bug#45279: [core-updates] copy-recursively does not throw an error on missing directory

[Mark H Weaver]

Ludovic Courtès <ludo@gnu.org> writes:

> Marius Bakke <marius@gnu.org> skribis:
>
>> On the 'core-updates' branch, using copy-recursively on a nonexistent
>> directory does not cause a build failure.  Instead an error is printed
>> and the script continues:
>>
>>   (copy-recursively "doesnotexist" output)
>>   [...]
>>   starting phase `install'
>>   i/o error: doesnotexist: No such file or directory
>>   phase `install' succeeded after 0.0 seconds
>>
>> This is on cc6cb6e80a42355147809b4830053a34d1563994.
>
> I think it’s always been this way.  Do you think we should change it?

In general, I think it's a good idea to raise errors for things like
this.  Warnings that only end up in build logs are likely to go
unnoticed for a long time.

      Mark