fix yaml loading versions as floating point and losing trailing zeros

conda_build/metadata.py

@@ -1,6 +1,7 @@
 from __future__ import absolute_import, division, print_function
 
 from collections import OrderedDict
+import contextlib
 import copy
 import hashlib
 import json
@@ -32,6 +33,13 @@
     sys.exit('Error: could not import yaml (required to read meta.yaml '
              'files of conda recipes)')
 
+try:
+    loader = yaml.CLoader
+except:
+    loader = yaml.Loader
+
+from yaml.resolver import Resolver
+
 on_win = (sys.platform == 'win32')
 
 # arches that don't follow exact names in the subdir need to be mapped here
@@ -202,7 +210,9 @@ def select_lines(data, namespace, variants_in_place):
 
 def yamlize(data):
     try:
-        return yaml.load(data)
+        with stringify_numbers():
+            loaded_data = yaml.load(data, Loader=loader)
+        return loaded_data
     except yaml.error.YAMLError as e:
         if '{{' in data:
             try:
@@ -786,6 +796,18 @@ def trim_build_only_deps(metadata, requirements_used):
     return requirements_used - to_remove
 
 
+@contextlib.contextmanager
+def stringify_numbers():
+    # ensure that numbers are not interpreted as ints or floats.  That trips up versions
+    #     with trailing zeros.
+    implicit_resolver_backup = Resolver.yaml_implicit_resolvers.copy()
+    for ch in list(u'-+0123456789'):
+        del Resolver.yaml_implicit_resolvers[ch]
+    yield
+    for ch in list(u'-+0123456789'):
+        Resolver.yaml_implicit_resolvers[ch] = implicit_resolver_backup[ch]
+
+
 class MetaData(object):
     def __init__(self, path, config=None, variant=None):
 

tests/test-recipes/metadata/float_misinterpretation/meta.yaml

@@ -0,0 +1,5 @@
+# test ensuring that version numbers that look like floating point numbers are kept as strings
+
+package:
+  name: test_floating_point_version
+  version: 1.10

tests/test-recipes/metadata/float_misinterpretation/run_test.bat

@@ -0,0 +1,4 @@
+if not "%PKG_VERSION%" == "1.10" (
+   echo PKG_VERSION is %PKG_VERSION%; should be 1.10
+   exit 1
+)

tests/test-recipes/metadata/float_misinterpretation/run_test.sh

@@ -0,0 +1,4 @@
+if [ "$PKG_VERSION" != "1.10" ]; then
+    echo "PKG_VERSION is $PKG_VERSION, but should be 1.10"
+    exit 1
+ fi