[Buildroot] [PATCH] fs: allow extra arguments to common tarball extraction

[Yann E. MORIN <yann.morin.1998@free.fr>]

Carlos, All,

On 2018-06-08 22:06 -0300, Carlos Santos spake thusly:
> > From: "Yann Morin" <yann.morin.1998@free.fr>
> > Why do you need to do so? You can use the 'rootfs' macro, as I already
> > explained, and for which I have already sent a patch to add it to the
> > manual:
> >    https://patchwork.ozlabs.org/patch/926425/
> I've seen your patch and will review it as soon as possible.

OK, great. Thanks! :-)

[--SNIP--]
> >> I understand that this trick avoids changing fs/*/*.mk replacing each
> >> reference to TARGET_DIR by a ROOTFS_<FOO>_TARGET_DIR but it reduces
> >> the readability a lot. I'm compelled to restore it to how it was prior
> >> to commit 7e9870ce32d.
> > 
> > But if you revert that, then TARGET_DIR points to the original target/
> > directory, which does *not* contain the completely-finalised content.
> 
> I pass TARGET_DIR=$(ROOTFS_COMMON_TARGET_DIR) in the environment to

No, don't point to the common one, because that is not parallel-safe!
The whole change was made so that two filesystems could be build in
parallel. Ad=nd since some filesystems want to muck with the layout
(e.g. iso9660), that is not compatible with two filesystems building
simultaneously from the same directory.

At the very least, make TARGET_DIR=$(ROOTFS_$(ROOTFS)_TARGET_DIR) as
Arnout hinted previously.

Regards,
Yann E. MORIN.

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