Add facility to delete artifacts

In order to allow the artifact cache to be cleaned up, this patch allows for a
/delete method which can remove artifacts from the cache.  It takes the
following arguments:

    artifact=artifactname

The artifact will be deleted and a JSON object returned in the form:

{
    "status": errno,
    "reason": strerror
}

Where errno is zero on success, 1 on EPERM, 2 on ENOENT etc. and reason is the
strerror of the errno, in case the architectures differ between caller and
cache.

1 files changed, 13 insertions, 0 deletions

diff --git a/morph-cache-server b/morph-cache-server
index 286e56db..b4f8fa1a 100755
--- a/morph-cache-server
+++ b/morph-cache-server
@@ -137,6 +137,19 @@ class MorphCacheServer(cliapp.Application):
                 response.status = 500
                 logging.debug('%s' % e)
 
+        @writable('/delete')
+        def delete():
+            artifact = self._unescape_parameter(request.query.artifact)
+            try:
+                os.unlink('%s/%s' % (self.settings['artifact-dir'],
+                                     artifact))
+                return { "status": 0, "reason": "success" }
+            except OSError, ose:
+                return { "status": ose.errno, "reason": ose.strerror }
+            except Exception, e:
+                response.status = 500
+                logging.debug('%s' % e)
+
         @app.get('/sha1s')
         def sha1():
             repo = self._unescape_parameter(request.query.repo)