bug#36443: Canonicalized build directory name in container leads to confusion (was guix build mixes build dirs?)

[Robert Vollmert]

> On 2. Jul 2019, at 15:37, Ludovic Courtès <l...@gnu.org> wrote:
> 
>>     /* In a sandbox, for determinism, always use the same temporary
>>        directory. */
>> -    tmpDirInSandbox = useChroot ? canonPath("/tmp", true) + "/guix-build-" 
>> + drvName + "-0" : tmpDir;
>> +    tmpDirInSandbox = useChroot ? canonPath("/tmp", true) + "/guix-build-" 
>> + drvName : tmpDir;
> 
> The result would be that the temporary directory would always have a
> different name inside and outside the container.  Consequently,
> debugging along the lines of what the manual suggests (info "(guix)
> Debugging Build Failures") would become pretty much impossible.

Why do you think it would become impossible?