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Fix fetching for Python 3.9.6 (#24686)

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When using Python 3.9.6, Spack is no longer able to fetch anything. Commands like `spack fetch` and `spack install` all break.

Python 3.9.6 includes a [new change](https://github.com/python/cpython/pull/25853/files#diff-b3712475a413ec972134c0260c8f1eb1deefb66184f740ef00c37b4487ef873eR462) that means that `scheme` must be a string, it cannot be None. The solution is to use an empty string like the method default.

Fixes #24644. Also see https://github.com/Homebrew/homebrew-core/pull/80175 where this issue was discovered by CI. Thanks @branchvincent for reporting such a serious issue before any actual users encountered it!

Co-authored-by: Todd Gamblin <tgamblin@llnl.gov>
This commit is contained in:
Adam J. Stewart 2021-07-03 00:20:09 -05:00 committed by GitHub
parent e568564e2f
commit 3b94e22ad4
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1 changed files with 6 additions and 6 deletions
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12
lib/spack/spack/util/url.py
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@ -11,8 +11,8 @@
import os.path
import re
from six import string_types
import six.moves.urllib.parse as urllib_parse
from six import string_types
import spack.util.path
@ -151,21 +151,21 @@ def join(base_url, path, *extra, **kwargs):
for x in itertools.chain((base_url, path), extra)]
n = len(paths)
last_abs_component = None
scheme = None
scheme = ''
for i in range(n - 1, -1, -1):
obj = urllib_parse.urlparse(
paths[i], scheme=None, allow_fragments=False)
paths[i], scheme='', allow_fragments=False)
scheme = obj.scheme
# in either case the component is absolute
if scheme is not None or obj.path.startswith('/'):
if scheme is None:
if scheme or obj.path.startswith('/'):
if not scheme:
# Without a scheme, we have to go back looking for the
# next-last component that specifies a scheme.
for j in range(i - 1, -1, -1):
obj = urllib_parse.urlparse(
paths[j], scheme=None, allow_fragments=False)
paths[j], scheme='', allow_fragments=False)
if obj.scheme:
paths[i] = '{SM}://{NL}{PATH}'.format(