--config not respected during migration

Version/Platform/Processor information (from `ipfs version --all`):
go-ipfs version: 0.4.3-rc3-
Repo version: 4 (--config also not respected by ipfs version --all)
System version: amd64/linux
Golang version: go1.6.2

Type (bug, feature, meta, test failure, question): bug
Area (api, commands, daemon, fuse, etc): commands
Priority (from P0: functioning, to P4: operations on fire): P1

Description:
I can't migrate my nonstandard repo location. --config is ignored. ipfs keeps migrating ~/.ipfs instead of the path I pass in. It seems the parameter is not passed on to the migration binary.