71 lines
1.2 KiB
Ruby
71 lines
1.2 KiB
Ruby
# typed: true
|
|
# frozen_string_literal: true
|
|
|
|
require "fcntl"
|
|
|
|
# A lock file.
|
|
#
|
|
# @api private
|
|
class LockFile
|
|
attr_reader :path
|
|
|
|
def initialize(name)
|
|
@name = name.to_s
|
|
@path = HOMEBREW_LOCKS/"#{@name}.lock"
|
|
@lockfile = nil
|
|
end
|
|
|
|
def lock
|
|
@path.parent.mkpath
|
|
create_lockfile
|
|
return if @lockfile.flock(File::LOCK_EX | File::LOCK_NB)
|
|
|
|
raise OperationInProgressError, @name
|
|
end
|
|
|
|
def unlock
|
|
return if @lockfile.nil? || @lockfile.closed?
|
|
|
|
@lockfile.flock(File::LOCK_UN)
|
|
@lockfile.close
|
|
end
|
|
|
|
def with_lock
|
|
lock
|
|
yield
|
|
ensure
|
|
unlock
|
|
end
|
|
|
|
private
|
|
|
|
def create_lockfile
|
|
return if @lockfile.present? && !@lockfile.closed?
|
|
|
|
begin
|
|
@lockfile = @path.open(File::RDWR | File::CREAT)
|
|
rescue Errno::EMFILE
|
|
odie "The maximum number of open files on this system has been reached. Use `ulimit -n` to increase this limit."
|
|
end
|
|
@lockfile.fcntl(Fcntl::F_SETFD, Fcntl::FD_CLOEXEC)
|
|
end
|
|
end
|
|
|
|
# A lock file for a formula.
|
|
#
|
|
# @api private
|
|
class FormulaLock < LockFile
|
|
def initialize(name)
|
|
super("#{name}.formula")
|
|
end
|
|
end
|
|
|
|
# A lock file for a cask.
|
|
#
|
|
# @api private
|
|
class CaskLock < LockFile
|
|
def initialize(name)
|
|
super("#{name}.cask")
|
|
end
|
|
end
|