[Buildroot] [PATCH-NEXT 2/4] package/linux-firmware.mk: get rid of temporary tarball for file installation

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

Peter, All,

On 2021-02-12 22:07 +0100, Yann E. MORIN spake thusly:
> On 2021-02-12 21:39 +0100, Yann E. MORIN spake thusly:
> > On 2021-02-12 19:40 +0100, Peter Korsgaard spake thusly:
> > > There is no specific reason to use a temporary file, we can just as well
> > > pipe the two tar invocations together, so do that instead.
> > Actually, there *is* a reason why an intermediate tarball is used, see
> > commit 21a283ffb0d (linux-firmware: fail build for missing file).
> 
> Of course, I missed providing a suggestion, so here it is, see below...
> 
> [--SNIP--]
> > > Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
> > > ---
> > >  package/linux-firmware/linux-firmware.mk | 4 ++--
> > >  1 file changed, 2 insertions(+), 2 deletions(-)
> > > 
> > > diff --git a/package/linux-firmware/linux-firmware.mk b/package/linux-firmware/linux-firmware.mk
> > > index 3420266335..b6549ad371 100644
> > > --- a/package/linux-firmware/linux-firmware.mk
> > > +++ b/package/linux-firmware/linux-firmware.mk
> > > @@ -641,8 +641,8 @@ endif
> > >  ifneq ($(LINUX_FIRMWARE_FILES),)
> > >  define LINUX_FIRMWARE_INSTALL_FILES
> > >  	cd $(@D) && \
> > > -		$(TAR) cf install.tar $(sort $(LINUX_FIRMWARE_FILES)) && \
> > > -		$(TAR) xf install.tar -C $(1)
> > > +		$(TAR) c $(sort $(LINUX_FIRMWARE_FILES)) | \
> > > +		$(TAR) x -C $(1)
> 
> First, I think we should merge INSTALL_FILES and INSTALL_DIRS together
> in a single command; there is no reason why we could not put directories
> in a tarball...
> 
> Seconf, we should =create the archive once in _BUILD_CMDS. Then we can
> extract it in _INSTALL_TARGET_CMDS and _INSTALL_IMAGES_CMDS.

I whipped up something quick during my morning coffee:

https://git.buildroot.org/~ymorin/git/buildroot/commit/?h=yem/linux-fw-rework&id=8dd299681fdf80c284680833175387ac6a428a11

Lightly tested by enabling a random set of firmwares, and comparing the
lists of installed files before/after are identical. Then tested by
enabling all firmwares. No delta in either case: it installed the same
set of files, and there was no missing/extra ones.

Regards,
Yann E. MORIN.

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