evolve: fixed lock acquire before checking state
Before checking the states `repo.lock()` and `repo.wlock()` need
to be acquired. This was not happening in `evolve()` earlier.
This patch creates a seperate `_performevolve()` funtion which
can be then called with locks acquired.
This also removes the redundant lock acuquiring of `abortevolve`
and `continueevolve` as lock is now taken earlier.
[flake8]
ignore =
#closing bracket does not match indentation of opening bracket's line
E123,
# closing bracket does not match visual indentation
E124,
# visually indented line with same indent as next logical line
E129,
# at least two spaces before inline comment
E261,
# too many leading '#' for block comment
E266,
# expected 2 blank lines, found 0
E302,
# expected 2 blank lines after end of function or class
E305,
# module level import not at top of file
E402,
# line too long (82 > 79 characters)
E501,
# do not assign a lambda expression, use a def
E731,
# class names should use CapWords convention
N801,
# line break occurred before a binary operator
W503
builtins=xrange, execfile