A minimalistic CouchDB replicator in Bash with curl and jq

replicate.sh

  curl --silent "$source_url/_changes?feed=normal&style=all_docs" \
    | jq '.results | reduce .[] as $change ({}; . + { ($change.id): $change.changes | map(.rev) } )' \
    | curl --silent -XPOST "$target_url/_revs_diff" -d@- -H 'Content-Type:application/json' \
    | jq 'to_entries | reduce .[] as $entry ([]; . + ($entry.value.missing | map({ id: $entry.key, rev: . }))) | { docs: . }' \
    | curl --silent -XPOST "$source_url/_bulk_get?revs=true&attachments=true" -d@- -H 'Content-Type:application/json' \
    | jq '.results | map(.docs) | reduce .[] as $docs ([]; . + ($docs | map(.ok))) | { docs: ., new_edits: false }' \
    | curl --silent -XPOST "$target_url/_bulk_docs" -d@- -H 'Content-Type:application/json' \
    | jq

See https://docs.couchdb.org/en/3.2.0/replication/protocol.html