diff options
Diffstat (limited to 'src/backend/utils/init/miscinit.c')
| -rw-r--r-- | src/backend/utils/init/miscinit.c | 51 |
1 files changed, 50 insertions, 1 deletions
diff --git a/src/backend/utils/init/miscinit.c b/src/backend/utils/init/miscinit.c index eaee59d81fe..2b63ace0eca 100644 --- a/src/backend/utils/init/miscinit.c +++ b/src/backend/utils/init/miscinit.c @@ -8,7 +8,7 @@ * * * IDENTIFICATION - * $Header: /cvsroot/pgsql/src/backend/utils/init/miscinit.c,v 1.50 2000/06/14 18:17:46 petere Exp $ + * $Header: /cvsroot/pgsql/src/backend/utils/init/miscinit.c,v 1.51 2000/07/02 15:20:56 petere Exp $ * *------------------------------------------------------------------------- */ @@ -24,6 +24,7 @@ #include <grp.h> #include <pwd.h> #include <stdlib.h> +#include <errno.h> #include "catalog/catname.h" #include "catalog/pg_shadow.h" @@ -520,3 +521,51 @@ SetPidFile(pid_t pid) return (0); } + + + +/* + * Determine whether the PG_VERSION file in directory `path' indicates + * a data version compatible with the version of this program. + * + * If compatible, return. Otherwise, elog(FATAL). + */ +void +ValidatePgVersion(const char *path) +{ + char full_path[MAXPGPATH]; + FILE *file; + int ret; + long file_major, file_minor; + long my_major = 0, my_minor = 0; + char *endptr; + const char *version_string = PG_VERSION; + + my_major = strtol(version_string, &endptr, 10); + if (*endptr == '.') + my_minor = strtol(endptr+1, NULL, 10); + + snprintf(full_path, MAXPGPATH, "%s/PG_VERSION", path); + + file = AllocateFile(full_path, "r"); + if (!file) + { + if (errno == ENOENT) + elog(FATAL, "File %s is missing. This is not a valid data directory.", full_path); + else + elog(FATAL, "cannot open %s: %s", full_path, strerror(errno)); + } + + ret = fscanf(file, "%ld.%ld", &file_major, &file_minor); + if (ret == EOF) + elog(FATAL, "cannot read %s: %s", full_path, strerror(errno)); + else if (ret != 2) + elog(FATAL, "`%s' does not have a valid format. You need to initdb.", full_path); + + FreeFile(file); + + if (my_major != file_major || my_minor != file_minor) + elog(FATAL, "The data directory was initalized by PostgreSQL version %ld.%ld, " + "which is not compatible with this verion %s.", + file_major, file_minor, version_string); +} |