Moved files around into new project structure

1 files changed, 52 insertions, 0 deletions

diff --git a/gitautodeploy/lock.py b/gitautodeploy/lock.py
new file mode 100644
index 0000000..8bd8b32
--- /dev/null
+++ b/gitautodeploy/lock.py
@@ -0,0 +1,52 @@
+class Lock():
+    """Simple implementation of a mutex lock using the file systems. Works on
+    *nix systems."""
+
+    path = None
+    _has_lock = False
+
+    def __init__(self, path):
+        self.path = path
+
+    def obtain(self):
+        import os
+        import logging
+        logger = logging.getLogger()
+
+        try:
+            os.open(self.path, os.O_CREAT | os.O_EXCL | os.O_WRONLY)
+            self._has_lock = True
+            logger.info("Successfully obtained lock: %s" % self.path)
+        except OSError:
+            return False
+        else:
+            return True
+
+    def release(self):
+        import os
+        import logging
+        logger = logging.getLogger()
+
+        if not self._has_lock:
+            raise Exception("Unable to release lock that is owned by another process")
+        try:
+            os.remove(self.path)
+            logger.info("Successfully released lock: %s" % self.path)
+        finally:
+            self._has_lock = False
+
+    def has_lock(self):
+        return self._has_lock
+
+    def clear(self):
+        import os
+        import logging
+        logger = logging.getLogger()
+
+        try:
+            os.remove(self.path)
+        except OSError:
+            pass
+        finally:
+            logger.info("Successfully cleared lock: %s" % self.path)
+            self._has_lock = False
\ No newline at end of file