linux-kernel - Debian build polishing

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Date:   Fri,  8 Mar 2019 13:44:19 +0100
From:   "Enrico Weigelt, metux IT consult" <info@...ux.net>
To:     linux-kernel@...r.kernel.org
Cc:     yamada.masahiro@...ionext.com, michal.lkml@...kovi.net,
        info@...ux.net, apw@...onical.com, joe@...ches.com,
        linux-kbuild@...r.kernel.org, linux-riscv@...ts.infradead.org
Subject: Debian build polishing

Hi folks,

here're some patches for polishing up the Debian packaging stuff,
so it can be directly used w/ usual Debian machinery like
pbuilder, git-buildpackage, dck-buildpackage, etc.

These expect debian/rules to exist in the unpacked/patched tree
and drive the whole build. Currently 'make deb-pkg' does it in
the opposite direction - it creates debian/rules and fills in
some data, that's derived from .config etc.

My goal is building the kernel package in exactly the same way as
any other Debian package - so there must be a debian/rules as the
primary entry point. To do that, w/ minimal change and w/o breaking
the existing machinery, I'm going in several steps:

#1: add Makefile rules for retrieving missing makefile-internal
    variables kernel config system .config (eg. kernel arch).

    this could be used for other build systems, too.
    just call: `make kernelarch` or `make kernellocalversion`

#2: add an env variable for changing the name of the rules file
    generated by mkdebian. When coming from an existing rules
    file, we can prevent this from being overwritten.

#3: add a generic debian/rules file, that calls mkdebian to
    create the remaining debian control files (w/ rules redirected
    into nirvana)

The existing `make deb-pkg` is bypassed and remains ontouched.

One point still puzzling me: once the debian/rules is applied and
somebody calls `make deb-pkg`, he'll end up w/ unclean tree, as
now a git-tracked file is changed.

Perhaps I just change deb-pkg to call debian/rules then, but I'd
like to hear your oppinions about this, before.

What do you think about that ?

--mtx