linux-kernel - [PATCH] perf tools: Fix empty version number when building outside of a git repo

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Date:   Tue, 27 Sep 2022 15:52:28 -0400
From:   Will Chandler <wfc@...handler.org>
To:     peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
        mark.rutland@....com, alexander.shishkin@...ux.intel.com,
        jolsa@...nel.org, namhyung@...nel.org,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     john.garry@...wei.com, wfc@...handler.org
Subject: [PATCH] perf tools: Fix empty version number when building outside of a git repo

When perf is built in a full source tree that is not a git repository,
e.g. from a kernel source tarball, `perf version` will print empty tag
and commit strings:

  $ perf version
  perf version

Currently the tag version is only generated from the root Makefile when
building in a git repository. If PERF-VERSION-FILE has not been
generated and the source tree is not in a git repository, then
PERF-VERSION-GEN will return an empty version.

The problem can be reproduced with the following steps:

  $ wget https://git.kernel.org/torvalds/t/linux-6.0-rc7.tar.gz
  $ tar -xf linux-6.0-rc7.tar.gz && cd linux-6.0-rc7
  $ make -C tools/perf
  $ tools/perf/perf -v
  perf version

Builds from tarballs generated with `make perf-tar-src-pkg` are not
impacted by this issue as PERF-VERSION-FILE is included in the archive.

The perf RPM provided by Fedora for 5.18+ is experiencing this problem.
Package build logs[0] show that the build is attempting to fall back on
PERF-VERSION-FILE, but it is not present.

To resolve this, always use the tag from the root Makefile if available.

[0] https://kojipkgs.fedoraproject.org/packages/kernel-tools/5.19.4/200.fc36/data/logs/x86_64/build.log

Fixes: 7572733b8499 ("perf tools: Fix version kernel tag, 2022-02-21")
Signed-off-by: Will Chandler <wfc@...handler.org>
---
 tools/perf/util/PERF-VERSION-GEN | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/PERF-VERSION-GEN b/tools/perf/util/PERF-VERSION-GEN
index 0ee5af529238..43b8a8ea6f53 100755
--- a/tools/perf/util/PERF-VERSION-GEN
+++ b/tools/perf/util/PERF-VERSION-GEN
@@ -15,10 +15,13 @@ LF='
 #
 CID=
 TAG=
-if test -d ../../.git -o -f ../../.git
+if test -r ../../Makefile
 then
 	TAG=$(MAKEFLAGS= make -sC ../.. kernelversion)
-	CID=$(git log -1 --abbrev=12 --pretty=format:"%h" 2>/dev/null) && CID="-g$CID"
+	if test -d ../../.git -o -f ../../.git
+	then
+	    CID=$(git log -1 --abbrev=12 --pretty=format:"%h" 2>/dev/null) && CID="-g$CID"
+	fi
 else
 	TAG=$(cut -d' ' -f3 ../../PERF-VERSION-FILE | sed -e 's/\"//g')
 fi
-- 
2.37.3