added configuration option to define the env command to use for shebangs

easybuild/framework/easyblock.py

@@ -2367,7 +2367,7 @@ def fix_shebang(self):
                 if isinstance(fix_shebang_for, string_type):
                     fix_shebang_for = [fix_shebang_for]
 
-                shebang = '#!/usr/bin/env %s' % lang
+                shebang = '#!%s %s' % (build_option('env_for_shebang'), lang)
                 for glob_pattern in fix_shebang_for:
                     paths = glob.glob(os.path.join(self.installdir, glob_pattern))
                     self.log.info("Fixing '%s' shebang to '%s' for files that match '%s': %s",

easybuild/tools/config.py

@@ -79,6 +79,7 @@
 DEFAULT_CONT_TYPE = CONT_TYPE_SINGULARITY
 
 DEFAULT_BRANCH = 'develop'
+DEFAULT_ENV_FOR_SHEBANG = '/usr/bin/env'
 DEFAULT_ENVVAR_USERS_MODULES = 'HOME'
 DEFAULT_INDEX_MAX_AGE = 7 * 24 * 60 * 60  # 1 week (in seconds)
 DEFAULT_JOB_BACKEND = 'GC3Pie'
@@ -295,6 +296,9 @@ def mk_full_default_path(name, prefix=DEFAULT_PREFIX):
     DEFAULT_BRANCH: [
         'pr_target_branch',
     ],
+    DEFAULT_ENV_FOR_SHEBANG: [
+        'env_for_shebang',
+    ],
     DEFAULT_INDEX_MAX_AGE: [
         'index_max_age',
     ],

easybuild/tools/options.py

@@ -375,6 +375,7 @@ def override_options(self):
                           None, 'store', None, 'e', {'metavar': 'CLASS'}),
             'enforce-checksums': ("Enforce availability of checksums for all sources/patches, so they can be verified",
                                   None, 'store_true', False),
+            'env-for-shebang': ("Define the env command to use when fixing shebangs", None, 'store', '/usr/bin/env'),
             'experimental': ("Allow experimental code (with behaviour that can be changed/removed at any given time).",
                              None, 'store_true', False),
             'extra-modules': ("List of extra modules to load after setting up the build environment",

test/framework/toy_build.py

@@ -40,7 +40,7 @@
 import sys
 import tempfile
 from distutils.version import LooseVersion
-from test.framework.utilities import EnhancedTestCase, TestLoaderFiltered
+from test.framework.utilities import EnhancedTestCase, TestLoaderFiltered, init_config
 from test.framework.package import mock_fpm
 from unittest import TextTestRunner
 
@@ -2854,6 +2854,46 @@ def test_fix_shebang(self):
             self.assertTrue(bash_shebang_regex.match(bashbin_txt),
                             "Pattern '%s' found in %s: %s" % (bash_shebang_regex.pattern, bashbin_path, bashbin_txt))
 
+        # now test with a custom env command
+        init_config(build_options={'env_for_shebang': "/usr/bin/env -S"})
+
+        self.test_toy_build(ec_file=test_ec, raise_error=True)
+
+        toy_bindir = os.path.join(self.test_installpath, 'software', 'toy', '0.0', 'bin')
+
+        # bin/toy and bin/toy2 should *not* be patched, since they're binary files
+        toy_txt = read_file(os.path.join(toy_bindir, 'toy'), mode='rb')
+        for fn in ['toy.perl', 'toy.python']:
+            fn_txt = read_file(os.path.join(toy_bindir, fn), mode='rb')
+            # no shebang added
+            self.assertFalse(fn_txt.startswith(b"#!/"))
+            # exact same file as original binary (untouched)
+            self.assertEqual(toy_txt, fn_txt)
+
+        # no re.M, this should match at start of file!
+        py_shebang_regex = re.compile(r'^#!/usr/bin/env -S python\n# test$')
+        for pybin in ['t1.py', 't2.py', 't3.py', 't4.py', 't5.py', 't6.py', 't7.py']:
+            pybin_path = os.path.join(toy_bindir, pybin)
+            pybin_txt = read_file(pybin_path)
+            self.assertTrue(py_shebang_regex.match(pybin_txt),
+                            "Pattern '%s' found in %s: %s" % (py_shebang_regex.pattern, pybin_path, pybin_txt))
+
+        # no re.M, this should match at start of file!
+        perl_shebang_regex = re.compile(r'^#!/usr/bin/env -S perl\n# test$')
+        for perlbin in ['t1.pl', 't2.pl', 't3.pl', 't4.pl', 't5.pl', 't6.pl', 't7.pl']:
+            perlbin_path = os.path.join(toy_bindir, perlbin)
+            perlbin_txt = read_file(perlbin_path)
+            self.assertTrue(perl_shebang_regex.match(perlbin_txt),
+                            "Pattern '%s' found in %s: %s" % (perl_shebang_regex.pattern, perlbin_path, perlbin_txt))
+
+        # There are 2 bash files which shouldn't be influenced by fix_shebang
+        bash_shebang_regex = re.compile(r'^#!/usr/bin/env bash\n# test$')
+        for bashbin in ['b1.sh', 'b2.sh']:
+            bashbin_path = os.path.join(toy_bindir, bashbin)
+            bashbin_txt = read_file(bashbin_path)
+            self.assertTrue(bash_shebang_regex.match(bashbin_txt),
+                            "Pattern '%s' found in %s: %s" % (bash_shebang_regex.pattern, bashbin_path, bashbin_txt))
+
     def test_toy_system_toolchain_alias(self):
         """Test use of 'system' toolchain alias."""
         toy_ec = os.path.join(os.path.dirname(__file__), 'easyconfigs', 'test_ecs', 't', 'toy', 'toy-0.0.eb')