xcodebuild wants to write to $HOME/Library/Developer (was: Re: Editing Git history with GitUp)

[Ken Cunningham]

You might check the two mulle* ports I added last year. One lets you dump all the settings in a project, the other lets you set them on the fly in a portfile. 

K

Sent from my iPhone

> On Apr 2, 2018, at 10:11 AM, Rainer Müller <raimue at macports.org> wrote:
> 
>> On 2018-03-23 11:17, Mojca Miklavec wrote:
>> I just stumbled upon this app (I haven't tested it yet) which might be
>> able to avoid some pain when editing git history before pushing your
>> changes upstream:
>>    http://gitup.co
> 
> Thank you for the this tip. I especially like the visualization of
> branches in GitUp a lot.
> 
> As GitUp is open source software, I tried to create a port for it.
> However, I ran into strange problems with xcodebuild.
> 
> Here is the work in progress Portfile:
> https://github.com/raimue/macports-ports/blob/gitup/devel/GitUp/Portfile
> 
> The build fails with this error message (ignoring other messages from
> com.apple.CoreSimulator.SimError, which I have seen before and seem
> harmless):
> 
> ---
> Build Preparation
> Couldn't create workspace arena folder '/opt/local/var/macports/home/Library/Developer/Xcode/DerivedData/GitUp-fnbahhvyzxfjjddhqkxlurazjuhj': You don’t have permission to save the file “GitUp-fnbahhvyzxfjjddhqkxlurazjuhj” in the folder “DerivedData”.
> Couldn't create module cache folder '/opt/local/var/macports/home/Library/Developer/Xcode/DerivedData/ModuleCache': Unable to create directory: /opt/local/var/macports/home/Library/Developer/Xcode/DerivedData/ModuleCache (Operation not permitted)
> Couldn't update module cache session file '/opt/local/var/macports/home/Library/Developer/Xcode/DerivedData/ModuleCache/Session.modulevalidation': The folder “Session.modulevalidation” doesn’t exist.
> ---
> 
> My system is currently running:
> macOS 10.12.6 16G1212
> Xcode 9.2 9C40
> 
> The problem here is that xcodebuild is not respecting $HOME from the
> environment, but uses the home directory of the macports user as set in
> directory service. This path is not writable, as it is shared between
> all port builds and we do not want builds to influence each other.
> 
> As you can see in the Portfile linked above, I already tried to pass an
> explicit HOME variable and also some other variables that the Xcode
> build settings reference [1] suggested.
> 
> The commented line can be used to make xcodebuild dump all build
> settings and their values.
> 
> Do we have any Xcode experts with another idea which path setting needs
> to be changed to avoid accessing $HOME/Library/Developer?
> 
> Rainer
> 
> [1] Current: http://help.apple.com/xcode/mac/9.3/#/itcaec37c2a6 (could not find the same for 9.2)
>    Retired: https://developer.apple.com/legacy/library/documentation/DeveloperTools/Reference/XcodeBuildSettingRef/1-Build_Setting_Reference/build_setting_ref.html#//apple_ref/doc/uid/TP40003931-CH3-SW51 (more detailed)