Added changes to fix issue #73 and added support for Catalina

[cipaterson]

My first pull request... Go easy on me if I've not followed conventions correctly.
I fixed path changes reported in issue #73 for Mojave and added support for Catalina.
Making a Catalina iso works fine for me, but I had to work around the "operation not permitted" error from asr.

[geerlingguy]

Remind me if I don't get around to merging this soon :D

[catap]

@geerlingguy 👋

[geerlingguy]

lol oops!

[geerlingguy]

Hmm... this is conflicting with the addition of Big Sur. Can you rebase with the latest changes?

[catap]

@geerlingguy let ask @cipaterson ! I just read this issues and when I read that you asked to ping you if you forgot about that... well.. I've pinged you :)

[cipaterson]

@geerlingguy, @catap , I have rebased the Big Sur changes into my fork/branch. My existing pull request should merge clean now.
I don't think the script will produce a Big Sur iso as the other if statements need to be altered too (as Jeff noted). Maybe the way to fix that is to "invert" the if/else causes. i.e. put the latest working case in the else and the code for earlier MacOS installers in explicit if clauses. Like this:
echo Remove Package link and replace with actual files
echo --------------------------------------------------------------------------
if [ "${isoName}" == "Yosemite" ] || [ "${isoName}" == "ElCapitan" || [ "${isoName}" == "Sierra" ] ; then
echo $ rm /Volumes/OS\ X\ Base\ System/System/Installation/Packages
rm /Volumes/OS\ X\ Base\ System/System/Installation/Packages
echo $ cp -rp /Volumes/install_app/Packages /Volumes/OS\ X\ Base\ System/System/Installation/
cp -rp /Volumes/install_app/Packages /Volumes/OS\ X\ Base\ System/System/Installation/
elif [ "${isoName}" == "HighSierra" ] ; then
echo $ ditto -V /Volumes/install_app/Packages /Volumes/OS\ X\ Base\ System/System/Installation/
ditto -V /Volumes/install_app/Packages /Volumes/OS\ X\ Base\ System/System/Installation/
else
echo $ ditto -V /Volumes/install_app/Packages /Volumes/macOS\ Base\ System/System/Installation/
ditto -V /Volumes/install_app/Packages /Volumes/macOS\ Base\ System/System/Installation/
fi
Then any latest installer added has some hope it will just work (if it works like the last version)...

[catap]

@cipaterson I agree with you that this script won't work with Big Sur. Why? Because Big Sur installer contains SharedSupport.dmg instead of InstallESD.dmg and structure is quite different.