[Buildroot] [PATCH] support/download: protect from custom commands with spaces in args

[Andi Shyti <andi.shyti@gmail.com>]

Hi Yann,

> > > Some users may provide custom download commands with spaces
> > > in their
> > > arguments, like so:
> > >     BR2_HG="hg --config foo.bar='some space-separated
> > >     value'"
> >
> > this patch is breaking the build. With configs like this:
> >
> > BR2_LINUX_KERNEL=y
> > BR2_LINUX_KERNEL_CUSTOM_GIT=y
> > BR2_LINUX_KERNEL_CUSTOM_REPO_URL="git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git"
> > BR2_LINUX_KERNEL_DEFCONFIG="exynos"
> > BR2_LINUX_KERNEL_DTS_SUPPORT=y
> > BR2_LINUX_KERNEL_INTREE_DTS_NAME="exynos5422-odroidxu4"
>
> You forgot to specify a kernel version here, which is the
> ultimate
> reason for the failure.
>
> It does not make sense to use a git tree without specifying
> either a tag
> or a sha1 to checkout.

actually I haven't forgotten, but I normally expect to clone
master out of a git clone without having specified any
branch/sha1/tag (the way it was working before).

Indeed, by setting

BR2_LINUX_KERNEL_CUSTOM_REPO_VERSION="master"

it worked.

> > the command sent is:
> >
> > git clone --mirror
> > 'git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git'
> > ''
> >
> > git dosn't like empty strngs and provides this output:
> >
> > fatal: The empty string is not a valid path
> >
> > Besides, I have never seen spaces in branch name,
> > repositories
> > names and it is quite a corner case. I think this patch
> > should be
> > reverted (at least) in the case of git.
>
> No, the patch is correct. What we should however check is that
> the
> version string is not empty, and bail out on that error
> instead.
>
> Somehow, when the user forgets to specify a version string, we
> call the
> download scripts with no basename, and the empty string you see
> in the
> git call above should have been the basename of the directory
> to clone
> into, i.e. something like:  linux-VERSION/

I think that buildroot should not fail if the version is not
specified, but go ahead with a default solution, which can be
master.

Something like this, perhaps?

 linux/linux.mk | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/linux/linux.mk b/linux/linux.mk
index 3c53a0b..61f7468 100644
--- a/linux/linux.mk
+++ b/linux/linux.mk
@@ -20,6 +20,11 @@ LINUX_SITE_METHOD = local
 else ifeq ($(BR2_LINUX_KERNEL_CUSTOM_GIT),y)
 LINUX_SITE = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_REPO_URL))
 LINUX_SITE_METHOD = git
+
+ifeq ($(strip $(LINUX_VERSION)),)
+LINUX_VERSION = "master"
+endif
+
 else ifeq ($(BR2_LINUX_KERNEL_CUSTOM_HG),y)
 LINUX_SITE = $(call qstrip,$(BR2_LINUX_KERNEL_CUSTOM_REPO_URL))
 LINUX_SITE_METHOD = hg

Thanks,
Andi