Add support for brew services on external drives on Mac

[rgaufman]

Most people purchasing a Mac with the base storage run their home directory on an external drive, however homebrew-services does not work in this situation and shows this error:

$ brew services start mosquitto
Bootstrap failed: 5: Input/output error
Try re-running the command as root for richer errors.
Error: Failure while executing; `/bin/launchctl bootstrap gui/502 /Volumes/980Pro/home/hackeron/Library/LaunchAgents/homebrew.mxcl.mosquitto.plist` exited with 5.

Please add support for those of us that have their home directory on an external drive.

[SMillerDev]

That's an error from launchctl. Nothing brew can do to fix that.

[MikeMcQuaid]

Most people purchasing a Mac with the base storage run their home directory on an external drive

Also: this is not at all true.

[rgaufman]

Most people purchasing a Mac with the base storage run their home directory on an external drive

Also: this is not at all true.

Sorry, those that have larger photo libraries / apps, things like xcode in combination, etc. It's becoming more and more popular - if you're not doing this on a base storage desktop Mac, I highly recommend trying it, it's pretty game changing.

In any case, it's not directly relevant, storing service files on external media is not supported by MacOS so doing so seems like a bug, not intentional behaviour.

[rgaufman]

Solution here: #862