Add new -l flag to set checkpoint location for /contrib/pg_resetxlog.

diff --git a/contrib/pg_resetxlog/README.pg_resetxlog b/contrib/pg_resetxlog/README.pg_resetxlog
index 943b2a1b0c1337b68540e8b4ec23e0a526647042..8a7b11904503ace389210d987abadad16b47c48b 100644 (file)
--- a/contrib/pg_resetxlog/README.pg_resetxlog
+++ b/contrib/pg_resetxlog/README.pg_resetxlog
@@ -22,7 +22,7 @@ Then run pg_resetxlog, and finally install and start the new version of
 the database software.
 
 A tertiary purpose it its use by pg_upgrade to set the next transaction
-id in pg_control.
+id and checkpoint location in pg_control.
 
 To run the program, make sure your postmaster is not running, then
 (as the Postgres admin user) do

diff --git a/contrib/pg_resetxlog/pg_resetxlog.c b/contrib/pg_resetxlog/pg_resetxlog.c
index 7957c957e3806861705978f3182b7d911315e518..89b3ed6fdb7c631bdd90ee4d94315ee471432c63 100644 (file)
--- a/contrib/pg_resetxlog/pg_resetxlog.c
+++ b/contrib/pg_resetxlog/pg_resetxlog.c
@@ -23,7 +23,7 @@
  * Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $Header: /cvsroot/pgsql/contrib/pg_resetxlog/Attic/pg_resetxlog.c,v 1.12 2002/01/10 18:08:29 momjian Exp $
+ * $Header: /cvsroot/pgsql/contrib/pg_resetxlog/Attic/pg_resetxlog.c,v 1.13 2002/01/10 20:09:06 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -683,6 +683,7 @@ PrintControlValues(void)
                   "Catalog version number:               %u\n"
                   "Current log file id:                  %u\n"
                   "Next log file segment:                %u\n"
+                  "Latest checkpoint location:           %X/%X\n"
                   "Latest checkpoint's StartUpID:        %u\n"
                   "Latest checkpoint's NextXID:          %u\n"
                   "Latest checkpoint's NextOID:          %u\n"
@@ -695,6 +696,8 @@ PrintControlValues(void)
                   ControlFile.catalog_version_no,
                   ControlFile.logId,
                   ControlFile.logSeg,
+                  ControlFile.checkPoint.xlogid,
+                  ControlFile.checkPoint.xrecoff,
                   ControlFile.checkPointCopy.ThisStartUpID,
                   ControlFile.checkPointCopy.nextXid,
                   ControlFile.checkPointCopy.nextOid,
@@ -709,7 +712,7 @@ PrintControlValues(void)
  * Write out the new pg_control file.
  */
 static void
-RewriteControlFile(TransactionId set_xid)
+RewriteControlFile(TransactionId set_xid, XLogRecPtr set_checkpoint)
 {
        int                     fd;
        char            buffer[BLCKSZ]; /* need not be aligned */
@@ -733,13 +736,18 @@ RewriteControlFile(TransactionId set_xid)
        ControlFile.time = time(NULL);
        ControlFile.logId = newXlogId;
        ControlFile.logSeg = newXlogSeg + 1;
-       ControlFile.checkPoint = ControlFile.checkPointCopy.redo;
        ControlFile.prevCheckPoint.xlogid = 0;
        ControlFile.prevCheckPoint.xrecoff = 0;
 
        if (set_xid != 0)
                ControlFile.checkPointCopy.nextXid = set_xid;
-       
+
+       if (set_checkpoint.xlogid == 0 &&
+               set_checkpoint.xrecoff == 0)
+               ControlFile.checkPoint = ControlFile.checkPointCopy.redo;
+       else
+               ControlFile.checkPoint = set_checkpoint;
+
        /* Contents are protected with a CRC */
        INIT_CRC64(ControlFile.crc);
        COMP_CRC64(ControlFile.crc,
@@ -929,10 +937,11 @@ WriteEmptyXLOG(void)
 static void
 usage(void)
 {
-       fprintf(stderr, "Usage: pg_resetxlog [-f] [-n] [-x xid] PGDataDirectory\n"
-                       " -f\tforce update to be done\n"
-                       " -n\tno update, just show extracted pg_control values (for testing)\n"
-                       " -x XID\tset XID in pg_control\n");
+       fprintf(stderr, "Usage: pg_resetxlog [-f] [-n] [-x xid] [ -l log_id offset ] PGDataDirectory\n"
+                       "  -f\t  force update to be done\n"
+                       "  -n\t  no update, just show extracted pg_control values (for testing)\n"
+                       "  -x XID  set XID in pg_control\n"
+                       "  -l log_id offset   set checkpoint location in pg_control\n");
        exit(1);
 }
 
@@ -944,6 +953,7 @@ main(int argc, char **argv)
        bool            force = false;
        bool            noupdate = false;
        TransactionId set_xid = 0;
+       XLogRecPtr      set_checkpoint = {0,0};
        int                     fd;
        char            path[MAXPGPATH];
 
@@ -967,6 +977,23 @@ main(int argc, char **argv)
                                exit(1);
                        }
                }
+               else if (strcmp(argv[argn], "-l") == 0)
+               {
+                       argn++;
+                       if (argn == argc)
+                               usage();
+                       set_checkpoint.xlogid = strtoul(argv[argn], NULL, 0);
+                       argn++;
+                       if (argn == argc)
+                               usage();
+                       set_checkpoint.xrecoff = strtoul(argv[argn], NULL, 0);
+                       if (set_checkpoint.xlogid == 0 &&
+                               set_checkpoint.xrecoff == 0)
+                       {
+                               fprintf(stderr, "Checkpoint can not be '0 0'.");
+                               exit(1);
+                       }
+               }
                else
                        usage();
        }
@@ -1035,7 +1062,7 @@ main(int argc, char **argv)
        /*
         * Else, do the dirty deed.
         */
-       RewriteControlFile(set_xid);
+       RewriteControlFile(set_xid, set_checkpoint);
        KillExistingXLOG();
        WriteEmptyXLOG();