Fix previous release detection

scripts/bash_lib.sh

@@ -180,17 +180,21 @@ deb_setup_mariadb_mirror() {
     bb_log_err "missing the branch variable"
     exit 1
   }
-  branch=$1
-  if [[ $branch == "$development_branch" ]]; then
-    #TOFIX - temp hack
-    prev_released=$((${branch/1[0-9]./} - 1))
-    if ((prev_released < 0)); then
-      branch="10.11"
+  branch_tmp=$1
+  major=${branch_tmp%.*}
+  minor=${branch_tmp##*.}
+  if [[ $minor == "0" ]]; then
+    if [[ $major == "11" ]]; then
+      prev_release="10.11"
     else
-      branch="10.$prev_released"
+      bb_log_err "Unknown previous branch for $branch_tmp, please update this script"
+      exit 1
     fi
-    bb_log_info "using previous $branch released version for development branch $1"
+  else
+    prev_release="$major.$((minor - 1))"
   fi
+  branch=$prev_release
+  bb_log_info "using previous $branch released version for development branch $1"
   bb_log_info "setup MariaDB repository for $branch branch"
   command -v wget >/dev/null || {
     bb_log_err "wget command not found"
@@ -209,8 +213,12 @@ deb_setup_mariadb_mirror() {
       exit 1
     }
   else
-    bb_log_err "deb_setup_mariadb_mirror: $branch packages for $dist_name $version_name does not exist on https://deb.mariadb.org/"
-    exit 1
+    # the correct way of handling this would be to not even start the check
+    # since we know it will always fail. But apparently, it's not going to
+    # happen soon in BB. Once done though, replace the warning with an error
+    # and use a non-zero exit code.
+    bb_log_warn "deb_setup_mariadb_mirror: $branch packages for $dist_name $version_name does not exist on https://deb.mariadb.org/"
+    exit 0
   fi
   set +u
 }