[Rpm-maint] [rpm-software-management/rpm] %pre runs after existing filesystem is inspected (Issue #1934)

[Alex Iribarren]

I'm trying to create an RPM to start packaging some config files that were previously created manually and I've discovered a weird behavior I wasn't aware of. It seems the `%pre` scriptlet runs later than I would expect, after the existing filesystem has been analyzed.

Consider the following spec file:

```
Name:           scripts
Version:        1.0
Release:        1
Summary:        Testing script behavior
Group:          Testing
License:        GPL
BuildArch:	noarch

%description
%{summary}

%install
mkdir -p %{buildroot}/tmp/test/

echo "hello" > %{buildroot}/tmp/test/test.conf

%files
%defattr(-,root,root,-)
%config(noreplace) /tmp/test/test.conf

%pre
echo %{name}-%{version}-%{release} PRE $*
if [[ $1 -eq 1 ]]; then
    [[ ! -s /tmp/test/test.conf ]] && rm -f /tmp/test/test.conf
fi
ls -l /tmp/test/
echo %{name}-%{version}-%{release} PRE DONE
exit 0
```

Build the RPM and then run the following commands: `mkdir -p /tmp/test/ && touch /tmp/test/test.conf`

If you then install the RPM, you'll see the following:

```
...
Transaction test succeeded.
Running transaction
  Preparing        :                                                                                                                    1/1 
  Running scriptlet: scripts-1.0-1.noarch                                                                                               1/1 
scripts-1.0-1 PRE 1
total 0
scripts-1.0-1 PRE DONE

  Installing       : scripts-1.0-1.noarch                                                                                               1/1 
warning: /tmp/test/test.conf created as /tmp/test/test.conf.rpmnew

  Verifying        : scripts-1.0-1.noarch                                                                                               1/1 

Installed:
  scripts-1.0-1.noarch   
```

Notice that the `%pre` script deleted the empty `/tmp/test/test.conf`, as it should. However, the new config file is created as `/tmp/test/test.conf.rpmnew`, even though `/tmp/test/test.conf` no longer exists!

Is this behavior expected?

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