netdev - Re: [PATCH v3 bpf-next] libbpf: make libbpf.map source of truth for libbpf version

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Date:   Wed, 14 Aug 2019 21:33:37 +0000
From:   Andrey Ignatov <rdna@...com>
To:     Andrii Nakryiko <andriin@...com>
CC:     "bpf@...r.kernel.org" <bpf@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...com>,
        "daniel@...earbox.net" <daniel@...earbox.net>,
        "andrii.nakryiko@...il.com" <andrii.nakryiko@...il.com>,
        Kernel Team <Kernel-team@...com>
Subject: Re: [PATCH v3 bpf-next] libbpf: make libbpf.map source of truth for
 libbpf version

Andrii Nakryiko <andriin@...com> [Wed, 2019-08-14 13:57 -0700]:
> Currently libbpf version is specified in 2 places: libbpf.map and
> Makefile. They easily get out of sync and it's very easy to update one,
> but forget to update another one. In addition, Github projection of
> libbpf has to maintain its own version which has to be remembered to be
> kept in sync manually, which is very error-prone approach.
> 
> This patch makes libbpf.map a source of truth for libbpf version and
> uses shell invocation to parse out correct full and major libbpf version
> to use during build. Now we need to make sure that once new release
> cycle starts, we need to add (initially) empty section to libbpf.map
> with correct latest version.
> 
> This also will make it possible to keep Github projection consistent
> with kernel sources version of libbpf by adopting similar parsing of
> version from libbpf.map.
> 
> v2->v3:
> - grep -o + sort -rV (Andrey);
> 
> v1->v2:
> - eager version vars evaluation (Jakub);
> - simplified version regex (Andrey);

Acked-by: Andrey Ignatov <rdna@...com>


> Cc: Andrey Ignatov <rdna@...com>
> Signed-off-by: Andrii Nakryiko <andriin@...com>
> ---
>  tools/lib/bpf/Makefile   | 20 ++++++++------------
>  tools/lib/bpf/libbpf.map |  3 +++
>  2 files changed, 11 insertions(+), 12 deletions(-)
> 
> diff --git a/tools/lib/bpf/Makefile b/tools/lib/bpf/Makefile
> index 9312066a1ae3..148a27164189 100644
> --- a/tools/lib/bpf/Makefile
> +++ b/tools/lib/bpf/Makefile
> @@ -1,9 +1,10 @@
>  # SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
>  # Most of this file is copied from tools/lib/traceevent/Makefile
>  
> -BPF_VERSION = 0
> -BPF_PATCHLEVEL = 0
> -BPF_EXTRAVERSION = 4
> +LIBBPF_VERSION := $(shell \
> +	grep -oE '^LIBBPF_([0-9.]+)' libbpf.map | \
> +	sort -rV | head -n1 | cut -d'_' -f2)
> +LIBBPF_MAJOR_VERSION := $(firstword $(subst ., ,$(LIBBPF_VERSION)))
>  
>  MAKEFLAGS += --no-print-directory
>  
> @@ -79,15 +80,9 @@ export prefix libdir src obj
>  libdir_SQ = $(subst ','\'',$(libdir))
>  libdir_relative_SQ = $(subst ','\'',$(libdir_relative))
>  
> -VERSION		= $(BPF_VERSION)
> -PATCHLEVEL	= $(BPF_PATCHLEVEL)
> -EXTRAVERSION	= $(BPF_EXTRAVERSION)
> -
>  OBJ		= $@
>  N		=
>  
> -LIBBPF_VERSION	= $(BPF_VERSION).$(BPF_PATCHLEVEL).$(BPF_EXTRAVERSION)
> -
>  LIB_TARGET	= libbpf.a libbpf.so.$(LIBBPF_VERSION)
>  LIB_FILE	= libbpf.a libbpf.so*
>  PC_FILE		= libbpf.pc
> @@ -178,10 +173,10 @@ $(BPF_IN): force elfdep bpfdep
>  $(OUTPUT)libbpf.so: $(OUTPUT)libbpf.so.$(LIBBPF_VERSION)
>  
>  $(OUTPUT)libbpf.so.$(LIBBPF_VERSION): $(BPF_IN)
> -	$(QUIET_LINK)$(CC) --shared -Wl,-soname,libbpf.so.$(VERSION) \
> +	$(QUIET_LINK)$(CC) --shared -Wl,-soname,libbpf.so.$(LIBBPF_MAJOR_VERSION) \
>  				    -Wl,--version-script=$(VERSION_SCRIPT) $^ -lelf -o $@
>  	@ln -sf $(@F) $(OUTPUT)libbpf.so
> -	@ln -sf $(@F) $(OUTPUT)libbpf.so.$(VERSION)
> +	@ln -sf $(@F) $(OUTPUT)libbpf.so.$(LIBBPF_MAJOR_VERSION)
>  
>  $(OUTPUT)libbpf.a: $(BPF_IN)
>  	$(QUIET_LINK)$(RM) $@; $(AR) rcs $@ $^
> @@ -257,7 +252,8 @@ config-clean:
>  
>  clean:
>  	$(call QUIET_CLEAN, libbpf) $(RM) $(TARGETS) $(CXX_TEST_TARGET) \
> -		*.o *~ *.a *.so *.so.$(VERSION) .*.d .*.cmd *.pc LIBBPF-CFLAGS
> +		*.o *~ *.a *.so *.so.$(LIBBPF_MAJOR_VERSION) .*.d .*.cmd \
> +		*.pc LIBBPF-CFLAGS
>  	$(call QUIET_CLEAN, core-gen) $(RM) $(OUTPUT)FEATURE-DUMP.libbpf
>  
>  
> diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map
> index f9d316e873d8..4e72df8e98ba 100644
> --- a/tools/lib/bpf/libbpf.map
> +++ b/tools/lib/bpf/libbpf.map
> @@ -184,3 +184,6 @@ LIBBPF_0.0.4 {
>  		perf_buffer__new_raw;
>  		perf_buffer__poll;
>  } LIBBPF_0.0.3;
> +
> +LIBBPF_0.0.5 {
> +} LIBBPF_0.0.4;
> -- 
> 2.17.1
> 

-- 
Andrey Ignatov