# HG changeset patch
# User Siddharth Agarwal <sid0@fb.com>
# Date 2015-09-25 19:28:12
# Node ID b50f5beadf3ee8f9e3339595cc4d3ec055666069
# Parent  024644b1900bf05692e9631ea9bcdddba592e05e

localrepo: allow creating inherited locks

This is part of a series that will allow locks to be inherited by subprocesses
in limited circumstances.

diff --git a/mercurial/localrepo.py b/mercurial/localrepo.py
--- a/mercurial/localrepo.py
+++ b/mercurial/localrepo.py
@@ -1211,10 +1211,15 @@ class localrepository(object):
                 continue
             ce.refresh()
 
-    def _lock(self, vfs, lockname, wait, releasefn, acquirefn, desc):
+    def _lock(self, vfs, lockname, wait, releasefn, acquirefn, desc,
+              parentenvvar=None):
+        parentlock = None
+        if parentenvvar is not None:
+            parentlock = os.environ.get(parentenvvar)
         try:
             l = lockmod.lock(vfs, lockname, 0, releasefn=releasefn,
-                             acquirefn=acquirefn, desc=desc)
+                             acquirefn=acquirefn, desc=desc,
+                             parentlock=parentlock)
         except error.LockHeld as inst:
             if not wait:
                 raise