In pg_upgrade, issue proper error message when we can't open PG_VERSION.

Backpatch to 9.2.

diff --git a/contrib/pg_upgrade/server.c b/contrib/pg_upgrade/server.c
index 11e7e75d78f8947478be0b092cf135a2a7783614..a9f9d85b787110aafc771a1e0cb29131037ddb17 100644 (file)
--- a/contrib/pg_upgrade/server.c
+++ b/contrib/pg_upgrade/server.c
@@ -149,7 +149,7 @@ get_major_server_version(ClusterInfo *cluster)
    snprintf(ver_filename, sizeof(ver_filename), "%s/PG_VERSION",
             cluster->pgdata);
    if ((version_fd = fopen(ver_filename, "r")) == NULL)
-       return 0;
+       pg_log(PG_FATAL, "could not open version file: %s\n", ver_filename);
 
    if (fscanf(version_fd, "%63s", cluster->major_version_str) == 0 ||
        sscanf(cluster->major_version_str, "%d.%d", &integer_version,