stack/erp5: Add executable to automate mariadb replication bootstrapping

Experimental. Not automatically executed.

Restores given backup, configures service as a slave to given master,
starts replication.

Like for "normal" backup restoration, any running mariadb is killed,
started with backup-restoration-friendly parameters, and killed again once
restored.

As there is AFAIK no way to ask supervisor to start even one of our own
services, this script unfortunately leaves the partition in a
not-immediately useful state.

stack/erp5/buildout.cfg

@@ -167,6 +167,10 @@ stop-on-error = true
 update-command = ${:command}
 command = grep parts ${buildout:develop-eggs-directory}/slapos.cookbook.egg-link
 
+[mariadb-start-clone-from-backup]
+<= download-base
+mode = 755
+
 [mariadb-resiliency-after-import-script]
 <= download-base
 mode = 755
@@ -276,6 +280,7 @@ context =
     key mariadb_location mariadb:location
     key mariadb_resiliency_after_import_script mariadb-resiliency-after-import-script:target
     key mariadb_slow_query_report_script mariadb-slow-query-report-script:target
+    key mariadb_start_clone_from_backup mariadb-start-clone-from-backup:target
     key matplotlibrc_location matplotlibrc:location
     key mesa_location mesa:location
     key onlyoffice_x2t_location onlyoffice-x2t:location

stack/erp5/buildout.hash.cfg

@@ -21,9 +21,13 @@ md5sum = c1f1083bf6c911a0e65dcb841fba327d
 filename = mysql-querydigest.sh.in
 md5sum = cfe6ab8ae54a521ecb269e9d9762cbeb
 
+[mariadb-start-clone-from-backup]
+filename = instance-mariadb-start-clone-from-backup.sh.in
+md5sum = 1af531c51f575a1d1362f2ca2d61620d
+
 [template-mariadb]
 filename = instance-mariadb.cfg.in
-md5sum = 87b046afe5f3fb44e69b185876af4717
+md5sum = 8ea5033142f450a2e90431817771cb44
 
 [template-kumofs]
 filename = instance-kumofs.cfg.in
@@ -67,7 +71,7 @@ md5sum = 0969fbb25b05c02ef3c2d437b2f4e1a0
 
 [template]
 filename = instance.cfg.in
-md5sum = f95174eee2de45d1e3ccb1d5f88355f1
+md5sum = 36bba080d1bc65ea846c249dfb3c1770
 
 [monitor-template-dummy]
 filename = dummy.cfg

stack/erp5/instance-mariadb.cfg.in

@@ -263,6 +263,19 @@ rendered = ${directory:srv}/exporter.exclude
 [dash]
 dash = {{ dumps(dash) }}
 
+[{{ section('start-clone-from-backup') }}]
+< = jinja2-template-executable
+template = {{ parameter_dict['mariadb-start-clone-from-backup'] }}
+rendered = ${directory:bin}/start-clone-from-backup
+context =
+  key dash dash:dash
+  key client binary-wrap-mysql:wrapper-path
+  key data_directory directory:mariadb-data
+  key pid_file my-cnf-parameters:pid-file
+  key server mysqld:rendered
+  key update update-mysql:output
+  key socket my-cnf-parameters:socket
+
 [{{ section('resiliency-after-import-script') }}]
 # Generate after import script used by importer instance of webrunner
 < = jinja2-template-executable

stack/erp5/instance.cfg.in

@@ -183,6 +183,7 @@ link-binary = {{ dumps(mariadb_link_binary) }}
 bin-directory = {{ bin_directory }}
 mariadb-resiliency-after-import-script = {{ mariadb_resiliency_after_import_script }}
 mariadb-slow-query-report-script = {{ mariadb_slow_query_report_script }}
+mariadb-start-clone-from-backup = {{ mariadb_start_clone_from_backup }}
 promise-check-slow-queries-digest-result = {{ bin_directory }}/check-slow-queries-digest-result
 percona-tools-location = {{ percona_toolkit_location }}
 template-monitor = {{ template_monitor }}