Add support for update-to-tag and some maintenance commands (#28)

* Add support for update-to-tag and some maintenance commands
* feat: added support for update command update-to-tag
* feat: added support for maintenance commands: changelog-sync,
    changelog-sync-to-tag, clear-checksums, release-locks
* docs: documented new commands in README.md

* Fixes to failing unit tests

README.md

@@ -43,7 +43,13 @@ if __name__ == '__main__':
     liquibase.status()
     liquibase.updateSQL()
     liquibase.update()
+    liquibase.update_to_tag("MyTag")
     liquibase.rollback("MyTag")
+    # liquibase maintenance commands
+    liquibase.changelog_sync()
+    liquibase.changelog_sync_to_tag("MyTag")
+    liquibase.clear_checksums()
+    liquibase.release_locks()
 ```
 
 ## Python Java Integration

pyliquibase/__init__.py

@@ -120,6 +120,14 @@ def update(self):
     def updateSQL(self):
         self.execute("updateSQL")
 
+    def update_to_tag(self, tag: str):
+        """Executes the update-to-tag Liquibase command. `Reference Documentation <https://docs.liquibase.com/commands/update/update-to-tag.html>`_.
+
+        param: tag: Name of a tag in the changelog.
+        """
+        log.debug("Updating to tag: %s" % tag)
+        self.execute("update-to-tag", tag)
+
     def validate(self):
         self.execute("validate")
 
@@ -134,6 +142,32 @@ def rollback_to_datetime(self, datetime):
         log.debug("Rolling back to %s" % str(datetime))
         self.execute("rollbackToDate", datetime)
 
+    def changelog_sync(self):
+        """Executes the changelog-sync Liquibase maintenance command. `Reference Documentation <https://docs.liquibase.com/commands/maintenance/changelog-sync.html>`_.
+        """
+        log.debug("Marking all undeployed changes as executed in database.")
+        self.execute("changelog-sync")
+
+    def changelog_sync_to_tag(self, tag: str):
+        """Executes the changelog-sync-to-tag Liquibase maintenance command. `Reference Documentation <https://docs.liquibase.com/commands/maintenance/changelog-sync-to-tag.html>`_.
+
+        param: tag: Name of a tag in the changelog.
+        """
+        log.debug("Marking all undeployed changes as executed up to tag %s in database." % tag)
+        self.execute("changelog-sync-to-tag", tag)
+
+    def clear_checksums(self):
+        """Executes the clear-checksums Liquibase maintenance command. `Reference Documentation <https://docs.liquibase.com/commands/maintenance/clear-checksums.html>`_.
+        """
+        log.debug("Marking all undeployed changes as executed in database.")
+        self.execute("clear-checksums")
+
+    def release_locks(self):
+        """Executes the release-locks Liquibase maintenance command. `Reference Documentation <https://docs.liquibase.com/commands/maintenance/release-locks.html>`_.
+        """
+        log.debug("Marking all undeployed changes as executed in database.")
+        self.execute("release-locks")
+
     def _download_liquibase(self) -> None:
         if os.path.exists(self.liquibase_dir):
             log.debug("Liquibase version %s found, skipping download..." % str(self.version))