Initial version of spack with one package: cmake

23 files changed, 1094 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000000..5527bf8f05
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,4 @@
+*.pyc
+/opt/
+/var/
+*~
diff --git a/bin/spack b/bin/spack
new file mode 100755
index 0000000000..1fd47d5e8c
--- /dev/null
+++ b/bin/spack
@@ -0,0 +1,41 @@
+#!/usr/bin/env python
+
+import os
+import sys
+import argparse
+
+# Find spack's location and its prefix.
+SPACK_FILE = os.environ["SPACK_FILE"] = os.path.expanduser(__file__)
+SPACK_PREFIX = os.path.dirname(os.path.dirname(SPACK_FILE))
+
+# Allow spack libs to be imported in our scripts
+SPACK_LIB_PATH = os.path.join(SPACK_PREFIX, "lib", "spack")
+sys.path.insert(0, SPACK_LIB_PATH)
+
+# clean up the scope and start using spack package instead.
+del SPACK_FILE, SPACK_PREFIX, SPACK_LIB_PATH
+import spack
+
+# Command parsing
+parser = argparse.ArgumentParser(
+    description='Spack: the Supercomputing PACKage Manager.')
+parser.add_argument('-V', '--version', action='version', version="%s" % spack.version)
+parser.add_argument('-v', '--verbose', action='store_true', dest='verbose')
+
+# each command module implements a parser() function, to which we pass its
+# subparser for setup.
+subparsers = parser.add_subparsers(title="subcommands", dest="command")
+
+import spack.cmd
+for cmd in spack.cmd.commands:
+    subparser = subparsers.add_parser(cmd)
+    module = spack.cmd.get_module(cmd)
+    module.setup_parser(subparser)
+args = parser.parse_args()
+
+# Set up environment based on args.
+spack.verbose = args.verbose
+
+# Try to load the particular command asked for and run it
+command = spack.cmd.get_command(args.command)
+command(args)
diff --git a/lib/spack/spack/Package.py b/lib/spack/spack/Package.py
new file mode 100644
index 0000000000..3fdbbe16f8
--- /dev/null
+++ b/lib/spack/spack/Package.py
@@ -0,0 +1,168 @@
+import inspect
+import os
+import re
+import subprocess
+
+from spack import *
+import tty
+import attr
+import validate
+import version
+import shutil
+import platform
+from stage import Stage
+
+def depends_on(*args, **kwargs):
+    """Adds a depends_on local variable in the locals of
+       the calling class, based on args.
+    """
+    stack = inspect.stack()
+    try:
+        locals = stack[1][0].f_locals
+    finally:
+        del stack
+    print locals
+
+    locals["depends_on"] = kwargs
+
+
+class Package(object):
+    def __init__(self):
+        attr.required(self, 'homepage')
+        attr.required(self, 'url')
+        attr.required(self, 'md5')
+
+        # Name of package is just the classname lowercased
+        self.name = self.__class__.__name__.lower()
+
+        # Make sure URL is an allowed type
+        validate.url(self.url)
+
+        v = version.parse(self.url)
+        if not v:
+            tty.die("Couldn't extract version from '%s'. " +
+                    "You must specify it explicitly for this URL." % self.url)
+        self.version = v
+
+    @property
+    def stage(self):
+        return Stage(self.stage_name)
+
+    @property
+    def stage_name(self):
+        return "%s-%s" % (self.name, self.version)
+
+    @property
+    def prefix(self):
+        return new_path(install_path, self.stage_name)
+
+    def do_fetch(self):
+        """Creates a stage directory and downloads the taball for this package.
+           Working directory will be set to the stage directory.
+        """
+        stage = self.stage
+        stage.setup()
+        stage.chdir()
+
+        archive_file = os.path.basename(self.url)
+        if not os.path.exists(archive_file):
+            tty.msg("Fetching %s" % self.url)
+
+            # Run curl but grab the mime type from the http headers
+            headers = curl('-#', '-O', '-D', '-', self.url, return_output=True)
+
+            # output this if we somehow got an HTML file rather than the archive we
+            # asked for.
+            if re.search(r'Content-Type: text/html', headers):
+                tty.warn("The contents of '%s' look like HTML.  The checksum will "+
+                         "likely fail.  Use 'spack clean %s' to delete this file. "
+                         "The fix the gateway issue and install again." % (archive_file, self.name))
+
+            if not os.path.exists(archive_file):
+                tty.die("Failed to download '%s'!" % self.url)
+        else:
+            tty.msg("Already downloaded %s." % self.name)
+
+        archive_md5 = md5(archive_file)
+        if archive_md5 != self.md5:
+            tty.die("MD5 Checksum failed for %s.  Expected %s but got %s."
+                    % (self.name, self.md5, archive_md5))
+
+        return archive_file
+
+    def do_stage(self):
+        """Unpacks the fetched tarball, then changes into the expanded tarball directory."""
+        archive_file = self.do_fetch()
+        stage = self.stage
+
+        archive_dir = stage.archive_path
+        if not archive_dir:
+            tty.msg("Staging archive: '%s'" % archive_file)
+            decompress = decompressor_for(archive_file)
+            decompress(archive_file)
+        else:
+            tty.msg("Alredy staged %s" % self.name)
+
+        stage.chdir_to_archive()
+
+    def do_install(self):
+        """This class should call this version of the install method.
+           Package implementations should override install().
+        """
+        if os.path.exists(self.prefix):
+            tty.msg("%s is already installed." % self.name)
+            tty.pkg(self.prefix)
+            return
+
+        self.do_stage()
+
+        # Populate the module scope of install() with some useful functions.
+        # This makes things easier for package writers.
+        self.module.configure = which("configure", [self.stage.archive_path])
+        self.module.cmake = which("cmake")
+
+        self.install(self.prefix)
+        tty.msg("Successfully installed %s" % self.name)
+        tty.pkg(self.prefix)
+
+    @property
+    def module(self):
+        """Use this to add variables to the class's module's scope.
+           This lets us use custom syntax in the install method.
+        """
+        return __import__(self.__class__.__module__,
+                          fromlist=[self.__class__.__name__])
+
+    def install(self, prefix):
+        """Package implementations override this with their own build configuration."""
+        tty.die("Packages must provide an install method!")
+
+    def do_uninstall(self):
+        self.uninstall(self.prefix)
+        tty.msg("Successfully uninstalled %s." % self.name)
+
+    def uninstall(self, prefix):
+        """By default just blows the install dir away."""
+        shutil.rmtree(self.prefix, True)
+
+    def do_clean(self):
+        self.clean()
+
+    def clean(self):
+        """By default just runs make clean.  Override if this isn't good."""
+        stage = self.stage
+        if stage.archive_path:
+            stage.chdir_to_archive()
+            try:
+                make("clean")
+                tty.msg("Successfully cleaned %s" % self.name)
+            except subprocess.CalledProcessError:
+                # Might not be configured.  Ignore.
+                pass
+
+    def do_clean_all(self):
+        if os.path.exists(self.stage.path):
+            self.stage.destroy()
+        tty.msg("Successfully cleaned %s" % self.name)
+
+
diff --git a/lib/spack/spack/__init__.py b/lib/spack/spack/__init__.py
new file mode 100644
index 0000000000..15dc99c866
--- /dev/null
+++ b/lib/spack/spack/__init__.py
@@ -0,0 +1,5 @@
+
+from globals import *
+from fileutils import *
+
+from Package import Package, depends_on
diff --git a/lib/spack/spack/attr.py b/lib/spack/spack/attr.py
new file mode 100644
index 0000000000..03fc6e1463
--- /dev/null
+++ b/lib/spack/spack/attr.py
@@ -0,0 +1,8 @@
+import spack.tty as tty
+
+def required(obj, attr_name):
+    """Ensure that a class has a required attribute."""
+    if not hasattr(obj, attr_name):
+        tty.die("No required attribute '%s' in class '%s'"
+                % (attr_name, obj.__class__.__name__))
+
diff --git a/lib/spack/spack/cmd/__init__.py b/lib/spack/spack/cmd/__init__.py
new file mode 100644
index 0000000000..20c4685e1b
--- /dev/null
+++ b/lib/spack/spack/cmd/__init__.py
@@ -0,0 +1,36 @@
+import os
+import re
+
+import spack
+import spack.tty as tty
+
+SETUP_PARSER = "setup_parser"
+command_path = os.path.join(spack.lib_path, "spack", "cmd")
+
+commands = []
+for file in os.listdir(command_path):
+    if file.endswith(".py") and not file == "__init__.py":
+        cmd = re.sub(r'.py$', '', file)
+        commands.append(cmd)
+commands.sort()
+
+def null_op(*args):
+    pass
+
+
+def get_module(name):
+    """Imports the module for a particular command name and returns it."""
+    module_name = "%s.%s" % (__name__, name)
+    module = __import__(module_name, fromlist=[name, SETUP_PARSER], level=0)
+    module.setup_parser = getattr(module, SETUP_PARSER, null_op)
+
+    if not hasattr(module, name):
+        tty.die("Command module %s (%s) must define function '%s'."
+                % (module.__name__, module.__file__, name))
+
+    return module
+
+
+def get_command(name):
+    """Imports the command's function from a module and returns it."""
+    return getattr(get_module(name), name)
diff --git a/lib/spack/spack/cmd/arch.py b/lib/spack/spack/cmd/arch.py
new file mode 100644
index 0000000000..fdbed800b1
--- /dev/null
+++ b/lib/spack/spack/cmd/arch.py
@@ -0,0 +1,12 @@
+from spack import *
+import spack.version as version
+
+import multiprocessing
+import platform
+
+def arch(args):
+    print multiprocessing.cpu_count()
+    print platform.mac_ver()
+
+
+    print version.canonical(platform.mac_ver()[0])
diff --git a/lib/spack/spack/cmd/clean.py b/lib/spack/spack/cmd/clean.py
new file mode 100644
index 0000000000..eecfb011e3
--- /dev/null
+++ b/lib/spack/spack/cmd/clean.py
@@ -0,0 +1,16 @@
+import spack.packages as packages
+
+def setup_parser(subparser):
+    subparser.add_argument('name', help="name of package to clean")
+    subparser.add_argument('-a', "--all", action="store_true", dest="all",
+                           help="delete the entire stage directory")
+
+def clean(args):
+    package_class = packages.get(args.name)
+    package = package_class()
+    if args.all:
+        package.do_clean_all()
+    else:
+        package.do_clean()
+
+
diff --git a/lib/spack/spack/cmd/create.py b/lib/spack/spack/cmd/create.py
new file mode 100644
index 0000000000..3354831508
--- /dev/null
+++ b/lib/spack/spack/cmd/create.py
@@ -0,0 +1,57 @@
+import string
+
+import spack
+import spack.packages as packages
+import spack.tty as tty
+import spack.version
+
+pacakge_tempate = string.Template("""\
+from spack import *
+
+class $name(Package):
+    homepage = "${homepage}"
+    url      = "${url}"
+    md5      = "${md5}"
+
+    def install(self):
+        # Insert your installation code here.
+        pass
+""")
+
+def create_template(name):
+    class_name = name.capitalize()
+    return new_pacakge_tempate % class_name
+
+
+def setup_parser(subparser):
+    subparser.add_argument('url', nargs='?', help="url of package archive")
+
+
+def create(args):
+    url = args.url
+
+    version = spack.version.parse(url)
+    if not version:
+        tty.die("Couldn't figure out a version string from '%s'." % url)
+
+
+
+    # By default open the directory where packages live.
+    if not name:
+        path = spack.packages_path
+    else:
+        path = packages.filename_for(name)
+
+        if os.path.exists(path):
+            if not os.path.isfile(path):
+                tty.die("Something's wrong.  '%s' is not a file!" % path)
+            if not os.access(path, os.R_OK|os.W_OK):
+                tty.die("Insufficient permissions on '%s'!" % path)
+        else:
+            tty.msg("Editing new file: '%s'." % path)
+            file = open(path, "w")
+            file.write(create_template(name))
+            file.close()
+
+    # If everything checks out, go ahead and edit.
+    spack.editor(path)
diff --git a/lib/spack/spack/cmd/edit.py b/lib/spack/spack/cmd/edit.py
new file mode 100644
index 0000000000..6efcc5487e
--- /dev/null
+++ b/lib/spack/spack/cmd/edit.py
@@ -0,0 +1,50 @@
+import os
+import spack
+import spack.packages as packages
+import spack.tty as tty
+
+new_pacakge_tempate = """\
+from spack import *
+
+class %s(Package):
+    homepage = "https://www.example.com"
+    url      = "https://www.example.com/download/example-1.0.tar.gz"
+    md5      = "nomd5"
+
+    def install(self):
+        # Insert your installation code here.
+        pass
+
+"""
+
+def create_template(name):
+    class_name = name.capitalize()
+    return new_pacakge_tempate % class_name
+
+
+def setup_parser(subparser):
+    subparser.add_argument(
+        'name', nargs='?', default=None, help="name of package to edit")
+
+def edit(args):
+    name = args.name
+
+    # By default open the directory where packages live.
+    if not name:
+        path = spack.packages_path
+    else:
+        path = packages.filename_for(name)
+
+        if os.path.exists(path):
+            if not os.path.isfile(path):
+                tty.die("Something's wrong.  '%s' is not a file!" % path)
+            if not os.access(path, os.R_OK|os.W_OK):
+                tty.die("Insufficient permissions on '%s'!" % path)
+        else:
+            tty.msg("Editing new file: '%s'." % path)
+            file = open(path, "w")
+            file.write(create_template(name))
+            file.close()
+
+    # If everything checks out, go ahead and edit.
+    spack.editor(path)
diff --git a/lib/spack/spack/cmd/fetch.py b/lib/spack/spack/cmd/fetch.py
new file mode 100644
index 0000000000..8682a76a1b
--- /dev/null
+++ b/lib/spack/spack/cmd/fetch.py
@@ -0,0 +1,9 @@
+import spack.packages as packages
+
+def setup_parser(subparser):
+    subparser.add_argument('name', help="name of package to fetch")
+
+def fetch(args):
+    package_class = packages.get(args.name)
+    package = package_class()
+    package.do_fetch()
diff --git a/lib/spack/spack/cmd/install.py b/lib/spack/spack/cmd/install.py
new file mode 100644
index 0000000000..f946e49ba3
--- /dev/null
+++ b/lib/spack/spack/cmd/install.py
@@ -0,0 +1,11 @@
+import spack.packages as packages
+
+def setup_parser(subparser):
+    subparser.add_argument('name', help="name of package to install")
+
+def install(args):
+    package_class = packages.get(args.name)
+    package = package_class()
+    package.do_install()
+
+
diff --git a/lib/spack/spack/cmd/stage.py b/lib/spack/spack/cmd/stage.py
new file mode 100644
index 0000000000..da7cb4a636
--- /dev/null
+++ b/lib/spack/spack/cmd/stage.py
@@ -0,0 +1,9 @@
+import spack.packages as packages
+
+def setup_parser(subparser):
+    subparser.add_argument('name', help="name of package to stage")
+
+def stage(args):
+    package_class = packages.get(args.name)
+    package = package_class()
+    package.do_stage()
diff --git a/lib/spack/spack/cmd/uninstall.py b/lib/spack/spack/cmd/uninstall.py
new file mode 100644
index 0000000000..d618845e55
--- /dev/null
+++ b/lib/spack/spack/cmd/uninstall.py
@@ -0,0 +1,9 @@
+import spack.packages as packages
+
+def setup_parser(subparser):
+    subparser.add_argument('name', help="name of package to uninstall")
+
+def uninstall(args):
+    package_class = packages.get(args.name)
+    package = package_class()
+    package.do_uninstall()
diff --git a/lib/spack/spack/fileutils.py b/lib/spack/spack/fileutils.py
new file mode 100644
index 0000000000..6827e5d1f0
--- /dev/null
+++ b/lib/spack/spack/fileutils.py
@@ -0,0 +1,112 @@
+import os
+import subprocess
+import re
+from itertools import product
+from contextlib import closing
+
+import tty
+
+# Supported archvie extensions.
+PRE_EXTS = ["tar"]
+EXTS     = ["gz", "bz2", "xz", "Z", "zip", "tgz"]
+
+# Add EXTS last so that .tar.gz is matched *before* tar.gz
+ALLOWED_ARCHIVE_TYPES = [".".join(l) for l in product(PRE_EXTS, EXTS)] + EXTS
+
+
+def has_whitespace(string):
+    return re.search(r'\s', string)
+
+
+def new_path(prefix, *args):
+    path=prefix
+    for elt in args:
+        path = os.path.join(path, elt)
+
+    if has_whitespace(path):
+        tty.die("Invalid path: '%s'.  Use a path without whitespace.")
+
+    return path
+
+
+def ancestor(dir, n=1):
+    """Get the nth ancestor of a directory."""
+    parent = os.path.abspath(dir)
+    for i in range(n):
+        parent = os.path.dirname(parent)
+    return parent
+
+
+class Executable(object):
+    """Class representing a program that can be run on the command line."""
+    def __init__(self, name):
+        self.exe = name.split(' ')
+
+    def add_default_arg(self, arg):
+        self.exe.append(arg)
+
+    def __call__(self, *args, **kwargs):
+        """Run the executable with subprocess.check_output, return output."""
+        return_output = kwargs.get("return_output", False)
+
+        quoted_args = [arg for arg in args if re.search(r'^"|^\'|"$|\'$', arg)]
+        if quoted_args:
+            tty.warn("Quotes in package command arguments can confuse shell scripts like configure.",
+                     "The following arguments may cause problems when executed:",
+                     str("\n".join(["    "+arg for arg in quoted_args])),
+                     "Quotes aren't needed because spack doesn't use a shell.  Consider removing them")
+
+        cmd = self.exe + list(args)
+        tty.verbose(cmd)
+
+        if return_output:
+            return subprocess.check_output(cmd)
+        else:
+            return subprocess.check_call(cmd)
+
+    def __repr__(self):
+        return "<exe: %s>" % self.exe
+
+
+def which(name, path=None):
+    """Finds an executable in the path like command-line which."""
+    if not path:
+        path = os.environ.get('PATH', '').split(os.pathsep)
+    if not path:
+        return None
+
+    for dir in path:
+        exe = os.path.join(dir, name)
+        if os.access(exe, os.X_OK):
+            return Executable(exe)
+    return None
+
+
+def stem(path):
+    """Get the part of a path that does not include its compressed
+       type extension."""
+    for type in ALLOWED_ARCHIVE_TYPES:
+        suffix = r'\.%s$' % type
+        if re.search(suffix, path):
+            return re.sub(suffix, "", path)
+    return path
+
+
+def decompressor_for(path):
+    """Get the appropriate decompressor for a path."""
+    if which("tar"):
+        return Executable("tar -xf")
+    else:
+        tty.die("spack requires tar.  Make sure it's on your path.")
+
+
+def md5(filename, block_size=2**20):
+    import hashlib
+    md5 = hashlib.md5()
+    with closing(open(filename)) as file:
+        while True:
+            data = file.read(block_size)
+            if not data:
+                break
+            md5.update(data)
+        return md5.hexdigest()
diff --git a/lib/spack/spack/globals.py b/lib/spack/spack/globals.py
new file mode 100644
index 0000000000..66cc6ce157
--- /dev/null
+++ b/lib/spack/spack/globals.py
@@ -0,0 +1,42 @@
+import os
+import re
+import multiprocessing
+from version import Version
+
+import tty
+from fileutils import *
+
+# This lives in $prefix/lib/spac/spack/__file__
+prefix = ancestor(__file__, 4)
+
+# The spack script itself
+spack_file = new_path(prefix, "bin", "spack")
+
+# spack directory hierarchy
+lib_path      = new_path(prefix, "lib", "spack")
+module_path   = new_path(lib_path, "spack")
+packages_path = new_path(module_path, "packages")
+
+var_path      = new_path(prefix, "var", "spack")
+stage_path    = new_path(var_path, "stage")
+
+install_path  = new_path(prefix, "opt")
+
+# Version information
+version = Version("0.1")
+
+# User's editor from the environment
+editor = Executable(os.environ.get("EDITOR", ""))
+
+# Curl tool for fetching files.
+curl = which("curl")
+if not curl:
+    tty.die("spack requires curl.  Make sure it is in your path.")
+
+make = which("make")
+make.add_default_arg("-j%d" % multiprocessing.cpu_count())
+if not make:
+    tty.die("spack requires make.  Make sure it is in your path.")
+
+verbose = False
+debug = False
diff --git a/lib/spack/spack/packages/__init__.py b/lib/spack/spack/packages/__init__.py
new file mode 100644
index 0000000000..2aadfc612f
--- /dev/null
+++ b/lib/spack/spack/packages/__init__.py
@@ -0,0 +1,35 @@
+import spack
+from spack.fileutils import *
+
+import re
+import inspect
+
+
+def filename_for(package):
+    """Get the filename where a package name should be stored."""
+    return new_path(spack.packages_path, "%s.py" % package.lower())
+
+
+def get(name):
+    file = filename_for(name)
+
+    if os.path.exists(file):
+        if not os.path.isfile(file):
+            tty.die("Something's wrong. '%s' is not a file!" % file)
+        if not os.access(file, os.R_OK):
+            tty.die("Cannot read '%s'!" % file)
+
+    class_name = name.capitalize()
+    try:
+        module_name = "%s.%s" % (__name__, name)
+        module = __import__(module_name, fromlist=[class_name])
+    except ImportError, e:
+        tty.die("Error while importing %s.%s:\n%s" % (name, class_name, e.message))
+
+    klass = getattr(module, class_name)
+    if not inspect.isclass(klass):
+        tty.die("%s.%s is not a class" % (name, class_name))
+
+    return klass
+
+
diff --git a/lib/spack/spack/packages/cmake.py b/lib/spack/spack/packages/cmake.py
new file mode 100644
index 0000000000..57cb0d9cf9
--- /dev/null
+++ b/lib/spack/spack/packages/cmake.py
@@ -0,0 +1,11 @@
+from spack import *
+
+class Cmake(Package):
+    homepage  = 'https://www.cmake.org'
+    url       = 'http://www.cmake.org/files/v2.8/cmake-2.8.10.2.tar.gz'
+    md5       = '097278785da7182ec0aea8769d06860c'
+
+    def install(self, prefix):
+        configure('--prefix=%s' % prefix)
+        make()
+        make('install')
diff --git a/lib/spack/spack/stage.py b/lib/spack/spack/stage.py
new file mode 100644
index 0000000000..8585c75976
--- /dev/null
+++ b/lib/spack/spack/stage.py
@@ -0,0 +1,68 @@
+import os
+import shutil
+
+import spack
+import tty
+
+
+def ensure_access(dir=spack.stage_path):
+    if not os.access(dir, os.R_OK|os.W_OK):
+        tty.die("Insufficient permissions on directory '%s'" % dir)
+
+
+class Stage(object):
+    def __init__(self, stage_name):
+        self.stage_name = stage_name
+
+    @property
+    def path(self):
+        return spack.new_path(spack.stage_path, self.stage_name)
+
+
+    def setup(self):
+        if os.path.exists(self.path):
+            if not os.path.isdir(self.path):
+                tty.die("Stage path '%s' is not a directory!" % self.path)
+        else:
+            os.makedirs(self.path)
+
+        ensure_access(self.path)
+
+
+    @property
+    def archive_path(self):
+        """"Returns the path to the expanded archive directory if it's expanded;
+            None if the archive hasn't been expanded.
+        """
+        for file in os.listdir(self.path):
+            archive_path = spack.new_path(self.path, file)
+            if os.path.isdir(archive_path):
+                return archive_path
+        return None
+
+
+    def chdir(self):
+        """Changes directory to the stage path.  Or dies if it is not set up."""
+        if os.path.isdir(self.path):
+            os.chdir(self.path)
+        else:
+            tty.die("Attempt to chdir to stage before setup.")
+
+
+    def chdir_to_archive(self):
+        """Changes directory to the expanded archive directory if it exists.
+           Dies with an error otherwise.
+        """
+        path = self.archive_path
+        if not path:
+            tty.die("Attempt to chdir before expanding archive.")
+        else:
+            os.chdir(path)
+            if not os.listdir(path):
+                tty.die("Archive was empty for '%s'" % self.name)
+
+
+    def destroy(self):
+        """Blows away the stage directory.  Can always call setup() again."""
+        if os.path.exists(self.path):
+            shutil.rmtree(self.path, True)
diff --git a/lib/spack/spack/test/test_versions.py b/lib/spack/spack/test/test_versions.py
new file mode 100755
index 0000000000..e7ebae630b
--- /dev/null
+++ b/lib/spack/spack/test/test_versions.py
@@ -0,0 +1,189 @@
+#!/usr/bin/env python
+"""\
+This file has a bunch of versions tests taken from the excellent version
+detection in Homebrew.
+"""
+import spack.version as version
+import unittest
+
+
+class VersionTest(unittest.TestCase):
+
+    def assert_not_detected(self, string):
+        self.assertIsNone(version.parse(string))
+
+    def assert_detected(self, v, string):
+        self.assertEqual(v, version.parse(string))
+
+    def test_wwwoffle_version(self):
+        self.assert_detected(
+            '2.9h', 'http://www.gedanken.demon.co.uk/download-wwwoffle/wwwoffle-2.9h.tgz')
+
+    def test_version_sourceforge_download(self):
+        self.assert_detected(
+            '1.21', 'http://sourceforge.net/foo_bar-1.21.tar.gz/download')
+        self.assert_detected(
+            '1.21', 'http://sf.net/foo_bar-1.21.tar.gz/download')
+
+    def test_no_version(self):
+        self.assert_not_detected('http://example.com/blah.tar')
+        self.assert_not_detected('foo')
+
+    def test_version_all_dots(self):
+        self.assert_detected(
+            '1.14','http://example.com/foo.bar.la.1.14.zip')
+
+    def test_version_underscore_separator(self):
+        self.assert_detected(
+            '1.1', 'http://example.com/grc_1.1.tar.gz')
+
+    def test_boost_version_style(self):
+        self.assert_detected(
+            '1.39.0', 'http://example.com/boost_1_39_0.tar.bz2')
+
+    def test_erlang_version_style(self):
+        self.assert_detected(
+            'R13B', 'http://erlang.org/download/otp_src_R13B.tar.gz')
+
+    def test_another_erlang_version_style(self):
+        self.assert_detected(
+            'R15B01', 'https://github.com/erlang/otp/tarball/OTP_R15B01')
+
+    def test_yet_another_erlang_version_style(self):
+        self.assert_detected(
+            'R15B03-1', 'https://github.com/erlang/otp/tarball/OTP_R15B03-1')
+
+    def test_p7zip_version_style(self):
+        self.assert_detected(
+            '9.04',
+            'http://kent.dl.sourceforge.net/sourceforge/p7zip/p7zip_9.04_src_all.tar.bz2')
+
+    def test_new_github_style(self):
+        self.assert_detected(
+            '1.1.4', 'https://github.com/sam-github/libnet/tarball/libnet-1.1.4')
+
+    def test_gloox_beta_style(self):
+        self.assert_detected(
+            '1.0-beta7', 'http://camaya.net/download/gloox-1.0-beta7.tar.bz2')
+
+    def test_sphinx_beta_style(self):
+        self.assert_detected(
+            '1.10-beta', 'http://sphinxsearch.com/downloads/sphinx-1.10-beta.tar.gz')
+
+    def test_astyle_verson_style(self):
+        self.assert_detected(
+            '1.23', 'http://kent.dl.sourceforge.net/sourceforge/astyle/astyle_1.23_macosx.tar.gz')
+
+    def test_version_dos2unix(self):
+        self.assert_detected(
+            '3.1', 'http://www.sfr-fresh.com/linux/misc/dos2unix-3.1.tar.gz')
+
+    def test_version_internal_dash(self):
+        self.assert_detected(
+            '1.1-2', 'http://example.com/foo-arse-1.1-2.tar.gz')
+
+    def test_version_single_digit(self):
+        self.assert_detected(
+            '45', 'http://example.com/foo_bar.45.tar.gz')
+
+    def test_noseparator_single_digit(self):
+        self.assert_detected(
+            '45', 'http://example.com/foo_bar45.tar.gz')
+
+    def test_version_developer_that_hates_us_format(self):
+        self.assert_detected(
+            '1.2.3', 'http://example.com/foo-bar-la.1.2.3.tar.gz')
+
+    def test_version_regular(self):
+        self.assert_detected(
+            '1.21', 'http://example.com/foo_bar-1.21.tar.gz')
+
+    def test_version_github(self):
+        self.assert_detected(
+            '1.0.5', 'http://github.com/lloyd/yajl/tarball/1.0.5')
+
+    def test_version_github_with_high_patch_number(self):
+        self.assert_detected(
+            '1.2.34', 'http://github.com/lloyd/yajl/tarball/v1.2.34')
+
+    def test_yet_another_version(self):
+        self.assert_detected(
+            '0.15.1b', 'http://example.com/mad-0.15.1b.tar.gz')
+
+    def test_lame_version_style(self):
+        self.assert_detected(
+            '398-2', 'http://kent.dl.sourceforge.net/sourceforge/lame/lame-398-2.tar.gz')
+
+    def test_ruby_version_style(self):
+        self.assert_detected(
+            '1.9.1-p243', 'ftp://ftp.ruby-lang.org/pub/ruby/1.9/ruby-1.9.1-p243.tar.gz')
+
+    def test_omega_version_style(self):
+        self.assert_detected(
+            '0.80.2', 'http://www.alcyone.com/binaries/omega/omega-0.80.2-src.tar.gz')
+
+    def test_rc_style(self):
+        self.assert_detected(
+            '1.2.2rc1', 'http://downloads.xiph.org/releases/vorbis/libvorbis-1.2.2rc1.tar.bz2')
+
+    def test_dash_rc_style(self):
+        self.assert_detected(
+            '1.8.0-rc1', 'http://ftp.mozilla.org/pub/mozilla.org/js/js-1.8.0-rc1.tar.gz')
+
+    def test_angband_version_style(self):
+        self.assert_detected(
+            '3.0.9b', 'http://rephial.org/downloads/3.0/angband-3.0.9b-src.tar.gz')
+
+    def test_stable_suffix(self):
+        self.assert_detected(
+            '1.4.14b', 'http://www.monkey.org/~provos/libevent-1.4.14b-stable.tar.gz')
+
+    def test_debian_style_1(self):
+        self.assert_detected(
+            '3.03', 'http://ftp.de.debian.org/debian/pool/main/s/sl/sl_3.03.orig.tar.gz')
+
+    def test_debian_style_2(self):
+        self.assert_detected(
+            '1.01b', 'http://ftp.de.debian.org/debian/pool/main/m/mmv/mmv_1.01b.orig.tar.gz')
+
+    def test_imagemagick_style(self):
+        self.assert_detected(
+            '6.7.5-7', 'http://downloads.sf.net/project/machomebrew/mirror/ImageMagick-6.7.5-7.tar.bz2')
+
+    def test_dash_version_dash_style(self):
+        self.assert_detected(
+            '3.4', 'http://www.antlr.org/download/antlr-3.4-complete.jar')
+
+    def test_apache_version_style(self):
+        self.assert_detected(
+            '1.2.0-rc2', 'http://www.apache.org/dyn/closer.cgi?path=/cassandra/1.2.0/apache-cassandra-1.2.0-rc2-bin.tar.gz')
+
+    def test_jpeg_style(self):
+        self.assert_detected(
+            '8d', 'http://www.ijg.org/files/jpegsrc.v8d.tar.gz')
+
+    def test_more_versions(self):
+        self.assert_detected(
+            '1.4.1', 'http://pypy.org/download/pypy-1.4.1-osx.tar.bz2')
+        self.assert_detected(
+            '0.9.8s', 'http://www.openssl.org/source/openssl-0.9.8s.tar.gz')
+        self.assert_detected(
+            '1.5E', 'ftp://ftp.visi.com/users/hawkeyd/X/Xaw3d-1.5E.tar.gz')
+        self.assert_detected(
+            '2.1.0beta', 'http://downloads.sourceforge.net/project/fann/fann/2.1.0beta/fann-2.1.0beta.zip')
+        self.assert_detected(
+            '2.0.1', 'ftp://iges.org/grads/2.0/grads-2.0.1-bin-darwin9.8-intel.tar.gz')
+        self.assert_detected(
+            '2.08', 'http://haxe.org/file/haxe-2.08-osx.tar.gz')
+        self.assert_detected(
+            '2007f', 'ftp://ftp.cac.washington.edu/imap/imap-2007f.tar.gz')
+        self.assert_detected(
+            '3.3.12ga7', 'http://sourceforge.net/projects/x3270/files/x3270/3.3.12ga7/suite3270-3.3.12ga7-src.tgz')
+        self.assert_detected(
+            '1.3.6p2', 'http://synergy.googlecode.com/files/synergy-1.3.6p2-MacOSX-Universal.zip')
+
+
+
+
+if __name__ == "__main__":
+    unittest.main()
diff --git a/lib/spack/spack/tty.py b/lib/spack/spack/tty.py
new file mode 100644
index 0000000000..b7b27d2e3b
--- /dev/null
+++ b/lib/spack/spack/tty.py
@@ -0,0 +1,63 @@
+import sys
+import spack
+
+indent = "  "
+
+def escape(s):
+    """Returns a TTY escape code if stdout is a tty, otherwise empty string"""
+    if sys.stdout.isatty():
+        return "\033[{}m".format(s)
+    return ''
+
+def color(n):
+    return escape("0;{}".format(n))
+
+def bold(n):
+    return escape("1;{}".format(n))
+
+def underline(n):
+    return escape("4;{}".format(n))
+
+blue   = bold(34)
+white  = bold(39)
+red    = bold(31)
+yellow = underline(33)
+green  = bold(92)
+gray   = bold(30)
+em     = underline(39)
+reset  = escape(0)
+
+def msg(msg, *args, **kwargs):
+    color = kwargs.get("color", blue)
+    print "{}==>{} {}{}".format(color, white, str(msg), reset)
+    for arg in args: print indent + str(arg)
+
+def verbose(*args):
+    if spack.verbose: msg(*args, color=green)
+
+def debug(*args):
+    if spack.debug: msg(*args, color=red)
+
+def error(msg, *args):
+    print "{}Error{}: {}".format(red, reset, str(msg))
+    for arg in args: print indent + str(arg)
+
+def warn(msg, *args):
+    print "{}Warning{}: {}".format(yellow, reset, str(msg))
+    for arg in args: print indent + str(arg)
+
+def die(msg):
+    error(msg)
+    sys.exit(1)
+
+def pkg(msg):
+    """Outputs a message with a package icon."""
+    import platform
+    from version import Version
+
+    mac_version = platform.mac_ver()[0]
+    if Version(mac_version) >= Version("10.7"):
+        print u"\U0001F4E6" + indent,
+    else:
+        print '[%] ',
+    print msg
diff --git a/lib/spack/spack/validate.py b/lib/spack/spack/validate.py
new file mode 100644
index 0000000000..312517f42a
--- /dev/null
+++ b/lib/spack/spack/validate.py
@@ -0,0 +1,13 @@
+import tty
+from fileutils import ALLOWED_ARCHIVE_TYPES
+from urlparse import urlparse
+
+ALLOWED_SCHEMES    = ["http", "https", "ftp"]
+
+def url(url_string):
+    url = urlparse(url_string)
+    if url.scheme not in ALLOWED_SCHEMES:
+        tty.die("Invalid protocol in URL: '%s'" % url_string)
+
+    if not any(url_string.endswith(t) for t in ALLOWED_ARCHIVE_TYPES):
+        tty.die("Invalid file type in URL: '%s'" % url_string)
diff --git a/lib/spack/spack/version.py b/lib/spack/spack/version.py
new file mode 100644
index 0000000000..e3fdd1c826
--- /dev/null
+++ b/lib/spack/spack/version.py
@@ -0,0 +1,126 @@
+import os
+import re
+
+import fileutils
+
+class Version(object):
+    """Class to represent versions"""
+    def __init__(self, version_string):
+        self.version_string = version_string
+        self.version = canonical(version_string)
+
+    def __cmp__(self, other):
+        return cmp(self.version, other.version)
+
+    @property
+    def major(self):
+        return self.component(0)
+
+    @property
+    def minor(self):
+        return self.component(1)
+
+    @property
+    def patch(self):
+        return self.component(2)
+
+    def component(self, i):
+        """Returns the ith version component"""
+        if len(self.version) > i:
+            return self.version[i]
+        else:
+            return None
+
+    def __repr__(self):
+        return self.version_string
+
+    def __str__(self):
+        return self.version_string
+
+
+def canonical(v):
+    """Get a "canonical" version of a version string, as a tuple."""
+    def intify(part):
+        try:
+            return int(part)
+        except:
+            return part
+    return tuple(intify(v) for v in re.split(r'[_.-]+', v))
+
+
+def parse(spec):
+    """Try to extract a version from a filename.  This is taken largely from
+    Homebrew's Version class."""
+
+    if os.path.isdir(spec):
+        stem = os.path.basename(spec)
+    elif re.search(r'((?:sourceforge.net|sf.net)/.*)/download$', spec):
+        stem = fileutils.stem(os.path.dirname(spec))
+    else:
+        stem = fileutils.stem(spec)
+
+    version_types = [
+        # GitHub tarballs, e.g. v1.2.3
+        (r'github.com/.+/(?:zip|tar)ball/v?((\d+\.)+\d+)$', spec),
+
+        # e.g. https://github.com/sam-github/libnet/tarball/libnet-1.1.4
+        (r'github.com/.+/(?:zip|tar)ball/.*-((\d+\.)+\d+)$', spec),
+
+        # e.g. https://github.com/isaacs/npm/tarball/v0.2.5-1
+        (r'github.com/.+/(?:zip|tar)ball/v?((\d+\.)+\d+-(\d+))$', spec),
+
+        # e.g. https://github.com/petdance/ack/tarball/1.93_02
+        (r'github.com/.+/(?:zip|tar)ball/v?((\d+\.)+\d+_(\d+))$', spec),
+
+        # e.g. https://github.com/erlang/otp/tarball/OTP_R15B01 (erlang style)
+        (r'[-_](R\d+[AB]\d*(-\d+)?)', spec),
+
+        # e.g. boost_1_39_0
+        (r'((\d+_)+\d+)$', stem, lambda s: s.replace('_', '.')),
+
+        # e.g. foobar-4.5.1-1
+        # e.g. ruby-1.9.1-p243
+        (r'-((\d+\.)*\d\.\d+-(p|rc|RC)?\d+)(?:[-._](?:bin|dist|stable|src|sources))?$', stem),
+
+        # e.g. lame-398-1
+        (r'-((\d)+-\d)', stem),
+
+        # e.g. foobar-4.5.1
+        (r'-((\d+\.)*\d+)$', stem),
+
+        # e.g. foobar-4.5.1b
+        (r'-((\d+\.)*\d+([a-z]|rc|RC)\d*)$', stem),
+
+        # e.g. foobar-4.5.0-beta1, or foobar-4.50-beta
+        (r'-((\d+\.)*\d+-beta(\d+)?)$', stem),
+
+        # e.g. foobar4.5.1
+        (r'((\d+\.)*\d+)$', stem),
+
+        # e.g. foobar-4.5.0-bin
+        (r'-((\d+\.)+\d+[a-z]?)[-._](bin|dist|stable|src|sources?)$', stem),
+
+        # e.g. dash_0.5.5.1.orig.tar.gz (Debian style)
+        (r'_((\d+\.)+\d+[a-z]?)[.]orig$', stem),
+
+        # e.g. http://www.openssl.org/source/openssl-0.9.8s.tar.gz
+        (r'-([^-]+)', stem),
+
+        # e.g. astyle_1.23_macosx.tar.gz
+        (r'_([^_]+)', stem),
+
+        # e.g. http://mirrors.jenkins-ci.org/war/1.486/jenkins.war
+        (r'\/(\d\.\d+)\/', spec),
+
+        # e.g. http://www.ijg.org/files/jpegsrc.v8d.tar.gz
+        (r'\.v(\d+[a-z]?)', stem)]
+
+    for type in version_types:
+        regex, match_string = type[:2]
+        match = re.search(regex, match_string)
+        if match and match.group(1) is not None:
+            if type[2:]:
+                return Version(type[2](match.group(1)))
+            else:
+                return Version(match.group(1))
+    return None