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Today when ifupdown2 execute addons scripts we use the global environment dictionary (os.environ) and not a copy of this dict. This corrupts the environment. May 10 08:07:02 kvmformation1 networking[375279]: debug: vmbr101: pre-up : running script /etc/network/if-pre-up.d/openvswitch {'LANG': 'en_US.UTF-8', 'ADDRFAM': '', 'IFACE': 'vmbr101', 'JOURNAL_STREAM': '9:29498964', 'SHLVL': '1', 'LOGICAL': 'vmbr101', 'PWD': '/', 'MODE': 'start', '**IF_TESTVARIABLE2**': 'test', 'PHASE': 'pre-up', 'PATH': '/sbin:/bin', 'METHOD': '', '_': '/sbin/ifreload', 'INVOCATION_ID': '5ffcea837bc64759bd0c171b70e22cc2'} May 10 08:07:02 kvmformation1 networking[375279]: debug: vmbr100: pre-up : running script /etc/network/if-pre-up.d/openvswitch {'LANG': 'en_US.UTF-8', 'ADDRFAM': '', '**IF_OVS_TYPE**': 'OVSBridge', 'IFACE': 'vmbr100', 'JOURNAL_STREAM': '9:29498964', 'SHLVL': '1', 'LOGICAL': 'vmbr100', 'PWD': '/', 'MODE': 'start', '**IF_TESTVARIABLE2**': 'test', 'PHASE': 'pre-up', 'PATH': '/sbin:/bin', 'METHOD': '', '_': '/sbin/ifreload', 'INVOCATION_ID': '5ffcea837bc64759bd0c171b70e22cc2'} May 10 08:07:02 kvmformation1 networking[375279]: debug: eno1: pre-up : running script /etc/network/if-pre-up.d/openvswitch {'LANG': 'en_US.UTF-8', 'ADDRFAM': '', '**IF_OVS_TYPE**': 'OVSBridge', 'IFACE': 'eno1', 'JOURNAL_STREAM': '9:29498964', 'SHLVL': '1', 'LOGICAL': 'eno1', 'PWD': '/', 'MODE': 'start', '**IF_TESTVARIABLE2**': 'test', '**IF_TESTVARIABLE1**': 'test', 'PHASE': 'pre-up', 'PATH': '/sbin:/bin', 'METHOD': '', '_': '/sbin/ifreload', 'INVOCATION_ID': '5ffcea837bc64759bd0c171b70e22cc2'} May 10 08:07:02 kvmformation1 networking[375279]: debug: eno1.100: pre-up : running script /etc/network/if-pre-up.d/openvswitch {'LANG': 'en_US.UTF-8', 'ADDRFAM': '', '**IF_OVS_TYPE**': 'OVSBridge', 'IFACE': 'eno1.100', 'JOURNAL_STREAM': '9:29498964', 'SHLVL': '1', 'IF_NETMASK': '255.255.255.0', 'IF_ADDRESS': '10.59.100.231', 'LOGICAL': 'eno1.100', 'IF_GATEWAY': '10.59.100.1', 'PWD': '/', 'MODE': 'start', '**IF_TESTVARIABLE2**': 'test', 'IF_TESTVARIABLE1': 'test', 'PHASE': 'pre-up', 'PATH': '/sbin:/bin', 'METHOD': '', '_': '/sbin/ifreload', 'INVOCATION_ID': '5ffcea837bc64759bd0c171b70e22cc2'}