Experiences with union mounts in MacOS?

[Michael]

Yea. Short answer: DON'T.

Long answer: Mac OS does not support union mounts. They're there, they are honored by posix programs, but everything that using the apple file system interface bypasses it.

Which means that just about anything based on cocoa framekworks ... optimizes and bypasses union mount visibility.

I ran into  this back on 10.7, and complained, only to get basically this back from apple support engineers.


On 2018-12-16, at 8:03 AM, Ces VLC <cesarillovlc at gmail.com> wrote:

> Hi!
> 
> Sorry for this partially off-topic post, but couldn't imagine another place with more people likely to having experiences with little known MacOS UNIX features than this.
> 
> In order to ease the testing of some builds, I had the idea of using union mounts ("mount -o union") to merge several DMGs together in the same folder.
> 
> But I'm a bit afraid because it seems to be a little used feature in the Mac, so, if I'll be the only one in the planet using it, I guess it can be like sort of a minefield walk, likely to use little-tested stuff.
> 
> I searched for it, and the only problems I saw reported is that Finder doesn't seem to honor union mounts, but that wouldn't be a problem for me, as I won't be using Finder for browsing the mount directory. If it works fine at the Terminal, then it's fine for me.
> 
> Do you have any experience using union mounts on MacOS? Did it work fine for you? Did you find any problem/issues?
> 
> Thanks!
> 
> César
> 
> 
> 
>  

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