spack checksum works.

lib/spack/spack/cmd/checksum.py

@@ -7,12 +7,13 @@
 
 import spack.tty as tty
 import spack.packages as packages
-from spack.stage import Stage
+import spack.util.crypto
+from spack.stage import Stage, FailedDownloadError
 from spack.colify import colify
-from spack.util.crypto import checksum
 from spack.version import *
 
-group='foo'
+default_number_to_fetch = 10
+
 description ="Checksum available versions of a package, print out checksums for addition to a package file."
 
 def setup_parser(subparser):
@@ -20,9 +21,6 @@ def setup_parser(subparser):
         'package', metavar='PACKAGE', help='Package to list versions for')
     subparser.add_argument(
         'versions', nargs=argparse.REMAINDER, help='Versions to generate checksums for')
-    subparser.add_argument(
-        '-n', '--number', dest='number', type=int,
-        default=10, help='Number of versions to list')
 
 
 def checksum(parser, args):
@@ -30,7 +28,6 @@ def checksum(parser, args):
     pkg = packages.get(args.package)
 
     # If the user asked for specific versions, use those.
-    # Otherwise get the latest n, where n is from the -n/--number param
     versions = [ver(v) for v in args.versions]
 
     if not all(type(v) == Version for v in versions):
@@ -38,23 +35,48 @@ def checksum(parser, args):
                 "version ranges.  Use unambiguous versions.")
 
     if not versions:
-        versions = pkg.fetch_available_versions()[:args.number]
+        versions = pkg.fetch_available_versions()
         if not versions:
             tty.die("Could not fetch any available versions for %s." % pkg.name)
 
-    versions.sort()
-    versions.reverse()
+    versions = list(reversed(versions))
     urls = [pkg.url_for_version(v) for v in versions]
 
-    tty.msg("Found %s versions to checksum." % len(urls))
-    tty.msg("Downloading...")
+    version_listings = ["%-10s%s" % (v,u) for v, u in zip(versions, urls)]
+    tty.msg("Found %s versions to checksum." % len(urls),
+            *version_listings)
 
+    print
+    while True:
+        ans = raw_input("How many would you like to checksum? (default 10, 0 to abort) ")
+        try:
+            if not ans:
+                to_download = default_number_to_fetch
+            else:
+                to_download = int(ans)
+            break
+        except ValueError:
+            tty.msg("Please enter a valid number.")
+            pass
+
+    if not to_download:
+        tty.msg("Aborted.")
+        return
+    else:
+        urls = urls[:to_download]
+
+    tty.msg("Downloading...")
     hashes = []
     for url, version in zip(urls, versions):
         stage = Stage(url)
         try:
             stage.fetch()
-            hashes.append(checksum(hashlib.md5, stage.archive_file))
+            hashes.append(spack.util.crypto.checksum(
+                hashlib.md5, stage.archive_file))
+        except FailedDownloadError, e:
+            tty.msg("Failed to fetch %s" % url)
+            continue
+
         finally:
             stage.destroy()
 

lib/spack/spack/util/executable.py

@@ -1,4 +1,5 @@
 import os
+import sys
 import re
 import subprocess
 import spack.tty as tty
@@ -26,20 +27,26 @@ def __call__(self, *args, **kwargs):
 
         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.",
+            tty.warn("Quotes in command arguments can confuse 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")
+                     "Quotes aren't needed because spack doesn't use a shell.",
+                     "Consider removing them")
 
         cmd = self.exe + list(args)
         tty.verbose(" ".join(cmd))
 
-        if return_output:
-            return subprocess.check_output(cmd)
-        elif fail_on_error:
-            return subprocess.check_call(cmd)
-        else:
-            return subprocess.call(cmd)
+        try:
+            proc = subprocess.Popen(
+                cmd,
+                stderr=sys.stderr,
+                stdout=subprocess.PIPE if return_output else sys.stdout)
+            out, err = proc.communicate()
+            if return_output:
+                return out
+
+        except CalledProcessError, e:
+            if fail_on_error: raise
 
     def __repr__(self):
         return "<exe: %s>" % self.exe

lib/spack/spack/version.py

@@ -144,8 +144,7 @@ def a_or_n(seg):
 
 
     def __iter__(self):
-        for v in self.version:
-            yield v
+        return iter(self.version)
 
 
     def __getitem__(self, idx):
@@ -486,8 +485,11 @@ def __getitem__(self, index):
 
 
     def __iter__(self):
-        for v in self.versions:
-            yield v
+        return iter(self.versions)
+
+
+    def __reversed__(self):
+        return reversed(self.versions)
 
 
     def __len__(self):