From: David Stainton <dstainton415@gmail.com>
Date: Tue, 14 Jul 2015 23:34:27 +0000 (-0700)
Subject: Make backupdb schema evolution more visible
X-Git-Url: https://git.rkrishnan.org/pf/content/en/using.html?a=commitdiff_plain;h=0a602e0f272246e91b39d92b06b93a3befaef185;p=tahoe-lafs%2Ftahoe-lafs.git

Make backupdb schema evolution more visible
---

diff --git a/src/allmydata/backupdb.py b/src/allmydata/backupdb.py
index 14e6f9f0..b24c217e 100644
--- a/src/allmydata/backupdb.py
+++ b/src/allmydata/backupdb.py
@@ -12,28 +12,28 @@ from allmydata.util.dbutil import get_db, DBError
 DAY = 24*60*60
 MONTH = 30*DAY
 
-SCHEMA_v1 = """
-CREATE TABLE version -- added in v1
+MAIN_SCHEMA = """
+CREATE TABLE version
 (
- version INTEGER  -- contains one row, set to 2
+ version INTEGER  -- contains one row, set to %s
 );
 
-CREATE TABLE local_files -- added in v1
+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]
  mtime NUMBER,        -- os.stat(fn)[stat.ST_MTIME]
  ctime NUMBER,        -- os.stat(fn)[stat.ST_CTIME]
- fileid INTEGER
+ fileid INTEGER,%s
 );
 
-CREATE TABLE caps -- added in v1
+CREATE TABLE caps
 (
  fileid INTEGER PRIMARY KEY AUTOINCREMENT,
  filecap VARCHAR(256) UNIQUE       -- URI:CHK:...
 );
 
-CREATE TABLE last_upload -- added in v1
+CREATE TABLE last_upload
 (
  fileid INTEGER PRIMARY KEY,
  last_uploaded TIMESTAMP,
@@ -42,6 +42,8 @@ CREATE TABLE last_upload -- added in v1
 
 """
 
+SCHEMA_v1 = MAIN_SCHEMA % (1, "")
+
 TABLE_DIRECTORY = """
 
 CREATE TABLE directories -- added in v2
@@ -54,7 +56,7 @@ CREATE TABLE directories -- added in v2
 
 """
 
-SCHEMA_v2 = SCHEMA_v1 + TABLE_DIRECTORY
+SCHEMA_v2 = MAIN_SCHEMA % (2, "") + TABLE_DIRECTORY
 
 UPDATE_v1_to_v2 = TABLE_DIRECTORY + """
 UPDATE version SET version=2;
@@ -64,38 +66,8 @@ UPDATERS = {
     2: UPDATE_v1_to_v2,
 }
 
-MAIN_v3 = """
-CREATE TABLE version
-(
- version INTEGER  -- contains one row, set to 3
-);
-
-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]
- mtime NUMBER,        -- os.stat(fn)[stat.ST_MTIME]
- ctime NUMBER,        -- os.stat(fn)[stat.ST_CTIME]
- fileid INTEGER,
- version INTEGER
-);
-
-CREATE TABLE caps
-(
- fileid INTEGER PRIMARY KEY AUTOINCREMENT,
- filecap VARCHAR(256) UNIQUE       -- URI:CHK:...
-);
-
-CREATE TABLE last_upload
-(
- fileid INTEGER PRIMARY KEY,
- last_uploaded TIMESTAMP,
- last_checked TIMESTAMP
-);
-
-"""
 
-SCHEMA_v3 = MAIN_v3 + TABLE_DIRECTORY
+SCHEMA_v3 = MAIN_SCHEMA % (3, "\nversion INTEGER\n") + TABLE_DIRECTORY
 
 
 def get_backupdb(dbfile, stderr=sys.stderr,