APFS clone for Xcode cloning

[andrebraga]

The copy option of install.sh to clone Xcode currently uses:

sudo cp -Rp "/Applications/Xcode.app" "/Applications/XcodeWithPlugins.app"

It would be really nice to use the -c flag on APFS volumes in order to perform a copy-on-write clone. It's faster and saves disk space.

According to man 1 cp:

-c copy files using clonefile(2)

stat -f "%Sd" /Applications/Xcode.app can be used to check the device name Xcode currently resides in. Skeletal test, probably not super efficient:

if [[ $(diskutil info $(stat -f "%Sd" /Applications/Xcode.app) | grep APFS | wc -l) -gt 0 ]]; then
    # use '-c'
else
    # use normal copy
fi

[alanhamlett]

Thanks!