diff --git a/ddtrace/sourcecode/_utils.py b/ddtrace/sourcecode/_utils.py
index 8397327664c..f41a9f7cce2 100644
--- a/ddtrace/sourcecode/_utils.py
+++ b/ddtrace/sourcecode/_utils.py
@@ -1,5 +1,5 @@
+import os
 import re
-import subprocess
 from urllib import parse
 
 
@@ -56,15 +56,23 @@ def normalize_repository_url(url):
 
 
 def _query_git(args):
+    import subprocess  # don't import subprocess (and maybe activate the integration) if not needed
+
     ver = subprocess.Popen(["git"] + args, stdout=subprocess.PIPE).communicate()[0]
     return ver.strip().decode("utf-8")
 
 
 def get_commit_sha():
+    commit_sha = os.environ.get("DD_GIT_COMMIT_SHA")
+    if commit_sha:
+        return commit_sha
     return _query_git(["rev-parse", "HEAD"])
 
 
 def get_repository_url():
+    repository_url = os.environ.get("DD_GIT_REPOSITORY_URL")
+    if repository_url:
+        return repository_url
     return _query_git(["config", "--get", "remote.origin.url"])
 
 
diff --git a/releasenotes/notes/sourcecode-check-env-vars-cab3d9b6311c2695.yaml b/releasenotes/notes/sourcecode-check-env-vars-cab3d9b6311c2695.yaml
new file mode 100644
index 00000000000..9f96e3dae8a
--- /dev/null
+++ b/releasenotes/notes/sourcecode-check-env-vars-cab3d9b6311c2695.yaml
@@ -0,0 +1,5 @@
+---
+fixes:
+  - |
+    source code integration: check that ``DD_GIT_COMMIT_SHA`` and ``DD_GIT_REPOSITORY_URL`` are defined before
+    using the git command.
diff --git a/tests/sourcecode/test_source_code_env_vars.py b/tests/sourcecode/test_source_code_env_vars.py
new file mode 100644
index 00000000000..92c4683700a
--- /dev/null
+++ b/tests/sourcecode/test_source_code_env_vars.py
@@ -0,0 +1,55 @@
+import os
+from unittest import mock
+
+from ddtrace.sourcecode._utils import get_commit_sha
+from ddtrace.sourcecode._utils import get_repository_url
+
+
+class TestSourceCodeEnvVars:
+    def test_get_commit_sha_uses_env_var_when_present(self):
+        test_sha = "abc123def456"
+        with mock.patch.dict(os.environ, {"DD_GIT_COMMIT_SHA": test_sha}):
+            with mock.patch("ddtrace.sourcecode._utils._query_git") as mock_git:
+                result = get_commit_sha()
+                assert result == test_sha
+                mock_git.assert_not_called()
+
+    def test_get_commit_sha_calls_git_when_env_var_not_present(self):
+        test_sha = "git_result_sha"
+        with mock.patch.dict(os.environ, {}, clear=True):
+            with mock.patch("ddtrace.sourcecode._utils._query_git", return_value=test_sha) as mock_git:
+                result = get_commit_sha()
+                assert result == test_sha
+                mock_git.assert_called_once_with(["rev-parse", "HEAD"])
+
+    def test_get_commit_sha_calls_git_when_env_var_empty(self):
+        test_sha = "git_result_sha"
+        with mock.patch.dict(os.environ, {"DD_GIT_COMMIT_SHA": ""}):
+            with mock.patch("ddtrace.sourcecode._utils._query_git", return_value=test_sha) as mock_git:
+                result = get_commit_sha()
+                assert result == test_sha
+                mock_git.assert_called_once_with(["rev-parse", "HEAD"])
+
+    def test_get_repository_url_uses_env_var_when_present(self):
+        test_url = "https://github.com/user/repo.git"
+        with mock.patch.dict(os.environ, {"DD_GIT_REPOSITORY_URL": test_url}):
+            with mock.patch("ddtrace.sourcecode._utils._query_git") as mock_git:
+                result = get_repository_url()
+                assert result == test_url
+                mock_git.assert_not_called()
+
+    def test_get_repository_url_calls_git_when_env_var_not_present(self):
+        test_url = "git_result_url"
+        with mock.patch.dict(os.environ, {}, clear=True):
+            with mock.patch("ddtrace.sourcecode._utils._query_git", return_value=test_url) as mock_git:
+                result = get_repository_url()
+                assert result == test_url
+                mock_git.assert_called_once_with(["config", "--get", "remote.origin.url"])
+
+    def test_get_repository_url_calls_git_when_env_var_empty(self):
+        test_url = "git_result_url"
+        with mock.patch.dict(os.environ, {"DD_GIT_REPOSITORY_URL": ""}):
+            with mock.patch("ddtrace.sourcecode._utils._query_git", return_value=test_url) as mock_git:
+                result = get_repository_url()
+                assert result == test_url
+                mock_git.assert_called_once_with(["config", "--get", "remote.origin.url"])