Merge "Dump and restore galera db during major upgrades"

1 files changed, 44 insertions, 0 deletions

diff --git a/extraconfig/tasks/major_upgrade_pacemaker_migrations.sh b/extraconfig/tasks/major_upgrade_pacemaker_migrations.sh
index b63198db..164269dc 100644
--- a/extraconfig/tasks/major_upgrade_pacemaker_migrations.sh
+++ b/extraconfig/tasks/major_upgrade_pacemaker_migrations.sh
@@ -13,6 +13,50 @@
 # been already applied, it should be possible to call the function
 # again without damaging the deployment or failing the upgrade.
 
+# If the major version of mysql is going to change after the major
+# upgrade, the database must be upgraded on disk to avoid failures
+# due to internal incompatibilities between major mysql versions
+# https://bugs.launchpad.net/tripleo/+bug/1587449
+# This function detects whether a database upgrade is required
+# after a mysql package upgrade. It returns 0 when no major upgrade
+# has to take place, 1 otherwise.
+function is_mysql_upgrade_needed {
+    # The name of the package which provides mysql might differ
+    # after the upgrade. Consider the generic package name, which
+    # should capture the major version change (e.g. 5.5 -> 10.1)
+    local name="mariadb"
+    local output
+    local ret
+    set +e
+    output=$(yum -q check-update $name)
+    ret=$?
+    set -e
+    if [ $ret -ne 100 ]; then
+        # no updates so we exit
+        echo "0"
+        return
+    fi
+
+    local currentepoch=$(rpm -q --qf "%{epoch}" $name)
+    local currentversion=$(rpm -q --qf "%{version}" $name)
+    local currentrelease=$(rpm -q --qf "%{release}" $name)
+    local newoutput=$(repoquery -a --pkgnarrow=updates --qf "%{epoch} %{version} %{release}\n" $name)
+    local newepoch=$(echo "$newoutput" | awk '{ print $1 }')
+    local newversion=$(echo "$newoutput" | awk '{ print $2 }')
+    local newrelease=$(echo "$newoutput" | awk '{ print $3 }')
+
+    # With this we trigger the dump restore/path if we change either epoch or
+    # version in the package If only the release tag changes we do not do it
+    # FIXME: we could refine this by trying to parse the mariadb version
+    # into X.Y.Z and trigger the update only if X and/or Y change.
+    output=$(python -c "import rpm; rc = rpm.labelCompare((\"$currentepoch\", \"$currentversion\", None), (\"$newepoch\", \"$newversion\", None)); print rc")
+    if [ "$output" != "-1" ]; then
+        echo "0"
+        return
+    fi
+    echo "1"
+}
+
 function add_missing_openstack_core_constraints {
     # The CIBs are saved under /root as they might contain sensitive data
     CIB="/root/migration.cib"