bug fixes

- Make prefix an actual string so that install doesn't fail.
- Executable should throw SpackError on command failure.

3 files changed, 35 insertions, 36 deletions

diff --git a/lib/spack/spack/util/executable.py b/lib/spack/spack/util/executable.py
index 58c70ed28c..4d5eff0bd8 100644
--- a/lib/spack/spack/util/executable.py
+++ b/lib/spack/spack/util/executable.py
@@ -26,7 +26,9 @@ import os
 import sys
 import re
 import subprocess
+
 import spack.tty as tty
+from spack.error import SpackError
 
 
 class Executable(object):
@@ -66,10 +68,13 @@ class Executable(object):
                 stderr=sys.stderr,
                 stdout=subprocess.PIPE if return_output else sys.stdout)
             out, err = proc.communicate()
+            if fail_on_error and proc.returncode != 0:
+                raise SpackError("command '%s' returned error code %d"
+                                 % (" ".join(cmd), proc.returncode))
             if return_output:
                 return out
 
-        except CalledProcessError, e:
+        except subprocess.CalledProcessError, e:
             if fail_on_error: raise
 
     def __repr__(self):
diff --git a/lib/spack/spack/util/prefix.py b/lib/spack/spack/util/prefix.py
index 50347a28f7..09a04676f7 100644
--- a/lib/spack/spack/util/prefix.py
+++ b/lib/spack/spack/util/prefix.py
@@ -27,7 +27,7 @@ This file contains utilities to help with installing packages.
 """
 from spack.util.filesystem import new_path
 
-class Prefix(object):
+class Prefix(str):
     """This class represents an installation prefix, but provides useful
        attributes for referring to directories inside the prefix.
 
@@ -48,7 +48,8 @@ class Prefix(object):
            /usr/share
            /usr/share/man/man4
 
-       In addition, Prefix objects can be added to strings, e.g.:
+       Prefix objects behave identically to strings.  In fact, they
+       subclass str.  So operators like + are legal:
 
            print "foobar " + prefix
 
@@ -56,36 +57,25 @@ class Prefix(object):
        installs easy.
     """
 
-    def __init__(self, prefix):
-        self.prefix = prefix
-        self.bin     = new_path(self.prefix, 'bin')
-        self.sbin    = new_path(self.prefix, 'sbin')
-        self.etc     = new_path(self.prefix, 'etc')
-        self.include = new_path(self.prefix, 'include')
-        self.lib     = new_path(self.prefix, 'lib')
-        self.lib64   = new_path(self.prefix, 'lib64')
-        self.libexec = new_path(self.prefix, 'libexec')
-        self.share   = new_path(self.prefix, 'share')
-        self.doc     = new_path(self.share, 'doc')
-        self.info    = new_path(self.share, 'info')
-        self.man     = new_path(self.share, 'man')
-        self.man1    = new_path(self.man, 'man1')
-        self.man2    = new_path(self.man, 'man2')
-        self.man3    = new_path(self.man, 'man3')
-        self.man4    = new_path(self.man, 'man4')
-        self.man5    = new_path(self.man, 'man5')
-        self.man6    = new_path(self.man, 'man6')
-        self.man7    = new_path(self.man, 'man7')
-        self.man8    = new_path(self.man, 'man8')
-
-
-    def __str__(self):
-        return self.prefix
-
-
-    def __add__(self, other):
-        return str(self) + other
-
-
-    def __radd__(self, other):
-        return other + str(self)
+    def __new__(cls, path):
+        s = super(Prefix, cls).__new__(cls, path)
+        s.bin     = new_path(s, 'bin')
+        s.sbin    = new_path(s, 'sbin')
+        s.etc     = new_path(s, 'etc')
+        s.include = new_path(s, 'include')
+        s.lib     = new_path(s, 'lib')
+        s.lib64   = new_path(s, 'lib64')
+        s.libexec = new_path(s, 'libexec')
+        s.share   = new_path(s, 'share')
+        s.doc     = new_path(s.share, 'doc')
+        s.info    = new_path(s.share, 'info')
+        s.man     = new_path(s.share, 'man')
+        s.man1    = new_path(s.man, 'man1')
+        s.man2    = new_path(s.man, 'man2')
+        s.man3    = new_path(s.man, 'man3')
+        s.man4    = new_path(s.man, 'man4')
+        s.man5    = new_path(s.man, 'man5')
+        s.man6    = new_path(s.man, 'man6')
+        s.man7    = new_path(s.man, 'man7')
+        s.man8    = new_path(s.man, 'man8')
+        return s
diff --git a/lib/spack/spack/util/web.py b/lib/spack/spack/util/web.py
index db021cc884..82e202aa8f 100644
--- a/lib/spack/spack/util/web.py
+++ b/lib/spack/spack/util/web.py
@@ -79,6 +79,10 @@ def _spider(args):
         req.get_method = lambda: "HEAD"
         resp = urllib2.urlopen(req, timeout=TIMEOUT)
 
+        if not "Content-type" in resp.headers:
+            print "ignoring page " + url
+            return pages
+
         if not resp.headers["Content-type"].startswith('text/html'):
             print "ignoring page " + url + " with content type " + resp.headers["Content-type"]
             return pages