Re: [PATCH] kernel/linux: Allow user to manually enter Linux version

["Yann E. MORIN" <yann dot morin dot 1998 at free dot fr>]

Andy, All,

On Monday 07 January 2013 ANDY KENNEDY wrote:
> Please forgive the ignorance, but was is a driver script?

Oh, sure! :-)
A simple driver script could be something like:

---8<---
#!/bin/sh
# Call this script something witty, eg.: my-ct-ng  ;-)
set -e

KVER="X.Y.Z"
KDIR="linux-${KVER}"
KFILE="${KDIR}.tar.bz2"
KURL="http://kernel.org/pub/..../${KFILE}";

if [ ! -f "${KDIR}" ]; then
    if [ ! -f "${KFILE}" ]; then
        curl "${KURL}" >"${KFILE}"
    fi
    tar xjf "${KFILE}"
fi

exec ct-ng "${@}"
---8<---

Well, totally untested. You can refine to your case (eg. git clone +
git checkout instead of curl...), but you get the idea.

In this case, you're using ct-ng as a "backend" for your real build system,
which in this case is your very, very minimalist "my-ct-ng" script.

Hence, we call this script a "driver", because it "drives" a sub-process
(here ct-ng), that is it prepares the environment, or some dirs/files...
prior to running the actual program.

That's exactly what "gcc" (the command) is: it is a compiler driver, that
parses its arguments to see how it was called, and what sub-process it
should call: actuall C compiler (cc1), C++ compiler (cc1plus), linker (ld)
and so on...

No, it's not in ct-ng's documentation, because it is not specific to
ct-ng. It is a usually-accepted term (I guess). Sometime also referred
to as a frontend, but it is does convey a different, although somewhat
related. meaning.

Regards,
Yann E. MORIN.

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