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qmp-shell: add persistent command history 

Use the existing readline history function we are utilizing
to provide persistent command history across instances of qmp-shell.

This assists entering debug commands across sessions that may be
interrupted by QEMU sessions terminating, where the qmp-shell has
to be relaunched.

Signed-off-by: John Snow <jsnow@redhat.com>
Message-Id: <20170427223628.20893-1-jsnow@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Kashyap Chamarthy <kchamart@redhat.com>
Tested-by: Kashyap Chamarthy <kchamart@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
This commit is contained in:
John Snow 2017-04-27 18:36:28 -04:00 committed by Markus Armbruster
parent 8b2e41d733
commit aa3b167f21
1 changed files with 21 additions and 0 deletions
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21
scripts/qmp/qmp-shell
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@ -70,6 +70,9 @@ import json
import ast
import readline
import sys
import os
import errno
import atexit
class QMPCompleter(list):
def complete(self, text, state):
@ -109,6 +112,8 @@ class QMPShell(qmp.QEMUMonitorProtocol):
self._pretty = pretty
self._transmode = False
self._actions = list()
self._histfile = os.path.join(os.path.expanduser('~'),
'.qmp-shell_history')
def __get_address(self, arg):
"""
@ -132,11 +137,27 @@ class QMPShell(qmp.QEMUMonitorProtocol):
def __completer_setup(self):
self._completer = QMPCompleter()
self._fill_completion()
readline.set_history_length(1024)
readline.set_completer(self._completer.complete)
readline.parse_and_bind("tab: complete")
# XXX: default delimiters conflict with some command names (eg. query-),
# clearing everything as it doesn't seem to matter
readline.set_completer_delims('')
try:
readline.read_history_file(self._histfile)
except Exception as e:
if isinstance(e, IOError) and e.errno == errno.ENOENT:
# File not found. No problem.
pass
else:
print "Failed to read history '%s'; %s" % (self._histfile, e)
atexit.register(self.__save_history)
def __save_history(self):
try:
readline.write_history_file(self._histfile)
except Exception as e:
print "Failed to save history file '%s'; %s" % (self._histfile, e)
def __parse_value(self, val):
try: