From: Zac Medico <zmedico@gentoo.org>
Date: Sun, 8 May 2011 05:02:38 +0000 (-0700)
Subject: linkmap: check for access before locking vardbapi
X-Git-Tag: v2.2.0_alpha32~11
X-Git-Url: http://git.tremily.us/gitweb.cgi?a=commitdiff_plain;h=6d916753c07ccad4fcc596b155d776f297aeeb68;p=portage.git

linkmap: check for access before locking vardbapi
---

diff --git a/pym/portage/util/_dyn_libs/LinkageMapELF.py b/pym/portage/util/_dyn_libs/LinkageMapELF.py
index 31aacbbf2..11e32b6b9 100644
--- a/pym/portage/util/_dyn_libs/LinkageMapELF.py
+++ b/pym/portage/util/_dyn_libs/LinkageMapELF.py
@@ -183,7 +183,9 @@ class LinkageMapELF(object):
 				lines.append((include_file, line))
 
 		aux_keys = [self._needed_aux_key]
-		self._dbapi.lock()
+		can_lock = os.access(os.path.dirname(self._dbapi._dbroot), os.W_OK)
+		if can_lock:
+			self._dbapi.lock()
 		try:
 			for cpv in self._dbapi.cpv_all():
 				if exclude_pkgs is not None and cpv in exclude_pkgs:
@@ -193,7 +195,8 @@ class LinkageMapELF(object):
 				for line in self._dbapi.aux_get(cpv, aux_keys)[0].splitlines():
 					lines.append((needed_file, line))
 		finally:
-			self._dbapi.unlock()
+			if can_lock:
+				self._dbapi.unlock()
 
 		# have to call scanelf for preserved libs here as they aren't 
 		# registered in NEEDED.ELF.2 files