# HG changeset patch
# User Pierre-Yves David <pierre-yves.david@octobus.net>
# Date 1536859359 -7200
# Node ID 1c0a09668709d3aa8a0993406a216e2320954ab3
# Parent  3895f6fcd35c177246d0a49294687422fa9cba8c
stablesortcache: ignore permission and OS errors when writing

This cache is related to the obshashrange one and we update it lazily by
default.

This can be an issue when pulling locally from a read only repository that was
not configured for a more aggressive cache warming. The raised permission error
was uncaught and could crash the whole process. Errors during cache update
should not block Mercurial operations.

diff -r 3895f6fcd35c -r 1c0a09668709 hgext3rd/evolve/stablesort.py
--- a/hgext3rd/evolve/stablesort.py	Thu Sep 13 19:09:48 2018 +0200
+++ b/hgext3rd/evolve/stablesort.py	Thu Sep 13 19:22:39 2018 +0200
@@ -634,21 +634,24 @@
         """
         if self._cachekey is None or self._cachekey == self._ondiskkey:
             return
-        cachevfs = compat.getcachevfs(repo)
-        cachefile = cachevfs(self._filepath, 'w', atomictemp=True)
+        try:
+            cachevfs = compat.getcachevfs(repo)
+            cachefile = cachevfs(self._filepath, 'w', atomictemp=True)
 
-        # data to write
-        headerdata = self._serializecachekey()
-        indexdata = self._index.tostring()
-        data = self._data.tostring()
-        indexsize = S_INDEXSIZE.pack(len(indexdata))
+            # data to write
+            headerdata = self._serializecachekey()
+            indexdata = self._index.tostring()
+            data = self._data.tostring()
+            indexsize = S_INDEXSIZE.pack(len(indexdata))
 
-        # writing
-        cachefile.write(headerdata)
-        cachefile.write(indexsize)
-        cachefile.write(indexdata)
-        cachefile.write(data)
-        cachefile.close()
+            # writing
+            cachefile.write(headerdata)
+            cachefile.write(indexsize)
+            cachefile.write(indexdata)
+            cachefile.write(data)
+            cachefile.close()
+        except (IOError, OSError) as exc:
+            repo.ui.debug('stablesortcache: could not write update %s\n' % exc)
 
 @eh.reposetup
 def setupcache(ui, repo):