netdev - Re: [PATCH bpf-next v2] bpftool: fix build failure

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Date:   Mon, 14 Sep 2020 11:14:49 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Yonghong Song <yhs@...com>
Cc:     bpf <bpf@...r.kernel.org>, Networking <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Kernel Team <kernel-team@...com>,
        Quentin Monnet <quentin@...valent.com>
Subject: Re: [PATCH bpf-next v2] bpftool: fix build failure

On Mon, Sep 14, 2020 at 11:10 AM Yonghong Song <yhs@...com> wrote:
>
> When building bpf selftests like
>   make -C tools/testing/selftests/bpf -j20
> I hit the following errors:
>   ...
>   GEN      /net-next/tools/testing/selftests/bpf/tools/build/bpftool/Documentation/bpftool-gen.8
>   <stdin>:75: (WARNING/2) Block quote ends without a blank line; unexpected unindent.
>   <stdin>:71: (WARNING/2) Literal block ends without a blank line; unexpected unindent.
>   <stdin>:85: (WARNING/2) Literal block ends without a blank line; unexpected unindent.
>   <stdin>:57: (WARNING/2) Block quote ends without a blank line; unexpected unindent.
>   <stdin>:66: (WARNING/2) Literal block ends without a blank line; unexpected unindent.
>   <stdin>:109: (WARNING/2) Literal block ends without a blank line; unexpected unindent.
>   <stdin>:175: (WARNING/2) Literal block ends without a blank line; unexpected unindent.
>   <stdin>:273: (WARNING/2) Literal block ends without a blank line; unexpected unindent.
>   make[1]: *** [/net-next/tools/testing/selftests/bpf/tools/build/bpftool/Documentation/bpftool-perf.8] Error 12
>   make[1]: *** Waiting for unfinished jobs....
>   make[1]: *** [/net-next/tools/testing/selftests/bpf/tools/build/bpftool/Documentation/bpftool-iter.8] Error 12
>   make[1]: *** [/net-next/tools/testing/selftests/bpf/tools/build/bpftool/Documentation/bpftool-struct_ops.8] Error 12
>   ...
>
> I am using:
>   -bash-4.4$ rst2man --version
>   rst2man (Docutils 0.11 [repository], Python 2.7.5, on linux2)
>   -bash-4.4$
>
> The Makefile generated final .rst file (e.g., bpftool-cgroup.rst) looks like
>   ...
>       ID       AttachType      AttachFlags     Name
>   \n SEE ALSO\n========\n\t**bpf**\ (2),\n\t**bpf-helpers**\
>   (7),\n\t**bpftool**\ (8),\n\t**bpftool-btf**\
>   (8),\n\t**bpftool-feature**\ (8),\n\t**bpftool-gen**\
>   (8),\n\t**bpftool-iter**\ (8),\n\t**bpftool-link**\
>   (8),\n\t**bpftool-map**\ (8),\n\t**bpftool-net**\
>   (8),\n\t**bpftool-perf**\ (8),\n\t**bpftool-prog**\
>   (8),\n\t**bpftool-struct_ops**\ (8)\n
>
> The rst2man generated .8 file looks like
> Literal block ends without a blank line; unexpected unindent.
>  .sp
>  n SEEALSOn========nt**bpf**(2),nt**bpf\-helpers**(7),nt**bpftool**(8),nt**bpftool\-btf**(8),nt**
>  bpftool\-feature**(8),nt**bpftool\-gen**(8),nt**bpftool\-iter**(8),nt**bpftool\-link**(8),nt**
>  bpftool\-map**(8),nt**bpftool\-net**(8),nt**bpftool\-perf**(8),nt**bpftool\-prog**(8),nt**
>  bpftool\-struct_ops**(8)n
>
> Looks like that particular version of rst2man prefers to have actual new line
> instead of \n.
>
> Since `echo -e` may not be available in some environment, let us use `printf`.
> Some comments are added in Makefile to warn that '%' is not allowed in bpftool
> man page names.
>
> Cc: Quentin Monnet <quentin@...valent.com>
> Cc: Andrii Nakryiko <andrii.nakryiko@...il.com>
> Fixes: 18841da98100 ("tools: bpftool: Automate generation for "SEE ALSO" sections in man pages")
> Signed-off-by: Yonghong Song <yhs@...com>
> ---
>  tools/bpf/bpftool/Documentation/Makefile | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/tools/bpf/bpftool/Documentation/Makefile b/tools/bpf/bpftool/Documentation/Makefile
> index 4c9dd1e45244..5dd68d79671e 100644
> --- a/tools/bpf/bpftool/Documentation/Makefile
> +++ b/tools/bpf/bpftool/Documentation/Makefile
> @@ -40,11 +40,13 @@ see_also = $(subst " ",, \
>         $(foreach page,$(call list_pages,$(1)),",\n\t**$(page)**\\ (8)") \
>         "\n")
>
> +# using printf for portability as `echo -e` does not work in some
> +# environments. Note that bpftool man page names should not include '%'.
>  $(OUTPUT)%.8: %.rst
>  ifndef RST2MAN_DEP
>         $(error "rst2man not found, but required to generate man pages")
>  endif
> -       $(QUIET_GEN)( cat $< ; echo -n $(call see_also,$<) ) | rst2man $(RST2MAN_OPTS) > $@
> +       $(QUIET_GEN)( cat $< ; printf $(call see_also,$<) ) | rst2man $(RST2MAN_OPTS) > $@

this doesn't have to be in "$(call ...)"?

>
>  clean: helpers-clean
>         $(call QUIET_CLEAN, Documentation)
> --
> 2.24.1
>