diff --git a/pip/utils/outdated.py b/pip/utils/outdated.py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--- a/pip/utils/outdated.py
+++ b/pip/utils/outdated.py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: