From: Daira Hopwood <daira@jacaranda.org>
Date: Wed, 30 Sep 2015 15:29:05 +0000 (+0100)
Subject: Cleanups relating to order of mtime and ctime.
X-Git-Url: https://git.rkrishnan.org/about.html?a=commitdiff_plain;h=71fe974462d1a0c3af15b1e8c118f5a00dcc2736;p=tahoe-lafs%2Ftahoe-lafs.git

Cleanups relating to order of mtime and ctime.

Signed-off-by: Daira Hopwood <daira@jacaranda.org>
---

diff --git a/src/allmydata/backupdb.py b/src/allmydata/backupdb.py
index ba348c32..1113d9ec 100644
--- a/src/allmydata/backupdb.py
+++ b/src/allmydata/backupdb.py
@@ -21,7 +21,8 @@ CREATE TABLE version
 CREATE TABLE local_files
 (
  path  VARCHAR(1024) PRIMARY KEY, -- index, this is an absolute UTF-8-encoded local filename
- size  INTEGER,       -- os.stat(fn)[stat.ST_SIZE]
+ -- note that size is before mtime and ctime here, but after in function parameters
+ size  INTEGER,       -- os.stat(fn)[stat.ST_SIZE]   (NULL if the file has been deleted)
  mtime NUMBER,        -- os.stat(fn)[stat.ST_MTIME]
  ctime NUMBER,        -- os.stat(fn)[stat.ST_CTIME]
  fileid INTEGER%s
@@ -186,9 +187,9 @@ class BackupDB:
         is not healthy, please upload the file and call r.did_upload(filecap)
         when you're done.
 
-        If use_timestamps=True (the default), I will compare ctime and mtime
+        If use_timestamps=True (the default), I will compare mtime and ctime
         of the local file against an entry in my database, and consider the
-        file to be unchanged if ctime, mtime, and filesize are all the same
+        file to be unchanged if mtime, ctime, and filesize are all the same
         as the earlier version. If use_timestamps=False, I will not trust the
         timestamps, so more files (perhaps all) will be marked as needing
         upload. A future version of this database may hash the file to make
@@ -200,10 +201,12 @@ class BackupDB:
         """
 
         path = abspath_expanduser_unicode(path)
+
+        # XXX consider using get_pathinfo
         s = os.stat(path)
         size = s[stat.ST_SIZE]
-        ctime = s[stat.ST_CTIME]
         mtime = s[stat.ST_MTIME]
+        ctime = s[stat.ST_CTIME]
 
         now = time.time()
         c = self.cursor
@@ -416,9 +419,9 @@ class MagicFolderDB(BackupDB):
         self.connection.commit()
 
     def is_new_file_time(self, path, relpath_u):
-        """is_new_file_time returns true if the file is recent...
-        meaning its current statinfo (i.e. size, ctime, and mtime) matched the statinfo
-        that was previously stored in the db.
+        """
+        Returns true if the file's current pathinfo (size, mtime, and ctime) has
+        changed from the pathinfo previously stored in the db.
         """
         path = abspath_expanduser_unicode(path)
         s = os.stat(path)
diff --git a/src/allmydata/util/fileutil.py b/src/allmydata/util/fileutil.py
index 4c3ea0a6..d1e3d616 100644
--- a/src/allmydata/util/fileutil.py
+++ b/src/allmydata/util/fileutil.py
@@ -629,7 +629,7 @@ else:
         except EnvironmentError:
             reraise(ConflictError)
 
-PathInfo = namedtuple('PathInfo', 'isdir isfile islink exists size ctime mtime')
+PathInfo = namedtuple('PathInfo', 'isdir isfile islink exists size mtime ctime')
 
 def get_pathinfo(path_u):
     try:
@@ -640,8 +640,8 @@ def get_pathinfo(path_u):
                         islink=stat.S_ISLNK(mode),
                         exists=True,
                         size  =statinfo.st_size,
-                        ctime =statinfo.st_ctime,
                         mtime =statinfo.st_mtime,
+                        ctime =statinfo.st_ctime,
                        )
     except OSError as e:
         if e.errno == ENOENT:
@@ -650,7 +650,7 @@ def get_pathinfo(path_u):
                             islink=False,
                             exists=False,
                             size  =None,
-                            ctime =None,
                             mtime =None,
+                            ctime =None,
                            )
         raise