Merge branch 'master' of https://github.com/ddelange/pipgrip into fixes

* 'master' of https://github.com/ddelange/pipgrip:
  ➕ Add backports for enum and typing modules (#7)
  💚 Upgrade GitHub actions/checkout@v1 --> v2 (#5)

.github/workflows/main.yml

@@ -1,6 +1,6 @@
 name: GH
 
-on: [push]
+on: [push, pull_request]
 
 jobs:
   CI:
@@ -10,7 +10,7 @@ jobs:
       matrix:
         python-version: [2.7, 3.5, 3.6, 3.7, 3.8]
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v2
 
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v1
@@ -48,7 +48,7 @@ jobs:
     if: startsWith(github.ref, 'refs/tags/')
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v2
 
     - name: Set up Python 3.8
       uses: actions/setup-python@v1

requirements/prod.txt

@@ -4,3 +4,5 @@ packaging>=17
 pkginfo>=1.4.2
 setuptools>=38.3  # for pkg_resources
 wheel
+enum34; python_version=='2.7'
+typing; python_version=='2.7'

src/pipgrip/pipper.py

@@ -123,7 +123,7 @@ def _download_wheel(package, index_url, extra_index_url, pre, cache_dir):
         raise
     out = out.decode("utf-8").splitlines()[::-1]
     for i, line in enumerate(out):
-        if cache_dir in line or abs_cache_dir in line:
+        if cache_dir in line or abs_cache_dir in line or "ephem-wheel-cache" in line:
             if line.strip().startswith("Stored in directory"):
                 # wheel was built
                 fname = [