macOS 10.15 Read Only root

Kridsada Thanabulpong sirn at
Sun Jun 30 14:50:11 UTC 2019


I have been running Catalina for a while and from my quick testing of
creating .rootro, reboot, and mkdir /sw, the whole process went through
just fine and /sw become writable (thanks to firmlinks).

I couldn't try creating /opt because I already had it from Mojave.

So far, the only issue seems to be you cannot completely remove /opt or
/sw anymore once they're created. mkdir is fine, but rmdir'ing them will
result in "Operation not permitted" error.

I'm not able to test if this is still the case with the Public Beta 
(my MacBook has battery defect). I can experiment again once I regain
access to a Mac.


Ryan Schmidt <ryandesign at> writes:

> On Jun 29, 2019, at 19:53, Mark Anderson wrote:
>> Do we have any plans with how to deal with 10.15 not allowing us to create /opt if it doesn’t exist? Or does /opt just come with the file system? I can’t remember.
> macOS does not come with an /opt directory.
> I was not aware that macOS Catalina will prevent the creation of such directories, but I haven't read up on the new system yet. If that is true, then that sounds like a problem for us.
> Just a reminder, make sure that anything discussed about Catalina on this mailing list is information that has already been publicly released.

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