80 lines
3.2 KiB
Plaintext
80 lines
3.2 KiB
Plaintext
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#!/usr/bin/env python3
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import os
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import sys
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import logging
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from subprocess import check_call, check_output, call, run
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from pyroute2 import netns
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logging.basicConfig(stream=sys.stdout, level=logging.DEBUG)
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if __name__ == '__main__':
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# Work around the lack of modified LD_LIBRARY_PATH and PATH variables with
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# snap-specific content.
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snap_dir = os.environ['SNAP']
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snap_libs = (f'{snap_dir}/lib:{snap_dir}/usr/lib:'
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f'{snap_dir}/lib/x86_64-linux-gnu:'
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f'{snap_dir}/usr/lib/x86_64-linux-gnu')
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os.environ['LD_LIBRARY_PATH'] = snap_libs
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check_call(['snapctl', 'start', 'microstack.ovsdb-server'])
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check_call(['snapctl', 'start', 'microstack.ovs-vswitchd'])
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logging.info('Attempting to remove br-ex.')
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check_call(['ovs-vsctl', '--if-exists', 'del-br', 'br-ex'])
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check_call(['snapctl', 'stop', 'microstack.ovsdb-server'])
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check_call(['snapctl', 'stop', 'microstack.ovs-vswitchd'])
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for ns in netns.listnetns():
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if ns.startswith('ovnmeta-'):
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logging.info(f'Removing the {ns} network namespace.')
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netns.remove(ns)
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# Need to expose targets prior to starting iscsid in order to properly log out
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# of iSCSI sessions.
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check_call(['snapctl', 'start', 'microstack.target'])
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check_call(['snapctl', 'start', 'microstack.iscsid'])
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check_call(['sync'])
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# Assuming the QEMU processes have already been killed by snapd,
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# log out of all targets prior to removing the snap to clean up
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# the kernel state.
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# TODO: be more selective about logging out since there may be sessions
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# unrelated to MicroStack in the kernel.
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# TODO: also clean up block devices by writing to
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# /sys/class/block/<dev>/device/delete since those do not get deleted on
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# session logout.
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logging.info('Attempting to remove iscsi sessions from the kernel.')
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res = run(['iscsiadm', '-m', 'node', '-u'])
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# ISCSI_ERR_NO_OBJS_FOUND
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if res.returncode == 21:
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logging.debug('No iscsi sessions were found.')
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elif res.returncode == 0:
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logging.debug('Successfully logged the existing iscsi sessions out.')
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else:
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# Albeit this is an error condition we cannot do much in the remove
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# hook to fix this besides logging since snapd does not stop the
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# snap removal on error in the remove hook.
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logging.error('Unexpected error code received from iscsiadm: '
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f'{res.returncode}')
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check_call(['snapctl', 'stop', 'microstack.iscsid'])
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check_call(['snapctl', 'stop', 'microstack.target'])
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# File-backed LVM resource cleanup (if present).
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loop_file = f'{os.environ["SNAP_COMMON"]}/cinder-lvm.img'
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allocated_loop_dev = check_output(
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f'losetup -j {loop_file} | cut -d ":" -f 1', shell=True
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).decode('utf-8').strip()
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if allocated_loop_dev:
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cinder_lvm_vg = check_output([
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'snapctl', 'get', 'config.cinder.lvm-backend-volume-group']
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).strip()
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if not call(['vgdisplay', cinder_lvm_vg]):
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check_call(['vgremove', '-f', cinder_lvm_vg])
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if not call(['pvdisplay', allocated_loop_dev]):
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check_call(['pvremove', '-f', allocated_loop_dev])
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check_call(['losetup', '-d', allocated_loop_dev])
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