+# --locked
+# --target-dir=target
+#
+# -T | --no-cargo-target-arg
+# -t | --cargo-target-arg
+# Suppress --target (or un-suppress it). Only useful with -m.
+# Done automatically when nailing-cargo sees that the cargo
+# subcommand is one which needs it, eg `fetch'.
+#
+# --online | -o
+# --offline | -O
+# Whether to allow cargo to make network access.
+# (nailing-cargo always passes --offline to cargo, unless
+# --online is in force). The default is offline,
+# unless the cargo subcommand is one which implies
+# online (currently, `fetch').