OrderWithRequires(pre) would probably be better for the use case which is
described in this PR, but OrderWithRequires without pre also worked. This is
probably some undocumented behaviour in dependency resolution, probably it
tries to install required packages before the package which requires them, but
I'm not sure.
```
# rpm -E %systemd_ordering
OrderWithRequires(post): systemd
OrderWithRequires(preun): systemd
OrderWithRequires(postun): systemd
```
Implemention of Requires(pre) etc. generators will be ugly because it will
requires to add each RPMTAG separately. It would be nice if the generator could
print e.g. `post: xxx` to stdout, but it cannot be implemented with the current
architecture of generators as far as I understand.
Scriptlets can be converted into files
(https://github.com/rpm-software-management/rpm/issues/1033#issuecomment-583142300),
it would easify making generators for them.
@Conan-Kudo pointed that most scriptlets are designed to fail silently, e.g.
scriptlets that call `systemctl` fail silently if systemd is not installed,
what allows to make a minmal system aithout systemd. Adding 'Requires(pre):
systemd' will break this usecase. 'OrderWithRequires(pre): systemd' would solve
that. In some other cases it is useful to make sure that the binary which is
called is already installed and has all its dependencies satisfied when the
scriptlet is executed. `bash --rpm-requires` can be used to generate
(OrderWith)Requires for scriptlets.
Maybe generatore 'Provides: cmd(xxx)' for files inside /sbin /usr/sbin /bin
/usr/bin and convert the output of `bash --rpm-requires` to
'OrderWithRequires(scriptlet type): cmd(xxx)'
These are just some thoughts...
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