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require 'puppet/util'
module Puppet::Util::FileLocking
module_function
# Create a shared lock for reading
def readlock(file)
Puppet::Util.sync(file).synchronize(Sync::SH) do
File.open(file) { |f|
f.lock_shared { |lf| yield lf }
}
end
end
# Create an exclusive lock for writing, and do the writing in a
# tmp file.
def writelock(file, mode = nil)
unless FileTest.directory?(File.dirname(file))
raise Puppet::DevError, "Cannot create %s; directory %s does not exist" % [file, File.dirname(file)]
end
tmpfile = file + ".tmp"
unless mode
# It's far more likely that the file will be there than not, so it's
# better to stat once to check for existence and mode.
# If we can't stat, it's most likely because the file's not there,
# but could also be because the directory isn't readable, in which case
# we won't be able to write anyway.
begin
mode = File.stat(file).mode
rescue
mode = 0600
end
end
Puppet::Util.sync(file).synchronize(Sync::EX) do
File.open(file, "w", mode) do |rf|
rf.lock_exclusive do |lrf|
yield lrf
end
end
end
end
end
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