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diff --git a/pip/utils/outdated.py b/pip/utils/outdated.py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--- a/pip/utils/outdated.py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+++ b/pip/utils/outdated.py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