[Buildroot] [git commit] fs: add rootfs dependencies to PACKAGES

From: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
To: buildroot@busybox.net
Subject: [Buildroot] [git commit] fs: add rootfs dependencies to PACKAGES
Date: Tue, 14 Apr 2015 13:54:24 +0200	[thread overview]
Message-ID: <20150414135424.3b1ab04a@free-electrons.com> (raw)
In-Reply-To: <552CF0E1.5090205@mind.be>

Dear Arnout Vandecappelle,

On Tue, 14 Apr 2015 12:50:09 +0200, Arnout Vandecappelle wrote:

> > diff --git a/fs/common.mk b/fs/common.mk
> > index cac127f..41ee86d 100644
> > --- a/fs/common.mk
> > +++ b/fs/common.mk
> > @@ -106,6 +106,7 @@ rootfs-$(1): $$(BINARIES_DIR)/rootfs.$(1) $$(ROOTFS_$(2)_POST_TARGETS)
> >  
> >  ifeq ($$(BR2_TARGET_ROOTFS_$(2)),y)
> >  TARGETS_ROOTFS += rootfs-$(1)
> > +PACKAGES += $$(ROOTFS_$(2)_DEPENDENCIES)
> 
>  This will break the rest of your series for filesystems like ubi and initramfs
> that depend on another filesystem, because filesystems are not really packages
> so they shouldn't be in PACKAGES.

Aaah, indeed. Thanks a lot for catching this!

But I believe the package dependencies should be in PACKAGES, so that
"make external-deps", "make legal-info", "make source" and so on
properly take into account the packages needed as a dependency of
building a rootfs image.

I can see several solutions here:

 1) In the fs infrastructure, separate package dependencies from
    filesystem dependencies, like ROOTFS_UBI_FS_DEPENDENCIES =
    rootfs-ubifs, and ROOTFS_UBIFS_PACKAGE_DEPENDENCIES = host-mtd.
    This is probably the easiest solution, maybe not the prettiest one.

 2) Simply filter out from $$(ROOTFS_$(2)_DEPENDENCIES) the targets
    that start with 'rootfs-' when adding them to the PACKAGES variable.
    Maybe not that pretty either, but very simple to do.

 3) Adjust the fs infrastructure so that the rootfs-<foo> targets will
    also have rootfs-<foo>-legal-info, rootfs-<foo>-source,
    rootfs-<foo>-source-check and so on, a bit like we already
    implement rootfs-<foo>-show-depends.

 4) Make the filesystem image stuff real packages. After all, they
    install something to $(BINARIES_DIR) and some other packages do it.
    Of course, the big difference is that they should have a special
    type so that they get built only after all other packages have been
    built/installed, the post-build scripts, overlay and so on have
    been handled.

(1), (2) and (3) are pretty easy, (4) is a lot more work, and I don't
know if the result will be very useful, but I don't know.

Thoughts?

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com