versionx links
Manage external links (submodule / subtree / virtual / ref)
Subcommands
sync
Sync every declared link (check out submodules / verify virtuals / …)
check-updates
Report whether each link is ahead of or behind its upstream
update
Update each link to the latest upstream tip on its track ref
pull
Pull where the link kind supports it (subtree / virtual)
push
Push where the link kind supports it (subtree)