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https://github.com/libguestfs/libguestfs.git
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255882a3f6
'del g' is a trap for the unwary. If the handle has any other references, it does nothing (in fact, it can be actively dangerous if the user was expecting the appliance to go away). In non-CPython it can be delayed arbitrarily long. Using 'g.close()' on the other hand is always safe.
59 lines
1.8 KiB
Python
59 lines
1.8 KiB
Python
# libguestfs Python bindings
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# Copyright (C) 2011 Red Hat Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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import os
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import guestfs
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g = guestfs.GuestFS()
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def log_callback (ev,eh,buf,array):
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if ev == guestfs.EVENT_APPLIANCE:
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buf = buf.rstrip()
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# Log what happened.
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print ("python event logged: event=0x%x eh=%d buf='%s' array=%s" %
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(ev, eh, buf, array))
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close_invoked = 0
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def close_callback (ev, eh, buf, array):
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global close_invoked
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close_invoked += 1
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log_callback (ev, eh, buf, array)
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# Register an event callback for all log messages.
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events = guestfs.EVENT_APPLIANCE | guestfs.EVENT_LIBRARY | guestfs.EVENT_TRACE
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g.set_event_callback (log_callback, events)
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# Register a callback for the close event.
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g.set_event_callback (close_callback, guestfs.EVENT_CLOSE)
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# Now make sure we see some messages.
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g.set_trace (1)
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g.set_verbose (1)
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# Do some stuff.
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g.add_drive_ro ("/dev/null")
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g.set_autosync (1)
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# Close the handle. The close callback should be invoked.
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if close_invoked != 0:
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raise "Error: close_invoked should be 0"
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g.close ()
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if close_invoked != 1:
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raise "Error: close_invoked should be 1"
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