to TAU.

- New spack.hooks package
  - contains modules with pre and post install hooks

- New dotkit hook module
  - generates/removes dotkits on install/uninstall

- New spack use, spack unuse commands
  - use same syntax as install/uninstall

- New setup-env.bash script
  - Sets up path, dotkit support

- new spack dotkit command
  - used by script to parse specs, generate
    specs of installed pckages for dotkit file names

var/spack/packages/libdwarf/package.py

@@ -29,6 +29,17 @@
 dwarf_dirs = ['libdwarf', 'dwarfdump2']
 
 class Libdwarf(Package):
+    """The DWARF Debugging Information Format is of interest to
+       programmers working on compilers and debuggers (and any one
+       interested in reading or writing DWARF information). It was
+       developed by a committee (known as the PLSIG at the time)
+       starting around 1991. Starting around 1991 SGI developed the
+       libdwarf and dwarfdump tools for internal use and as part of
+       SGI IRIX developer tools. Since that time dwarfdump and
+       libdwarf have been shipped (as an executable and archive
+       respectively, not source) with every release of the SGI
+       MIPS/IRIX C compiler."""
+
     homepage = "http://www.prevanders.net/dwarf.html"
     url      = "http://www.prevanders.net/libdwarf-20130729.tar.gz"
     list_url = homepage

var/spack/packages/tau/package.py

@@ -1,5 +1,8 @@
 from spack import *
 
+import os
+from llnl.util.filesystem import join_path
+
 class Tau(Package):
     """A portable profiling and tracing toolkit for performance
        analysis of parallel programs written in Fortran, C, C++, UPC,
@@ -18,3 +21,16 @@ def install(self, spec, prefix):
         # After that, it's relatively standard.
         configure("-prefix=%s" % prefix)
         make("install")
+
+        # Link arch-specific directories into prefix since there is
+        # only one arch per prefix the way spack installs.
+        self.link_tau_arch_dirs()
+
+
+    def link_tau_arch_dirs(self):
+        for subdir in os.listdir(self.prefix):
+            for d in ('bin', 'lib'):
+                src  = join_path(self.prefix, subdir, d)
+                dest = join_path(self.prefix, d)
+                if os.path.isdir(src) and not os.path.exists(dest):
+                    os.symlink(join_path(subdir, d), dest)