Fix version numbering foulups exposed by 10.1.

configure computed PG_VERSION_NUM incorrectly.  (Coulda sworn I tested
that logic back when, but it had an obvious thinko.)

pg_upgrade had not been taught about the new dispensation with just
one part in the major version number.

Both things accidentally failed to fail with 10.0, but with 10.1 we
got the wrong results.

Per buildfarm.

1 files changed, 13 insertions, 5 deletions

diff --git a/src/bin/pg_upgrade/server.c b/src/bin/pg_upgrade/server.c
index 3e3323a6e8a..a91f18916c7 100644
--- a/src/bin/pg_upgrade/server.c
+++ b/src/bin/pg_upgrade/server.c
@@ -156,8 +156,8 @@ get_major_server_version(ClusterInfo *cluster)
 {
 	FILE	   *version_fd;
 	char		ver_filename[MAXPGPATH];
-	int			integer_version = 0;
-	int			fractional_version = 0;
+	int			v1 = 0,
+				v2 = 0;
 
 	snprintf(ver_filename, sizeof(ver_filename), "%s/PG_VERSION",
 			 cluster->pgdata);
@@ -165,13 +165,21 @@ get_major_server_version(ClusterInfo *cluster)
 		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,
-			   &fractional_version) < 1)
+		sscanf(cluster->major_version_str, "%d.%d", &v1, &v2) < 1)
 		pg_fatal("could not parse PG_VERSION file from %s\n", cluster->pgdata);
 
 	fclose(version_fd);
 
-	return (100 * integer_version + fractional_version) * 100;
+	if (v1 < 10)
+	{
+		/* old style, e.g. 9.6.1 */
+		return v1 * 10000 + v2 * 100;
+	}
+	else
+	{
+		/* new style, e.g. 10.1 */
+		return v1 * 10000;
+	}
 }