Rename `FormulaLock` to `LockFile`.

1 files changed, 49 insertions, 0 deletions

diff --git a/Library/Homebrew/lock_file.rb b/Library/Homebrew/lock_file.rb
new file mode 100644
index 000000000..83743b744
--- /dev/null
+++ b/Library/Homebrew/lock_file.rb
@@ -0,0 +1,49 @@
+require "fcntl"
+
+class LockFile
+  def initialize(name)
+    @name = name
+    @path = HOMEBREW_LOCK_DIR/"#{@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 unless @lockfile.nil? || @lockfile.closed?
+    @lockfile = @path.open(File::RDWR | File::CREAT)
+    @lockfile.fcntl(Fcntl::F_SETFD, Fcntl::FD_CLOEXEC)
+  end
+end
+
+class FormulaLock < LockFile
+  def initialize(name)
+    super("#{name}.formula")
+  end
+end
+
+class CaskLock < LockFile
+  def initialize(name)
+    super("#{name}.cask")
+  end
+end