macOS 10.15 Read Only root

[Chris Jones]

On 30/06/2019 10:19 pm, Mark Anderson wrote:
> I actually just tried. I have an /opt but I can create and delete other 
> things in the root. So we may be ok. I’ll keep an eye on it.

If you can create anything in / then you don't have your system area 
mount read only yet. Note that this is not yet the default in the 
current betas.

> 
> Obviously anything in /bin or /usr that isn’t /usr/local is off limits.
> 
> —Mark
> 
> On Sun, Jun 30, 2019 at 10:50 AM Kridsada Thanabulpong <sirn at ogsite.net 
> <mailto:sirn at ogsite.net>> wrote:
> 
>     Hi,
> 
>     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.
> 
>     Regards,
>     Kridsada
> 
>     Ryan Schmidt <ryandesign at macports.org
>     <mailto:ryandesign at macports.org>> 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.
>      >
>      > https://trac.macports.org/wiki/FAQ#prerelease
>