The routines in magic.c have moved to the more accessible version.c.
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Bryan Henderson
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/*-------------------------------------------------------------------------
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*
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* magic.c--
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* magic number management routines
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*
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* Copyright (c) 1994, Regents of the University of California
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/utils/init/Attic/magic.c,v 1.3 1996/11/06 10:31:56 scrappy Exp $
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*
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* NOTES
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* XXX eventually, should be able to handle version identifiers
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* of length != 4.
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*
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* STANDALONE CODE - do not use error routines as this code is linked with
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* stuff that does not cinterface.a
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*-------------------------------------------------------------------------
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*/
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#include <sys/file.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <ctype.h>
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#include <string.h>
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#include <stdio.h>
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#include <unistd.h>
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#include "postgres.h"
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#include "miscadmin.h" /* for global decls */
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#include "storage/fd.h" /* for O_ */
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static char Pg_verfile[] = PG_VERFILE;
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/*
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* private function prototypes
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*/
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static void PathSetVersionFilePath(const char *path, char *filepathbuf);
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/*
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* DatabaseMetaGunkIsConsistent
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*
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* Returns 1 iff all version numbers and ownerships are consistent.
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*
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* Note that we have to go through the whole rigmarole of generating the path
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* and checking the existence of the database whether Noversion is set or not.
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*/
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int
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DatabaseMetaGunkIsConsistent(const char *database, char *path)
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{
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int isValid;
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#ifndef WIN32
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struct stat statbuf;
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#else
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struct _stat statbuf;
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#endif
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/* XXX We haven't changed PG_VERSION since 1.1! */
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#ifndef WIN32
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isValid = ValidPgVersion(DataDir);
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sprintf(path, "%s/base/%s", DataDir, database);
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isValid = ValidPgVersion(path) || isValid;
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#endif /* WIN32 */
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if (stat(path, &statbuf) < 0)
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elog(FATAL, "database %s does not exist, bailing out...",
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database);
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return(isValid);
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}
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/*
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* ValidPgVersion - verifies the consistency of the database
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*
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* Returns 1 iff the catalog version number (from the version number file
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* in the directory specified in "path") is consistent with the backend
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* version number.
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*/
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int
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ValidPgVersion(const char *path)
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{
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int fd;
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char version[4], buf[MAXPGPATH+1];
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#ifndef WIN32
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struct stat statbuf;
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#else
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struct _stat statbuf;
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#endif
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u_short my_euid = geteuid();
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PathSetVersionFilePath(path, buf);
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if (stat(buf, &statbuf) >= 0) {
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if (statbuf.st_uid != my_euid && my_euid != 0)
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elog(FATAL,
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"process userid (%d) != database owner (%d)",
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my_euid, statbuf.st_uid);
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} else
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return(0);
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if ((fd = open(buf, O_RDONLY, 0)) < 0) {
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if (!Noversion)
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elog(DEBUG, "ValidPgVersion: %s: %m", buf);
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return(0);
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}
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if (read(fd, version, 4) < 4 ||
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!isascii(version[0]) || !isdigit(version[0]) ||
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version[1] != '.' ||
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!isascii(version[2]) || !isdigit(version[2]) ||
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version[3] != '\n')
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elog(FATAL, "ValidPgVersion: %s: bad format", buf);
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if (version[2] != '0' + PG_VERSION ||
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version[0] != '0' + PG_RELEASE) {
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if (!Noversion)
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elog(DEBUG,
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"ValidPgVersion: should be %d.%d not %c.%c",
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PG_RELEASE, PG_VERSION, version[0], version[2]);
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close(fd);
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return(0);
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}
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close(fd);
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return(1);
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}
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/*
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* SetPgVersion - writes the version to a database directory
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*/
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void
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SetPgVersion(const char *path)
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{
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int fd;
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char version[4], buf[MAXPGPATH+1];
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PathSetVersionFilePath(path, buf);
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if ((fd = open(buf, O_WRONLY|O_CREAT|O_EXCL, 0666)) < 0)
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elog(FATAL, "SetPgVersion: %s: %m", buf);
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version[0] = '0' + PG_RELEASE;
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version[1] = '.';
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version[2] = '0' + PG_VERSION;
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version[3] = '\n';
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if (write(fd, version, 4) != 4)
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elog(WARN, "SetPgVersion: %s: %m", buf);
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close(fd);
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}
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/*
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* PathSetVersionFilePath
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*
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* Destructively change "filepathbuf" to contain the concatenation of "path"
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* and the name of the version file name.
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*/
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static void
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PathSetVersionFilePath(const char *path, char *filepathbuf)
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{
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if (strlen(path) > (MAXPGPATH - sizeof(Pg_verfile) - 1))
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elog(FATAL, "PathSetVersionFilePath: %s: path too long");
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sprintf(filepathbuf, "%s%c%s", path, SEP_CHAR, Pg_verfile);
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}
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