Experiences with union mounts in MacOS?

Daniel J. Luke dluke at geeklair.net
Mon Dec 17 16:32:51 UTC 2018

On Dec 16, 2018, at 11:03 AM, Ces VLC <cesarillovlc at gmail.com> wrote:
> 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.

it would be interesting to see how well it worked (or didn't work), but I wouldn't want to rely on it for anything important.

> 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?

I have a vague recollection of having problems with it back when I tried to use it for something that sounds similar (I wanted to use it to isolate changes made by a build or packaging system from the underlying OS). I don't recall why I ended up stopping that experiment, though. Since you're already using disk images, though - maybe you can use a shadowfile to get one layer of image combining?

Daniel J. Luke

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