Ensure that all startup paths (postmaster, standalone postgres, or

bootstrap) check for a valid PG_VERSION file before looking at anything
else in the data directory.  This fixes confusing error report when
trying to start current sources in a pre-7.1 data directory.
Per trouble report from Rich Shepard 10/18/01.

src/backend/bootstrap/bootstrap.c

@@ -8,7 +8,7 @@
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/bootstrap/bootstrap.c,v 1.117 2001/09/29 04:02:22 tgl Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/bootstrap/bootstrap.c,v 1.118 2001/10/19 17:03:08 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -303,11 +303,13 @@ BootstrapMain(int argc, char *argv[])
 		}
 		SetDataDir(potential_DataDir);
 	}
+
+	/* Validate we have been given a reasonable-looking DataDir */
 	Assert(DataDir);
+	ValidatePgVersion(DataDir);
 
 	if (IsUnderPostmaster)
 	{
-
 		/*
 		 * Properly accept or ignore signals the postmaster might send us
 		 */

src/backend/postmaster/postmaster.c

@@ -37,7 +37,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/postmaster/postmaster.c,v 1.246 2001/10/19 00:44:08 tgl Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/postmaster/postmaster.c,v 1.247 2001/10/19 17:03:08 tgl Exp $
  *
  * NOTES
  *
@@ -287,6 +287,9 @@ checkDataDir(const char *checkdir)
 		ExitPostmaster(2);
 	}
 
+	/* Look for PG_VERSION before looking for pg_control */
+	ValidatePgVersion(checkdir);
+
 	snprintf(path, sizeof(path), "%s/global/pg_control", checkdir);
 
 	fp = AllocateFile(path, PG_BINARY_R);
@@ -299,10 +302,7 @@ checkDataDir(const char *checkdir)
 				progname, checkdir, path, strerror(errno));
 		ExitPostmaster(2);
 	}
-
 	FreeFile(fp);
-
-	ValidatePgVersion(checkdir);
 }
 
 
@@ -2438,10 +2438,10 @@ SSDataBase(int xlop)
 
 		av[ac++] = "-d";
 
-		sprintf(nbbuf, "-B%u", NBuffers);
+		sprintf(nbbuf, "-B%d", NBuffers);
 		av[ac++] = nbbuf;
 
-		sprintf(xlbuf, "-x %d", xlop);
+		sprintf(xlbuf, "-x%d", xlop);
 		av[ac++] = xlbuf;
 
 		av[ac++] = "-p";

src/backend/tcop/postgres.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/tcop/postgres.c,v 1.235 2001/10/19 00:44:08 tgl Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/tcop/postgres.c,v 1.236 2001/10/19 17:03:08 tgl Exp $
  *
  * NOTES
  *	  this is the "main" module of the postgres backend and
@@ -1583,6 +1583,12 @@ PostgresMain(int argc, char *argv[],
 			proc_exit(1);
 		}
 
+		/*
+		 * Validate we have been given a reasonable-looking DataDir
+		 * (if under postmaster, assume postmaster did this already).
+		 */
+		ValidatePgVersion(DataDir);
+
 		/*
 		 * Create lockfile for data directory.
 		 */
@@ -1645,7 +1651,7 @@ PostgresMain(int argc, char *argv[],
 	if (!IsUnderPostmaster)
 	{
 		puts("\nPOSTGRES backend interactive interface ");
-		puts("$Revision: 1.235 $ $Date: 2001/10/19 00:44:08 $\n");
+		puts("$Revision: 1.236 $ $Date: 2001/10/19 17:03:08 $\n");
 	}
 
 	/*

src/backend/utils/init/miscinit.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/utils/init/miscinit.c,v 1.78 2001/10/12 02:08:34 ishii Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/utils/init/miscinit.c,v 1.79 2001/10/19 17:03:08 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -912,10 +912,8 @@ ValidatePgVersion(const char *path)
 	}
 
 	ret = fscanf(file, "%ld.%ld", &file_major, &file_minor);
-	if (ret == EOF)
-		elog(FATAL, "cannot read %s: %m", full_path);
-	else if (ret != 2)
-		elog(FATAL, "`%s' does not have a valid format. You need to initdb.", full_path);
+	if (ret != 2)
+		elog(FATAL, "File %s does not contain valid data. You need to initdb.", full_path);
 
 	FreeFile(file);
 

src/backend/utils/init/postinit.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/utils/init/postinit.c,v 1.93 2001/09/29 04:02:25 tgl Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/utils/init/postinit.c,v 1.94 2001/10/19 17:03:08 tgl Exp $
  *
  *
  *-------------------------------------------------------------------------
@@ -221,13 +221,7 @@ InitPostgres(const char *dbname, const char *username)
 		char	   *fullpath,
 					datpath[MAXPGPATH];
 
-		/* Verify if DataDir is ok */
-		if (access(DataDir, F_OK) == -1)
-			elog(FATAL, "Database system not found.\n\t"
-				 "Data directory '%s' does not exist.",
-				 DataDir);
-
-		ValidatePgVersion(DataDir);
+		/* Formerly we validated DataDir here, but now that's done earlier. */
 
 		/*
 		 * Find oid and path of the database we're about to open. Since