[Buildroot] [PATCH 1/1] skeleton: ensure that /usr/{lib, bin, sbin} exist

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

Danomi, All,

On 2017-01-04 22:55 -0500, Danomi Manchego spake thusly:
> It is possible to have a custom skeleton without a /usr/{lib,bin,sbin},
> and indeed without a /usr directory at all.  These directories eventually
> get created when packages install there, but at skeleton installation time,
> the following command fails if /usr does not yet exist:
> 
> ln -snf lib $(TARGET_DIR)/usr/$(SKELETON_LIB_SYMLINK)
> 
> So, in the spirit of ensuring that directories exist before installing there,
> ensure that at least /usr exists to avoid the above failure.  While doing
> so, lets ensure that /usr/{lib,bin,sbin} exist too, to be thematically
> consistent with SKELETON_USR_SYMLINKS_OR_DIRS.
> 
> Signed-off-by: Danomi Manchego <danomimanchego123@gmail.com>

NAK. Our stance is that, when using a custom skeleton, the user is
responsible for providing a correct skeleton. For example, we check
for the merged-usr consistency on lines 36-57, so this means that bin
sbin and lib should already exist.

So, instead of crating those directories, we should check they do exist.

Just for your information, I've been working on a series that reworks
our handling of skeletons:
    https://git.buildroot.org/~ymorin/git/buildroot/log/?h=yem/systemd-skeleton
and the pending rewrite to accomodate for requested changes:
    https://git.buildroot.org/~ymorin/git/buildroot/log/?h=yem/systemd-skeleton-2

In this series (which was basically approved on the principles), the
custom skeleton is now checking that those dirs exists:
    https://git.buildroot.org/~ymorin/git/buildroot/tree/package/skeleton-custom/skeleton-custom.mk?h=yem/systemd-skeleton&id=5a9b164a32e888b713d9aad911313c27fbb5052f

Regards,
Yann E. MORIN.

> ---
>  package/skeleton/skeleton.mk | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/package/skeleton/skeleton.mk b/package/skeleton/skeleton.mk
> index 1000161..4b661fe 100644
> --- a/package/skeleton/skeleton.mk
> +++ b/package/skeleton/skeleton.mk
> @@ -91,6 +91,9 @@ define SKELETON_INSTALL_TARGET_CMDS
>  	rsync -a --ignore-times $(RSYNC_VCS_EXCLUSIONS) \
>  		--chmod=u=rwX,go=rX --exclude .empty --exclude '*~' \
>  		$(SKELETON_PATH)/ $(TARGET_DIR)/
> +	$(INSTALL) -d -m 0755 $(TARGET_DIR)/usr/lib
> +	$(INSTALL) -d -m 0755 $(TARGET_DIR)/usr/bin
> +	$(INSTALL) -d -m 0755 $(TARGET_DIR)/usr/sbin
>  	$(call SKELETON_USR_SYMLINKS_OR_DIRS,$(TARGET_DIR))
>  	ln -snf lib $(TARGET_DIR)/$(SKELETON_LIB_SYMLINK)
>  	ln -snf lib $(TARGET_DIR)/usr/$(SKELETON_LIB_SYMLINK)
> -- 
> 1.9.1
> 
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