Blob Blame History Raw
diff --git a/pip/utils/outdated.py b/pip/utils/outdated.py
index 2164cc3..c71539f 100644
--- a/pip/utils/outdated.py
+++ b/pip/utils/outdated.py
@@ -92,6 +92,21 @@ def load_selfcheck_statefile():
         return GlobalSelfCheckState()
 
 
+def pip_installed_by_pip():
+    """Checks whether pip was installed by pip
+
+    This is used not to display the upgrade message when pip is in fact
+    installed by system package manager, such as dnf on Fedora.
+    """
+    import pkg_resources
+    try:
+        dist = pkg_resources.get_distribution('pip')
+        return (dist.has_metadata('INSTALLER') and
+                'pip' in dist.get_metadata_lines('INSTALLER'))
+    except pkg_resources.DistributionNotFound:
+        return False
+
+
 def pip_version_check(session):
     """Check for an update for pip.
 
@@ -141,7 +156,8 @@ def pip_version_check(session):
 
         # Determine if our pypi_version is older
         if (pip_version < remote_version and
-                pip_version.base_version != remote_version.base_version):
+                pip_version.base_version != remote_version.base_version and
+                pip_installed_by_pip()):
             # Advise "python -m pip" on Windows to avoid issues
             # with overwriting pip.exe.
             if WINDOWS: