transaction: apply checkambig=True only on limited files for similarity
Now, transaction can determine whether avoidance of file stat
ambiguity is needed for each files, by blacklist "checkambigfiles".
For similarity to truncation in _playback(), this patch apply
checkambig=True only on limited files in code paths below.
- restoring files by util.copyfile(), in _playback()
(checkambigfiles itself is examined at first, because it as a
keyword argument might be None)
- writing files at finalization of transaction, in _generatefiles()
This patch reduces cost of checking stat at writing out and restoring
files, which aren't filecache-ed.
--- a/mercurial/transaction.py Tue Jul 04 23:13:46 2017 +0900
+++ b/mercurial/transaction.py Tue Jul 04 23:13:47 2017 +0900
@@ -72,8 +72,9 @@
if f and b:
filepath = vfs.join(f)
backuppath = vfs.join(b)
+ checkambig = checkambigfiles and (f, l) in checkambigfiles
try:
- util.copyfile(backuppath, filepath, checkambig=True)
+ util.copyfile(backuppath, filepath, checkambig=checkambig)
backupfiles.append(b)
except IOError:
report(_("failed to recover %s\n") % f)
@@ -328,10 +329,12 @@
name += suffix
if suffix:
self.registertmp(name, location=location)
+ checkambig = False
else:
self.addbackup(name, location=location)
+ checkambig = (name, location) in self.checkambigfiles
files.append(vfs(name, 'w', atomictemp=True,
- checkambig=not suffix))
+ checkambig=checkambig))
genfunc(*files)
finally:
for f in files: