On Jun 25, 2021, at 21:03, Tabitha McNerney wrote: > On a fresh Catalina or Big Sure system, if you cd to root / then sudo then > try mkdir /opt or something else such as mkdir /hello the system won't allow > it, I get this: > > mkdir: /hello: Read-only file system > > note: the MacBook I just tried this on also has FileVault enabled and its got > one of those Apple T2 chips with a touch bar > > How does the MacPorts Catalina or Big Sur pkg installer work around this > restriction?
I don't know that we're doing anything. It just works. There is some mechanism, that I don't understand, by which the system volume and the data volume are combined into a single presentation. Presumably the Installer app knows that you cannot install to the system volume, so it installs MacPorts to the data volume.
