[Buildroot] [PATCHv2] package/linux-firmware: fix special cases of symlinks

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

Antoine, All,

On 2020-03-04 21:26 +0100, Antoine Tenart spake thusly:
> On Wed, Mar 04, 2020 at 05:55:32PM +0100, Yann E. MORIN wrote:
> > From: Antoine Tenart <antoine.tenart@bootlin.com>
> > 
> > Some symlinks were not created correctly when installing the
> > Linux-firmware package. This patch fixes the support for all symlinks of
> > the form:
> > 
> >   a/foo -> bar
> >   a/foo -> b/bar
> >   a/foo -> ../b/bar
> > 
> > With this patch all forms of symlinks described in the WHENCE file
> > should be supported, whether they are in nested directories, or in
> > non-existing ones.
> > 
> > As some symlinks could be in directories that do not exist, we must
> > maje sure to canonicalize the path before testing the linked-to file.
> > 
> > We compared the symlinks installed pre-20200122 to what we have now, and
> > it seems we're handling all of them with this patch.
> > 
> > Fixes: 55df4059d24b ("package/linux-firmware: fix symlink support")
> > Signed-off-by: Antoine Tenart <antoine.tenart@bootlin.com>
> > [yann.morin.1998 at free.fr:
> >   - use readlink in canonicalize-missing mode, to avoid
> >     creating-then-removing directories
> > ]
> > Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
> 
> I tested it and it looks good.

I took that as a hint to add your Tested-by: and Reviewed-by: tags to
the commit.

Applied to next. Thanks!

Regards,
Yann E. MORIN.

> Thanks,
> Antoine
> 
> > ---
> >  package/linux-firmware/linux-firmware.mk | 12 +++++++++---
> >  1 file changed, 9 insertions(+), 3 deletions(-)
> > 
> > diff --git a/package/linux-firmware/linux-firmware.mk b/package/linux-firmware/linux-firmware.mk
> > index 009202d604..6d3cec1a48 100644
> > --- a/package/linux-firmware/linux-firmware.mk
> > +++ b/package/linux-firmware/linux-firmware.mk
> > @@ -609,12 +609,18 @@ endif
> >  # automatically by its copy-firmware.sh script during the installation, which
> >  # parses the WHENCE file where symlinks are described. We follow the same logic
> >  # here, adding symlink only for firmwares installed in the target directory.
> > -# The grep/sed parsing is taken from the script mentioned before.
> > +#
> > +# For testing the presence of firmwares in the target directory we first make
> > +# sure we canonicalize the pointed-to file, to cover the symlinks of the form
> > +# a/foo -> ../b/foo  where a/ (the directory where to put the symlink) does
> > +# not yet exist.
> >  define LINUX_FIRMWARE_CREATE_SYMLINKS
> > +	cd $(TARGET_DIR)/lib/firmware/ ; \
> >  	sed -r -e '/^Link: (.+) -> (.+)$$/!d; s//\1 \2/' $(@D)/WHENCE | \
> >  	while read f d; do \
> > -		if test -f $(TARGET_DIR)/lib/firmware/$$d; then \
> > -			ln -sf $$d $(TARGET_DIR)/lib/firmware/$$f || exit 1; \
> > +		if test -f $$(readlink -m $$(dirname $$f)/$$d); then \
> > +			mkdir -p $$(dirname $$f) || exit 1; \
> > +			ln -sf $$d $$f || exit 1; \
> >  		fi ; \
> >  	done
> >  endef
> > -- 
> > 2.20.1
> > 
> 
> -- 
> Antoine T?nart, Bootlin
> Embedded Linux and Kernel engineering
> https://bootlin.com

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