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Subject[PATCH 7/8] ktest: Add simple config-bisect frontend
Date
From: Scott Wood <oss@buserror.net>

Add a friendly, git-bisect-like frontend to config-bisect.pl. Unlike
ktest.pl, this frontend requires no configuration beyond specifying
the kernel output directory and (if cross-compiling) $ARCH, and does not
need to run continuously for the entire bisection (and thus can be used
to bisect on the machine testing the kernels).

Signed-off-by: Scott Wood <swood@redhat.com>
---
Is the ktest directory the right place for this, or should it (along with
config-bisect.pl) go elsewhere since it no longer depends on the ktest
infrastructure? If so, where?

tools/testing/ktest/config-bisect.sh | 120 +++++++++++++++++++++++++++++++++++
1 file changed, 120 insertions(+)
create mode 100755 tools/testing/ktest/config-bisect.sh

diff --git a/tools/testing/ktest/config-bisect.sh b/tools/testing/ktest/config-bisect.sh
new file mode 100755
index 000000000000..6032e6736109
--- /dev/null
+++ b/tools/testing/ktest/config-bisect.sh
@@ -0,0 +1,120 @@
+#!/bin/bash
+
+BACKEND=$(dirname $BASH_SOURCE)/config-bisect.pl
+
+usage() {
+ echo Usage:
+ echo "$0 <outputdir> command [args]"
+ echo commands:
+ echo reset
+ echo init
+ echo diff
+ echo bad [conf]
+ echo good [conf]
+ echo skip
+ echo If conf is unspecified, \".config\" is used.
+ echo If cross-compiling, pass the ARCH environment variable.
+}
+
+reset() {
+ rm -rf $STATE
+}
+
+init() {
+ reset
+ mkdir -p $STATE/bad
+ mkdir -p $STATE/good
+ echo 0 > $STATE/good/idx
+ echo 0 > $STATE/bad/idx
+}
+
+next() {
+ if ! [ -d $STATE ]; then
+ echo $0: No config-bisect in progress -- initializing
+ init
+ fi
+
+ IDX=$(cat $STATE/$1/idx)
+ IDX=$(expr $IDX + 1)
+
+ CONF=$2
+ if [ -z "$CONF" ]; then
+ CONF=$O/.config
+ fi
+
+ cp $CONF $STATE/$1/$IDX
+ echo $IDX > $STATE/$1/idx
+}
+
+show_diff() {
+ GI=$(cat $STATE/good/idx)
+ BI=$(cat $STATE/bad/idx)
+
+ if [ $GI != 0 ] && [ $BI != 0 ]; then
+ diff -u $STATE/good/$GI $STATE/bad/$BI
+ else
+ echo $0: cannot diff without at least one good and one bad
+ fi
+}
+
+genconf() {
+ GI=$(cat $STATE/good/idx)
+ BI=$(cat $STATE/bad/idx)
+
+ echo good index $GI, bad index $BI
+
+ if [ $GI != 0 ] && [ $BI != 0 ]; then
+ $BACKEND $O $STATE/good/$GI $STATE/bad/$BI
+
+ case $? in
+ 0)
+ ;;
+ 2)
+ echo Failing config diff:
+ show_diff
+ ;;
+ *)
+ echo $0: error in backend
+ exit 1;
+ ;;
+ esac
+ fi
+}
+
+if [ -z "$1" -o -z "$2" ]; then
+ usage
+ exit 1
+fi
+
+O=$1
+STATE=$O/.config-bisect
+
+case $2 in
+init)
+ init
+ ;;
+reset)
+ reset
+ ;;
+diff)
+ show_diff
+ ;;
+bad)
+ next bad $3
+ genconf
+ ;;
+good)
+ next good $3
+ genconf
+ ;;
+skip)
+ # The options chosen are randomized, so we'll get a different
+ # config just by re-running the config bisect backend with the
+ # same inputs.
+ genconf
+ ;;
+*)
+ usage
+ exit 1
+ ;;
+esac
--
2.9.4
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