netdev - Re: [PATCH bpf-next] libbpf: emit diff of mismatched public API, if any

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Message-ID: <CAEf4BzbdNv-azRNQpyH91-Ms59Uw7-990Dadix-_t851pXRRLQ@mail.gmail.com>
Date:   Wed, 22 May 2019 10:44:51 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Alexei Starovoitov <ast@...com>
Cc:     Andrii Nakryiko <andriin@...com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "bpf@...r.kernel.org" <bpf@...r.kernel.org>,
        "daniel@...earbox.net" <daniel@...earbox.net>
Subject: Re: [PATCH bpf-next] libbpf: emit diff of mismatched public API, if any

On Wed, May 22, 2019 at 9:21 AM Alexei Starovoitov <ast@...com> wrote:
>
> On 5/22/19 9:15 AM, Andrii Nakryiko wrote:
> > It's easy to have a mismatch of "intended to be public" vs really
> > exposed API functions. While Makefile does check for this mismatch, if
> > it actually occurs it's not trivial to determine which functions are
> > accidentally exposed. This patch dumps out a diff showing what's not
> > supposed to be exposed facilitating easier fixing.
> >
> > Signed-off-by: Andrii Nakryiko <andriin@...com>
> > ---
> >   tools/lib/bpf/.gitignore | 2 ++
> >   tools/lib/bpf/Makefile   | 8 ++++++++
> >   2 files changed, 10 insertions(+)
> >
> > diff --git a/tools/lib/bpf/.gitignore b/tools/lib/bpf/.gitignore
> > index d9e9dec04605..c7306e858e2e 100644
> > --- a/tools/lib/bpf/.gitignore
> > +++ b/tools/lib/bpf/.gitignore
> > @@ -3,3 +3,5 @@ libbpf.pc
> >   FEATURE-DUMP.libbpf
> >   test_libbpf
> >   libbpf.so.*
> > +libbpf_global_syms.tmp
> > +libbpf_versioned_syms.tmp
> > diff --git a/tools/lib/bpf/Makefile b/tools/lib/bpf/Makefile
> > index f91639bf5650..7e7d6d851713 100644
> > --- a/tools/lib/bpf/Makefile
> > +++ b/tools/lib/bpf/Makefile
> > @@ -204,6 +204,14 @@ check_abi: $(OUTPUT)libbpf.so
> >                    "versioned symbols in $^ ($(VERSIONED_SYM_COUNT))." \
> >                    "Please make sure all LIBBPF_API symbols are"       \
> >                    "versioned in $(VERSION_SCRIPT)." >&2;              \
> > +             readelf -s --wide $(OUTPUT)libbpf-in.o |                 \
> > +                 awk '/GLOBAL/ && /DEFAULT/ && !/UND/ {print $$8}'|   \
> > +                 sort -u > $(OUTPUT)libbpf_global_syms.tmp;           \
> > +             readelf -s --wide $(OUTPUT)libbpf.so |                   \
> > +                 grep -Eo '[^ ]+@...BPF_' | cut -d@ -f1 |             \
> > +                 sort -u > $(OUTPUT)libbpf_versioned_syms.tmp;        \
> > +             diff -u $(OUTPUT)libbpf_global_syms.tmp                  \
> > +                  $(OUTPUT)libbpf_versioned_syms.tmp;                 \
> >               exit 1;                                                  \
>
> good idea.
> how about removing tmp files instead of adding them to .gitignore?

ok, will remove them