From c99663211379389f416c5ba50a759555e2b1f9ec Mon Sep 17 00:00:00 2001
From: Todd Gamblin <tgamblin@llnl.gov>
Date: Wed, 29 Jun 2016 01:41:55 -0700
Subject: Add spack purge --cache to purge local archive cache.

---
 .gitignore                        |  1 +
 lib/spack/spack/cmd/purge.py      | 26 ++++++++++++++++++++++++--
 lib/spack/spack/fetch_strategy.py |  7 +++++--
 3 files changed, 30 insertions(+), 4 deletions(-)

diff --git a/.gitignore b/.gitignore
index 643e5d9b03..040df3eafd 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,5 @@
 /var/spack/stage
+/var/spack/cache
 *.pyc
 /opt/
 *~
diff --git a/lib/spack/spack/cmd/purge.py b/lib/spack/spack/cmd/purge.py
index 7b33ef7f69..f4e27a3969 100644
--- a/lib/spack/spack/cmd/purge.py
+++ b/lib/spack/spack/cmd/purge.py
@@ -22,9 +22,31 @@
 # License along with this program; if not, write to the Free Software
 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 ##############################################################################
+import spack
 import spack.stage as stage
 
-description = "Remove all temporary build files and downloaded archives"
+description = "Remove temporary build files and/or downloaded archives"
+
+
+def setup_parser(subparser):
+    subparser.add_argument(
+        '-s', '--stage', action='store_true', default=True,
+        help="Remove all temporary build stages (default).")
+    subparser.add_argument(
+        '-c', '--cache', action='store_true', help="Remove cached downloads.")
+    subparser.add_argument(
+        '-a', '--all', action='store_true',
+        help="Remove all of the above.")
+
 
 def purge(parser, args):
-    stage.purge()
+    # Special case: no flags.
+    if not any((args.stage, args.cache, args.all)):
+        stage.purge()
+        return
+
+    # handle other flags with fall through.
+    if args.stage or args.all:
+        stage.purge()
+    if args.cache or args.all:
+        spack.cache.destroy()
diff --git a/lib/spack/spack/fetch_strategy.py b/lib/spack/spack/fetch_strategy.py
index 6f28ec34b2..69c04f7920 100644
--- a/lib/spack/spack/fetch_strategy.py
+++ b/lib/spack/spack/fetch_strategy.py
@@ -361,7 +361,7 @@ class CacheURLFetchStrategy(URLFetchStrategy):
     """The resource associated with a cache URL may be out of date."""
     def __init__(self, *args, **kwargs):
         super(CacheURLFetchStrategy, self).__init__(*args, **kwargs)
-    
+
     @_needs_stage
     def fetch(self):
         super(CacheURLFetchStrategy, self).fetch()
@@ -853,11 +853,14 @@ class FsCache(object):
         dst = join_path(self.root, relativeDst)
         mkdirp(os.path.dirname(dst))
         fetcher.archive(dst)
-        
+
     def fetcher(self, targetPath, digest):
         url = "file://" + join_path(self.root, targetPath)
         return CacheURLFetchStrategy(url, digest)
 
+    def destroy(self):
+        shutil.rmtree(self.root, ignore_errors=True)
+
 
 class FetchError(spack.error.SpackError):
 
-- 
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