Although I saw a topic with the same symptom, the resulting posts didn’t appear to align with our circumstances. When restoring a backup tar.gz from one Discourse instance to another, we received this error:
As part of troubleshooting, I entered the container and executed the following command to verify that what the
restorer is doing to extract the
meta.json file is working.
# tar --extract --file ./shared/backups/default/discussion-forums-pilot-meta-2015-10-01-215138.tar.gz meta.json
The file appears to be extracted cleanly: