perf_counter tools: add in basic glue from Git

First very raw version at having a central 'perf' command and
a list of subcommands:

  perf top
  perf stat
  perf record
  perf report
  ...

This is done by picking up Git's collection of utility functions,
and hacking them to build fine in this new environment.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 42 insertions, 0 deletions

diff --git a/Documentation/perf_counter/PERF-VERSION-GEN b/Documentation/perf_counter/PERF-VERSION-GEN
new file mode 100755
index 000000000000..c561d1538c03
--- /dev/null
+++ b/Documentation/perf_counter/PERF-VERSION-GEN
@@ -0,0 +1,42 @@
+#!/bin/sh
+
+GVF=PERF-VERSION-FILE
+DEF_VER=v0.0.1.PERF
+
+LF='
+'
+
+# First see if there is a version file (included in release tarballs),
+# then try git-describe, then default.
+if test -f version
+then
+        VN=$(cat version) || VN="$DEF_VER"
+elif test -d .git -o -f .git &&
+        VN=$(git describe --abbrev=4 HEAD 2>/dev/null) &&
+        case "$VN" in
+        *$LF*) (exit 1) ;;
+        v[0-9]*)
+                git update-index -q --refresh
+                test -z "$(git diff-index --name-only HEAD --)" ||
+                VN="$VN-dirty" ;;
+        esac
+then
+        VN=$(echo "$VN" | sed -e 's/-/./g');
+else
+        VN="$DEF_VER"
+fi
+
+VN=$(expr "$VN" : v*'\(.*\)')
+
+if test -r $GVF
+then
+        VC=$(sed -e 's/^PERF_VERSION = //' <$GVF)
+else
+        VC=unset
+fi
+test "$VN" = "$VC" || {
+        echo >&2 "PERF_VERSION = $VN"
+        echo "PERF_VERSION = $VN" >$GVF
+}
+
+