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# frozen_string_literal: true
require_relative 'file'
module FakeFS
# Be careful using this, as it may break things if
# you obtain more that one flock per file using
# different descriptors.
# Real flock call blocks/returns false in that case -
# see https://man7.org/linux/man-pages/man2/flock.2.html,
# it says it "may be denied", but it does, it fact, deny.
# This implementation simply returns 0.
# This may also be a problem if you, it fact, are accessing a
# real file, which is locked by another process.
class File < StringIO
# yep, File::LOCK_UN | File::LOCK_NB is allowed
FAKE_FS_ALLOWED_FLOCK_MODES = [RealFile::LOCK_EX, RealFile::LOCK_SH, RealFile::LOCK_UN].flat_map do |mode|
[mode, mode | RealFile::LOCK_NB]
end.freeze
remove_method :flock
def flock(mode)
# all successful calls - even UN - seem to return 0
unless mode.is_a?(Integer)
unless mode.respond_to?(:to_int)
raise TypeError, "no implicit conversion of #{mode.class} into Integer"
end
int_mode = mode.to_int
unless int_mode.is_a?(Integer)
raise TypeError, "can't convert #{mode.class} to Integer (#{mode.class}#to_int gives #{int_mode.class})"
end
mode = int_mode
end
# In fact, real implementation may not fail on `flock 11111` -
# - but fails with `f1.flock 11111111` - or may fail
# with another error - `f1.flock 1111111111111` gives
# `integer 1111111111111 too big to convert to `int' (RangeError)`
# - but I think it's safer to allow only documented modes.
unless FAKE_FS_ALLOWED_FLOCK_MODES.include?(mode)
# real exception
# Invalid argument @ rb_file_flock - filepath (Errno::EINVAL)
# raise Errno::EINVAL.new(@path, 'rb_file_flock')
# represents it better, but fails on JRuby
raise Errno::EINVAL, @path
end
0
end
end
end
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