[Buildroot] [PATCH v2 07/14] package/systemd: fixup RPATH for more systemd host binaries

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

Norbert, All,

On 2020-06-15 09:20 +0200, Norbert Lange spake thusly:
> All systemd binaries depend on libsystemd-shared and need their
> RPATH fixed. Use a glob to catch them all
> 
> Signed-off-by: Norbert Lange <nolange79@gmail.com>
> ---
>  package/systemd/systemd.mk | 17 +++++------------
>  1 file changed, 5 insertions(+), 12 deletions(-)
> 
> diff --git a/package/systemd/systemd.mk b/package/systemd/systemd.mk
> index 2cc71ee667..2c7f35bf25 100644
> --- a/package/systemd/systemd.mk
> +++ b/package/systemd/systemd.mk
> @@ -659,6 +659,8 @@ HOST_SYSTEMD_DEPENDENCIES = \
>  	host-libcap \
>  	host-gperf
>  
> +HOST_SYSTEMD_NINJA_ENV = DESTDIR=$(HOST_DIR)
> +
>  # Fix RPATH After installation
>  # * systemd provides a install_rpath instruction to meson because the binaries
>  #   need to link with libsystemd which is not in a standard path
> @@ -667,20 +669,11 @@ HOST_SYSTEMD_DEPENDENCIES = \
>  # * the original path had been tweaked by buildroot via LDFLAGS to add
>  #   $(HOST_DIR)/lib
>  # * thus re-tweak rpath after the installation for all binaries that need it
> -HOST_SYSTEMD_HOST_TOOLS = \
> -	systemd-analyze \
> -	systemd-machine-id-setup \
> -	systemd-mount \
> -	systemd-nspawn \
> -	systemctl \
> -	udevadm
> -
> -HOST_SYSTEMD_NINJA_ENV = DESTDIR=$(HOST_DIR)
>  
>  define HOST_SYSTEMD_FIX_RPATH
> -	$(foreach f,$(HOST_SYSTEMD_HOST_TOOLS), \
> -		$(HOST_DIR)/bin/patchelf --set-rpath $(HOST_DIR)/lib:$(HOST_DIR)/lib/systemd $(HOST_DIR)/bin/$(f)
> -	)
> +	cd $(HOST_DIR)/bin && for f in journalctl systemctl udevadm systemd-*; do \
> +	  [ ! -x $$f ] || $(HOST_DIR)/bin/patchelf --set-rpath $(HOST_DIR)/lib:$(HOST_DIR)/lib/systemd $$f; \
> +	  done

You fell in the usual trap: if patchelf fails, then the error is not
caught, and the loop continues and ends succesfully, while in fact there
was an error...

There are two solutions to fix that:

  - with the loop implemented in shell, terminate the command in the
    loop with:  || exit 1

      $(HOST_DIR)/bin/patchelf [...] $$f || exit 1;

  - keep the loop implemented in Makefile:

    HOST_SYSTEMD_HOST_TOOLS = $(wildcard $(addprefix $(HOST_DIR)/bin,journalctl systemctl udevadm systemd-*))
    $(foreach f,$(HOST_SYSTEMD_HOST_TOOLS), \
        $(HOST_DIR)/bin/patchelf --set-rpath $(HOST_DIR)/lib:$(HOST_DIR)/lib/systemd $(HOST_DIR)/bin/$(f)
    )

Needless to say that we tend to prefer the second solution.

Regards,
Yann E. MORIN.

>  endef
>  HOST_SYSTEMD_POST_INSTALL_HOOKS += HOST_SYSTEMD_FIX_RPATH
>  
> -- 
> 2.27.0
> 

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