From: Masahiro Yamada <masahiroy@kernel.org>
To: John Moon <quic_johmoo@quicinc.com>
Cc: Nathan Chancellor <nathan@kernel.org>,
Nick Desaulniers <ndesaulniers@google.com>,
Nicolas Schier <nicolas@fjasle.eu>,
linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-arm-msm@vger.kernel.org,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Randy Dunlap <rdunlap@infradead.org>,
Arnd Bergmann <arnd@arndb.de>,
Bjorn Andersson <andersson@kernel.org>,
Todd Kjos <tkjos@google.com>,
Matthias Maennich <maennich@google.com>,
Giuliano Procida <gprocida@google.com>,
kernel-team@android.com, libabigail@sourceware.org,
Jordan Crouse <jorcrous@amazon.com>,
Trilok Soni <quic_tsoni@quicinc.com>,
Satya Durga Srinivasu Prabhala <quic_satyap@quicinc.com>,
Elliot Berman <quic_eberman@quicinc.com>,
Guru Das Srinagesh <quic_gurus@quicinc.com>
Subject: Re: [PATCH v4 1/2] check-uapi: Introduce check-uapi.sh
Date: Sat, 8 Apr 2023 04:27:57 +0900 [thread overview]
Message-ID: <CAK7LNATFzdb37ZpOkYOP0rGBBjMhad6p76CXJg7kZsNkhpoBXg@mail.gmail.com> (raw)
In-Reply-To: <20230327174140.8169-2-quic_johmoo@quicinc.com>
On Tue, Mar 28, 2023 at 2:42 AM John Moon <quic_johmoo@quicinc.com> wrote:
>
> While the kernel community has been good at maintaining backwards
> compatibility with kernel UAPIs, it would be helpful to have a tool
> to check if a commit introduces changes that break backwards
> compatibility.
>
> To that end, introduce check-uapi.sh: a simple shell script that
> checks for changes to UAPI headers using libabigail.
>
> libabigail is "a framework which aims at helping developers and
> software distributors to spot some ABI-related issues like interface
> incompatibility in ELF shared libraries by performing a static
> analysis of the ELF binaries at hand."
>
> The script uses one of libabigail's tools, "abidiff", to compile the
> changed header before and after the commit to detect any changes.
>
> abidiff "compares the ABI of two shared libraries in ELF format. It
> emits a meaningful report describing the differences between the two
> ABIs."
>
> The script also includes the ability to check the compatibility of
> all UAPI headers across commits. This allows developers to inspect
> the stability of the UAPIs over time.
>
> Signed-off-by: John Moon <quic_johmoo@quicinc.com>
> ---
> - Refactored to exclusively check headers installed by make
> headers_install. This simplified the code dramatically and removed
> the need to perform complex git diffs.
> - Removed the "-m" flag. Since we're checking all installed headers
> every time, a flag to check only modified files didn't make sense.
> - Added info message when usr/include/Makefile is not present that
> it's likely because that file was only introduced in v5.3.
> - Changed default behavior of log file. Now, the script will not
> create a log file unless you pass "-l <file>".
> - Simplified exit handler.
> - Added -j $MAX_THREADS to make headers_install to improve speed.
> - Cleaned up variable references.
>
> scripts/check-uapi.sh | 488 ++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 488 insertions(+)
> create mode 100755 scripts/check-uapi.sh
>
> +
> +# Install headers for both git refs
> +install_headers() {
> + local -r base_ref="$1"
> + local -r past_ref="$2"
> +
> + DEVIATED_FROM_CURRENT_TREE="false"
> + for ref in "$base_ref" "$past_ref"; do
> + if [ -n "$ref" ]; then
> + if [ "$DEVIATED_FROM_CURRENT_TREE" = "false" ]; then
> + save_tree_state
> + DEVIATED_FROM_CURRENT_TREE="true"
> + fi
> + # This script ($0) is already loaded into memory at this point,
> + # so this operation is safe
> + git checkout --quiet "$(git rev-parse "$ref")"
> + fi
> +
> + printf "Installing sanitized UAPI headers from %s... " "${ref:-dirty tree}"
> + make -j "$MAX_THREADS" ARCH="$ARCH" INSTALL_HDR_PATH="${TMP_DIR}/${ref}/usr" headers_install > /dev/null 2>&1
You suppressed stderr.
If 'make headers_install' fails, users see a sudden death
with no clue.
--
Best Regards
Masahiro Yamada
next prev parent reply other threads:[~2023-04-07 19:28 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-27 17:41 [PATCH v4 0/2] Validating UAPI backwards compatibility John Moon
2023-03-27 17:41 ` [PATCH v4 1/2] check-uapi: Introduce check-uapi.sh John Moon
2023-04-03 19:53 ` John Moon
2023-04-07 19:19 ` Masahiro Yamada
2023-04-07 20:08 ` John Moon
2023-04-07 19:27 ` Masahiro Yamada [this message]
2023-04-07 20:09 ` John Moon
2023-03-27 17:41 ` [PATCH v4 2/2] docs: dev-tools: Add UAPI checker documentation John Moon
2023-03-28 18:10 ` Nick Desaulniers
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