lib/mysql-functions: make mysql_determine_majority_build_slave_architecture_id more robust

* when there are no logs, it would return empty and break the next sql syntactically
* give -1 instead, this should not match anything

1 files changed, 17 insertions, 13 deletions

diff --git a/lib/mysql-functions b/lib/mysql-functions
index c27babc..54de45e 100755
--- a/lib/mysql-functions
+++ b/lib/mysql-functions
@@ -1755,20 +1755,24 @@ mysql_query_ordering_correct() {
 # active build slaves
 mysql_determine_majority_build_slave_architecture_id() {
   {
-    printf 'SELECT'
-    printf ' COUNT(DISTINCT `ssh_log`.`id`) AS `count`,'
-    printf '`architectures`.`id`'
-    printf ' FROM `ssh_log`'
-    printf ' JOIN `architectures`'
-    printf ' ON `ssh_log`.`parameters`=CONCAT(`architectures`.`name`," ")'
-    printf ' WHERE `action`="get-assignment"'
-    printf ' AND `ssh_log`.`date`>ADDTIME(NOW(),"-1 00:00:00")'
-    printf ' GROUP BY `ssh_log`.`parameters`'
-    printf ' ORDER BY `count` DESC'
-    printf ' LIMIT 1'
+    {
+      printf 'SELECT'
+      printf ' COUNT(DISTINCT `ssh_log`.`id`) AS `count`,'
+      printf '`architectures`.`id`'
+      printf ' FROM `ssh_log`'
+      printf ' JOIN `architectures`'
+      printf ' ON `ssh_log`.`parameters`=CONCAT(`architectures`.`name`," ")'
+      printf ' WHERE `action`="get-assignment"'
+      printf ' AND `ssh_log`.`date`>ADDTIME(NOW(),"-1 00:00:00")'
+      printf ' GROUP BY `ssh_log`.`parameters`'
+      printf ' ORDER BY `count` DESC'
+      printf ' LIMIT 1'
+    } | \
+      mysql_run_query | \
+      cut -f2
+    echo '-1'
   } | \
-    mysql_run_query | \
-    cut -f2
+    head -n1
 }
 
 # mysql_query_delete_packages $package_sources_condition $repositories_condition