fix GBprocesS easyconfig by switching to source tarball created using git_config (#15048)

* fix GBprocesS easyconfig by switching to source tarball created using git_config

* clarify why git_config is needed for GBprocesS

Author: boegel

easybuild/easyconfigs/g/GBprocesS/GBprocesS-2.3-intel-2020a-Python-3.8.2.eb

@@ -1,6 +1,7 @@
 easyblock = 'PythonPackage'
 
 name = 'GBprocesS'
+local_commit = '82e21929'
 version = '2.3'
 versionsuffix = '-Python-%(pyver)s'
 
@@ -14,9 +15,18 @@ used."""
 
 toolchain = {'name': 'intel', 'version': '2020a'}
 
-source_urls = ['https://gitlab.com/dschaumont/GBprocesS/-/archive/%(version)s/']
-sources = ['GBprocesS-%(version)s.tar.gz']
-checksums = ['374fa7bc096e0cbc83746f505bea134117debed99b7510cb4123878aeaea9456']
+# need to use git_config rather than just downloading source tarball,
+# because .git subdirectory is required by setuptools-scm to determine version
+sources = [{
+    'filename': 'GBprocesS-%%(version)s-%s.tar.gz' % local_commit,
+    'git_config': {
+        'url': 'https://gitlab.com/dschaumont',
+        'repo_name': name,
+        'commit': local_commit,
+        'keep_git_dir': True,
+    },
+}]
+checksums = [None]
 
 dependencies = [
     ('Python', '3.8.2'),
@@ -29,17 +39,8 @@ use_pip = True
 sanity_pip_check = True
 download_dep_fail = True
 
-# The package uses setuptools-scm, so we avoid using the "version" part of it.
-pretestopts = (
-    "sed -i 's/"
-    "__version__ = get_distribution(__name__).version/"
-    "__version__ = \"%(version)s\"/g' gbprocess/__init__.py && "
-    "sed -i \"s|use_scm_version={'write_to': 'gbprocess/version.py'}|version='%(version)s'|g\" setup.py && "
-)
-
-runtest = 'python -m unittest discover -v -s ./test -p test_*.py'
-
 sanity_check_commands = [
+    "cd %(builddir)s/GBprocesS && python -m unittest discover -v -s ./test -p test_*.py",
     "touch %(builddir)s/17146FL-13-01-01_S97_L002_R1_001.fastq",
     "touch %(builddir)s/17146FL-13-01-01_S97_L002_R2_001.fastq",
     # Trivial configuration file to use when running gbprocess sanity check