[PATCH] perf tools: Fix perf version generation

[Robert Richter <rric@kernel.org>]

From: Robert Richter <robert.richter@calxeda.com>

The tag of the perf version is wrongly determined, always the latest
tag is taken regardless of the HEAD commit:

 $ perf --version
 perf version 3.9.rc8.gd7f5d3
 $ git describe d7f5d3
 v3.9-rc7-154-gd7f5d33
 $ head -n 4 Makefile
 VERSION = 3
 PATCHLEVEL = 9
 SUBLEVEL = 0
 EXTRAVERSION = -rc7

In other cases no tag might be found.

This patch fixes this.

This new implementation handles also the case if there are no tags at
all found in the git repo but there is a commit id.

Signed-off-by: Robert Richter <robert.richter@calxeda.com>
---
 tools/perf/util/PERF-VERSION-GEN | 21 +++++++++++++++------
 1 file changed, 15 insertions(+), 6 deletions(-)

diff --git a/tools/perf/util/PERF-VERSION-GEN b/tools/perf/util/PERF-VERSION-GEN
index 055fef3..15a77b7 100755
--- a/tools/perf/util/PERF-VERSION-GEN
+++ b/tools/perf/util/PERF-VERSION-GEN
@@ -13,13 +13,22 @@ LF='
 # First check if there is a .git to get the version from git describe
 # otherwise try to get the version from the kernel Makefile
 #
-if test -d ../../.git -o -f ../../.git &&
-	VN=$(git tag 2>/dev/null | tail -1 | grep -E "v[0-9].[0-9]*")
+CID=
+TAG=
+if test -d ../../.git -o -f ../../.git
 then
-	VN=$(echo $VN"-g"$(git log -1 --abbrev=4 --pretty=format:"%h" HEAD))
-	VN=$(echo "$VN" | sed -e 's/-/./g');
-else
-	VN=$(MAKEFLAGS= make -sC ../.. kernelversion)
+	TAG=$(git describe --abbrev=0 --match "v[0-9].[0-9]*" 2>/dev/null )
+	CID=$(git log -1 --abbrev=4 --pretty=format:"%h" 2>/dev/null) && CID="-g$CID"
+fi
+if test -z "$TAG"
+then
+	TAG=$(MAKEFLAGS= make -sC ../.. kernelversion)
+fi
+VN="$TAG$CID"
+if test -n "$CID"
+then
+	# format version string, strip trailing zero of sublevel:
+	VN=$(echo "$VN" | sed -e 's/-/./g;s/\([0-9]*[.][0-9]*\)[.]0/\1/')
 fi
 
 VN=$(expr "$VN" : v*'\(.*\)')
-- 
1.8.1.1